137results about How to "Reduce operating torque" patented technology

In a sealing device for a bearing, a sub-seal lip is configured such that a slide contact surface is formed like an annular band. As the rotation speed of the bearing increases, the width of the slide contact surface is reduced by a centrifugal force. Thus, sliding friction can effectively be minimized. The torque of the bearing can be prevented from increasing at high-speed rotation. Even when the centrifugal force increases somewhat, only reduction in the width of the slide contact surface is caused. Thus, a slide-contacted state can be maintained. Consequently, the problem of floating-up of the sub-seal lip from a slinger is difficult to occur.

In a tapered roller bearing, LWR / DW is in the range of 1.1 to 1.7 where LWR represents a roller effective length of tapered rollers and DW represents a roller mean diameter of tapered rollers. RCO / LRO is 30 to 150, and RCI / LRI is 50 to 260 where RCO represents a crowning radius of an outer ring, LRO represents a raceway length of the outer ring, RCI represents a crowning radius of an inner ring and LRI represents a raceway length of the inner ring. The following expressions are satisfied: 20°≦α≦30°, and α−0.87γ−0.334≦BK≦α−0.87γ−0.167, where α represents a raceway angle of the outer ring, γ represents a roller angle of the tapered rollers, and BK represents a rib angle of a large rib portion of the inner ring.

A compressor device for a refrigerant cycle includes a compressor and a control unit. The compressor is provided with a displacement changing mechanism for changing its displacement. The control unit changes a current value supplied to the displacement changing mechanism, thereby relatively changing the displacement of the compressor. In the compressor device, when a rotational speed of a vehicle engine is lower than a predetermined rotational speed, the control unit controls an upper limit of the current value between a first predetermined value and a maximum value. Accordingly, a displacement specification of the compressor device can be normalized for vehicle engines having different power outputs, while engine stall can be prevented.

The invention discloses a metal hard seal ball valve, which comprises a valve body, a valve cover, a valve ball, valve seats, a valve rod, a bracket and a drive device, wherein the valve body and the valve cover are connected to form a cavity, the valve ball provided with a through hole is positioned in the cavity, the upper end of the valve ball is connected with the valve rod, two sides of the valve ball are provided with the valve seats respectively, the bracket is fixedly connected with the valve body through bolts, the drive device is connected with a valve rod shaft through the bracket, the valve seats are made of a metal material, and a sealing gasket, a pressure ring and a belleville spring are arranged between the valve base and the valve body in turn. The metal hard seal ball valve adopts a metal-metal dual sealing mode between the valve body and the valve seats, between the valve cover and the valve seats, and between the valve seats and the valve ball to greatly improve the sealability, and can be applied to a working condition at a temperature of more than 500 DEG C; besides, by spraying a hard alloy or a hardened material on the surfaces of the valve seats and the valve ball, the metal hard seal ball valve has necessary precision and hardness for sealing, and the specially manufactured elastic valve seats and the belleville spring have quite low operating torques.

A tapered roller bearing according to the invention is such that when an arithmetical mean roughness as a surface roughness of a large end face of a tapered roller is σ1 and an arithmetical mean roughness as a surface roughness of a large rib surface of an inner ring is σ2, σ1 is 0.04 μm or larger, anda composite roughness that is expressed by a square root of a sum of a squared value of σ1 and a squared value of σ2 is 0.17 μm or smaller. Raceway surfaces of an outer ring and the inner ring and a rolling contact surface of the tapered roller are crowned, and a total crowning amount is set to 50 μm or larger, an outer ring crowning rate is set to 40% or larger, and a roller crowning rate is set to 20% or smaller.

In a wheel supporting rolling bearing unit, an inner end opening out of both end openings of a space in which balls 14, 14 are provided is sealed with a cap 17a. An outer end opening is sealed with a seal ring 16c having three seal lips. A rolling resistance that changes based on a preload is regulated in a range of 0.15 to 0.45 N·m, and a running resistance of the seal ring 16c based on a friction between the seal ring and a counter surface is regulated in a range of 0.03 to 0.2 N·m.

The invention relates to a floating shaft lever sealing structure, comprising a shat lever, a gland, a shell cover, a floating ring, a shaft sleeve and a seal ring; wherein the gland and the shell cover are both sheathed on the shaft lever, the gland is fixed on the cover by virtue of a bolt, the lower surface of the gland is provided with a circle of bosses, the inner wall of the shell cover is provided with a step, the step is arranged below the boss, the floating ring is in a cylinder shape, the middle of the outer wall of the floating ring is provided with a circle of flanges, the flanges are compressed and arranged between the gland and the shell cover, the shaft sleeve is sheathed on the shaft lever, the outer wall thereof is bonded with the inner wall of the floating ring, the inner wall of the shaft sleeve is provided with a seal groove, and the seal ring is arranged in the seal groove. According to the structure, the effects that valve operating torque is reduced and daily maintenance is avoided are achieved, vibration and deflection of the shaft lever are absorbed by the floating ring, the shaft sleeve for placing the seal ring synchronously moves along with the shaft lever, the operation of the seal ring is not influenced by vibration and deflection of the shaft lever, and the effects that seal leakage is avoided and service life is prolonged are achieved.

The invention discloses a two-way hard sealing butterfly valve with a movable valve seat. The two-way hard sealing butterfly valve comprises a valve body, the valve seat, a butterfly plate, a hand wheel, a worm gear case, a key and a valve shaft. The butterfly plate is fixedly connected with a press plate through a press plate screw. A butterfly plate seal ring is arranged between the press plate and the butterfly plate. The valve seat is arranged between the butterfly plate seal ring and the valve body. The valve seat comprises a horizontally reversely extended clamping part and a support arm part. The matching part between the clamping part and the top of the butterfly plate seal ring is a slope. The support arm part comprises a first support arm and a second support arm, wherein the first support arm and the second support arm are arranged in parallel in a spaced mode. The inner side wall of the valve body is fixedly connected with a pressing sleeve which extends horizontally to the support arm part. The tail end of the pressing sleeve is provided with a groove. A compressed spring set which is arranged horizontally is arranged in the groove. The tail end of the first support arm is arranged in the groove in a matching mode and makes contact with the compressed spring set. The two-way hard sealing butterfly valve has the advantages that the valve seat is horizontally positioned at many positions, and therefore the valve seat will not tilt in the moving process; as a plurality of O-type rings are arranged, the compressed spring set operates in a clean environment, and service life is long; the compressed spring set composed of a plurality of compressed springs is adopted, so that production cost is lowered; an exhaust cap and the movable valve seat allow the operation torque of the butterfly plate to be low.

This invention relates to a valve, which comprises main valve with upper and down holes, valve petal, valve bar and handle wheel fixed or electric device and assistant structure. It is characterized by the following: the said valve bar comprises main axis and assistant axis; the valve bar main axis is located with one bias wheel and one guiding valve with hole on one side of the assistant axis; the guiding valve is located with one guiding valve. Due to the guiding valve, the whole valve shall not contact with sealed ring during rotation process to avoid friction force.

The difference between a revolution period of larger diameter-side balls and a revolution period of smaller diameter-side balls is smaller as compared with a conventional bearing. The relation, (β−10)≦α<β, is established, where α(°) represents a contact angle of the larger diameter-side ball, and β(°) represents a contact angle of the smaller diameter-side ball.

The invention relates to the technical field of valves, and discloses a self-sealing gate valve structure. The self-sealing gate valve structure comprises a valve body, a valve cavity and a valve rod, wherein a left valve seat and a right valve seat which are coaxial are arranged at the inner ends of a left passage and a right passage respectively; a gate seat fixed with the valve rod is arranged between the left valve seat and the right valve seat; a left gate and a right gate are respectively arranged on the two sides of the gate seat; the inner end of the left gate extends to form an outer connecting sleeve; the inner end of the right gate extends to form an inner connecting sleeve; the inner connecting sleeve and the outer connecting sleeve are connected in a sliding manner; the outer connecting sleeve is in clearance fit with a connection hole in the gate seat; and a closed liquid storage cavity is formed between the inner connecting sleeve and the outer connecting sleeve and filled with oil. The self-sealing gate valve structure has the benefits of being good in sealing effect, small in operation torque and anti-locking.

The invention relates to a planet pin roller spiral device, a manufacturing method and a forced seal ball valve. The planet pin roller spiral device comprises a stud component provided with a stud anda screw hole component provided with a screw hole. A plurality of planet pin rollers are arranged between the stud and the screw hole and arranged between the stud and the screw hole through a retainer. A thread rail replacing groove is formed in the stud in the axial direction, and a top protrusion is arranged at the end of the thread rail replacing groove. An assembling method comprises the steps that a filling-in block is pressed on a leaf spring through a fastening screw via a hot melting gasket, and the leaf spring is compressed towards the bottom face of the thread rail replacing groove; and after the screw hole component is screwed in place, the thread rail replacing groove and the top protrusion part of the stud component are heated, and the filling-in block is elevated under theaction of the leaf spring. The planet pin roller spiral device, the manufacturing method and the forced seal ball valve have the beneficial effects that the friction force in the thread drive processcan be obviously reduced, the operation torque during valve opening and closing is reduced, and the working life of the forced seal ball valve is prolonged.

The invention discloses an exhaust butterfly valve for auxiliary braking of an automobile. The exhaust butterfly valve for auxiliary braking of the automobile comprises a valve body, a valve rod, a valve plate and a power mechanism, wherein the valve plate is fixedly arranged in an inner cavity of the valve body through the valve rod, the valve plate is connected with the power mechanism, the power mechanism drives the valve plate to overturn in the inner cavity by using the valve rod as a rotary axis, when the valve plate is closed, the inner cavity is divided into a gas inlet cavity and an exhaust cavity by the valve plate, the valve plate is in bilateral symmetry and longitudinal symmetry, the axis of the valve rod deviates from the bilateral symmetry axis of the valve plate so that one surface, facing the gas inlet cavity, of the valve plate can be divided into a pressure surface I and a pressure surface II by the longitudinal plane of the axis, and the pressure surface I and the pressure surface II are different in size. According to the exhaust butterfly valve for auxiliary braking of the automobile, due to the fact that the valve plate and the valve rod are eccentrically installed, the surface, facing the gas inlet cavity, of the valve plate is divided into the pressure surface I and the pressure surface II, the pressure surface I and the pressure surface II are different in size, reset force of the exhaust butterfly valve in the process of removing exhaust braking is increased through the pressure difference between the two pressure surfaces, operating torque can be reduced when the valve plate is open, the energy loss of an engine is reduced, flexibility of opening of the valve plate is ensured, and normal operation of the exhaust braking function of the engine is ensured.

The invention belongs to the valve technological area. In detail it is an elastic-seated sealing gate valve, comprising valve body, valve board, valve bar, valve cover, handle and fastener. O-shaped sealing ring, O-shaped sealing ring, thrust bearing, nylon ring and O-shaped sealing ring. On the valve core of valve board a rectangle hole is set, embedded by rectangle copper nut for connecting valve bar and valve board. Inner and outer of valve core of valve board are coated with rubber and the bottom of valve body is flat. The leakage phenomena is decreased widely in the invention meanwhile operation torque is decreased and reduced by adding thrust bearing and nylon ring. There is no groove at the bottom of the valve body so that the sundries are not filled up to hinder the valve door close. The connector between nut and valve board is designed in embedded style so that damaged parts is replaced expediently in repairing.

The invention discloses a ball valve. The ball valve comprises a valve body; a channel and a mounting hole are formed in the valve body; an upper end cover is mounted at the upper end of the mountinghole of the valve body; a lower end cover is mounted at the lower end of the mounting hole of the valve body; the lower end cover is rotatably connected with a ball core; the upper end cover is rotatably connected with a valve rod; a mounting cavity is formed between the upper end and the lower end of the valve body; a pushing plate is mounted in the mounting cavity; a left valve seat component isarranged in the valve body; the left valve seat component comprises a left screw sleeve; the interior of the left valve seat component is in sliding connection with a left valve seat cylinder; a leftconvex shoulder is arranged on the outer side wall of the left valve seat cylinder; a left limiting groove is formed in the valve body; a left convex rod is fixedly mounted on the left convex shoulder; a left first spring is arranged between the left screw sleeve and the left convex shoulder; a first tangent plane is formed on the side surface of the ball core; a first shaft hole and a pressure relieving hole are formed in the ball core; the interior of the first shaft hole is rotatably connected with a shaft rod; a first rotating plate is arranged at one end of the shaft rod; the ball valveis not worn in opening and closing processes; and moreover, the torque is small when the ball valve is opened and closed.

The difference between a revolution period of larger diameter-side balls and a revolution period of smaller diameter-side balls is smaller as compared with a conventional bearing. The relation, (β−10)≦α<β, is established, where α(°) represents a contact angle of the larger diameter-side ball, and β(°) represents a contact angle of the smaller diameter-side ball.