37results about How to "Improved turning performance" patented technology

A snowmobile provided with skis and being steerable by a steering shaft, and being provided with a silencer on the front side of an engine. The steering shaft passes between the engine and the silencer and overlaps the silencer in side view. Flat step floors for a rider's feet are provided on lateral sides of a lower portion of a seat. Step bars for enabling positioning of the rider's feet are provided at front portions of the step floors. The step bars are each provided on the rear side relative to the step floor tip end and within 350 mm from a track belt drive shaft which is provided on the rear side of the engine. The resulting configuration of the snowmobile makes it possible to lay out the silencer close to the engine, affords excellent turning performance, and provides step floors for good foot holding properties.

An improved component layout in a snowmobile includes a muffler is disposed on the front side of an engine, and a lower portion of a steering shaft extends between the muffler and the engine. The engine is disposed rearwardly of the lower portion of the steering shaft. In other words, the steering shaft lower portion is disposed on the front side of the engine, whereby the engine is easily relocated rearwards with respect to the vehicle body so as to concentrate the center of mass at a central location of the vehicle body.

A snowmobile provided with skis and being steerable by a steering shaft, and being provided with a silencer on the front side of an engine. The steering shaft passes between the engine and the silencer and overlaps the silencer in side view. Flat step floors for a rider's feet are provided on lateral sides of a lower portion of a seat. Step bars for enabling positioning of the rider's feet are provided at front portions of the step floors. The step bars are each provided on the rear side relative to the step floor tip end and within 350 mm from a track belt drive shaft which is provided on the rear side of the engine. The resulting configuration of the snowmobile makes it possible to lay out the silencer close to the engine, affords excellent turning performance, and provides step floors for good foot holding properties.

The invention relates to ultra-free-cutting stainless steel subjected to calcium tellurium rare earth composite treatment and a preparation method thereof. Every 100 parts of ultra-free-cutting stainless steel subjected to calcium tellurium rare earth composite treatment comprises the following raw materials in parts by weight: less than or equal to 0.08 part of C, less than or equal to 1.00 part of Si, less than or equal to 2.0 parts of Mn, less than or equal to 0.060 part of P, 0.25-0.35 part of S, 8.5-10.0 parts of Ni, 17.0-19.0 parts of Cr, 0.002-0.008 part of Ca, 0.003-0.015 part of Te (tellurium), 0.002-0.012 part of Re, and the balance of iron and other impurities. The preparation method comprises the steps that the waste stainless steel is sequentially subjected to electric arc furnace smelting, AOD refining, LF refining, continuous steel casting, blank rolling and surface treatment so as to obtain the stainless steel. According to the ultra-free-cutting stainless steel subjected to calcium tellurium rare earth composite treatment, sulfides of the stainless steel are dispersed and evenly distributed, the turning performance and the mechanical performance of the stainless steel are excellent, and meanwhile, the purposes of reducing the influence of the sulfides on the mechanical performance and improving the machinability are achieved; and in addition, according to the preparation method, by optimizing the smelting process, the yield of a final stainless steel product can reach 95% or above, and the stainless steel product possesses better mechanical performance.

A new rough terrain crane has an exhaust emission control device that has a DOC, a DRT, and a SCR. The DOC and the DRT are connected in series and disposed along a longitudinal direction of a vehicle. A rear end of the DOC is positioned at the front side relative to a rear end of an engine. The SCR is disposed in parallel to the DOC and both devices are disposed above a support member of a rear outrigger. The SCR is disposed on the upper side relative to the DOC at a position close to the engine.

A work vehicle includes a vehicle frame, a rotating connection unit provided in the vehicle frame, and a caster assembly connected to the rotating connection unit. The rotating connection unit includes a housing sleeve, a swivel post, a first bearing and a second bearing supporting the swivel post to be rotatable within the housing sleeve, and a rotation stopper disposed between the swivel post and the housing sleeve to stop rotation of the swivel post. The caster assembly includes a caster wheel, and a caster bracket connected to the swivel post to rotatably support the caster wheel.

An SCR-quipped rough terrain crane in which a urea water tank is laid out at the optimal position is provided. A rough terrain crane is equipped with an exhaust emission control device that is laterally adjacent to a diesel engine. The exhaust emission control device is provided with a urea water tank and is laid out in a rear portion of at a vehicle body. The urea water tank is disposed on a front side of the exhaust emission control device. The urea water tank is disposed in the vicinity of the left side of the diesel engine when viewed from the rear side of the vehicle.

Automatic steering and four-wheel steering are configured on an agricultural machine so that when automatic steering is enabled, a control system selectively activates and deactivates four-wheel steering depending on sensed turning or non-turning states of the machine. When automatic steering is enabled, the machine can automatically steer, such as according to a prescription map. In straightaway paths, corresponding to non-turning states, the control system can activate two-wheel steering. However, in the headlands of fields, corresponding to turning states, the control system can activate four-wheel steering. Such turning states can be determined based on the machines location on the map. Alternatively, such turning states can be determined based on sensed turning of the wheels. When an operator takes control of steering, such as by turning the steering wheel, automatic steering can disable, and the control system can activate four-wheel steering, to provide an optimum state for turning in the headlands of fields.

A work vehicle includes a vehicle frame, a rotating connection unit provided in the vehicle frame, and a caster assembly connected to the rotating connection unit. The rotating connection unit includes a housing sleeve, a swivel post, a first bearing and a second bearing supporting the swivel post to be rotatable within the housing sleeve, and a rotation stopper disposed between the swivel post and the housing sleeve to stop rotation of the swivel post. The caster assembly includes a caster wheel, and a caster bracket connected to the swivel post to rotatably support the caster wheel.

An automatic tilting vehicle is provided that includes left and right front wheels supported by knuckles, a steerable rear wheel, a vehicle tilting device, and a control unit. The vehicle tilting device includes a swing member, a tilt actuator for swing the swing member, and a pair of tie rods pivotally attached to the swing member and the knuckles. The control unit calculates a target lateral acceleration of the vehicle, estimates a lateral acceleration of the vehicle caused by the gyro moments of the wheels and calculates a target tilt angle of the vehicle based on a sum of the target lateral acceleration and the lateral acceleration caused by the gyro moments.

The invention discloses a clamping device for turning a guide vane of a gas turbine. The clamping device comprises a bottom frame, wherein an electric motor is fixedly connected to the bottom of the inner surface of the bottom frame, an output shaft of the electric motor is fixedly connected to a rotating rod, the top end of the rotating rod is fixedly connected to a rotating table, a clamping mechanism is arranged on the top of the rotating table, and an absorption mechanism is arranged one on side of the rotating table on the top of the outer surface of the bottom frame. By means of the clamping mechanism, the absorption mechanism and a decelerating rod, guide vanes of different sizes and thicknesses can be clamped and fixed well by the clamping mechanism, so that it is convenient for follow-up turning. Metal scrap generated in the turning process can be absorbed well by the absorption mechanism and is prevented from polluting the surrounding environment, so that the using effect isimproved. The electric motor drives the rotating table to rotate more precisely by means of the decelerating rod, so that a better turning effect can be exerted, and the clamping device has a certainpositive effect.

The invention provides a tool holder structure for a machine tool, which belongs to the technical field of machinery. It solves the problem that the existing knife holder cannot be adjusted. The tool rest structure of this machine tool includes a base, a fine knife rest, a rough knife rest, and a driving part that can drive the rough knife rest relative to the base to translate back and forth. The base is also fixed with an adjustment block. The fine knife rest is long. It is strip-shaped and extends along the front and rear directions of the base. The front end of the fine knife holder is used to install the fine knife, and the rear end of the fine knife holder is semi-cylindrical. Inside, the wall of the semicircular hole is provided with a strip-shaped crushing groove along the left and right direction of the base. The length of the crushing groove extends along the front and rear directions of the base and both ends of the crushing groove are open. A detachable positioning mechanism that elastically deforms the upper side wall of the groove downwards and presses the semicircular hole wall against the rear end side wall of the fine knife holder. The invention has the advantage of being able to adjust the positions of the fine knife and the rough knife.

The invention relates to a manufacturing device, in particular to a turning type rolling pin manufacturing device. According to the turning type rolling pin manufacturing device provided by the invention, high-speed rotation of logs can be realized, the logs can be automatically and uniformly scraped, and scraped chippings can be stored in time. The turning type rolling pin manufacturing device comprises four supporting columns, a workbench, a collecting frame and a rotating mechanism; the supporting columns are arranged on a base; the workbench is arranged at the upper parts of the supporting columns; the collecting frame used for collecting chippings is placed on the base; and the rotating mechanism is arranged on the workbench. According to the turning type rolling pin manufacturing device, through cooperation of a clamping mechanism, the rotating mechanism and a turning mechanism, the effects of high-speed rotation and automatic and uniform log scraping are achieved; and through cooperation of a filtering mechanism and a discharging mechanism, automatic discharging is achieved, and meanwhile the scraped chippings are filtered and stored in time.

The invention provides a method for improving the turning machinability of a high-strength titanium alloy ingot. The method comprises the following steps: putting the high-strength titanium alloy ingot into a heat treatment furnace for high-temperature heat treatment; then, taking the high-strength titanium alloy ingot subjected to the high-temperature heat treatment out of the heat treatment furnace; carrying out rapid water cooling to 25-150 DEG C; and finally, subjecting the cooled high-strength titanium alloy ingot to turning machining by utilizing a lathe, wherein a tungsten-cobalt hard alloy is adopted as a turning machining tool during the turning machining process. According to the method provided by the invention, a high-temperature heat treatment and rapid cooling combined method is adopted, so that a single-phase alloy structure can be achieved, secondary precipitation phase strengthening can be avoided; and the strength of a material at a certain depth of the ingot surface can be reduced. Accordingly, the difficulty in turning machining of the ingot surface can be greatly reduced and the number of times that the turning machining tool is replaced can be reduced. Meanwhile, the machining efficiency can be improved and the production cycle can be shortened.

The invention relates to an aluminum alloy extruded bar and a preparation technology thereof. The aluminum alloy extruded bar comprises, by mass, 0.4-0.5% of Si, 0.5-0.6% of Fe, 0.15-0.20% of Cu, 1.0-1.2% of Mn, no more than 0.10% of Ti, less than 0.15% of other impurities, and the balance Al. The preparation technology comprises the following steps of smelting, alloying, refining, semi continuouswater-cooling casting, two-stage homogenizing treatment, water mist strong cooling, sawing, three-stage heating, quenching, stretching straightening and the like. The aluminum alloy extruded bar hasgood strength and machining performance and stable alloy fiber crystal crystallization.