51results about How to "Improve NVH characteristics" patented technology

A multi-piece propeller shaft (10) for use in an automotive vehicle. The multi-piece propeller shaft including a first or front section (42) and a second or rear section (14). The first section including a first crash feature in the form of a sliding spline (44, 46, 48). The second section including a second crash feature in the form of a collapsible constant velocity joint (20). The multi-piece propeller shaft capable of collapsing at predetermined loads and at predetermined times to have a tunable crash absorbing propeller shaft for use in automotive vehicles.

The invention discloses a car multifunctional support bracket which comprises a lower side plate which is equipped with a hole connected with a suspension cushion assembly. The invention is characterized in that a front side plate is arranged at the front end of the lower side plate the rear end of which is provided with a rear side plate, the front side plate is equipped with two installation holes which are connected with a motor and a gear box, the rear side plate is provided with an installation hole connected with a starter. For increasing rigidity, the front side plate is provided with an upshot convex rib, and the front side plate is connected with the rear side plate after the rear side plate is bent. Because the power assembly, the suspension, the starter, the motor and the gear box are compactly combined within a very limited space, the combination portion and the suspension cushion form a whole vibration isolation system, thereby the arrangement of the elements of the system is more compact, one stage bending mode of the power assembly is obviously increased, and the connecting rigidity of the motor and the gear box is increased. The invention is capable of ensuring good NVH (noise, vibration and harshness) properties of the whole vehicle under all working conditions, which has the advantages of light-weight design, simple construction, good manufacturability, easy production and low costs. The invention is adaptable for occasions on which hydraulic engine mount is employed.

The teachings herein are related to assemblies, such as oil pan assemblies, including a laminate bottom portion and a nut attached to the laminate bottom portion. The nut may provide a sealable opening to a cavity of the assembly. The laminate bottom portion preferably includes a polymeric layer sandwiched between two metallic layers. The nut preferably is a clinch nut.

The invention relates to the field of optimization for automobile NVH, and specifically discloses an adjustment method for the corresponding rotational speeds of gears of an air blower of an automobile air conditioner. The adjustment method for the corresponding rotational speeds of the gears of the air blower of the automobile air conditioner comprises the following steps: determining the maximumrotational speed rmax and the minimum rotational speed rmin of the air blower, and the number m of the gears of the air blower at first; preliminarily selecting the corresponding rotational speed ofeach gear of the air blower; determining a selection interval of corresponding new rotational speeds of the gears, obtaining a near-field noise waterfall plot, and measuring the total noise value of the air blower; conforming the two main orders of a motor, and selecting the noise values of the two main orders by virtue of software; and combining the selected noise values and the total noise valueof the air blower into the same graph, and determining the corresponding new rotational speeds of the gears according to the results of the overall noise of the air blower and the noises of the mainorders. By virtue of the abovementioned method, the matching between the gears and the rotational speeds of the air blower can be optimized; and on the premise of not adding other requirements, the parotic noises of a driver and passengers are effectively and reasonably reduced, and the NVH characteristic of an automobile is improved.

PROBLEM TO BE SOLVED: To prevent a valve opening click sound occurring in a case where an armature collides with a polar core in electrification.SOLUTION: In a valve closing type solenoid valve 1 with no current, a polar core 2 is fixed and arranged, an armature 3 includes a valve sleeve 5 arranged so as to be displaceable in an axial direction, and in order to eliminate a valve closing element cooperating with the armature 3 into a valve seat, a compression spring 4 acts between the polar core 2 and the armature 3. The valve 1 is characterized in that between the polar core 2 and the armature 3, is formed means 11 of hydraulically buffering displacement of the armature 3.SELECTED DRAWING: Figure 2

The invention provides a lifting lug for an automobile exhaust system and a vehicle with lifting lugs. The lifting lug for the automobile exhaust system comprises a connecting rod and two symmetrically arranged bodies, wherein an opening is formed in each body, and penetrates through the thickness of the body; the two ends of the connecting rod penetrate through the sidewalls of the corresponding openings, and extend into the openings respectively; at least one of the two bodies can rotate relative to the connecting rod. According to the lifting lug for the automobile exhaust system, the two bodies are arranged on the connecting rod, and at least one of the two bodies can rotate relative to the rotating rod, then the body capable of rotating relative to the connecting rod can bear higher torque when the lifting lug is twisted due to improper assembly or generated non-directional excitation energy of an exhaust pipe of the exhaust system, the probability of lifting lug failure and even tearing caused by stress concentration is further lowered, and the vibration of the exhaust pipe is reduced, so that the NVH (noise vibration and harshness) properties of the vehicle are improved.

A bearing device for a wheel, in which circumferential play is suppressed, which facilitates connection between a hub ring and an outer coupling member, in which a reduction in NVH characteristics dueto play at a joint between the hub ring and the constant velocity universal joint and by play between a bearing outer member and a knuckle is prevented, and which performs highly accurate transmission of rotational torque. The bearing device has a groove-ridge fitting structure (M) by which the hub ring (1) and a shaft section (12) of the outer coupling member of the constant velocity universal joint (3) are integrated together, and the shaft section (12) is fitted in a hole (22) of the hub ring (1). In the groove-ridge fitting structure (M), ridges (35) on the outer diameter surface of the shaft section (12) and grooves (36) in the inner diameter surface (37) of the hub ring (1) are fitted to each other in a fitting contact portion (38), and the ridges (35) and the grooves (36) are in intimate contact with each other in the entire fitting contact portion (38).

Provided is a bearing device for a wheel that can realize prevention of a backlash in a circumferential direction and is excellent in workability of connection of a hub wheel and an outer joint member of a constant velocity universal joint. Further, provided is a bearing device for a wheel that can prevent deterioration in NVH characteristics, which is caused by the backlash occurring in a joint section between the hub wheel and the constant velocity universal joint or between an outer member and a knuckle, and can perform rotation torque transmission with high accuracy. The bearing device includes a recess-projection fitting structure (M) in which the hub wheel (1) and a shaft section (12), which is fitted in a hole (22) of the hub wheel (1) of the outer joint member of the constant velocity universal joint (3) are unitized together. In the recess-projection fitting structure (M), entire fitting regions among projections (35) on the outer surface of the shaft section (12) of the outer joint member and recesses (36), which fit on the projections, are brought into intimate contact with each other.

A dynamic assembly vibration isolation system is provided, which comprises an external shell body connected with a right bracket, a front bracket and a rear bracket, a left bracket, a buffer, a bolt,a connecting rod, a rubber body and an internal shell body. The buffer is positioned between the left bracket and the shell body. The invention is characterized in that: the external shell body is connected with the internal shell body and a hollow cavity is enclosed between; a ventilation hole is made on the external shell; a rubber body is sulfurized on the internal shell body; the connecting rod is planted into the rubber body; the connecting rod is connected with the left bracket via a bolt. A damping fluid and a decoupling film are positioned in the area enclosed by the rubber body and internal shell body; the decoupling film and the rubber body enclose a lower fluid chamber; the decoupling film and the internal shell body enclose an upper fluid chamber; a passage internal cavity, aninertia passage internal cavity and an inertia passage are positioned. Due to the adoption of a fluid blocking type vibration isolation system, the components in the invention can integrate in a compact way and light weight structure and excellent manufacturing technique can be realized. Therefore, under all working conditions, the invention is able to realize outstanding vibration isolation and reduction effect, so as to ensure excellent NVH performance for the whole vehicle. In addition, because the invention resolves the problems of high frequency dynamic hardening and shorter service lifegenerally existed in a rubber suspension vibration isolation system, the invention can be applied to automobiles.