Balance shaft assembly and automobile suspension system

Abstract

The invention relates to the technical field of automobile suspensions, in particular to a balance shaft assembly and an automobile suspension system. The balance shaft assembly comprises a balance shaft support, a flexible bush and a shaft shell, a shaft part is formed on the balance shaft support, the flexible bush is arranged on the shaft part in a sleeving mode, and the shaft shell is arranged on the flexible bush in a sleeving mode. The diameter of the outer wall of the shaft part is gradually reduced from the middle to the two ends to form a first limiting matching face, the inner diameter of the inner wall of the shaft shell is gradually reduced from the middle to the two ends to form a second limiting matching face, and a third limiting matching face matched with the first limiting matching face is formed on the inner wall of the flexible lining. And a fourth limiting matching surface matched with the second limiting matching surface is formed on the outer wall of the flexible bushing. The invention provides a balance shaft assembly and an automobile suspension system, which are used for overcoming the defects that in the existing balance shaft assembly, a composite bushing possibly has the risk of sliding along a balance shaft bracket, so that the relative position between a balance shaft shell and a steel plate spring deviates, and potential safety hazards of personnel and goods are caused.

Description

Technical Field

[0001] The invention relates to the technical field of automobile suspension, and in particular to a balance shaft assembly and an automobile suspension system. Background Art

[0002] The balance shaft assembly is a load-bearing structure in the automobile suspension and is usually installed on the frame by bolts. The leaf spring is a key elastic element of the suspension system and is installed on the balance shaft assembly to reduce vibration and improve comfort. Therefore, the leaf spring should be reliably fixed to the balance shaft bracket.

[0003] However, for the composite bushing balance shaft assembly, the leaf spring is fixedly connected to the balance shaft housing. Since the composite bushing can be deformed, under complex working conditions, there is a risk that the composite bushing slides along the balance shaft bracket, causing the relative position of the balance shaft housing and the leaf spring to be out of control, posing a safety hazard to personnel and cargo. Summary of the invention

[0004] The present invention provides a balancing shaft assembly and an automobile suspension system, which are used to solve the defect in the existing balancing shaft assembly that a composite bushing may slide along a balancing shaft bracket, causing a relative position shift between the balancing shaft housing and a leaf spring, thereby causing potential safety hazards to personnel and cargo.

[0005] One aspect of the present invention provides a balancing shaft assembly, including: a balancing shaft bracket, a flexible bushing and a shaft shell, wherein a shaft portion is formed on the balancing shaft bracket, the flexible bushing is sleeved on the shaft portion, and the shaft shell is sleeved on the flexible bushing.

[0006] The outer wall of the shaft portion gradually decreases in diameter from the middle to the two ends to form a first limit fitting surface, the inner wall of the shaft housing gradually decreases in inner diameter from the middle to the two ends to form a second limit fitting surface, the inner wall of the flexible bushing is formed with a third limit fitting surface that matches the first limit fitting surface, and the outer wall of the flexible bushing is formed with a fourth limit fitting surface that matches the second limit fitting surface.

[0007] According to the balancing shaft assembly provided by the present invention, the first limiting fitting surface, the second limiting fitting surface, the third limiting fitting surface and the fourth limiting fitting surface are all arc-shaped transition surfaces.

[0008] According to the balancing shaft assembly provided by the present invention, the first limiting fitting surface, the second limiting fitting surface, the third limiting fitting surface and the fourth limiting fitting surface are all arc transition surfaces.

[0009] According to the balancing shaft assembly provided by the present invention, the diameters of the first limiting fitting surface and the third limiting fitting surface are both 90 mm to 120 mm, the diameters of the second limiting fitting surface and the fourth limiting fitting surface are both 140 mm to 160 mm, and the length of the shaft portion is 180 mm to 200 mm.

[0010] According to the balancing shaft assembly provided by the present invention, a first limiting protrusion is formed on the inner wall of the flexible bushing, a first limiting groove is formed on the outer wall of the shaft portion, and the first limiting protrusion cooperates with the first limiting groove; a second limiting protrusion is formed on the outer wall of the flexible bushing, a second limiting groove is formed on the inner wall of the shaft housing, and the second limiting protrusion cooperates with the second limiting groove.

[0011] The balancing shaft assembly provided according to the present invention further includes a cover body, and the cover body is detachably connected to one end of the shaft housing.

[0012] According to the balance shaft assembly provided by the present invention, the shaft housing includes a first shaft housing and a second shaft housing, and the first shaft housing and the second shaft housing are arranged opposite to each other and are detachably connected.

[0013] According to the balancing shaft assembly provided by the present invention, the flexible bushing is formed by vulcanizing and bonding rubber and a metal plate.

[0014] The balancing shaft assembly provided according to the present invention further includes a gasket, which is arranged between the shaft housing and the balancing shaft bracket to block the gap between the shaft housing and the balancing shaft bracket.

[0015] Another aspect of the present invention provides a vehicle suspension system, comprising a vehicle frame and a balancing shaft assembly as described in any one of the above items, wherein the balancing shaft assembly is connected to the vehicle frame.

[0016] The balancing shaft assembly provided by the present invention is configured such that a first limit fitting surface with a diameter gradually decreasing from the middle to the two ends is arranged on the outer wall of the shaft portion, a second limit fitting surface with a diameter gradually decreasing from the middle to the two ends is arranged on the inner wall of the shaft portion of the shaft shell, a third limit fitting surface cooperating with the first limit fitting surface is arranged on the inner wall of the flexible bushing, and a fourth limit fitting surface cooperating with the second limit fitting surface is arranged on the outer wall of the flexible bushing. The flexible bushing can be locked between the shaft portion and the shaft shell through the cooperation of the limit fitting surfaces, and can effectively prevent it from slipping or even falling off during use.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is one of the schematic diagrams of the balance shaft assembly provided in the embodiment of the present invention.

[0020] Figure 2 This is the second schematic diagram of the balance shaft assembly provided in the embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of a balancing shaft bracket in a balancing shaft assembly provided in an embodiment of the present invention.

[0022] Figure 4 It is a schematic diagram of a flexible bushing in a balance shaft assembly provided in an embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of the first shaft housing in the balance shaft assembly provided in an embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram of the second shaft housing in the balance shaft assembly provided in an embodiment of the present invention.

[0025] Reference numerals: 10. Balance shaft bracket; 110. Shaft; 111. First limit fitting surface; 120. Frame mounting hole; 130. Thrust rod mounting hole; 20. Flexible bushing; 210. Third limit fitting surface; 220. Fourth limit fitting surface; 30. Axle housing; 310. First axle housing; 320. Second axle housing; 330. Second limit fitting surface; 40. Cover; 50. Washer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] Combine the following Figures 1 to 6 The invention describes a balance shaft assembly and an automobile suspension system.

[0032] See also Figure 1 and Figure 2 As shown, the balancing shaft assembly provided by the embodiment of the present invention includes: a balancing shaft bracket 10, a flexible bushing 20 and a shaft housing 30, a shaft portion 110 is formed on the balancing shaft bracket 10, the flexible bushing 20 is sleeved on the shaft portion 110, and the shaft housing 30 is sleeved on the flexible bushing 20.

[0033] The outer wall of the shaft portion 110 gradually decreases in diameter from the middle to the two ends to form a first limit fitting surface 111, and the inner wall of the shaft housing 30 gradually decreases in inner diameter from the middle to the two ends to form a second limit fitting surface 330. The inner wall of the flexible bushing 20 is formed with a third limit fitting surface 210 that matches the first limit fitting surface 111, and the outer wall of the flexible bushing 20 is formed with a fourth limit fitting surface 220 that matches the second limit fitting surface 330.

[0034] The balancing shaft assembly provided by the present invention is achieved by setting a first limit fitting surface 111 on the outer wall of the shaft portion 110, with a diameter gradually decreasing from the middle to the two ends; setting a second limit fitting surface 330 on the inner wall of the shaft portion 110, with a diameter gradually decreasing from the middle to the two ends; and setting a third limit fitting surface 210 on the inner wall of the flexible bushing 20 to cooperate with the first limit fitting surface 111; and setting a fourth limit fitting surface 220 on the outer wall of the flexible bushing 20 to cooperate with the second limit fitting surface 330. The flexible bushing 20 can be locked between the shaft portion 110 and the shaft housing 30 through the cooperation of the limit fitting surfaces, which can effectively prevent it from slipping or even falling off during use.

[0035] Specifically, see Figure 3 As shown, according to some embodiments of the present invention, a frame mounting hole 120 and a thrust rod mounting hole 130 are provided on the balance shaft bracket 10. The frame mounting hole 120 is used to fix the balance shaft bracket 10 to the engine frame or cylinder block to ensure that the bracket is stably and firmly connected during the operation of the engine to avoid displacement or loosening. The thrust rod mounting hole 130 is used to install the thrust rod, which limits the axial displacement of the balance shaft by providing axial support to prevent the balance shaft from being offset or unstable during rotation. The thrust rod is connected to the bracket to transfer the axial load to the frame or other fixed structure, thereby ensuring the stable operation of the balance shaft.

[0036] The shaft housing 30 includes a first shaft housing 310 and a second shaft housing 320 which are arranged opposite to each other. The first shaft housing 310 and the second shaft housing 320 are arranged opposite to each other and are detachably connected. During assembly, after the flexible bushing 20 is sleeved on the shaft portion 110 of the balance shaft bracket 10, the first shaft housing 310 and the second shaft housing 320 are buckled and connected to each other.

[0037] The end of the shaft housing 30 is detachably provided with a cover body 40, which is used to seal the end of the flexible bushing 20 to prevent foreign matter from entering the working space of the flexible bushing and affecting the stability of the balance shaft assembly during operation.

[0038] The first shaft housing 310 and the second shaft housing 320 can be detachably connected by clamping or by using threaded connectors (such as bolt and nut assemblies). Similarly, the cover 40 and the end of the shaft housing 30 can be detachably connected by clamping or by using threaded connectors.

[0039] Preferably, in this embodiment, the first shaft housing 310 and the second shaft housing 320 are configured to be detachably connected by a threaded connector. During assembly, the corresponding mounting holes on the first shaft housing 310 and the second shaft housing 320 are aligned, and then the threaded connector is used to tighten. The cover body 40 and the end of the shaft housing 30 are also configured to be detachably connected by a threaded connector. After the first shaft housing 310 and the second shaft housing 320 are assembled, the corresponding mounting holes on the shaft housing 30 and the cover body 40 are aligned, and then the threaded connector is used to tighten, which is easy to disassemble and assemble.

[0040] The flexible bushing 20 is made of a flexible material and has a certain deformation capability. It can absorb shock and vibration during operation, improve fitting accuracy, reduce friction, and compensate for manufacturing tolerances.

[0041] Preferably, the rubber and the metal plate are bonded by vulcanization, which has a simple structure, is easy to implement, and has reliable bonding.

[0042] In this embodiment, the diameter of the outer wall of the shaft portion 110 gradually decreases from the middle to the two ends, and the inner diameter of the inner wall of the shaft housing 30 gradually decreases from the middle to the two ends. Specifically, it can be in the form of linear reduction, nonlinear reduction, etc. Among them, linear reduction means that the outer wall of the shaft portion 110 (or the inner wall of the shaft housing 30) gradually decreases along a straight line in the length direction, which means that the rate at which the diameter changes with the length is constant, that is, the size change per unit length is uniform. Nonlinear reduction means that the diameter change of the outer wall of the shaft portion 110 (or the inner wall of the shaft housing 30) does not follow a linear law, but gradually decreases in the form of a nonlinear function. For example, the diameter change of the shaft may be in the shape of an exponential, square, cubic or other curve.

[0043] According to some embodiments of the present invention, the first position-limiting mating surface 111 , the second position-limiting mating surface 330 , the third position-limiting mating surface 210 and the fourth position-limiting mating surface 220 are all arc-shaped transition surfaces.

[0044] By configuring the first limit mating surface 111, the second limit mating surface 330, the third limit mating surface 210 and the fourth limit mating surface 220 as arc-shaped transition surfaces, the stress concentration phenomenon when the mating surfaces cooperate with each other can be reduced, friction and wear can be reduced, and the fitting accuracy and stability can be improved while ensuring the stability of the flexible bushing 20.

[0045] Specifically, the arc-shaped transition surface disperses stress through smooth transition and avoids local damage to the matching structures, thereby improving the service life and fatigue resistance of the balance shaft assembly. In addition, the design also improves the assembly and disassembly process, making component installation smoother, adapting to long-term use under high load and complex environments, and improving overall operating stability.

[0046] According to the balancing shaft assembly provided by the present invention, the first limiting mating surface 111 , the second limiting mating surface 330 , the third limiting mating surface 210 and the fourth limiting mating surface 220 are all arc transition surfaces.

[0047] By configuring the first limiting mating surface 111, the second limiting mating surface 330, the third limiting mating surface 210 and the fourth limiting mating surface 220 as arc transition surfaces, the limiting mating surfaces have a more uniform stress distribution when they cooperate with each other, which can effectively reduce stress concentration, thereby improving the durability and fatigue resistance of the flexible bushing 20.

[0048] Specifically, each limit matching surface is configured as an arc transition surface, and the smooth and continuous geometric shape makes the processing accuracy of the limit matching surface higher and the manufacturing error smaller. In addition, the arc transition surface can reduce friction and wear and extend the service life.

[0049] According to some embodiments of the present invention, the diameters of the first limiting mating surface 111 and the third limiting mating surface 210 are both 90 mm to 120 mm, the diameters of the second limiting mating surface 330 and the fourth limiting mating surface 220 are both 140 mm to 160 mm, and the length of the shaft portion 110 is 180 mm to 200 mm.

[0050] On the basis that the first limit fitting surface 111, the second limit fitting surface 330, the third limit fitting surface 210 and the fourth limit fitting surface 220 are all arc transition surfaces, by configuring the diameters of the first limit fitting surface 111 and the third limit fitting surface 210 to be 90mm to 120mm, the diameters of the second limit fitting surface 330 and the fourth limit fitting surface 220 to be 140mm to 160mm, and the length of the shaft to be 180mm to 200mm, it is possible to improve not only the contact area of ​​the limit fitting surfaces when they are fitted, but also the stability of the flexible bushing 20 when it is working, but also realize its various directions (axial, radial, torsional, deflection) stiffness when the balance shaft assembly is working, thereby meeting the working conditions of the whole vehicle.

[0051] It should be noted that the diameter of the first limit fitting surface 111 and the third limit fitting surface 210 is 90mm to 120mm, which means that the diameter from both ends to the middle of the first limit fitting surface 111 and the third limit fitting surface 210 gradually transitions from 90mm to 120mm. Similarly, the diameter of the second limit fitting surface 330 and the fourth limit fitting surface 220 is 140mm to 160mm, which means that the diameter from both ends to the middle of the second limit fitting surface 330 and the fourth limit fitting surface 220 gradually transitions from 140mm to 160mm.

[0052] The length of the shaft portion 110 may be 180 mm, 190 mm, or 200 mm, etc.

[0053] According to some embodiments of the present invention, a first limiting protrusion (not shown in the figure) is formed on the inner wall of the flexible bushing 20, and a first limiting groove (not shown in the figure) is formed on the outer wall of the shaft portion 110, and the first limiting protrusion cooperates with the first limiting groove; a second limiting protrusion (not shown in the figure) is formed on the outer wall of the flexible bushing 20, and a second limiting groove (not shown in the figure) is formed on the inner wall of the shaft housing 30, and the second limiting protrusion cooperates with the second limiting groove.

[0054] By providing a limiting protrusion and a limiting slot structure on the inner wall of the flexible bushing 20 and the outer wall of the shaft portion 110, and the outer wall of the flexible bushing 20 and the inner wall of the shaft housing 30, the flexible bushing 20 can be effectively positioned and reliably fixed to the shaft portion 110 and the shaft housing 30. Specifically, the cooperation between the first limiting protrusion and the first limiting slot and the cooperation between the second limiting protrusion and the second limiting slot can prevent the flexible bushing 20 from axial or radial displacement during operation, ensuring that the flexible bushing 20 always remains in a predetermined position. This limiting matching structure can provide additional stability, prevent the flexible bushing 20 from loosening due to vibration or external impact, and reduce wear and damage caused by displacement.

[0055] It should be noted that the number of the first limiting protrusion, the first limiting slot, the second limiting protrusion and the second limiting slot is at least one. When the number of the first limiting protrusion, the first limiting slot, the second limiting protrusion and the second limiting slot is multiple, the first limiting protrusion and the first limiting slot correspond one-to-one, the second limiting protrusion and the second limiting slot correspond one-to-one, and are arranged at intervals along the axial direction, which can further enhance the stability of the shaft sleeve.

[0056] According to some embodiments of the present invention, the balancing shaft assembly further includes a washer 50 , which is disposed between the shaft housing 30 and the balancing shaft bracket 10 to block a gap between the shaft housing 30 and the balancing shaft bracket 10 .

[0057] By setting a gasket 50 between the shaft housing 30 and the balance shaft bracket 10, the gap between the shaft housing 30 and the balance shaft bracket 10 can be blocked to prevent foreign debris from entering the working space of the flexible bushing 20, thereby further improving the stability of the flexible bushing 20 during operation.

[0058] The automobile suspension system provided by the present invention is described below. The automobile suspension system described below and the balance shaft assembly described above can be referred to each other.

[0059] The vehicle suspension system provided by the embodiment of the present invention comprises a vehicle frame and a balancing shaft assembly as described in any one of the above embodiments, wherein the balancing shaft assembly is connected to the vehicle frame.

[0060] The automobile suspension system provided by the present invention adopts the above-mentioned balancing shaft assembly, so that the stability of the flexible bushing 20 during operation can be ensured, thereby ensuring the stability of the automobile suspension system.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A balance shaft assembly, characterized in that: include: A balancing shaft bracket, a flexible bushing and a shaft shell, wherein a shaft portion is formed on the balancing shaft bracket, the flexible bushing is sleeved on the shaft portion, and the shaft shell is sleeved on the flexible bushing; The outer wall of the shaft portion gradually decreases in diameter from the middle to the two ends to form a first limit fitting surface, the inner wall of the shaft housing gradually decreases in inner diameter from the middle to the two ends to form a second limit fitting surface, the inner wall of the flexible bushing is formed with a third limit fitting surface that matches the first limit fitting surface, and the outer wall of the flexible bushing is formed with a fourth limit fitting surface that matches the second limit fitting surface.

2. The balance shaft assembly according to claim 1, characterized in that: The first position-limiting mating surface, the second position-limiting mating surface, the third position-limiting mating surface and the fourth position-limiting mating surface are all arc-shaped transition surfaces.

3. The balance shaft assembly according to claim 2, characterized in that: The first position-limiting mating surface, the second position-limiting mating surface, the third position-limiting mating surface and the fourth position-limiting mating surface are all arc transition surfaces.

4. The balance shaft assembly according to claim 3, characterized in that: The diameters of the first and third position-limiting mating surfaces are both 90 mm to 120 mm, the diameters of the second and fourth position-limiting mating surfaces are both 140 mm to 160 mm, and the length of the shaft is 180 mm to 200 mm.

5. The balancing shaft assembly according to any one of claims 1 to 4, characterized in that: The inner wall of the flexible bushing is formed with a first limiting protrusion, the outer wall of the shaft portion is formed with a first limiting groove, and the first limiting protrusion is limitedly matched with the first limiting groove; A second limiting protrusion is formed on the outer wall of the flexible bushing, and a second limiting groove is formed on the inner wall of the shaft housing. The second limiting protrusion is limitedly matched with the second limiting groove.

6. The balance shaft assembly according to any one of claims 1 to 4, characterized in that: It also includes a cover body, which is detachably connected to one end of the shaft housing.

7. The balancing shaft assembly according to any one of claims 1 to 4, characterized in that: The shaft housing comprises a first shaft housing and a second shaft housing, wherein the first shaft housing and the second shaft housing are arranged opposite to each other and are detachably connected.

8. The balance shaft assembly according to any one of claims 1 to 4, characterized in that: The flexible bushing is formed by vulcanizing and bonding rubber and metal plates.

9. The balance shaft assembly according to any one of claims 1 to 4, characterized in that: It also includes a gasket, which is arranged between the shaft housing and the balance shaft support to block the gap between the shaft housing and the balance shaft support.

10. An automobile suspension system, characterized in that: The invention comprises a vehicle frame and a balancing shaft assembly as claimed in any one of claims 1 to 9, wherein the balancing shaft assembly is connected to the vehicle frame.

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