A new type of heavy-duty truck tapered balance shaft bushing

Abstract

This utility model relates to automotive parts, providing a novel heavy-duty truck tapered balance shaft bushing. It includes a cylindrical central frame and parallel to one end of the central frame, consisting of an outer frame, a middle frame, an inner frame, and an elastic body disposed on the inner and outer surfaces of each frame. The middle and inner frames are fitted onto the central frame, and the outer frame extends beyond the central frame in the axial direction. The inner frame is characterized by a porous titanium alloy layer with a first Teflon coating on the side away from the elastic body. The outer frame has a second Teflon coating on the side that connects to the heavy-duty truck tapered balance shaft or balance end cap. The thickness of the elastic body gradually decreases from the center to both ends, with the center thickness being 4mm-6mm greater than the ends. This utility model solves the problem of low creep resistance in balance shaft rubber bushings, leading to creep failure under the high torque generated during heavy-duty truck operation.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a novel heavy-duty truck tapered balance shaft bushing. Background Technology

[0002] With the development of economy and science and technology, automobiles have become the most important means of transportation for people. Auto parts are the various units that make up a car and the products that serve the car. There are many types of auto parts. As people's living standards improve, people's consumption of automobiles is also increasing, and the market for auto parts is becoming larger and larger. In recent years, auto parts manufacturers have also been developing rapidly.

[0003] Currently, the balance shaft bushings used in ordinary balance suspensions are steel bimetallic bushings, which lack cushioning performance, require high strength from the shaft and balance wheel hub, and are prone to premature wear due to poor lubrication. Although there are balance shaft rubber bushings, their creep resistance is not high, and they are susceptible to creep failure under the high torque generated by heavy truck operation. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model proposes a new type of heavy truck tapered balance shaft bushing with stable and durable structure and good fixing effect.

[0005] To solve this technical problem, the present invention adopts the following solution: a novel heavy-duty truck tapered balance shaft bushing, comprising a cylindrical central frame and an outer frame, a middle frame, an inner frame, and an elastic body disposed on the inner and outer surfaces of each frame, all arranged parallel to one end of the central frame. The middle frame and the inner frame are fitted onto the central frame. The outer frame extends beyond the central frame in the axial direction. The inner frame is a porous titanium alloy layer, and the side of the inner frame away from the elastic body is provided with a first Teflon coating. The side of the outer frame that connects with the heavy-duty truck tapered balance shaft or balance end cap is provided with a second Teflon coating. The thickness of the elastic body in the axial direction gradually decreases from the center to both ends, and the thickness at the center is 4mm-6mm greater than the thickness at both ends.

[0006] In a further improvement, multiple longitudinal openings are evenly distributed on the elastic body of the inner circumferential surface of the central skeleton.

[0007] In a further improvement, the outer frame has at least one notch on its inner and outer ring edges, and the outer frame end face has at least one groove.

[0008] In a further improvement, each groove on the end face of the exoskeleton extends from the center to the edge to form an extension portion, and the extension portion and the groove form an inverted T-shaped groove.

[0009] A further improvement is made: the free edges of the extensions on each groove are curved.

[0010] In a further improvement, the outer skeleton, the intermediate skeleton, and the inner skeleton are all provided with a gap filled with an elastomer.

[0011] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: By using a porous titanium alloy layer as the inner skeleton, the bonding force between the inner skeleton and the rubber elastomer is effectively improved. Specifically, the porous titanium alloy layer with laser cladding increases the peel strength between rubber and metal to more than three times that of traditional phosphating treatment. The thickness of the elastomer gradually decreases from the center to both ends, with the center thickness being 4mm-6mm greater than the thickness at both ends, thus forming a conical compression zone in the elastomer. The combination of the porous titanium alloy layer and the conical compression zone significantly improves its overall creep resistance, avoiding the creep failure problem under high torque during heavy truck operation. The first Teflon coating and the second Teflon coating on the inner and outer skeletons reduce friction between the inner skeleton and the balance shaft housing, as well as between the balance shaft and the outer skeleton, extending the service life. Furthermore, its non-stick properties prevent the accumulation of dust and other adhesive substances, which can cause wear and instability in the mating structure, making the overall structure more stable and durable, and providing a better fixing effect with the balance shaft. By using an inverted T-shaped groove to create an undulating curved surface structure on the end face of the rubber elastomer, the force direction of the traditional flat rubber elastomer is changed. When the rubber bushing is subjected to axial load, the stress is distributed and transmitted along the curved surface of the T-shaped groove. When the rubber elastomer deforms, radial creep compensation automatically fills the micro gaps, further enhancing the stability of the overall structure and making it widely applicable. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the exoskeleton structure in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of this utility model assembled on the balance shaft according to an embodiment of the present invention. Detailed Implementation

[0013] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0014] refer to Figures 1-2The preferred embodiment of this novel heavy-duty truck tapered balance shaft bushing includes a cylindrical central frame 1 and an outer frame 2, a middle frame 3, and an inner frame 4, all of which are annular and arranged parallel to one end of the central frame 1, as well as elastic bodies 5 disposed on the inner and outer surfaces of each frame. The middle frame 3 and the inner frame 4 are sleeved on the central frame 1. The elastic bodies 5 on the inner circumferential surface of the central frame 1 have multiple longitudinal openings 51 evenly distributed at intervals. The outer frame 2 extends beyond the central frame 1 in the axial direction. There are gaps between the outer frame 2, the middle frame 3, and the inner frame 4 filled with elastic bodies 5. The inner frame 4 is a porous titanium alloy layer and has an inner core. The side of the frame 4 away from the elastomer 5 is provided with a first Teflon coating 41, and the side of the outer frame 2 that connects with the heavy truck tapered balance shaft 6 or balance end cap 7 is provided with a second Teflon coating 21. The thickness of the elastomer 5 gradually decreases from the center to both ends, and the thickness at the center is 5 mm greater than the thickness at both ends. The outer frame 2 has multiple notches 22 on both the inner and outer ring edges. The end face of the outer frame 2 has multiple grooves 23. Each groove 23 on the end face of the outer frame 2 extends from the center to the edge to form an extension 231, and the extension 231 and the groove 23 form an inverted T-shaped groove. The free edge of the extension 231 provided on each groove 23 is an arc-shaped edge.

[0015] refer to Figure 2 In use, two balance shaft bushings are symmetrically fitted onto the ends of the balance shaft 6 and the balance shaft bushings are locked between the balance end cover 7 and the balance shaft 6 by bolts 8, and the balance shaft housing 9 is fitted and locked onto the outer circumference of the two balance shaft bushings.

[0016] In the above embodiments, the elastomer is a wear-resistant composite rubber or a composite of natural rubber and butadiene rubber. The elastomer of natural rubber and butadiene rubber composite is made of 70% natural rubber (NR) and 30% butadiene rubber (BR) as the main materials, combined with 40 phr of silica, 2 phr of coupling agent Si-69, 2 phr of antioxidant RD, 1 phr of antioxidant 6PPD, and other additives. The thickness of the elastomer gradually decreases from the center to both ends, and the thickness at the center is greater than that at both ends, preferably 4mm-6mm.

[0017] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A novel heavy-duty truck tapered balance shaft bushing, comprising a cylindrical central frame and an outer frame, a middle frame, an inner frame, and an elastic body disposed on the inner and outer surfaces of each frame, all arranged parallel to one end of the central frame; the middle frame and the inner frame are sleeved on the central frame; the outer frame extends beyond the central frame in the axial direction; characterized in that: The inner skeleton is a porous titanium alloy layer and the side of the inner skeleton away from the elastomer is provided with a first Teflon coating. The side of the outer skeleton that connects with the heavy truck tapered balance shaft or balance end cap is provided with a second Teflon coating. The thickness of the elastomer in the axial direction gradually decreases from the center to both ends, and the thickness at the center is 4mm-6mm greater than the thickness at both ends.

2. The new type of heavy truck taper balance shaft bushing according to claim 1, characterized in that: The elastic body on the inner circumferential surface of the central skeleton has multiple longitudinal openings evenly distributed at intervals.

3. The new type of heavy truck taper balance shaft bushing according to claim 1, characterized in that: The outer frame has at least one notch on its inner and outer ring edges, and the outer frame has at least one groove on its end face.

4. The new type of heavy truck taper balance shaft bushing according to claim 3, characterized in that: Each groove on the end face of the exoskeleton extends from the center to the edge to form an extension portion, and the extension portion and the groove form an inverted T-shaped groove.

5. The new type of heavy truck taper balance shaft bushing according to claim 4, characterized in that: The free edges of the extensions on each groove are curved.

6. The new type of heavy truck taper balance shaft bushing according to claim 1, characterized in that: The outer skeleton, intermediate skeleton, and inner skeleton are all provided with a gap filled with elastomer.

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