Hydraulic bushing of magnesium alloy inner cage

Abstract

A hydraulic bushing of a magnesium alloy inner cage comprises an outer sleeve and a rubber main spring, the rubber main spring is pressed in the outer sleeve after being assembled, and a channel allowing liquid to flow through is formed in a connecting face between two hydraulic cavities. The two plastic check blocks are assembled on the outer sides of the two ends of the core shaft in an interference mode; the rubber main spring is formed by vulcanizing an inner pipe and a magnesium alloy inner cage through rubber, a plurality of positioning structures used for positioning during vulcanization are arranged on the outer surface of the rubber, and all the positioning structures are surrounded by the outer sleeve after the hydraulic bushing is assembled. According to the hydraulic bushing, the inner cage is made of magnesium alloy, so that the weight of the hydraulic bushing is reduced, and the cost is reduced. And moreover, the positioning structure during vulcanization is designed at the inner part surrounded by the outer sleeve, so that the magnesium alloy exposed at the positioning structure cannot be exposed in an operating environment after assembly is completed, and the defect that a magnesium alloy material is easy to corrode in a severe environment is overcome.

Description

Technical Field

[0001] The utility model relates to a hydraulic bushing, in particular to a hydraulic bushing with a magnesium alloy inner cage. Background Art

[0002] Hydraulic bushings are widely used vibration damping components in automobiles. Compared to traditional rubber bushings, they provide greater viscous damping within a specific frequency range, improving vehicle stability and safety. Hydraulic bushings primarily consist of a rubber main spring, a plastic runner, a stopper, an outer sleeve, and a viscous liquid. The rubber main spring is made by vulcanizing an inner tube and inner cage into a single piece of rubber. The inner cage, serving as the supporting structure, is typically made of aluminum alloy in current hydraulic bushings, as exemplified by utility model patents CN207554686U, entitled "An Adjustable Hydraulic Bushing for Automobiles," and CN220850516U, entitled "Hydraulic Bushing." While aluminum alloy inner cages offer superior performance, they are heavy and expensive, failing to meet current demands for lightweight and cost-effective vehicles. Utility Model Content

[0003] In view of the above problems, the present invention proposes a hydraulic bushing with a magnesium alloy inner cage, which is lighter and has lower cost than the current hydraulic bushing with an aluminum alloy inner cage.

[0004] The technical means adopted by the present invention to solve the above-mentioned problems are as follows: a hydraulic bushing with a magnesium alloy inner cage, comprising an outer sleeve and a rubber main spring. The rubber main spring is press-fitted into the outer sleeve after assembly, and a channel for liquid flow is provided at a connecting surface between two hydraulic chambers, and a bypass is provided at each of the two connecting surfaces between the two hydraulic chambers, each inclined toward a different hydraulic chamber. The utility model also includes plastic blocks, which are interference-fitted onto the outer sides of the core shaft at both ends. The rubber main spring is formed by vulcanizing an inner tube and an inner cage made of magnesium alloy with rubber. The outer surface of the rubber is provided with multiple positioning structures for positioning during vulcanization, and all positioning structures are surrounded by the outer sleeve after the hydraulic bushing is assembled. By enclosing all the positioning structures within the outer sleeve, the magnesium alloy material at the positioning structures is prevented from being exposed to the outside.

[0005] Furthermore, positioning structures are located around the two hydraulic chambers, and positioning structures are provided at the upper, lower, left and right edges of each hydraulic chamber to prevent the inner cage from being displaced when impacted by the rubber during vulcanization.

[0006] Furthermore, the hydraulic bushing includes a plastic flow channel mounted within the hydraulic chamber. The plastic flow channel is generally arc-shaped, with a length less than a semicircle. Lightening holes are provided at the upper, lower, left, and right edges of the plastic flow channel. The outer surface of the plastic flow channel also includes a flow channel and a through-hole-like flow channel hole. One end of the flow channel is connected to the flow channel hole, and the other end extends to the edge of the plastic flow channel and connects to the channel on the rubber main spring. By selecting flow channel holes in different positions, flow channels of different lengths can be designed.

[0007] Furthermore, there is one plastic flow channel, which is assembled at one hydraulic chamber.

[0008] Alternatively, there are two plastic runners, each installed in two hydraulic chambers, and the weight-reducing holes in the two plastic runners are of different sizes or positions. Each hydraulic chamber has a bump located at the location of the plastic runner weight-reducing hole, and the bumps in the two hydraulic chambers correspond to weight-reducing holes in different positions. The bumps serve as a preventative measure to prevent incorrect installation of the plastic runners.

[0009] Furthermore, anti-noise structures are provided at both ends of the rubber main spring.

[0010] Furthermore, the anti-noise structure is a plurality of protruding points.

[0011] Furthermore, the plastic stopper is also provided with an anti-abnormal noise structure on the two outer surfaces of the hydraulic bushing facing upward.

[0012] Furthermore, the abnormal noise prevention structure is a plurality of wavy convex strips.

[0013] Furthermore, the inner side wall of the plastic stopper is provided with a plurality of buckles with protruding surfaces, and the buckles are located at one end of the plastic stopper facing each other, and the plastic stopper is in interference contact with the rubber on the outer wall of the core shaft at the buckles, thereby preventing the plastic stopper from falling.

[0014] Furthermore, the inner side wall of the plastic stopper is also provided with a groove, and the rubber corresponding to the outer wall of the core shaft is provided with a rib that cooperates with the groove. The cooperation between the groove and the rib prevents the plastic stopper from being installed incorrectly.

[0015] The beneficial effects of the utility model are:

[0016] 1. By utilizing a magnesium alloy inner cage, this utility model reduces both the weight and cost of the hydraulic bushing. Furthermore, by designing the positioning structure during vulcanization within the outer casing, the exposed magnesium alloy in the positioning structure is not exposed to the operating environment after assembly, thus avoiding the vulnerability of magnesium alloy to corrosion in harsh environments. Furthermore, plastic stops are provided at both ends to limit the hydraulic bushing's upward position.

[0017] 2. The utility model can select the number of plastic flow channels and adjust the length of the entire flow channel according to demand, thereby meeting different hydraulic bushing performance requirements.

[0018] 3. The utility model provides an anti-noise structure on the rubber main spring and the plastic stopper to reduce the abnormal noise generated when the hydraulic bushing is deformed under a large load impact, thereby improving the comfort of the vehicle during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the hydraulic bushing in Example 1;

[0020] Figure 2 for Figure 1 Schematic diagram looking up;

[0021] Figure 3 for Figure 1 Schematic cross-sectional view;

[0022] Figure 4 This is a schematic diagram of the structure of the rubber main spring and the plastic stopper in Example 1;

[0023] Figure 5 This is a schematic diagram of the plastic stopper structure of Example 1;

[0024] Figure 6 This is a schematic diagram of the hydraulic bushing after the outer cover is removed in Example 2;

[0025] Figure 7 This is a cross-sectional schematic diagram of a hydraulic bushing according to the second embodiment;

[0026] Figure 8 This is a schematic diagram of the plastic flow channel structure of Example 2;

[0027] Figure 9 This is a schematic diagram of the structure of the rubber main spring and the plastic stopper in Example 2;

[0028] Figure 10 This is a schematic diagram of the rubber main spring structure of Example 3;

[0029] In the figure: 1. outer sleeve, 2. rubber main spring, 21. inner tube, 22. rubber, 23. inner cage, 24. hydraulic chamber, 201. bump, 202. bump, 203. rib, 204. positioning structure, 205. channel, 3. plastic flow channel, 31. flow channel, 32. flow channel hole, 33. weight-reducing hole, 4. plastic stopper, 41. ridge, 42. buckle, 43. groove. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the accompanying drawings. Example 1

[0031] like Figure 1-Figure 3 As shown, a hydraulic bushing with a magnesium alloy inner cage comprises an outermost outer shell 1, a rubber main spring 2 press-fitted into the outer shell 1, and annular plastic stoppers 4 mounted at each end. Two symmetrical hydraulic chambers 24 are formed between the outer shell 1 and the rubber main spring 2. The rubber main spring 2 is a single unit formed by vulcanizing an inner tube 21 and a magnesium alloy inner cage 23 with rubber 22. Two plastic stoppers 4 are mounted on the outer sides of the rubber 22 at each end of the inner tube 21.

[0032] Since the inner cage 23 is made of magnesium alloy, if the positioning structure during vulcanization is still set in a position that is not surrounded by the outer shell 1 after assembly, as in the case of an aluminum alloy inner cage, the exposed magnesium alloy material at the positioning structure will easily rust in a harsh environment, thereby affecting the performance and life of the hydraulic bushing. Figure 4 As shown, in this embodiment, positioning structures 204 are provided at the upper, lower, left, and right edges of each hydraulic chamber 24. For example, three positioning structures 204 are provided at each of the upper and lower edges. All the positioning structures 204 at the upper edge are "L"-shaped structures with their free ends protruding into the hydraulic chamber 24, and all the positioning structures 204 at the lower edge are inverted "L"-shaped structures with their free ends protruding into the hydraulic chamber 24. During vulcanization, the positioning structures 204 at the upper and lower edges cooperate to prevent the inner cage 23 from moving up and down. Furthermore, a positioning structure 204 is provided at each of the left and right edges. The positioning structure 204 at the left edge is "L"-shaped with its free ends facing the left side and the interior of the hydraulic chamber 24, respectively. The positioning structure 204 at the right edge is "L"-shaped with its free ends facing the right side and the interior of the hydraulic chamber 24, respectively. During vulcanization, the positioning structures 204 at the left and right edges cooperate to prevent the inner cage 23 from rotating in the circumferential direction. In this way, when the hydraulic bushing is assembled, all the positioning structures 204 are surrounded by the outer shell 1. Therefore, the exposed magnesium alloy material at the positioning structure 204 will not be exposed to the harsh operating environment, thereby extending the service life of the inner cage 23.

[0033] like Figure 4 As shown, a channel 205 is provided at a connecting surface of the two hydraulic chambers 24 , so that when the hydraulic bushing is impacted, the liquid in one hydraulic chamber 24 can flow along the channel 205 into the other hydraulic chamber 24 .

[0034] In order to prevent the plastic stopper 4 from falling off the rubber main spring 2, Figure 5 As shown, the inner wall of the plastic stopper 4 is provided with a plurality of protruding surface buckles 42, and the buckle 42 is located at one end of the plastic stopper 4 facing the other plastic stopper 4 after the plastic stopper 4 is assembled. When the plastic stopper 4 is assembled on the rubber 22 outside the inner tube 21, the plastic stopper 4 and the rubber 22 are interference fit, and the buckle 42 can be squeezed into the rubber 22 to ensure that the plastic stopper 4 will not fall off. At the same time, the inner wall of the plastic stopper 4 is also provided with a groove 43, as shown in FIG. Figure 1 As shown, ribs 203 are provided at corresponding positions of the rubber 22. During assembly, the ribs 203 cooperate with the grooves 43 to prevent the plastic stopper 4 from being installed incorrectly.

[0035] At the same time, if Figure 1 、 Figure 2 and Figure 5 As shown, the rubber 22 at both ends of the rubber main spring 2 and the two outer surfaces of the plastic stopper 4 facing the air direction are both equipped with anti-squeak structures. The anti-squeak structure on the rubber main spring 2 consists of multiple raised points 201 distributed along the raised areas of the rubber 22. When the rubber main spring 2 moves up and down and collides with the vehicle, the raised points 201 cushion the impact and thus reduce noise. The anti-squeak structure on the plastic stopper 4 consists of multiple wavy ridges 41. When the hydraulic bushing deforms in the air direction, the contact between the ridges 41 and the rubber 22 prevents abnormal noise. Example 2

[0036] The basic structure of this embodiment is the same as that of the first embodiment, except that this embodiment has different requirements on the distance of liquid flow. Figure 6-Figure 9 As shown, a plastic flow channel 3 is provided, which is assembled with the rubber main spring 2 and then pressed into the outer sleeve 1 together.

[0037] like Figure 8 As shown, the plastic flow channel 3 is in an arc shape smaller than a semicircle as a whole, and a flow channel 31 is provided on its outer surface. The flow channel 31 is located at one end of the plastic flow channel 3 close to the middle and is a flow channel hole 32 connected to the hydraulic chamber 24 on the inner side of the plastic flow channel 3. The other end of the flow channel 31 extends to the circumferential edge of the plastic flow channel 3, and as shown in FIG. Figure 6 As shown, when the plastic flow channel 3 is assembled to the rubber main spring 2, the flow channel 3 is connected to the channel 205, extending the distance the liquid flows. Moreover, the length of the flow channel 31 can be adjusted by selecting the flow channel hole 32 at different positions, thereby adjusting the distance the liquid flows.

[0038] In addition, if Figure 8 As shown, the plastic flow channel 3 is provided with weight-reducing holes 33 at the four edges of the upper, lower, left and right sides. Figure 9As shown, a bump 202 is provided at the bottom edge of the hydraulic chamber 24, into which the plastic runner 3 is assembled. This bump 202 aligns with a weight-reducing hole 33 located in the middle of the lower edge of the plastic runner 3 to prevent incorrect assembly of the plastic runner 3. Therefore, the weight-reducing hole 33 on the upper edge of the plastic runner 3 and the shock-absorbing hole 33 on the lower edge must not be arranged symmetrically along the center to prevent the shock-absorbing hole 33 from matching the bump 202 even if the plastic runner 3 is turned upside down. Example 3

[0039] The difference between this embodiment and the above embodiment is that: in this embodiment, the liquid is required to flow a longer distance, so two plastic flow channels 3 are used, such as Figure 10 As shown, each hydraulic chamber 24 has a protrusion 202 at its lower edge. Furthermore, not only are the protrusions 202 located at different positions in the two hydraulic chambers 24, but the weight-reducing holes 33 in the two plastic flow channels 3 are also located at different positions. Alternatively, the protrusions 202 in the two hydraulic chambers 24 are of different sizes, and the weight-reducing holes 33 in the two plastic flow channels 3 are also of different sizes. In other words, the weight-reducing holes 33 in the plastic stopper 4 assembled in one hydraulic chamber 24 do not align with the protrusion 202 in the other hydraulic chamber 24, ensuring that the two plastic flow channels 3 are not installed reversed.

[0040] In the above embodiment, Figure 6 and Figure 10 As shown, a bypass 25 is provided at each of the two connecting surfaces between the two hydraulic chambers 24, and the two bypasses 25 are inclined toward different hydraulic chambers 24. When subjected to a significant impact, the liquid in one hydraulic chamber 24 can flow to the other hydraulic chamber 24 through one of the bypasses 25. By providing the bypasses 25 in different orientations on either side, the length of the bypasses 25 is increased, their rigidity is reduced, and the pressure differential adjustment range of the liquid chambers 24 is expanded. When the pressure differential between the two sides is small, the bypasses 25 can be opened to relieve pressure, thereby reducing the pressure differential between the two sides and effectively protecting the rubber chamber walls from damage.

[0041] In the above embodiments, the descriptions of up, down, left, and right refer to directions when facing the corresponding drawings.

[0042] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of protection of the present invention, and the scope of protection of the present invention should be defined by the claims.

Claims

1. A hydraulic bushing with a magnesium alloy inner cage, comprising an outer sleeve and a rubber main spring, the rubber main spring being press-fitted into the outer sleeve after assembly, and a channel for liquid flow being provided at a connecting surface between two hydraulic chambers; characterized in that: A bypass is provided at each of the two connecting surfaces between the two hydraulic chambers, each of which is inclined toward a different hydraulic chamber; it also includes plastic blocks, which are interference fitted on the outside of the two ends of the core shaft; the rubber main spring is made by vulcanizing the inner tube and the inner cage of magnesium alloy material with rubber, and a plurality of positioning structures for positioning during vulcanization are provided on the outer surface of the rubber, and all the positioning structures are surrounded by the outer sleeve after the hydraulic bushing is assembled.

2. The hydraulic bushing of the magnesium alloy inner cage according to claim 1, characterized in that: The positioning structure is located around the two hydraulic chambers, and positioning structures are provided at the upper, lower, left and right edges of each hydraulic chamber.

3. The hydraulic bushing of the magnesium alloy inner cage according to claim 1, characterized in that: The hydraulic bushing also includes a plastic flow channel assembled at the hydraulic chamber. The plastic flow channel is an arc with an arc length less than a semicircle as a whole, and weight-reducing holes are provided at the upper, lower, left and right edges of the plastic flow channel. A flow channel and a through-hole-shaped flow channel hole are also provided on the outer surface of the plastic flow channel. One end of the flow channel is connected to the flow channel hole, and the other end extends to the edge of the plastic flow channel and is connected to the channel on the rubber main spring.

4. The hydraulic bushing of the magnesium alloy inner cage according to claim 3, characterized in that: There is one plastic flow channel, which is assembled at one hydraulic chamber.

5. The hydraulic bushing of the magnesium alloy inner cage according to claim 3, characterized in that: There are two plastic flow channels, which are respectively assembled at two hydraulic chambers, and the sizes or positions of the weight-reducing holes of the two plastic flow channels are not exactly the same; each hydraulic chamber is provided with a protrusion at the position of the weight-reducing hole of the plastic flow channel, and the positions of the weight-reducing holes corresponding to the protrusions of the two hydraulic chambers are different.

6. The hydraulic bushing of the magnesium alloy inner cage according to claim 1, characterized in that: Both ends of the rubber main spring are provided with anti-noise structures, and the plastic stoppers are also provided with anti-noise structures on the two outer surfaces of the hydraulic bushing facing upward.

7. The hydraulic bushing of the magnesium alloy inner cage according to claim 6, characterized in that: The anti-noise structure is composed of multiple protruding points.

8. The hydraulic bushing of the magnesium alloy inner cage according to claim 6, characterized in that: The anti-noise structure is composed of multiple wave-shaped convex strips.

9. The hydraulic bushing of the magnesium alloy inner cage according to claim 1, characterized in that: The inner wall of the plastic stopper is provided with multiple buckles with protruding surfaces, and the buckles are located at one end of the plastic stopper facing each other. The plastic stopper is in interference contact with the rubber on the outer wall of the core shaft at the buckle to prevent the plastic stopper from falling.

10. The hydraulic bushing of the magnesium alloy inner cage according to claim 1, characterized in that: The inner side wall of the plastic stopper is also provided with a groove, and the rubber corresponding to the outer wall of the core shaft is provided with a convex rib that matches the groove.

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