A one-piece bidirectional hydraulic bushing

Abstract

The application discloses a whole type bidirectional hydraulic bushing, which comprises an outer tube, a flow channel body and a rubber main spring, wherein the rubber main spring is a structure that an inner tube and an inner cage are vulcanized into a whole by rubber, and four independent liquid chambers, namely a left upper chamber, a right upper chamber, a left lower chamber and a right lower chamber, are arranged at two symmetrical outer sides of the rubber main spring; the flow channel body is two identical halves, each of which is semicircular, and is symmetrically arranged at two empty sides of the rubber main spring to form a whole annular shape, and an outer side wall of the flow channel body is provided with two independent flow channels, one of which connects the left upper chamber and the right lower chamber, and the other of which connects the right upper chamber and the left lower chamber. The application can realize bidirectional damping effects in the empty direction and the axial direction, can reduce the total height of the hydraulic bushing as much as possible, and can expand the use place of the hydraulic bushing. The hydraulic bushing adopts a whole type structure, so that the process is less, the manufacturing cost is lower, and the efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to a hydraulic bushing, in particular to a one-piece bidirectional hydraulic bushing with multiple liquid chambers. BACKGROUND

[0002] Hydraulic bushings are widely used in automobiles as a damping component. Compared with traditional rubber bushings, hydraulic bushings can provide greater viscous damping characteristics in a specific frequency range, improving the overall vehicle NVH performance. A hydraulic bushing mainly consists of a rubber main spring, a plastic flow channel, a stop block, an outer tube and damping liquid. The rubber main spring is composed of an inner sleeve, an inner cage and rubber, and the three are connected by adhesive coated on the inner sleeve and the inner cage. Common hydraulic bushings have two liquid chambers, distributed on the left and right sides of the hollow direction. During the operation of the bushing, the damping liquid in the left and right chambers flows between the chambers, thereby achieving the damping characteristics of the hollow single direction.

[0003] To achieve bidirectional damping characteristics in the axial and hollow directions, the general approach is to make the structure between the inner sleeve and the outer sleeve into a split type, adding upper and lower chambers and flow channels based on the original bushing structure. For example, the utility model patent with application number CN202021271499.7 and the name "Bidirectional high-damping hydraulic auxiliary frame bushing and automobile", the invention application with application number CN202311682647.2 and the name "Bidirectional damping hydraulic bushing and its assembly method", all adopt this split structure. However, this structure has the disadvantages of large product structure, heavy weight, high cost and limited adjustment space. SUMMARY

[0004] The present application proposes a one-piece bidirectional hydraulic bushing to solve the current problems, which uses a one-piece structure to achieve bidirectional damping characteristics in the axial and hollow directions, and has a limiting function in both directions.

[0005] The technical means adopted by the present application to solve the above problems is: a one-piece bidirectional hydraulic bushing, comprising an outer tube, a flow channel body and a rubber main spring, wherein the rubber main spring is a structure in which the inner tube and the inner cage are vulcanized into a whole by rubber, and four independent liquid chambers are provided on the symmetrically two outer sides of the rubber main spring, namely the left upper chamber, the right upper chamber, the left lower chamber and the right lower chamber; the flow channel body is two identical halves, each being semicircular, symmetrically installed on the two sides of the rubber main spring in the hollow direction to form a whole annular shape, and the outer side wall of the flow channel body is provided with two independent flow channels, one connecting the left upper chamber and the right lower chamber, and the other connecting the right upper chamber and the left lower chamber. By symmetrically arranging the four independent liquid chambers, namely the upper, lower, left and right chambers, and the two independent flow channels, the four liquid chambers are connected to each other in pairs, achieving bidirectional damping effect in the hollow and axial directions.

[0006] Further, the rubber main spring is designed as a sheet structure to form a baffle between the left upper chamber and the left lower chamber and between the right upper chamber and the right lower chamber, and the baffle is used to separate the left upper chamber and the left lower chamber and the right upper chamber and the right lower chamber, so that two layers of chambers are formed in the axial direction.

[0007] Further, a rib is arranged at the middle of the inner cage towards the direction of the baffle, and the rib provides support for the baffle.

[0008] Further, a protrusion is arranged at the middle of the inner tube towards the outer periphery, and the rubber wraps the protrusion and the rib to form the baffle, and the protrusion and the rib cooperate to ensure the strength of the baffle.

[0009] Further, two independent flow channels are arranged outside each flow channel body, one end of each flow channel is connected to a liquid chamber, and the other end is connected to one end of a flow channel of another flow channel body. One shorter flow channel of one flow channel body is connected to one shorter flow channel of another flow channel body to form one longer flow channel, and the two longer flow channels connect two liquid chambers farthest apart.

[0010] Further, each flow channel of one flow channel body is in L shape, the two flow channels are centrally symmetrical, and the openings of the two flow channels in the circumferential direction are located on the same radial section. When the two flow channel bodies are installed outside the rubber main spring, the flow channels of one flow channel body can be connected to the flow channels of another flow channel body.

[0011] Further, a groove is arranged at the middle of the inner side of the flow channel body in the circumferential direction, and the baffle is inserted into the groove after the flow channel body is installed outside the rubber main spring. The groove and the baffle cooperate to complete the sealing isolation between the upper and lower chambers.

[0012] Further, the flow channel body itself is in a centrally symmetrical structure, and no mistake prevention problem needs to be considered during installation.

[0013] Further, the flow channel body is further provided with a stop hole, and a stop block is arranged in the stop hole. The linear size of the bushing in the hollow direction and the nonlinearity of the second half of the force-displacement curve are ensured.

[0014] Further, the stop hole on each flow channel body is two, and each stop hole is arranged at the position corresponding to one liquid chamber. When a stop block is arranged in each stop hole, one stop block is located in one liquid chamber.

[0015] The beneficial effects of the present application are:

[0016] 1. The hydraulic bushing of the present application adopts an integral structure, has fewer processes, lower manufacturing cost and higher efficiency.

[0017] 2. The hydraulic bushing of the present application can reduce the total height of the hydraulic bushing as much as possible, and expand the use of the hydraulic bushing, by setting four liquid chambers of upper, lower, left and right symmetrically on both sides of the whole rubber main spring, and realizing the damping effect in both axial and radial directions.

[0018] 3. The hydraulic bushing of the present application can form four independent liquid chambers by setting the protrusions on the inner tube, setting the ribs on the inner cage, connecting the protrusions and the ribs into baffles with rubber, separating the upper left chamber from the lower left chamber and the upper right chamber from the lower right chamber with the baffles, and setting the grooves on the inner side of the flow passage body to cooperate with the baffles. Meanwhile, the structure and size of the protrusions, the ribs and the baffles can be adjusted according to the need, so as to adjust the dynamic characteristics of the bushing.

[0019] 4. The hydraulic bushing of the present application can adjust the structure, number and distribution form of the stop blocks according to the need, and select the appropriate position in the radial direction to limit the movement. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the hydraulic bushing of the first embodiment.

[0021] Figure 2 It is a cross-sectional view of the hydraulic bushing of the first embodiment. Figure 1 It is a structural schematic diagram after removing the outer tube.

[0022] Figure 3 It is a structural schematic diagram after removing the flow passage body. Figure 2 It is a structural schematic diagram after removing the flow passage body.

[0023] Figure 4 It is a structural schematic diagram of the rubber main spring of the first embodiment.

[0024] Figure 5 It is a structural schematic diagram of the inner cage of the first embodiment.

[0025] Figure 6 It is a structural schematic diagram of the inner tube of the first embodiment.

[0026] Figure 7 It is a structural schematic diagram of the flow passage body of the first embodiment.

[0027] Figure 8 It is another angle view. Figure 7 It is another angle view.

[0028] In the figure: 100. Upper left chamber, 200. Upper right chamber, 300. Lower left chamber, 400. Lower right chamber, 1. Inner tube, 11. Protrusion, 2. Rubber, 3. Inner cage, 31. Rib, 4. Flow passage body, 41. Flow passage, 42. Groove, 43. Stop hole, 5. Stop block, 6. Outer tube, 7. Baffle. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, 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 in the drawings. Example 1

[0030] An integral bidirectional hydraulic bushing, such as Figure 1 As shown, the system includes an inner tube 1, a rubber 2, an inner cage 3, a flow channel body 4, a stop block 5, and an outer tube 6. The inner tube 1, rubber 2, and inner cage 3 are vulcanized into a single rubber main spring. Two axially arranged liquid chambers are provided on each side of the rubber main spring: an upper left chamber 100, an upper right chamber 200, a lower left chamber 300, and a lower right chamber 400. Each chamber is filled with damping fluid (not shown in the figure), and each chamber has a stop block 5 for limiting movement.

[0031] like Figure 6 As shown, the inner tube 1 has a ring of outwardly protruding protrusions 11 on its outer periphery at the axial center, correspondingly, as... Figure 5 As shown, the inner cage 3 has ribs 31 arranged circumferentially in the middle of the open section, therefore, as Figure 4 As shown, after vulcanization into a rubber main spring, a baffle 7 is formed at the middle of each of the two open sides of the rubber main spring, dividing the space on both sides of the open side of the rubber main spring into upper and lower layers. Furthermore, a protruding rubber 2 is also provided at the middle of the outer side of the rubber main spring along the real direction, connecting the two baffles 7 to form a ring-shaped protruding structure. Figure 8 As shown, a circumferential groove 42 is provided in the middle of the inner side of the flow channel body 4. After the two flow channel bodies 4 are assembled, a complete annular groove 42 is formed. When the flow channel body 4 is assembled to the rubber main spring, the entire annular protrusion of the rubber main spring is inserted into the groove 42 of the flow channel body 4, forming a complete sealing structure. With the contact fit between the rubber at the two lateral ends of the baffle and the rubber main spring, the flow channel body 4 and the rubber main spring together enclose the open space to form the upper left chamber 100, the upper right chamber 200, the lower left chamber 300, and the lower right chamber 400.

[0032] At the same time, such as Figure 7 and Figure 8 As shown, in this embodiment, the two identical flow channel bodies 4 adopt a centrally symmetrical structure, eliminating the need to consider incorrect installation during setup. Figure 8 As shown, a stop hole 43 is provided on each of the upper and lower sides of the groove 42. A stop block 5 is installed in one stop hole 43. When a stop block 5 is installed in each stop hole 43, as shown... Figure 3As shown, four stop blocks 5 are needed in total, but in actual use, the structure, number and distribution of the stop blocks 5 can be adjusted as needed. Figure 7 As shown, the outer side wall of the stop block 5 is provided with two independent flow channels 41, each of which is an L-shaped structure. One end of each flow channel 41 is in communication with the inner side of the flow channel body 4 to communicate with the liquid chamber at the inner side of the flow channel body 4, and the other end extends to the edge of the side surface of the flow channel body 4. In this way, when the two flow channel bodies 4 are combined into a ring shape, the flow channel 41 extending to the edge of the side surface of the flow channel body 4 can be connected to the flow channel 41 of the other flow channel body 4, forming a complete flow channel 41 connecting the two liquid chambers. Specifically, for one flow channel body 4, one flow channel 41 is an inverted L-shaped structure, which is in communication with the left upper chamber 100 or the right upper chamber 200 at one axial end, and is connected to the flow channel 41 of the other flow channel body 4 at the circumferential end; the other flow channel 41 is an inverted L-shaped structure, which is in communication with the left lower chamber 300 or the right lower chamber 400 at one axial end, and is also connected to the flow channel 41 of the other flow channel body 4 at the circumferential end. Moreover, the openings of the two flow channels 41 in the circumferential direction are located in the same radial section, and after the two flow channel bodies 4 are combined into a ring shape, the flow channels 41 of the two flow channel bodies 4 are connected to form a complete flow channel 41. Figure 2 As shown, the end of the inverted L-shaped flow channel 41 on one flow channel body 4 is connected to the end of the inverted L-shaped flow channel 41 on the other flow channel body 4, and the two groups of flow channels respectively communicate the left upper chamber 100 with the right lower chamber 400 and the right upper chamber 200 with the left lower chamber 300.

[0033] Finally, when the assembled flow channel body 4, stop block 5 and rubber main spring are press-fitted into the outer tube 6, the left upper chamber 100 and the left lower chamber 300, and the right upper chamber 200 and the right lower chamber 400 are independent of each other, and the left upper chamber 100 and the right lower chamber 400, and the right upper chamber 200 and the left lower chamber 300 are respectively connected by the two independent flow channels 41 on the outer side wall of the flow channel body 4. The other structures of the hydraulic bushing do not need to be changed too much and too complex compared with the current conventional hydraulic bushing structure, so the manufacturing process is relatively simple and the cost is relatively low.

[0034] The mechanism of the hydraulic bushing to achieve the effect of bidirectional damping in the axial and radial directions is as follows:

[0035] When the outer sleeve is fixed and the mandrel moves upward, the lower chamber is extruded, pushing the damping liquid in the lower chamber to move upward, so the damping liquid in the left lower chamber 300 flows to the right upper chamber 200 through the flow channel 41, and the damping liquid in the right lower chamber 400 flows to the left upper chamber 100 through the flow channel 41, thereby achieving the effect of axial damping.

[0036] When the outer sleeve is fixed and the mandrel moves to the left, the left chamber is squeezed, pushing the damping liquid in the left chamber to move to the right, thus, the damping liquid in the lower left chamber 300 flows to the upper right chamber 200 through the flow channel 41, and the damping liquid in the upper left chamber 100 flows to the lower right chamber 400 through the flow channel 41, thereby achieving the damping effect in the empty direction.

[0037] In the flow process of the damping liquid, each flow is almost from the leftmost side to the rightmost side, and from the lowermost end to the uppermost end, the flow distance is long, and the buffering effect is greater.

[0038] The above examples are only for illustrating the present application, and are not a limitation on the present application. Those skilled in the art can make various changes or transformations without departing from the spirit and scope of the present application, and all equivalent technical solutions should belong to the protection scope of the present application, which should be defined by the claims.

Claims

1. A one-piece bidirectional hydraulic bushing comprising an outer tube (6), a flow channel body (4) and a rubber main spring, wherein the rubber main spring is a structure in which an inner tube (1) and an inner cage (3) are vulcanized into one piece by rubber (2), characterized in that: The rubber main spring is provided with four independent liquid chambers at two symmetrical outer sides, namely a left upper chamber (100), a right upper chamber (200), a left lower chamber (300) and a right lower chamber (400); the flow channel body (4) is identical and each is semicircular, symmetrically installed at the two empty sides of the rubber main spring to form an integral ring, and the outer side wall of the flow channel body (4) is provided with two independent flow channels (41), one connecting the left upper chamber (100) and the right lower chamber (400), and the other connecting the right upper chamber (200) and the left lower chamber (300); The rubber main spring is designed as a sheet structure to form a baffle (7) between the left upper chamber (100) and the left lower chamber (300) and between the right upper chamber (200) and the right lower chamber (400), and the baffle (7) separates the left upper chamber (100) and the left lower chamber (300) and the right upper chamber (200) and the right lower chamber (400); The inner cage (3) is provided with a rib (31) at the middle of the two empty sides, which is in the same direction as the baffle (7); The inner tube (1) is provided with a protrusion (11) at the middle of the outer side, and the rubber (2) wraps the protrusion (11) and the rib (31) to form the baffle (7); Each flow channel body (4) is provided with two independent flow channels (41), and each flow channel (41) is connected to one liquid chamber at one end and connected to one flow channel (41) of the other flow channel body (4) at the other end; The middle of the inner side of the flow channel body (4) is provided with a groove (42) in the circumferential direction, and the baffle (7) is inserted into the groove (42) after the flow channel body (4) is installed to the rubber main spring.

2. The one-piece bi-directional hydraulic bushing of claim 1, wherein: Each flow channel (41) on one flow channel body (4) is L-shaped, and the two flow channels (41) are centrally symmetrical, and the openings of the two flow channels (41) in the circumferential direction are located on the same radial section.

3. The one-piece bi-directional hydraulic bushing of claim 1, wherein: The flow channel body (4) itself is a centrally symmetrical structure.

4. The one-piece bi-directional hydraulic bushing of claim 1, wherein: The flow channel body (4) is further provided with a stop hole (43), and the stop hole (43) is provided with a stop block (5).

5. The one-piece bi-directional hydraulic bushing of claim 4, wherein: Each flow channel body (4) is provided with two stop holes (43), and each stop hole (43) is arranged at the position of a corresponding liquid chamber.

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