Bushing assembly for hydraulic oil cylinder

Abstract

The bushing assembly for the hydraulic oil cylinder comprises an inner bushing, an outer bushing and a rubber sleeve which is arranged between the inner bushing and the outer bushing and enables the inner bushing and the outer bushing to be elastically connected, the inner bushing, the outer bushing and the rubber sleeve are coaxially arranged, a through hole is formed in the center of the inner bushing in the axial direction, and the rubber sleeve is arranged on the outer wall of the inner bushing in a sleeving mode in the radial direction. The outer lining sleeves the outer wall of the rubber sleeve in the radial direction, the rubber sleeve and the outer lining are integrally formed in a vulcanized mode, and the situation that the rubber sleeve and the outer lining are separated in the use process and affect use is avoided; at the moment, the neck bush absorbs counter-acting force through deformation, the counter-acting force is prevented from acting on the cab bottom plate, and therefore abnormal sound is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic devices, in particular to a bushing assembly for a hydraulic cylinder. Background Art

[0002] In the field of medium and heavy trucks (medium and heavy-duty trucks), abnormal noises often occur during the driving of the cab, which is particularly obvious when the new energy commercial vehicle cylinder is driving. The hydraulic cylinder is a key component used to drive the cab to flip. There is an installation point on the piston rod of the hydraulic cylinder that is connected to the cab. In the existing technology, there are mainly two forms of the position design of the installation point on the cylinder. The first form is as shown in the reference Figure 1 shown, its structure includes a bracket 6', a mounting pin 5', a bolt 4', a polyurethane washer 2' and a nut 3'. The mounting pin 5' is connected in the bracket 6' through the bolt 4' and the nut 3'. At the installation point position, two polyurethane washers 2' or rubber rings will be installed to play a shock-absorbing role. The second form is as shown in the reference Figure 2 shown, which is an improvement on the first form, adding a metal bushing 1' to solve the problem of uneven load on the cylinder on the whole vehicle. However, the above two solutions have the following problems. First: during the lifting process of the cab, the cylinder will crush the polyurethane washer 2', and the metal bushing 1' or the mounting pin 5' will rub against the upper part of the piston rod joint 7', forming abnormal noises. Second: when the whole vehicle is driving on an uneven road surface, when the polyurethane washer 2' is too soft, it cannot prevent the cylinder bushing or the mounting pin 5' from colliding with the piston rod joint 7'; when the polyurethane washer 2' is too hard, the damping force of the cylinder will be directly transmitted to the cab floor, causing abnormal noises in the whole vehicle driving, and it is easier to cause abnormal noises after the polyurethane washer 2' is crushed. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a bushing assembly for a hydraulic cylinder, which has a simple and reasonable structure, is easy to operate, and can effectively absorb the damping when the cylinder floats, preventing abnormal noises from being caused.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A bushing assembly for a hydraulic cylinder includes an inner bushing, an outer bushing, and a rubber sleeve disposed between the inner bushing and the outer bushing to elastically connect them. The inner bushing, the outer bushing, and the rubber sleeve are all coaxially arranged. A through hole is axially provided along the center of the inner bushing. The rubber sleeve is radially sleeved on the outer wall of the inner bushing, and the outer bushing is radially sleeved on the outer wall of the rubber sleeve. The rubber sleeve and the outer bushing are integrally formed by vulcanization.

[0006] Further, the rubber sleeve is provided in a hollow shape.

[0007] Further, the rubber sleeve and the inner lining sleeve are integrally formed by vulcanization.

[0008] Further, a plurality of buffer holes penetrating the rubber sleeve are provided in the circumferential direction of the rubber sleeve.

[0009] Further, the buffer holes penetrate axially along the rubber sleeve.

[0010] Further, the buffer holes are arranged in an arc shape.

[0011] Further, four buffer holes are provided on the rubber sleeve, and the four buffer holes are symmetrically arranged in pairs with respect to the rubber sleeve.

[0012] Further, the cross-sectional areas of two symmetrically arranged buffer holes are smaller than those of the other two symmetrically arranged buffer holes.

[0013] Further, the rubber sleeve is provided in a solid shape.

[0014] Further, the rubber sleeve and the inner lining sleeve are in clearance fit, and the inner lining sleeve can rotate relative to the rubber sleeve.

[0015] The beneficial effects of the present utility model are as follows: For the bushing assembly for a hydraulic cylinder of the present utility model, it can absorb the damping during the floating of the cylinder when the vehicle is bumping, and during the lifting and falling process, it will not crush the bushing assembly, and can well solve the problem that abnormal noises are likely to occur on the cab floor during the driving of the whole vehicle, improving the driving comfort and the overall performance of the vehicle; during the driving process, the piston rod of the hydraulic cylinder will float with the shaking of the cab. When the cab floats downward, the piston rod will float downward accordingly, and the hydraulic oil inside the cylinder barrel will generate an upward reverse force and transmit it to the bushing assembly. At this time, the inner lining sleeve will absorb the reverse force through deformation, preventing this force from pushing up the cab floor and thus avoiding abnormal noises; when the cab floats upward, the piston rod will float upward accordingly, and the hydraulic oil inside the cylinder barrel will generate a downward reverse force and transmit it to the bushing assembly. At this time, the inner lining sleeve will absorb the reverse force through deformation, preventing this force from pulling down the cab floor and thus avoiding abnormal noises.

[0016] There are two connection methods for the inner lining sleeve and the rubber sleeve. In the first connection method, the rubber sleeve is provided in a hollow shape. Specifically, the rubber sleeve and the inner lining sleeve are integrally formed by vulcanization to prevent separation during use and affect the performance. In addition, the stiffness of the rubber sleeve can be adjusted according to the damping value of the oil cylinder, so as to effectively absorb the damping when the oil cylinder floats and prevent abnormal noise. At the same time, when the lifting and falling angle of the cab rotates, the inner lining sleeve can twist and rotate accordingly and can return to its original state after rotation without being damaged, improving its adaptability and durability. In the second connection method, the rubber sleeve is provided in a solid shape, making the structure of the rubber sleeve more stable and better able to resist external impacts and pressures during use and not easily being crushed. Specifically, the rubber sleeve and the inner lining sleeve are in clearance fit, and the inner lining sleeve can rotate relative to the rubber sleeve, enabling the inner lining sleeve to flexibly respond to the damping change of the oil cylinder. At the same time, the rubber stiffness can be adjusted according to the oil cylinder damping value, effectively absorbing the damping when the oil cylinder floats and preventing abnormal noise. Description of the Drawings

[0017] Figure 1 is a schematic cross-sectional structure view of the first form of the mounting point on the oil cylinder in the prior art;

[0018] Figure 2 is a schematic cross-sectional structure view of the second form of the mounting point on the oil cylinder in the prior art;

[0019] Figure 3 is a schematic structure view of the present utility model;

[0020] Figure 4 is a schematic cross-sectional structure view of the present utility model;

[0021] Figure 5 is a schematic exploded structure view of the present utility model;

[0022] Figure 6 is a schematic structure view of the rubber sleeve;

[0023] Figure 7 is a schematic structure view of the present utility model in the working state.

[0024] Figures 1-7 In the figure: 1', metal lining sleeve; 2', polyurethane washer; 3', nut; 4', bolt; 5', mounting pin; 6', bracket; 7', piston rod joint; 1, inner lining sleeve; 2, outer lining sleeve; 3, rubber sleeve; 11, through hole; 31, buffer hole; 4, cylinder barrel; 5, piston rod; 6, piston rod joint. Detailed Embodiments

[0025] The present utility model will be further described below with reference to the drawings.

[0026] As Figures 3-7A bushing assembly for a hydraulic cylinder is shown. The bushing assembly is connected to the piston rod 5 of the hydraulic cylinder through a piston rod joint 6, providing a more stable connection method. Specifically, the hydraulic cylinder includes a cylinder barrel 4. A piston and a piston rod 5 are movably arranged in the cylinder barrel 4. The piston and the piston rod 5 divide the inner cavity of the cylinder barrel 4 into a rod chamber and a rodless chamber. The inner cavity of the cylinder barrel 4 is filled with hydraulic oil. Refer to Figure 7 , one end of the piston rod 5 extends out of the cylinder barrel 4, and the end of the piston rod 5 is connected with the bushing assembly through a piston rod joint 6. The bushing assembly includes an inner bushing 1, an outer bushing 2, and a rubber sleeve 3 arranged between the inner bushing 1 and the outer bushing 2 to elastically connect them. The inner bushing 1, the outer bushing 2, and the rubber sleeve 3 are all coaxially arranged. A through hole 11 is axially provided in the center of the inner bushing 1. An installation pin shaft and a bolt are connected in the through hole 11 and are connected to the cab of the vehicle through the installation pin shaft and the bolt. The rubber sleeve 3 is radially sleeved on the outer wall of the inner bushing 1. Preferably, in this embodiment, the upper and lower ends of the inner bushing 1 protrude from the rubber sleeve 3, which can better bear the pressure. The outer bushing 2 is radially sleeved on the outer wall of the rubber sleeve 3. The rubber sleeve 3 and the outer bushing 2 are vulcanized and integrally formed to prevent separation during use and affect the use. During driving, the piston rod 5 will float with the shaking of the cab. When the cab floats downward, the piston rod 5 will float downward accordingly, and the hydraulic oil inside the cylinder barrel 4 will generate an upward reaction force and transmit it to the bushing assembly. At this time, the inner bushing 1 will absorb the reaction force through deformation to prevent this force from pushing up the cab floor, thereby avoiding generating abnormal noises. When the cab floats upward, the piston rod 5 will float upward accordingly, and the hydraulic oil inside the cylinder barrel 4 will generate a downward reaction force and transmit it to the bushing assembly. At this time, the inner bushing 1 will absorb the reaction force through deformation to prevent this force from pulling down the cab floor, thereby avoiding generating abnormal noises. The bushing assembly for a hydraulic cylinder of the present utility model can absorb the damping during the floating of the cylinder during driving bumps, and during the lifting and falling process, it will not crush the bushing assembly, and can well solve the problem that abnormal noises are likely to appear on the cab floor during the whole vehicle driving, improving the driving comfort and the overall performance of the vehicle.

[0027] Preferably, in this embodiment, there are two connection methods between the inner bushing 1 and the rubber sleeve 3. Of course, in other embodiments, there can also be other connection methods. In the first connection method, the rubber sleeve 3 is arranged in a hollow shape. Specifically, the rubber sleeve 3 and the inner bushing 1 are vulcanized and integrally formed to prevent separation during use and affect the use. In addition, the stiffness of the rubber sleeve 3 can be adjusted according to the damping value of the cylinder, so that the damping during the floating of the cylinder can be effectively absorbed to prevent abnormal noises. At the same time, when the cab rotates during the lifting and falling angle, the inner bushing 1 can twist and rotate accordingly and can return to its original state after rotation without being damaged, improving its adaptability and durability.

[0028] Preferably, in this embodiment, refer to Figure 6 , a plurality of buffer holes 31 penetrating through the rubber sleeve 3 are provided in the circumferential direction of the rubber sleeve 3. Preferably, in this embodiment, the buffer holes 31 penetrate along the axial direction of the rubber sleeve 3. Preferably, in this embodiment, the buffer holes 31 are arranged in an arc shape, which can better disperse pressure when subjected to external forces, thereby improving its impact resistance. The buffer holes 31 can easily form low-rigidity parts, improving softness, so that when dealing with different pressures and impacts, it can exhibit better elasticity and deformation ability.

[0029] Preferably, in this embodiment, four buffer holes 31 are provided on the rubber sleeve 3, and the four buffer holes 31 are symmetrically arranged in pairs with respect to the rubber sleeve 3, which is not only beautiful, but also can achieve uniform distribution when stressed, effectively dispersing the pressure in all directions. Preferably, in this embodiment, the cross-sectional areas of two symmetrically arranged buffer holes 31 are smaller than those of the other two symmetrically arranged buffer holes 31, and the performance of the rubber sleeve 3 can be adjusted according to actual needs to adapt to different use environments and requirements. Of course, in other embodiments, the number and cross-sectional area of the buffer holes 31 can be adjusted accordingly according to actual needs.

[0030] In the second connection method, the rubber sleeve 3 is provided in a solid shape, making the structure of the rubber sleeve 3 more stable, and it can better resist external impacts and pressures during use and is not easily damaged. Specifically, the rubber sleeve 3 and the inner lining sleeve 1 are in clearance fit, and the inner lining sleeve 1 can rotate relative to the rubber sleeve 3, enabling the inner lining sleeve 1 to flexibly respond to the damping change of the oil cylinder. At the same time, the rubber stiffness can be adjusted according to the oil cylinder damping value, effectively absorbing the damping when the oil cylinder floats and preventing abnormal noises.

[0031] The above is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A bushing assembly for a hydraulic cylinder, characterized in that: It includes an inner bushing (1), an outer bushing (2), and a rubber sleeve (3) disposed between the inner bushing (1) and the outer bushing (2) to elastically connect them. The inner bushing (1), the outer bushing (2), and the rubber sleeve (3) are all coaxially arranged. A through hole (11) is axially provided along the center of the inner bushing (1). The rubber sleeve (3) is radially sleeved on the outer wall of the inner bushing (1). The outer bushing (2) is radially sleeved on the outer wall of the rubber sleeve (3). The rubber sleeve (3) and the outer bushing (2) are integrally formed by vulcanization. The rubber sleeve (3) is in clearance fit with the inner bushing (1), and the inner bushing (1) can rotate relative to the rubber sleeve (3).

2. The bushing assembly for a hydraulic cylinder according to claim 1, wherein: The rubber sleeve (3) is provided in a hollow shape.

3. A bushing assembly for a hydraulic cylinder according to claim 2, characterized in that: The rubber sleeve (3) is provided with a plurality of buffer holes (31) penetrating through the rubber sleeve (3) in the circumferential direction.

4. A bushing assembly for a hydraulic cylinder according to claim 3, characterized in that: The buffer holes (31) penetrate axially along the rubber sleeve (3).

5. The bushing assembly for a hydraulic cylinder according to claim 3, characterized in that: The buffer holes (31) are provided in an arc shape.

6. A bushing assembly for a hydraulic cylinder according to claim 3, characterized in that: Four buffer holes (31) are provided on the rubber sleeve (3), and the four buffer holes (31) are symmetrically arranged in pairs with respect to the rubber sleeve (3).

7. A bushing assembly for a hydraulic cylinder according to claim 6, characterized in that: The cross-sectional areas of two symmetrically arranged buffer holes (31) are smaller than those of the other two symmetrically arranged buffer holes (31).

8. A bushing assembly for a hydraulic cylinder according to claim 1, characterized in that: The rubber sleeve (3) is provided in a solid shape.

Images