Anti-creep shaft sleeve mounting structure

Abstract

The utility model relates to engineering machinery technical field provides a kind of anti-axle sleeve installation structure, including axle sleeve and axle seat, the axle sleeve outer wall and along the axle sleeve circumferential interval several outer arc surfaces and several first planes, the axle seat is provided with axle hole, the inner arc surface is set in the axle hole inner wall corresponding outer arc surface, the second plane is set in the axle hole inner wall corresponding first plane, the axle sleeve is installed in axle seat, can prevent axle sleeve between axle seat and rotate when working, to avoid breakdown downtime.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically to an anti-slip bushing installation structure. Background Technology

[0002] In the overall structure of an excavator, key components such as the platform, boom, stick, and bucket are typically connected and rotate relative to each other through the fit of pins and bushings. The bushings are interference-fitted into seat holes and are generally designed as thin-walled annular structures, relying on interference to achieve fixation. This type of structure must withstand frequent changes in heavy loads, impacts, and complex torques during excavator operation, placing high demands on the bushing's fixation reliability and lubrication condition.

[0003] In actual working conditions, excavators are often in high-load, high-intensity operating environments. When the excavator is subjected to excessive force or the grease inside the bushing is not properly applied, the pin may seize with the bushing, causing the bushing to rotate radially. The bushing will be subjected to the frictional torque from the pin, resulting in a tendency to rotate radially. At this time, the bushing is no longer in a stationary state, and it fails due to movement within the seat hole. The original design intention of the interference fit between the bushing and the seat hole is to form a single, fixed support. The pin rotates within the bushing's inner hole, thus achieving a stable rotating pair and ensuring the flexible rotation of the components. Therefore, the bushing itself must be absolutely stationary. If the bushing rotates within the seat hole, it is equivalent to adding an unexpected and uncontrolled "rotational joint," which violates the kinematic principles of the design. This leads to unstable and inaccurate movement of components such as the boom and stick. The failure of the bushing due to movement within the seat hole will cause downtime and affect work efficiency. Utility Model Content

[0004] To achieve the above objectives, this utility model proposes an anti-slip bushing installation structure, including a bushing and a bearing seat. The outer wall of the bushing is provided with a plurality of outer arc surfaces and a plurality of first planes at intervals along the circumference of the bushing. The bearing seat is provided with a shaft hole. The inner wall of the shaft hole is provided with an inner arc surface corresponding to the outer arc surface. The inner wall of the shaft hole is provided with a second plane corresponding to the first plane. The bushing is installed in the bearing seat.

[0005] Further configured, the outer arc surface and the inner arc surface are interference fit, the interference fit ensures that the bushing obtains initial and strong static friction force after installation, realizing the initial positioning and fastening of the bushing in the shaft hole. The first plane and the second plane are transition fit, the transition fit ensures the feasibility of normal installation, and reserves the working space for mechanical interlocking under abnormal working conditions.

[0006] Further configured, the width of the first plane is one-eighth of the circumference of the bushing, providing a sufficiently large contact area to effectively resist the frictional torque transmitted by the pin, and the length of the first plane is equal to the shaft length, ensuring that the anti-torsional contact surface is completely covered along the axial direction.

[0007] Further configured, at least two outer arc surfaces are provided, and the outer arc surfaces are provided in pairs; at least two inner arc surfaces are provided, and the inner arc surfaces are provided in pairs; the paired arc surfaces constitute a symmetrical and stable interference fit area.

[0008] Further configured, at least two first planes are provided, the first planes are provided in pairs, at least two second planes are provided, the second planes are provided in pairs, and the paired planes form a symmetrical moment resistance knot.

[0009] The configuration is further set such that each pair of the first planes is parallel to each other, and each pair of the second planes is parallel to each other, so that the parallel planes can achieve maximum contact area when they come into contact.

[0010] A further configuration is provided where the first plane has a first chamfer on both sides and the second plane has a first chamfer on both sides. When the bushing is pressed into the shaft hole, the chamfer can play a guiding role, preventing sharp edges from scratching the mating surfaces, and is especially convenient for aligning planar structures.

[0011] A further configuration includes several oil reservoirs arranged in rows along the circumference of the bushing on the inner wall of the bushing, and an annular oil passage located at the center of the bushing. The oil reservoirs and the annular oil passage together constitute a highly efficient lubrication system.

[0012] A further provision is that the bushing mounting end is provided with a second chamfer, which provides significant convenience for bushing installation, greatly reduces installation difficulty and time, and effectively reduces damage to the outer surface of the bushing or the inner wall of the shaft hole caused by forced installation.

[0013] A further configuration is provided with an annular baffle at the end of the shaft hole and facing the center of the shaft hole. The annular baffle restricts the axial movement freedom of the bushing. During the operation of the excavator, the component will be subjected to complex multidimensional forces, and the bushing may have a slight tendency to move axially.

[0014] The beneficial effects of one or more of the above technical solutions: The utility model designs the bushing as a non-cylindrical shape, including two arc surfaces and two mating planes. The two arc surfaces of the bushing are press-fitted with the inner wall of the seat hole, which can realize the mating function of the traditional bushing and seat hole, ensuring that the bushing does not move during normal excavator operation. When the excavator is subjected to excessive force or the grease in the bushing is not properly filled, the pin will seize with the bushing and drive the bushing to rotate radially. At this time, the bushing will be subjected to the frictional torque brought by the pin and will have a tendency to rotate radially. Since the bushing and seat hole are designed with non-cylindrical mating surfaces, the rotation tendency of the bushing is restricted by the two planar structures, thereby preventing the bushing from moving. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0016] Figure 1 This is a schematic diagram of the bushing structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the bearing seat of this utility model.

[0018] In the diagram, 1 is the bushing; 11 is the outer arc surface; and 12 is the first plane. 2. Shaft seat; 21. Shaft hole; 22. Inner arc surface; 23. Second plane; 3. First chamfer; 4. Second chamfer; 5. Oil storage tank; 6. Oil passage; 7. Annular baffle. Detailed Implementation

[0019] The specific implementation of this embodiment will now be described with reference to the accompanying drawings.

[0020] Example 1 A type of anti-slip bushing mounting structure, referring to Figure 1 and Figure 2 The bushing assembly includes a bushing 1 and a bearing seat 2. The bushing 1 has several outer arc surfaces 11 and several first planes 12 spaced apart on its outer wall and circumferentially. The bearing seat 2 has a shaft hole 21. The inner wall of the shaft hole 21 has an inner arc surface 22 corresponding to the outer arc surfaces 11, and a second plane 23 corresponding to the first planes 12. The bushing 1 is installed inside the bearing seat 2. By designing the bushing 1 and the shaft hole 21 with a non-cylindrical fit (outer arc surface 11 / inner arc surface 22 + first plane 12 / second plane 23), the force distribution mode of the traditional cylindrical bushing is fundamentally changed. During normal operation, the interference fit between the outer arc surface 11 and the inner arc surface 22 provides the main radial support and anti-rotation resistance, ensuring that the bushing 1 remains absolutely stationary.

[0021] When abnormal operating conditions occur, such as insufficient lubrication or excessive external load causing the pin and bushing 1 to seize, the resulting huge frictional torque will attempt to drive the bushing 1 to rotate. At this time, the paired planar structures (first plane 12 and second plane 23) will abut against each other, converting the original rotational torque into a normal force between the planes, thereby mechanically and rigidly preventing any circumferential rotation of the bushing 1. This structure changes the failure mode from rotational slippage to self-locking, greatly improving the reliability and stability of the connection.

[0022] The outer arc surface 11 and the inner arc surface 22 are interference-fitted. The interference fit ensures that the bushing 1 obtains the initial and strong static friction force after installation, realizes the initial positioning and fastening of the bushing 1 in the shaft hole 21, effectively resists various radial loads and slight impacts under normal operation, and prevents fretting wear caused by vibration in the early stage of equipment life.

[0023] The first plane 12 and the second plane 23 are in a transitional fit. This transitional fit ensures the feasibility of normal installation while reserving space for mechanical interlocking under abnormal working conditions. It avoids installation difficulties or damage to the mating surfaces caused by excessive tightness, and ensures that the plane can quickly contact and bear the load once the bushing 1 has a tendency to rotate. This design means that the plane structure does not participate in the main load-bearing under normal circumstances, but only plays a role at critical moments of anti-movement, thus optimizing the overall performance of the structure.

[0024] The length of the first plane 12 is equal to the shaft length, and the width of the first plane 12 is set to one-eighth of the circumference of the bushing. This provides a sufficiently large contact area to effectively resist the frictional torque transmitted by the pin and prevent excessive stress concentration, while retaining a sufficient arc-shaped mating area to ensure the clamping force of the initial interference fit and the overall structural strength. The length of the first plane 12 is exactly the same as the length of the bushing, ensuring that the anti-torsional contact surface completely covers the shaft along the axial direction. This allows the torque resistance to be evenly distributed along the entire mating length, thereby greatly improving the reliability and stability of the constraint and avoiding the risk of uneven wear or failure due to localized contact.

[0025] At least two outer arc surfaces 11 are provided, and the outer arc surfaces 11 are arranged in pairs. At least two inner arc surfaces 22 are provided, and the inner arc surfaces 22 are arranged in pairs. The paired arc surfaces form a symmetrical and stable interference fit area. This symmetry ensures that the bushing 1 is subjected to uniform force when pressed into the shaft hole 21, and will not be skewed, thus ensuring coaxiality after installation. The symmetrical arrangement allows the radial load from the pin to be evenly transmitted to the bearing seat 2.

[0026] At least two first planes 12 are provided, arranged in pairs. At least two second planes 23 are also provided, arranged in pairs. These paired planes form a symmetrical torque-resisting structure. When an abnormal torque attempts to drive the bushing 1 to rotate, the two pairs of planes can simultaneously and symmetrically contact each other and form a couple, thereby efficiently and balancedly counteracting the rotational torque. Each pair of the first planes 12 is parallel to each other, and each pair of the second planes 23 is parallel to each other. When the parallel planes come into contact, they can achieve maximum surface contact, rather than line contact or point contact. This significantly increases the force-bearing area and greatly reduces the pressure (pressure per unit area) on the contact surface, thereby avoiding possible crushing or plastic deformation of the plane edges under huge impact torque.

[0027] First chamfers 3 are provided on both sides of the first plane 12 and the second plane 23. The first chamfers 3 facilitate installation guidance. When the bushing 1 is pressed into the shaft hole 21, the chamfers can play a guiding role, preventing sharp edges from scratching the mating surfaces. In particular, it facilitates the alignment of planar structures. The setting of the first chamfers 3 eliminates sharp corners, avoiding cracks from sharp corners during the pressing process or under load, and improving the fatigue strength of the parts.

[0028] A plurality of oil reservoirs 5 are arranged in rows along the circumference of the bushing 1 on its inner wall. The oil reservoirs 5 and oil passages 6 together constitute a highly efficient lubrication system. The oil reservoirs 5 can store more grease, providing continuous lubrication when the pin rotates, significantly extending the interval between lubrication replenishments. An annular oil passage 6 is located at the center of the bushing 1. The annular oil passage 6 helps the grease to be distributed circumferentially within the bushing 1, avoiding localized poor lubrication and improving the overall lubrication effect.

[0029] The bushing 1 has a second chamfer 4 at its mounting end. Specifically, the bushing has a second chamfer 4 machined on one end and on its circular side. The second chamfer 4 provides significant convenience for the installation of the bushing 1. It acts as a guide, allowing the bushing 1 to be aligned and inserted into the shaft hole 21 more easily and quickly. Especially when replacing parts on site, it greatly reduces the installation difficulty and time, while effectively reducing damage to the outer surface of the bushing 1 or the inner wall of the shaft hole 21 caused by forced installation.

[0030] An annular baffle 7 is provided at the end of the shaft hole 21 and facing the center of the shaft hole 21. The annular baffle 7 restricts the axial movement freedom of the bushing 1. During excavator operation, the components are subjected to complex multidimensional forces, and the bushing 1 may have a slight tendency to move axially. This baffle acts as a robust mechanical barrier, completely eliminating the possibility of the bushing 1 coming off the other end of the shaft hole 21, and providing additional axial fixation protection.

[0031] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A bushing mounting structure for preventing slippage, characterized in that, The device includes a bushing and a bearing seat. The outer wall of the bushing has several outer arc surfaces and several first planes spaced apart along the circumference of the bushing. The bearing seat has a shaft hole. The inner wall of the shaft hole has an inner arc surface corresponding to the outer arc surface. The inner wall of the shaft hole has a second plane corresponding to the first plane. The bushing is installed inside the bearing seat.

2. The anti-slip bushing mounting structure according to claim 1, characterized in that, The outer arc surface and the inner arc surface are interference-fitted, and the first plane and the second plane are transition-fitted.

3. The anti-slip bushing mounting structure according to claim 1, characterized in that, The width of the first plane is one-eighth of the circumference of the bushing, and the length of the first plane is equal to the length of the shaft.

4. The anti-slip bushing mounting structure according to claim 1, characterized in that, At least two outer arc surfaces are provided, and the outer arc surfaces are provided in pairs. At least two inner arc surfaces are provided, and the inner arc surfaces are provided in pairs.

5. The anti-slip bushing mounting structure according to claim 1, characterized in that, At least two first planes are provided, and the first planes are provided in pairs. At least two second planes are provided, and the second planes are provided in pairs.

6. The anti-slip bushing mounting structure according to claim 1, characterized in that, Each pair of the first planes is parallel to each other, and each pair of the second planes is parallel to each other.

7. The anti-slip bushing mounting structure according to claim 1, characterized in that, The first plane has a first chamfer on both sides, and the second plane has a first chamfer on both sides.

8. The anti-slip bushing mounting structure according to claim 1, characterized in that, The inner wall of the bushing is provided with several oil storage grooves arranged in rows along the circumference of the bushing, and an annular oil passage is provided at the center of the bushing.

9. The anti-slip bushing mounting structure according to claim 1, characterized in that, The bushing mounting end is provided with a second chamfer.

10. The anti-slip bushing mounting structure according to claim 1, characterized in that, An annular baffle is provided at the end of the shaft hole and facing the center of the shaft hole.

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