Modular quick-change bearing and bushing press fitting tool

Abstract

The utility model relates to a kind of modularization quick-change type bearing and shaft sleeve press-fit tool, belong to bearing press-fit tool technical field;Including concrete, two sliding holes are provided on the concrete upper end face, one guide sleeve is respectively slidably inserted in each sliding hole along vertical direction, spring is arranged between the lower end of guide sleeve and the inner bottom surface of sliding hole;Guide slot is provided on the outer side of guide sleeve, guide key is fixedly arranged on the concrete, and the guide key is slidably inserted in the guide slot of guide sleeve;The same block of pressing plate is arranged on the upper end of two guide sleeves, two positioning pins are fixedly arranged on the lower end surface of pressing plate, and the upper end opening of two guide sleeves is respectively inserted in two positioning pins;Solve the problem of low efficiency, poor quality and high risk when manually press-fit sliding bearing.

Description

Technical Field

[0001] This utility model belongs to the field of bearing press-fitting tooling technology, specifically relating to a modular quick-change bearing and bushing press-fitting tooling. Background Technology

[0002] Sliding bearings, commonly known as Du sleeves, are open bearings with a certain degree of elasticity. In a free state, without the aid of tooling and external force, it is impossible to press the sliding bearing into the concave inner hole of the part. Currently, the pressing process of the sliding bearing sleeve is a key bottleneck restricting the efficiency of the entire process. The current reliance on manual pressing mode has several prominent problems.

[0003] From a cost and efficiency perspective, manual pressing requires dedicated personnel for operation, resulting in high labor costs. Furthermore, the daily production capacity of a single production line is insufficient to meet the needs of capacity ramp-up and delivery fulfillment, directly impacting market share consolidation and expansion.

[0004] In terms of quality control, the pressure fluctuation range of manual pressing is ±30%, and the pass rate of the same person at different times fluctuates by 20%. Fatal defects such as overpressure causing bushing cracks and underpressure causing abnormal noises during operation often occur, with a defect rate as high as 8%. Moreover, the bushing is made of aluminum alloy with a Brinell hardness of HBW45, and the sliding bearing is made of SF-1 three-layer composite material. Manual pressing can easily deform both of them, resulting in burrs and flash on the surface.

[0005] From a safety perspective, manual pressing can easily lead to hand crushing due to improper force application, posing a serious safety hazard. The manual pressing mode has evolved from an inefficiency issue to a systemic risk, and urgently needs improvement. Utility Model Content

[0006] This invention overcomes the shortcomings of existing technologies by proposing a modular quick-change bearing and bushing press-fitting fixture; solving the problems of low efficiency, poor quality, and high risk in the current manual press-fitting of sliding bearings.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0008] A modular quick-change bearing and bushing press-fitting fixture includes a clamping body. Two sliding holes are provided on the upper end face of the clamping body. A guide sleeve is slidably inserted into each sliding hole along the vertical direction. A spring is provided between the lower end of the guide sleeve and the inner bottom surface of the sliding hole. A guide groove is provided on the outer surface of the guide sleeve. A guide key is fixedly provided on the clamping body and slidably inserted into the guide groove of the guide sleeve. A single pressure plate is provided on the upper end of the two guide sleeves. Two locating pins are fixedly provided on the lower end face of the pressure plate and are respectively inserted into the upper openings of the two guide sleeves.

[0009] Furthermore, the sliding hole includes a small-diameter hole on the upper side and a large-diameter hole on the lower side. The upper end of the small-diameter hole is connected to the upper end face of the clamping body, and the lower end of the large-diameter hole is connected to the lower end face of the clamping body.

[0010] Furthermore, the guide sleeve is a vertically arranged cylindrical structure that runs through the top and bottom. A positioning pin insertion groove is provided at the upper opening of the guide sleeve, and a spring insertion groove is provided at the lower opening of the guide sleeve. The inner diameter of both the positioning pin insertion groove and the spring insertion groove is larger than the inner diameter of the guide sleeve.

[0011] Furthermore, the outer surface of the guide sleeve includes a small-diameter section on the upper side, a medium-diameter section in the middle, and a large-diameter section on the lower side. The outer diameter of the small-diameter section is smaller than that of the medium-diameter section, and the outer diameter of the medium-diameter section is smaller than that of the large-diameter section. The large-diameter section of the guide sleeve is slidably inserted into the large-diameter hole of the corresponding sliding hole, and the medium-diameter section of the guide sleeve is slidably inserted into the small-diameter hole of the corresponding sliding hole. The small-diameter section of the guide sleeve extends to the outer side of the upper opening of the sliding hole.

[0012] Furthermore, a base plate is fixedly installed at the lower end of the clamping body. The base plate is a horizontally arranged square plate structure, and the upper end face of the base plate is connected to the lower opening of the two sliding holes.

[0013] Furthermore, a spring is provided inside the large-diameter hole of each sliding hole. The upper end of the spring is inserted into the spring insertion groove at the lower end of the corresponding guide sleeve, and the lower end of the spring is in contact with the upper surface of the base plate.

[0014] Furthermore, the guide groove is located at the middle diameter section of the guide sleeve, and the guide groove remains vertical; a limiting block is fixedly installed at the upper end inside the guide groove.

[0015] Furthermore, a cylindrical mounting groove is provided at the upper end of the clamping body. The mounting groove is located on one side of the area between the two sliding holes. The mounting groove is connected to the interior of the small-diameter holes of the two sliding holes through two connecting grooves. The guide key is set inside the mounting groove. The guide key includes a cylindrical segment and two elongated segments. One end of each of the two elongated segments is fixedly connected to the outer surface of the cylindrical segment. The cylindrical segment is set inside the mounting groove, and the two elongated segments are set inside the two connecting grooves. The ends of the two elongated segments away from the cylindrical segment are slidably inserted into the guide grooves of the two guide sleeves.

[0016] Furthermore, a locking bolt is screwed onto the outer surface of the clamping body. The end of the locking bolt abuts tightly against the outer surface of the cylindrical section of the guide key, thereby fixing the guide key inside the mounting groove.

[0017] Furthermore, the two locating pins at the lower end of the pressure plate can be detachably inserted into the locating pin insertion slots at the upper ends of the two guide sleeves.

[0018] The beneficial effects of this utility model compared to the prior art are as follows: The pressing device provided by this utility model adopts a labor-saving pressing mechanism that transmits pressure evenly through the pressure plate. With the help of the guide component, the pressing trajectory is constrained throughout the process, avoiding deformation of the aluminum alloy bushing and SF-1 bearing due to excessive local stress. The force application method is adapted to the characteristics of the two soft materials. Through the precise cooperation between the guide sleeve and the clamp body (0.01-0.02mm gap) and the positioning pin and the guide sleeve (0.01mm gap), a dual precision control system of "radial anti-deviation + coaxial positioning" is constructed to ensure that the position does not shift and the size does not exceed the tolerance during the pressing process. This breaks the cycle of "low efficiency → fatigue → even lower efficiency" and takes into account precision, efficiency and material protection. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a front view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention after removing the pressure plate and positioning pin; Figure 4 yes Figure 3 AA section view in the middle; Figure 5 This is a schematic diagram of the connection between the bearing and the bushing; Among them, 1 is the clamping body, 2 is the guide sleeve, 3 is the spring, 4 is the guide groove, 5 is the guide key, 6 is the pressure plate, 7 is the positioning pin, 8 is the base plate, 9 is the fixing bolt, 10 is the limit block, 11 is the locking bolt, 12 is the bushing, and 13 is the bearing. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0021] like Figure 1As shown in Figure 4, this utility model provides a modular quick-change bearing and bushing press-fitting fixture, including a clamping body 1. Two sliding holes are provided on the upper end face of the clamping body 1. A guide sleeve 2 is slidably inserted into each sliding hole along the vertical direction. A spring 3 is provided between the lower end of the guide sleeve 2 and the inner bottom surface of the sliding hole. A guide groove 4 is provided on the outer side of the guide sleeve 2. A guide key 5 is fixedly provided on the clamping body 1. The guide key 5 is slidably inserted into the guide groove 4 of the guide sleeve 2. The same pressure plate 6 is provided on the upper end of the two guide sleeves 2. Two positioning pins 7 are fixedly provided on the lower end face of the pressure plate 6. The two positioning pins 7 are respectively inserted into the upper openings of the two guide sleeves 2.

[0022] The clamp body 1 has a cuboid structure, and both its upper and lower end faces are horizontal. The axes of the two sliding holes are both vertical, and the two sliding holes are symmetrically arranged. The sliding holes include a small-diameter hole on the upper side and a large-diameter hole on the lower side. The small-diameter hole and the large-diameter hole are connected. The inner diameter of the small-diameter hole is smaller than that of the large-diameter hole. The upper end of the small-diameter hole is connected to the upper end face of the clamp body 1, and the lower end of the large-diameter hole is connected to the lower end face of the clamp body 1.

[0023] The guide sleeve 2 is a vertically arranged, through-type cylindrical structure. A locating pin insertion groove is provided at the upper opening of the guide sleeve 2, and a spring insertion groove is provided at the lower opening of the guide sleeve 2. The inner diameters of both the locating pin insertion groove and the spring insertion groove are larger than the inner diameter of the guide sleeve 2. The outer surface of the guide sleeve 2 includes a small-diameter section at the top, a medium-diameter section in the middle, and a large-diameter section at the bottom. The outer diameter of the small-diameter section is smaller than that of the medium-diameter section, and the outer diameter of the medium-diameter section is smaller than that of the large-diameter section. The large-diameter section of the guide sleeve 2 is slidably inserted into the large-diameter hole of the corresponding sliding hole, and the medium-diameter section of the guide sleeve 2 is slidably inserted into the small-diameter hole of the corresponding sliding hole. The small-diameter section of the guide sleeve 2 extends to the outside of the upper opening of the sliding hole.

[0024] A base plate 8 is fixedly installed at the lower end of the clamping body 1. The base plate 8 is a horizontally arranged square plate structure, and the upper end face of the base plate 8 is connected to the lower end opening of two sliding holes. Four fixing bolts 9 pass upward through the four corners of the base plate 8 and are screwed into the four corners of the lower end face of the clamping body 1, thereby fixing the base plate 8 to the clamping body 1.

[0025] A spring 3 is provided inside the large-diameter hole of each sliding hole. The upper end of the spring 3 is inserted into the spring insertion groove at the lower end of the corresponding guide sleeve 2, and the lower end of the spring 3 is in contact with the upper surface of the base plate 8.

[0026] The guide groove 4 is located at the middle diameter section of the guide sleeve 2, and the guide groove 4 remains vertical. A limiting block 10 is fixedly installed at the upper end of the guide groove 4.

[0027] A cylindrical mounting groove is provided at the upper end of the clamping body 1. The mounting groove is located on one side of the area between the two sliding holes. The mounting groove is connected to the interior of the small-diameter holes of the two sliding holes through two connecting grooves. The guide key 5 is disposed inside the mounting groove. The guide key 5 includes a cylindrical segment and two elongated segments. One end of each of the two elongated segments is fixedly connected to the outer surface of the cylindrical segment. The cylindrical segment is disposed inside the mounting groove, and the two elongated segments are disposed inside the two connecting grooves. The ends of the two elongated segments away from the cylindrical segment are slidably inserted into the guide grooves 4 of the two guide sleeves 2. A locking bolt 11 is screwed onto the outer surface of the clamping body 1. The end of the locking bolt 11 abuts tightly against the outer surface of the cylindrical segment of the guide key 5, thereby fixing the guide key 5 inside the mounting groove.

[0028] The pressure plate 6 is a horizontally arranged square plate structure. The lower end of the pressure plate 6 is kept horizontal. The two positioning pins 7 at the lower end of the pressure plate 6 can be detachably inserted into the positioning pin insertion grooves at the upper end of the two guide sleeves 2.

[0029] The fixture body 1 is the basic support component of the entire tooling, providing an installation reference for other components. The fixture body 1 is fixed to the base plate 8, and through its interaction with the locating pin 7, it achieves preliminary positioning of the workpiece, ensuring that the workpiece is in the correct position before pressing.

[0030] The guide key 5 and the guide sleeve 2 form a multi-stage guide assembly. During the press-fitting process, the guide key 5 guides the direction, while the guide sleeve 2 further restricts the radial offset of the press-fitting. The two work together to control the radial offset of the press-fitting to ≤0.01mm, ensuring the press-fitting accuracy and preventing the bushing 12 and bearing 13 from deforming or producing burrs and flash due to offset.

[0031] Spring 3 ensures that the tooling can automatically reset within 0.5 seconds after pressing, with a reset error of ≤0.03mm, thus preparing for the next pressing.

[0032] The limit block 10 limits the pressing stroke to prevent overpressure from causing problems such as cracking of the bushing 12, thus ensuring the pressing quality.

[0033] The base plate 8 is made of Q235-A material, the clamp body 1 and the pressure plate 6 are made of 45 material, the guide key 5, the guide sleeve 2 and the limit block 10 are made of GC15 material, and the spring 3 is made of 65M material.

[0034] The working principle of this utility model is as follows: like Figure 5As shown, the tooling is first assembled. Two guide sleeves 2 are inserted into the lower openings of the two sliding holes of the fixture body 1, ensuring a clearance of 0.01mm-0.02mm between the sliding holes of the fixture body 1 and the outer diameter of the guide sleeves 2, ensuring stable positioning of the guide sleeves 2. Then, two springs 3 are inserted into the lower openings of the two sliding holes of the fixture body 1, ensuring that the upper ends of the two springs 3 extend into the spring insertion grooves at the lower ends of the two guide sleeves 2. Next, the base plate 8 is fixedly connected to the fixture body 1 using fixing bolts 9. At this point, under the rebound force of the two springs 3, the upper end of the large-diameter section of the guide sleeve 2 contacts the top surface inside the large-diameter hole of the sliding hole, and the upper half of the middle-diameter section of the guide sleeve 2 extends to the outer side of the upper end face of the fixture body 1. Then, the guide key 5 is placed inside the mounting groove, ensuring that the two elongated sections of the guide key 5, away from the cylindrical section, are respectively inserted into the guide grooves 4 of the two guide sleeves 2. Finally, the locking screws are tightened to fix the guide key 5 to the mounting groove.

[0035] When pressing two bearings 13 into the two mounting holes of the bushing 12, first, fit the two mounting holes on the bushing 12 into the exposed upper half of the middle diameter section of the two guide holes. The lower end face of the bushing 12 should be in contact with the upper end face of the clamping body 1, and the upper end face of the bushing 12 should be located at the connection between the middle diameter section and the small diameter section of the guide sleeve 2. Then, fit the two bearings 13 onto the outside of the small diameter section of the two guide sleeves 2, with the lower end of the bearing 13 in contact with the upper end face of the middle diameter section, and the upper end of the bearing 13 flush with the upper end face of the guide sleeve 2. Finally, insert the two locating pins 7 on the pressure plate 6 into the locating pin insertion grooves at the upper end of the two guide sleeves 2, with the upper ends of the two bearings 13 in contact with the lower end face of the pressure plate 6. The workpiece and guide sleeve 2 are fitted with a 0.015mm clearance to achieve initial radial positioning; then, through the precise fit between the positioning pin 7 on the pressure plate 6 and the positioning pin insertion groove at the upper end of the guide sleeve 2, the double fixation of "surface positioning + pin positioning" is completed, completely eliminating the positional deviation of the workpiece before pressing.

[0036] Then, the press is controlled to press the pressure plate 6 downward. The pressure plate 6 drives the two guide sleeves 2 and the two bearings 13 to move down synchronously through the two positioning pins 7, and the two springs 3 are compressed. Under the mutual guiding action of the guide key 5 and the guide grooves 4 on the two guide sleeves 2, the guide sleeves 2 and the bearings 13 are ensured to move down stably, ensuring that the workpiece is not tilted or deviated during the pressing process, and avoiding end face damage and accuracy deviation.

[0037] When the pressure plate 6 descends to the preset depth, the limiting blocks 10 on the two guide sleeves 2 contact the guide key 5, and the guide sleeves 2 and bearings 13 move down to their maximum positions. The press automatically stops pressing, effectively avoiding problems such as workpiece deformation and bearing 13 damage caused by excessive pressing stroke, ensuring consistent pressing quality. At this time, the two bearings 13 are pressed into the two mounting holes of the bushing 12, and the bushing 12 and bearings 13 are fixed to each other. Then the press releases the pressure plate 6, and under the rebound force of the two springs 3, the two guide sleeves 2 are lifted, and the fixed bushings 12 and two bearings 13 are also lifted at the same time. At this time, the bushings 12 and bearings 13 are located outside the small diameter section of the two guide sleeves 2. Then the pressure plate 6 is removed, and the fixed bushings 12 and bearings 13 can be removed, ready for the next pressing process.

[0038] Extensive usage and verification have demonstrated improved efficiency: reduced operational intensity, avoidance of vicious cycles, 0.1-second rapid automatic reset to reduce waiting time, and single-piece pressing time reduced from 70 seconds / piece to 31 seconds / piece, resulting in an efficiency improvement of approximately 125.8%. Positioning and guiding mechanisms resolve uneven manual pressing force issues, eliminate burrs and scratches on the 12-end face of the bushing, and increase the appearance qualification rate from 15% to 100%; key dimensional requirements all conform to drawing specifications. This device can be used for developing internal components for new agricultural machinery gear pumps, providing support for product matrix upgrades.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A modular quick-change bearing and bushing press-fitting fixture, characterized in that: The fixture includes a clamping body (1), which has two sliding holes on its upper surface. A guide sleeve (2) is slidably inserted into each sliding hole along the vertical direction. A spring (3) is provided between the lower end of the guide sleeve (2) and the inner bottom surface of the sliding hole. A guide groove (4) is provided on the outer surface of the guide sleeve (2). A guide key (5) is fixedly provided on the clamping body (1). The guide key (5) is slidably inserted into the guide groove (4) of the guide sleeve (2). The same pressure plate (6) is provided on the upper end of the two guide sleeves (2). Two positioning pins (7) are fixedly provided on the lower surface of the pressure plate (6). The two positioning pins (7) are respectively inserted into the upper opening of the two guide sleeves (2).

2. The modular quick-change bearing and bushing press-fitting fixture according to claim 1, characterized in that: The sliding hole includes a small-diameter hole on the upper side and a large-diameter hole on the lower side. The upper end of the small-diameter hole is connected to the upper end face of the clamping body (1), and the lower end of the large-diameter hole is connected to the lower end face of the clamping body (1).

3. The modular quick-change bearing and bushing press-fitting fixture according to claim 2, characterized in that: The guide sleeve (2) is a vertically arranged cylindrical structure that runs through the top and bottom. A positioning pin insertion groove is provided at the upper opening of the guide sleeve (2), and a spring insertion groove is provided at the lower opening of the guide sleeve (2). The inner diameter of both the positioning pin insertion groove and the spring insertion groove is larger than the inner diameter of the guide sleeve (2).

4. The modular quick-change bearing and bushing press-fitting fixture according to claim 3, characterized in that: The outer surface of the guide sleeve (2) includes a small diameter section on the upper side, a medium diameter section in the middle, and a large diameter section on the lower side. The outer diameter of the small diameter section is smaller than that of the medium diameter section, and the outer diameter of the medium diameter section is smaller than that of the large diameter section. The large diameter section of the guide sleeve (2) is slidably inserted into the large diameter hole of the corresponding sliding hole, and the medium diameter section of the guide sleeve (2) is slidably inserted into the small diameter hole of the corresponding sliding hole. The small diameter section of the guide sleeve (2) extends to the outer side of the upper opening of the sliding hole.

5. The modular quick-change bearing and bushing press-fitting fixture according to claim 3, characterized in that: A base plate (8) is fixedly installed at the lower end of the clamping body (1). The base plate (8) is a horizontally arranged square plate structure. The upper end face of the base plate (8) is connected to the lower end opening of the two sliding holes.

6. The modular quick-change bearing and bushing press-fitting fixture according to claim 5, characterized in that: A spring (3) is provided inside the large-diameter hole of each sliding hole. The upper end of the spring (3) is inserted into the spring insertion groove at the lower end of the corresponding guide sleeve (2), and the lower end of the spring (3) is in contact with the upper surface of the base plate (8).

7. The modular quick-change bearing and bushing press-fitting fixture according to claim 4, characterized in that: The guide groove (4) is located at the middle diameter section of the guide sleeve (2), and the guide groove (4) remains vertical; a limiting block (10) is fixedly installed at the upper end inside the guide groove (4).

8. A modular quick-change bearing and bushing press-fitting fixture according to claim 7, characterized in that: A cylindrical mounting groove is provided at the upper end of the clamping body (1). The mounting groove is located on one side of the area between the two sliding holes. The mounting groove is connected to the small diameter holes of the two sliding holes through two connecting grooves. The guide key (5) is set inside the mounting groove. The guide key (5) includes a cylindrical section and two long strips. One end of the two long strips is fixedly connected to the outer side of the cylindrical section. The cylindrical section is set inside the mounting groove, and the two long strips are set inside the two connecting grooves. The ends of the two long strips away from the cylindrical section are slidably inserted into the guide grooves (4) of the two guide sleeves (2).

9. A modular quick-change bearing and bushing press-fitting fixture according to claim 8, characterized in that: A locking bolt (11) is screwed onto the outer side of the clamping body (1). The end of the locking bolt (11) is in close contact with the outer side of the cylindrical section of the guide key (5), thereby fixing the guide key (5) inside the mounting groove.

10. A modular quick-change bearing and bushing press-fitting fixture according to claim 3, characterized in that: The two positioning pins (7) at the lower end of the pressure plate (6) can be detachably inserted into the positioning pin insertion slots at the upper end of the two guide sleeves (2).

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