A device for dismounting a needle bearing in a gearbox housing

Abstract

This utility model discloses a disassembly device for needle roller bearings in a gearbox housing, relating to the field of automotive repair tool technology. It includes at least an expansion sleeve, a limiting nut, a push pin, and a sleeve. The top of the expansion sleeve is fixed to the bottom of the limiting nut. The lower part of the expansion sleeve is an expansion section, with several expansion slots on its sidewall. The bottom inner hole of the expansion sleeve has an inwardly extending flange for the push pin to abut against the expansion. The top of the push pin has a wrench-type connector, and the lower section of the push pin passes through the limiting nut and is located inside the expansion sleeve. The sidewall of the push pin has external threads that engage with the limiting nut, and the lower part of the push pin has a tapered portion. The bottom of the sleeve has a receiving cavity for the wrench-type connector to extend into. This disassembly device can disassemble needle roller bearings located at the bottom of the gearbox housing and can be flexibly adjusted according to different specifications and sizes of needle roller bearings and housing structures, eliminating the need for frequent replacement or preparation of multiple tools, thus improving the versatility and applicability of the tools.

Description

Technical Field

[0001] This utility model relates to the field of automotive repair tools, and in particular to a disassembly device for needle roller bearings inside a gearbox housing. Background Technology

[0002] Needle roller bearings for automatic transmissions play a crucial role due to their high load-bearing capacity and low coefficient of friction. During operation, the power transmission within an automatic transmission often relies on needle roller bearings to support rotating components. The efficient and stable torque transmission is achieved through the rolling of the needle rollers between the inner and outer rings.

[0003] During long-term use, due to wear and damage, needle roller bearings need to be disassembled and replaced to ensure stable gearbox performance.

[0004] Existing disassembly tools are too specialized, only suitable for specific models and sizes of gearbox needle roller bearings and their matching housings. However, some gearbox needle roller bearings are located at the bottom of the housing, making disassembly from the input end too difficult and inefficient with existing tools. Furthermore, when disassembling from the output end, the output bore diameter is smaller than the inner diameter of the needle roller bearing, resulting in a flared shape and causing structural interference during disassembly. Utility Model Content

[0005] To address the aforementioned problems, this invention proposes a disassembly device for needle roller bearings inside a gearbox housing. This disassembly device can disassemble the needle roller bearings located at the bottom of the gearbox housing and can be flexibly adjusted according to different specifications and sizes of needle roller bearings and housing structures, eliminating the need for frequent replacements or the preparation of multiple tools, thus improving the versatility and applicability of the tools.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A disassembly device for a needle roller bearing in a gearbox housing includes at least a sleeve, a limiting nut, a push pin, and a bushing.

[0008] The top of the expansion sleeve is fixed to the bottom of the limiting nut; the lower part of the expansion sleeve is an expansion part, and several expansion slots are opened on the side wall of the expansion sleeve. Each expansion slot extends along the axial direction of the expansion sleeve to the bottom of the expansion sleeve; the bottom inner hole of the expansion sleeve is provided with an inwardly extending flange for the ejector pin to abut against the expansion.

[0009] The top of the ejector pin is provided with a wrench clamp connector, the lower section of the ejector pin passes through the limiting nut and is located inside the expansion sleeve, the side wall of the ejector pin is provided with an external thread that engages with the limiting nut, and the lower part of the ejector pin is provided with a tapered part.

[0010] The bottom of the sleeve is provided with a receiving cavity for the wrench clamp to extend into, and the lower end of the receiving cavity is open. The upper end face of the sleeve is a striking surface, and the lower end face of the sleeve is a mating surface that abuts against the top of the limit nut.

[0011] Preferably, there are four expansion joints, which are equidistantly spaced along the circumference of the expansion sleeve.

[0012] Preferably, a limiting sleeve is provided on the outer side of the expansion sleeve, and a plurality of ball screws are positioned on the limiting sleeve. The ball screws correspond one-to-one with the expansion slots. A plurality of annular grooves are provided on the side wall of the ejector pin along the circumferential direction. The front end of the ball screw passes through the corresponding expansion slot and extends into the annular groove of the ejector pin.

[0013] Preferably, the inner hole of the limiting sleeve is a frustum shape with a larger upper part and a smaller lower part.

[0014] Preferably, the outer side of the expansion sleeve is stepped, and the diameter gradually increases from top to bottom, with the wall thickness of the lower part of the expansion sleeve being greater than that of the upper part.

[0015] This utility model has the following advantages: 1. It can disassemble the needle roller bearing located at the bottom of the gearbox housing without being affected by the output end bore diameter being smaller than the inner diameter of the needle roller bearing; 2. It has strong applicability and can be applied to needle roller bearings and matching housings of different models and sizes; 3. It is simple and efficient to operate, improves disassembly efficiency, and has low manufacturing cost. Attached Figure Description

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

[0017] Figure 2 This is a cross-sectional view of the present invention.

[0018] Figure 3 yes Figure 2 Enlarged view of point a in the middle.

[0019] Figure 4 This is a structural diagram of the present invention before its use.

[0020] Figure 5 yes Figure 4 Enlarged view of point b in the middle.

[0021] Figure 6 This is a schematic diagram of the structure of this utility model in use.

[0022] Figure 7 yes Figure 6 A magnified view of point c in the middle.

[0023] 1: Expansion sleeve; 2: Limit nut; 3: Ejector pin; 4: Sleeve; 5: Expansion joint; 6: Flanged edge; 7: Wrench clamp; 8: External thread; 9: Tapered part; 10: Receiving cavity; 11: Limit sleeve; 12: Ball screw; 13: Annular groove; 14: Gearbox housing; 15: Needle roller bearing. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] A disassembly device for needle roller bearings inside a gearbox housing, see [link / reference]. Figures 1 to 3 It includes at least an expansion sleeve 1, a limit nut 2, a pin 3, and a sleeve 4.

[0026] The top of the expansion sleeve 1 is welded and fixed to the bottom of the limiting nut 2; the lower part of the expansion sleeve 1 is an expansion part, and four expansion slits 5 are provided on the side wall of the expansion sleeve 1. The four expansion slits 5 are equidistantly spaced along the circumference of the expansion sleeve 1, and each expansion slit 5 extends along the axial direction of the expansion sleeve 1 to the bottom of the expansion sleeve 1; the bottom inner hole of the expansion sleeve 1 is provided with an inwardly extending flange 6 for the ejector pin 3 to abut against the expansion.

[0027] The outer side of the expansion sleeve 1 is stepped, and the diameter gradually increases from top to bottom. The wall thickness of the lower part of the expansion sleeve 1 is greater than that of the upper part. The thinner upper wall of the expansion sleeve 1 allows it to have sufficient expansion deformation; the thicker lower wall allows it to withstand greater impact force, thus enabling it to impact and disassemble the needle roller bearing of the housing.

[0028] The expansion sleeve 1 is made of 65Mn material, which has sufficient elasticity and toughness.

[0029] The top of the ejector pin 3 is provided with a wrench retainer 7, which is used for wrench locking and positioning, and for rotating the ejector pin 3. The lower section of the ejector pin 3 passes through the limiting nut 2 and is located inside the expansion sleeve 1. The side wall of the ejector pin 3 is provided with an external thread 8 that engages with the limiting nut 2. The ejector pin 3 is engaged with the limiting nut 2. By rotating the ejector pin 3, the ejector pin 3 can move up and down relative to the limiting nut 2. The lower part of the ejector pin 3 is provided with a tapered part 9, which can abut against the flange 6 at the bottom inner hole of the expansion sleeve 1, thereby achieving the expansion effect of the expansion sleeve 1.

[0030] The bottom of the sleeve 4 is provided with a receiving cavity 10 for the wrench clamp 7 to extend into, and the lower end of the receiving cavity 10 is open. The upper end surface of the sleeve 4 is a striking surface, and the lower end surface of the sleeve 4 is a mating surface that abuts against the top of the limit nut 2.

[0031] A limiting sleeve 11 is fitted onto the outer side of the expansion sleeve 1. Four ball screws 12 are positioned on the limiting sleeve 11 at the same height. Each ball screw 12 corresponds to an expansion slot 5. Three annular grooves 13 are provided circumferentially on the side wall of the ejector pin 3. The front ends of the ball screws 12 pass through the corresponding expansion slots 5 and extend into the same annular groove 13 of the ejector pin 3. The ejector pin 3 can rotate relative to the expansion sleeve 1 and can move the expansion sleeve 1 up and down through the ball screws 12. The three annular grooves 13 are provided to adjust the height at which the limiting sleeve 11 is restricted to the ejector pin 3, thereby adjusting the degree of expansion of the expansion sleeve 1. The inner hole of the limiting sleeve 11 is frustum-shaped, larger at the top and smaller at the bottom, to facilitate better fit with the outer wall of the expanded expansion sleeve 1.

[0032] Before use, such as Figure 4 , Figure 5 As shown, the tapered portion 9 at the lower end of the ejector pin 3 does not abut against the flange 6 at the bottom inner hole of the expansion sleeve 1, and the expansion sleeve 1 does not expand. The lower end of the expansion sleeve 1 of the disassembly device is inserted into the input end of the gearbox housing 14, and the lower end of the expansion sleeve 1 is positioned above the needle roller bearing 15.

[0033] When using, such as Figure 6 , Figure 7 As shown, by turning the wrench clamp 7, the ejector pin 3 rotates. Since the ejector pin 3 is screwed onto the limit nut 2, the ejector pin 3 moves downward relative to the limit nut 2. When the tapered part 9 at the lower end of the ejector pin 3 abuts against the flange 6 at the bottom inner hole of the expansion sleeve 1, the ejector pin 3 continues to move downward. The tapered part 9 pushes the flange 6 outward, thereby expanding the lower part of the expansion sleeve 1. When the bottom of the expansion sleeve 1 is expanded to be larger than the inner diameter of the needle roller bearing 15, the bottom plane of the expansion sleeve 1 abuts against the top of the needle roller bearing 15. Then, the sleeve 4 is fitted onto the wrench clamp 7. At this time, the lower end of the sleeve 4 abuts against and supports the top of the limit nut 2, serving as the force-bearing part, while the upper end of the wrench clamp 7 does not contact the top surface of the receiving cavity 10 of the sleeve 4. This design ensures that when the upper surface of the sleeve 4 is struck, the threads between the ejector pin 3 and the limiting nut 2 will not be stressed, preventing direct impact on the ejector pin 3 and thus avoiding damage to these threads. Finally, only the upper surface of the sleeve 4 needs to be struck; the expanding sleeve 1 at the bottom will dislodge the needle roller bearing 15 inside the gearbox housing 14. Furthermore, by providing a limiting sleeve 11 on the outside of the expanding sleeve 1, it will not continue to expand during the striking process, preventing damage to the inner wall of the input end of the gearbox housing 14.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. All aspects within the spirit and principles of this utility model should be included within its protection scope.

Claims

1. A device for dismounting a needle bearing in a gearbox housing, characterized in that: It includes at least an expansion sleeve (1), a limit nut (2), a ejector pin (3), and a sleeve (4). The top of the expansion sleeve (1) is fixed to the bottom of the limiting nut (2); the lower part of the expansion sleeve (1) is an expansion part, and several expansion slots (5) are provided on the side wall of the expansion sleeve (1). Each expansion slot (5) extends along the axial direction of the expansion sleeve (1) to the bottom of the expansion sleeve (1); the bottom inner hole of the expansion sleeve (1) is provided with an inwardly extending flange (6) for the ejector pin (3) to abut against the expansion. The top of the ejector pin (3) is provided with a wrench clamp connector (7), the lower section of the ejector pin (3) passes through the limiting nut (2) and is located in the expansion sleeve (1), the side wall of the ejector pin (3) is provided with an external thread (8) that engages with the limiting nut (2), and the lower part of the ejector pin (3) is provided with a tapered part (9). The bottom of the sleeve (4) is provided with a receiving cavity (10) for the wrench clamp (7) to extend into, and the lower end of the receiving cavity (10) is open. The upper end face of the sleeve (4) is a striking surface, and the lower end face of the sleeve (4) is a mating surface that abuts against the top of the limiting nut (2).

2. A device for dismounting a cage inner needle bearing of a gearbox housing according to claim 1, characterized in that: The number of expansion joints (5) is four, and the four expansion joints (5) are equidistantly spaced along the circumference of the expansion sleeve (1).

3. A device for dismounting a cage inner needle bearing of a gearbox housing according to claim 1 or 2, characterized in that: A limiting sleeve (11) is provided on the outer side of the expansion sleeve (1). Several ball screws (12) are positioned on the limiting sleeve (11). The ball screws (12) correspond one-to-one with the expansion slots (5). Several annular grooves (13) are provided on the side wall of the ejector pin (3) along the circumferential direction. The front end of the ball screw (12) passes through the corresponding expansion slot (5) and extends into the annular groove (13) of the ejector pin (3).

4. A device for dismounting a cage inner needle bearing of a gearbox housing according to claim 3, characterized in that: The inner hole of the limiting sleeve (11) is a frustum shape with a larger upper part and a smaller lower part.

5. A device for dismounting a cage of a needle bearing inside a gearbox housing according to claim 1, characterized in that: The outer side of the expansion sleeve (1) is stepped, and the diameter gradually increases from top to bottom. The wall thickness of the lower part of the expansion sleeve (1) is greater than that of the upper part.

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