Bearing dismounting device

Abstract

The utility model provides a bearing dismounting device. The bearing dismounting device comprises a positioning platform, a positioning supporting piece and a limiting pull rod used for stretching into a gap between an inner ring and an outer ring of a bearing. The positioning platform is provided with a positioning hole and at least two oblong holes arranged around the circumferential direction of the positioning hole; the positioning supporting piece is in threaded connection with the positioning hole and comprises a supporting rod and a torsion assembly. The limiting pull rod is movably connected with the long round hole and comprises a limiting rotating piece and a limiting fixing piece, and a clamping head is arranged at the end, away from the positioning platform, of the limiting pull rod. According to the utility model, the positioning platform, the positioning support piece and the limiting pull rod are arranged, so that the bearing can be conveniently and efficiently disassembled; the force transmission path is reasonable, operation is easy and convenient, and meanwhile damage to the bearing or the transmission shaft and other parts can be avoided; the whole structure is simple, the conception is ingenious, manufacturing is easy, and using requirements of different working conditions can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical installation technical field, especially a bearing dismounting device. BACKGROUND

[0002] Bearing is the common component in mechanical equipment, especially ball bearing, is applied in various industry mechanical equipment in large quantities, when installing bearing, generally adopt heating assembly method to connect it with transmission shaft, to realize the transmission function of machinery. When bearing uses the stipulated period, need to overhaul or replace, but because bearing and transmission shaft adopt interference assembly, and install in the inside of mechanical equipment, it is extremely difficult to take out, the current common method is to adopt crowbar or cooperate with chisel and so on to dismount, or adopt destructive dismounting, the above-mentioned method not only has great operation difficulty, can easily cause part damage even scrap, and dismounting efficiency is low, causes very unfavorable influence to production operation. CONTENT OF UTILITY MODEL

[0003] To solve the above technical problem, the utility model provides a bearing dismounting device, which reduces the operation difficulty of bearing dismounting, improves the dismounting efficiency, and can avoid damage to the bearing or transmission shaft and other parts.

[0004] The utility model adopts the technical scheme: a bearing dismounting device, including positioning platform, positioning support piece and the limit pull rod for stretching into the clearance between the inner ring and the outer ring of bearing, the positioning platform is equipped with positioning hole and at least two long round holes around the circumferential direction of positioning hole, the positioning support piece is connected with the positioning hole screw, for resisting the transmission shaft of bearing inner side, the limit pull rod is movably connected with the long round hole, and one end away from the positioning platform is equipped with the clamping head for clamping with bearing to drive bearing to leave transmission shaft.

[0005] Further, the limit pull rod includes a limit rotating piece and a limit fixed piece, one end of the limit rotating piece is provided with the clamping head, the other end is detachably connected with one end of the limit fixed piece, the other end of the limit fixed piece passes through the long round hole and is fixed to the positioning platform.

[0006] Further, the limit fixed piece includes a connecting part, a fixed part and a step part arranged between the fixed part and the connecting part, the connecting part is threadedly connected with the limit rotating piece, one end of the fixed part passing through the long round hole is provided with a fastener, the step part is provided with an elastic member on the outside, and the two ends of the elastic member are pressed against the positioning platform and the connecting part respectively.

[0007] Further, the clamping head has different lengths in two directions, and can be converted in the two directions by rotating to stretch into the gap or clamp in the gap.

[0008] Further, the positioning support comprises a support rod and a torsion assembly, the support rod is threadedly connected with the positioning hole; the torsion assembly is arranged at one end of the support rod away from the limiting pull rod, and is used for driving the support rod to rotate.

[0009] Further, the torsion assembly comprises a sleeve and a torsion rod, the sleeve is sleeved at one end of the support rod, and the torsion rod is oppositely arranged on the outer wall of the sleeve.

[0010] Further, the sleeve is provided with a limiting clamp used for limiting movement of the sleeve along the support rod.

[0011] Further, the torsion rod is a telescopic rod.

[0012] Further, the support pad is further arranged between the support rod and the transmission shaft.

[0013] The utility model has the advantages and positive effects that:

[0014] (1) the positioning platform, the positioning support and the limiting pull rod in the utility model cooperate, the positioning support can be rotated to abut on the transmission shaft in the bearing to be disassembled, so that the positioning platform and the limiting pull rod are driven to move away from the transmission shaft, the bearing is subjected to the tension of the limiting pull rod, gradually separates from the transmission shaft, and the convenient and efficient disassembly of the bearing is realized; in the process of disassembly, only the positioning support needs to be rotated, the force transmission path is reasonable, operation is simple, the operation difficulty of bearing disassembly is reduced, the disassembly efficiency is improved, and the bearing or transmission shaft and other parts can be prevented from being damaged.

[0015] (2) the whole structure is simple, ingenious and easy to manufacture, the limiting pull rod and the positioning support are designed as a split structure, the use requirement of different working conditions can be met, the application range of the device is improved, the turnover use is realized, and the manufacturing cost is reduced. DRAWINGS

[0016] Figure 1 is a structural schematic diagram of one specific embodiment of the utility model;

[0017] Figure 2 is a top view schematic diagram of one specific embodiment of the utility model;

[0018] Figure 3 is a positioning platform structure schematic diagram of one specific embodiment of the utility model;

[0019] Figure 4 is a limiting pull rod structure schematic diagram of one specific embodiment of the utility model;

[0020] Figure 5 is a schematic view of the position relationship between the clamping head and the bearing of one specific embodiment of the utility model;

[0021] Figure 6 is a schematic view of the structure of the positioning support of one specific embodiment of the utility model;

[0022] Figure 7 is a schematic view of the structure of the torsion assembly of one specific embodiment of the utility model;

[0023] Figure 8 is a schematic view of the use of one specific embodiment of the utility model;

[0024] in the figure,

[0025] 1, positioning platform, 11, positioning hole, 12, long circular hole, 13, connecting hole, 2, limiting pull rod, 21, limiting rotating part, 211, clamping head, 22, limiting fixing part, 221, connecting part, 222, fixed part, 223, step part, 224, elastic part, 225, fastener, 3, positioning support, 31, support rod, 32, torsion assembly, 321, outer sleeve, 322, torsion rod, 323, reset button, 324, limiting card, 4, connecting part, 5, bearing, 51, inner ring, 52, outer ring, 53, ball, 6, transmission shaft, 7, support pad, 8, mechanical equipment. DETAILED DESCRIPTION

[0026] The embodiments of the utility model will be described below in combination with the drawings.

[0027] As Figures 1 to 7 shown, the utility model embodiment provides a bearing dismounting device for dismounting bearing from the transmission shaft 6 of the inner side of bearing 5, and specifically includes positioning platform 1, positioning support 3 and limiting pull rod 2 for extending into the gap between inner ring 51 and outer ring 52 of bearing 5; Positioning platform 1 is equipped with positioning hole 11 and at least two long circular holes 12 circumferentially arranged around positioning hole 11; Positioning support 3 is threadedly connected with positioning hole 11 and is used for abutting against transmission shaft 6 of the inner side of bearing 5; Limiting pull rod 2 is movably connected with long circular hole 12, and the end away from positioning platform 1 of limiting pull rod 2 is equipped with clamping head 211 for clamping with bearing 5 to drive bearing 5 to leave transmission shaft 6.

[0028] In the embodiment, the bearing 5 is used for dismounting from the mechanical equipment 8 for maintenance or replacement; the bearing 5 comprises an inner ring 51 and an outer ring 52, and a gap is arranged between the inner ring 51 and the outer ring 52; one end of the bearing 5 has an opening communicated with the gap, the limiting pull rod 2 in the application can enter the gap between the inner ring 51 and the outer ring 52 through the opening of the bearing 5, and is clamped in the gap through the clamping head 211; in use, one end of the positioning support 3 abuts against the transmission shaft 6, and the clamping head 211 of the limiting pull rod 2 is clamped on the bearing 5; when the positioning support 3 is rotated, the length between the positioning platform 1 and the transmission shaft 6 increases, and then the positioning platform 1 moves away from the transmission shaft 6, so as to drive the limiting pull rod 2 to move away from the transmission shaft 6, the bearing 5 is subjected to the pulling force of the limiting pull rod 2, and gradually separates from the transmission shaft 6 with the rotation of the rotating rod, and finally the bearing 5 is dismounted; in the dismounting process, only the positioning support 3 needs to be rotated, the force transmission path is reasonable, the operation is simple, the operation difficulty of dismounting the bearing 5 is reduced, the dismounting efficiency is improved, and the damage of the bearing 5 or the transmission shaft 6 and other parts can be avoided.

[0029] Considering that the transmission shaft 6 is usually a circular structure, the gap between the inner ring 51 and the outer ring 52 of the bearing 5 usually has a circular cross section, and the center of the circular cross section is coaxially arranged with the axis of the transmission shaft 6; in order to ensure the uniformity of the force of each part of the bearing 5, the positioning support 3 abuts against the axis of the transmission shaft 6 in use, and the limiting pull rod 2 is at least two which are uniformly arranged along the circumference of the positioning support 3, preferably, the limiting pull rod 2 is three, and is arranged at an interval of 120 degrees with the axis of the positioning support 3 as the center;

[0030] In the above embodiment, as shown in Figure 2 and Figure 3 The positioning platform 1 in the application is provided with long circular holes 12 which are matched with the number of the limiting pull rod 2 and are arranged circumferentially around the positioning hole 11, and the long circular holes 12 have a certain length in the circumferential direction, so that the positioning platform 1 can provide a certain adjustment space in the circumferential direction, so that each limiting pull rod 2 can freely adjust its position to adapt to possible working condition changes, allowing the limiting pull rod 2 to have a certain degree of position deviation in the gap of the bearing 5, and maximizing the uniformity of the distribution of the limiting pull rod 2, thereby improving the stability and reliability of the overall structure.

[0031] In the above embodiment, considering the effective working stroke of the positioning platform 1, the length of the positioning support 3 is greater than the sum of the length of the limiting pull rod 2 and the length of the bearing 5 immersed in the transmission shaft 6, so as to ensure that the limiting pull rod 2 can be moved far enough to separate the bearing 5 from the transmission shaft 6 by rotating the positioning support 3.

[0032] Further, in the embodiment of the application, as shown in Figure 4As shown, the limiting pull rod 2 comprises a limiting rotating piece 21 and a limiting fixed piece 22, one end of the limiting rotating piece 21 is provided with a clamping head 211, the other end is detachably connected with one end of the limiting fixed piece 22, the other end of the limiting fixed piece 22 passes through the long circular hole 12 and is fixed to the positioning platform 1. By designing the limiting pull rod 2 as a split structure, the same limiting fixed piece 22 can be matched with different limiting rotating pieces 21, when the gap size of the bearing 5 to be disassembled is different, the limiting rotating piece 21 with the clamping head 211 matched with the gap can be connected to the limiting fixed piece 22, which improves the application range of the limiting pull rod 2, reduces the processing of the limiting fixed piece 22, and saves the manufacturing cost.

[0033] Further, in the embodiment of the present application, as shown in Figure 4 The limiting fixed piece 22 comprises a connecting part 221, a fixed part 222 and a stepped part 223 arranged between the fixed part 222 and the connecting part 221; the connecting part 221 is threadedly connected with the limiting rotating piece 21; one end of the fixed part 222 passing through the long circular hole 12 is provided with a fastener 225; the stepped part 223 is externally sleeved with an elastic piece 224, and the two ends of the elastic piece 224 are respectively pressed against the positioning platform 1 and the connecting part 221. The stepped part 223 and the elastic piece 224 are used to cooperate with the fastener 225 after the fixed part 222 passes through the long circular hole 12, the elastic piece 224 is in a compressed state to form a preliminary pre-tightening to fixedly connect the limiting fixed piece 22 with the positioning platform 1, and at the same time, it is convenient to adjust the length of the limiting fixed piece 22 on the other side of the positioning platform 1 by adjusting the fastener 225, so that the length of the limiting fixed piece 22 and the limiting rotating piece 21 is adapted to the bearing 5, and the clamping head 211 can extend into the gap between the inner ring 51 and the outer ring 52 of the bearing 5.

[0034] In a specific embodiment, as shown in Figure 4 The limiting rotating piece 21 is a rod-shaped structure with a set length, one end of the length direction is the clamping head 211, the other end is provided with an external thread, the diameter of the end where the clamping head 211 is located is smaller than the external thread section, and the rod body between the clamping head 211 and the external thread is designed to have an edge shape, such as a square, a rectangle or a hexagon, so as to facilitate the operator to hold the rod body and threadedly connect it with the limiting fixed piece 22.

[0035] In the above embodiment, as shown in Figure 4As shown, the limiting fixing member 22 is also a rod-shaped structure with a set length, one end of the length direction is a connecting part 221, the connecting part 221 is provided with an internal thread matched with the external thread of the limiting rotating member 21, and the external shape of the connecting part 221 is also a shape with edges, so as to facilitate the operator to hold and rotate; the other end of the length direction is a fixed part 222, the fixed part 222 is provided with an external thread, and the fastener 225 is a bolt matched with the fixed part 222, so as to fix the fixed part 222 on the positioning platform 1; the elastic member 224 adopts a spring, the stepped part 223 has the same shape as the fixed part 222, which is smaller than the connecting part 221, so that the elastic member 224 can press against the connecting part 221 and the positioning platform 1, and realize the pre-tightening of the limiting fixing member 22.

[0036] Further, in the embodiment of the present application, as shown in Figure 5 The clamping head 211 has different lengths in two directions, and can be converted in the two directions by rotating to penetrate into the gap between the inner ring 51 and the outer ring 52 or be clamped in the gap. That is to say, when the clamping head 211 is in one direction, it can penetrate into the gap between the inner ring 51 and the outer ring 52 from the opening of the bearing 5, and when the clamping head 211 is in the other direction, it can be clamped in the gap; preferably, the clamping head 211 is a flat semicircular or square structure, has a plane perpendicular to the axis direction of the limiting rotating member 21, and the lengths in the two directions of the plane are different, one of which is greater than the opening of the bearing 5, and the other of which is smaller than the opening of the bearing 5; when it is needed to penetrate the clamping head 211 into the gap of the bearing 5, the clamping head 211 is adjusted so that the smaller length is arranged along the radial direction of the bearing 5, and when it is needed to clamp the clamping head 211 in the gap, it is only needed to rotate the limiting rotating member 21, so that the posture of the clamping head 211 is converted to arrange the larger length along the radial direction of the bearing 5, so that the clamping head 211 is clamped in the gap of the bearing 5, realizes the transmission of the pulling force to the bearing 5, and drives the bearing 5 to move away from the transmission shaft 6.

[0037] Further, in the embodiment of the present application, as shown in Figure 6 The positioning support 3 includes a support rod 31 and a torsion assembly 32, the support rod 31 is threadedly connected with the positioning hole 11; the torsion assembly 32 is arranged at one end of the support rod 31 away from the limiting pull rod 2, and is used to drive the support rod 31 to rotate. By arranging the positioning support 3 as a split structure, different lengths of the support rod 31 matched with the torsion assembly 32 can be used according to different working conditions; by rotating the torsion assembly 32, the support rod 31 can be driven to rotate synchronously to abut against the transmission shaft 6, so that the positioning platform 1 moves away from the transmission shaft 6 along the support rod 31, and the bearing 5 is driven to be separated from the transmission shaft 6 by the limiting pull rod 2, and the disassembly of the bearing 5 is completed.

[0038] In the above embodiment, the torsion assembly 32 comprises an outer sleeve 321 and torsion rods 322, the outer sleeve 321 is sleeved on one end of the support rod 31, and the torsion rods 322 are oppositely arranged on the outer wall of the outer sleeve 321. In order to realize the cooperation of the torsion assembly 32 and the support rod 31, and ensure that the support rod 31 rotates synchronously when the torsion assembly 32 rotates, one end of the support rod 31 and the outer sleeve 321 are preferably designed as a square or other regular polygonal structure; the torsion rods 322 are at least two and oppositely arranged on the outer wall of the outer sleeve 321, and the operator can conveniently rotate the support rod 31 by holding the torsion rods 322.

[0039] In a specific embodiment, as shown in Figure 7 The outer sleeve 321 is provided with a limiting card 324 for limiting the movement of the outer sleeve 321 along the support rod 31; the specific structure of the limiting card 324 is not limited here, for example, the outer sleeve 321 is provided with a cavity matched with one end of the support rod 31, the limiting card 324 is arranged at the opening of one side of the cavity, the support rod 31 is inserted into the cavity from the other opening and abuts against the limiting card 324; or one end of the support rod 31 and the outer sleeve 321 are provided with a through hole matched with each other, the limiting card 324 passes through the through hole to fix the support rod 31 inside the outer sleeve 321, or other structures capable of fixing and limiting the outer sleeve 321 and the support rod 31 are adopted;

[0040] In a specific embodiment, the torsion rods 322 are telescopic rods, when the friction between the inner sleeve of the bearing 5 and the transmission shaft 6 is large, the length of the torsion rods 322 can be adjusted to be elongated to increase the rotating force arm, so as to reduce the operation difficulty of the worker by increasing the torque. Further, as shown in Figure 1 and Figure 2 The positioning platform 1 is also provided with a connecting hole 13, through which a connecting piece 4 convenient for being held by a hand can be installed, so that in the process of disassembly, an external force is applied to the positioning platform 1 through the connecting piece 4, so that the positioning platform 1 does not rotate with the support rod 31 when the support rod 31 rotates, so as to ensure the stability of the whole device; specifically, the connecting piece 4 can adopt a rod piece combination structure in the shape of F, comprising a long rod and two parallel short rods perpendicularly arranged at one end of the long rod, the connecting hole 13 on the positioning platform 1 is matched with the two parallel short rods, and by holding the other end of the long rod, the rotation or torsion of the positioning platform 1 can be limited.

[0041] In a specific embodiment, the torsion rods 322 are a multi-section telescopic rod nested structure, each telescopic rod is provided with an adjusting hole at both ends, and a reset button 323 is arranged in each hole, so that the length of the telescopic rod can be conveniently adjusted by pressing the reset button 323, and locked after adjustment. Preferably, the reset button 323 adopts a guide cylinder, a spring and a pressing piece, which is a common structure in the prior art and will not be described here.

[0042] Further, in one specific embodiment, as shown in Figure 1 and Figure 8 The bearing dismounting device also includes a support pad 7 arranged between the support rod 31 and the transmission shaft 6 to avoid the support rod 31 from rubbing against the transmission shaft 6 when rotating.

[0043] The limiting pull rod 2 and the support rod 31 in the application are both made of high-strength round steel, the positioning platform 1 is made of thick steel plate, and the torsion assembly 32 is made of thick steel plate and thick-walled steel pipe, which have good rigidity and are easy to process.

[0044] The use method of the bearing dismounting device, in one specific embodiment, as shown in Figure 8 The bearing 5 is a ball bearing 53, and is fixed on the mechanical equipment 8. The inner side of the bearing 5 is provided with a transmission shaft 6. The use process includes the following steps:

[0045] S1, threadedly connecting the limiting rotating part 21 and the limiting fixed part 22 to form the limiting pull rod 2;

[0046] Specifically, the end of the limiting rotating part 21 provided with external threads is screwed into the connecting part 221 of the limiting fixed part 22 to ensure stable connection and form the limiting pull rod 2;

[0047] S2, inserting the clamping head 211 of the limiting pull rod 2 into the gap between the inner ring 51 and the outer ring 52 of the bearing 5 to be dismounted at a set interval, and rotating the limiting pull rod 2 by a set angle to make the clamping head 211 clamped in the gap;

[0048] Specifically, the number of limiting pull rods 2 in the embodiment is three. The three limiting pull rods 2 are respectively inserted into the gap between the inner ring 51 and the outer ring 52 of the bearing 5 to be dismounted at an interval of 120 degrees, and then the limiting pull rod 2 is rotated by 90 degrees to make the clamping head 211 clamped in the gap after rotation;

[0049] S3, installing the positioning platform 1 on the limiting pull rod 2 through the long circular hole 12, and fixing the limiting pull rod 2 through the fastener 225;

[0050] Specifically, the fixed part 222 of the three limiting pull rods 2 is respectively inserted through the long circular hole 12 on the positioning platform 1, and the fastener 225 is installed at the end of the insertion. The length of the limiting pull rod 2 on the other side of the positioning platform 1 is adjusted to make the elastic member 224 in a compressed state.

[0051] S4, installing the support rod 31 in the positioning hole 11 to make one end of the support rod 31 close to the transmission shaft 6 on the inner side of the bearing 5, and placing the support pad 7 between the support rod 31 and the transmission shaft 6;

[0052] Specifically, in the process of screwing the support rod 31, one end of the support rod 31 gradually approaches the transmission shaft 6, and before the end of the support rod 31 contacts the transmission shaft 6, the support pad 7 is placed at a position corresponding to the end of the support rod 31 on the transmission shaft 6, and then the support rod 31 is continuously screwed until the support rod 31 abuts against the support pad 7.

[0053] S5, the torsion assembly 32 is sleeved on the other end of the support rod 31;

[0054] S6, the torsion assembly 32 is screwed to make the support rod 31 abut against the transmission shaft 6, drive the positioning platform 1 and the limiting pull rod 2 away from the transmission shaft 6, and make the bearing 5 disengage from the transmission shaft 6.

[0055] Specifically, the support rod 31 is continuously rotated by the torsion assembly 32, when the friction force between the inner sleeve of the bearing 5 and the transmission shaft 6 is large, the length of the torsion rod 322 can be adjusted to be elongated to increase the rotation force arm, and the connecting piece 4 is installed on the connecting hole 13 of the positioning platform 1, and the worker holds the connecting piece 4 by hand to make the positioning platform 1 and the limiting pull rod 2 move stably until the bearing 5 completely disengages from the transmission shaft 6, and the disassembly of the bearing 5 is completed.

[0056] The positioning platform, the positioning support and the limiting pull rod in the utility model are matched, the positioning support can be rotated to abut against the transmission shaft on the inner side of the bearing to be disassembled, so that the positioning platform and the limiting pull rod are driven to move away from the transmission shaft, the bearing is subjected to the pulling force of the limiting pull rod, and gradually disengages from the transmission shaft, the convenient and efficient disassembly of the bearing is realized, only the positioning support needs to be rotated in the process of disassembly, the force transmission path is reasonable, the operation is simple, the operation difficulty of the bearing disassembly is reduced, the disassembly efficiency is improved, and the damage of the bearing or the transmission shaft and other parts can be avoided.

[0057] The utility model discloses whole simple structure, clever design, easy to make, through the limiting pull rod and the positioning support design is the split type structure, can satisfy the use demand of different working conditions, improved the application scope of device, realized the turnover use, reduced the manufacturing cost.

[0058] The embodiments of the utility model are described in detail above, but the content is only the preferred embodiment of the utility model, and cannot be considered as being used to limit the implementation scope of the utility model. Any equivalent change and improvement within the application scope of the utility model should still belong to the patent coverage scope of the utility model.

Claims

1. A bearing puller, characterized by, The positioning platform is provided with a positioning hole and at least two long circular holes arranged circumferentially around the positioning hole; the positioning support is threadedly connected with the positioning hole and used for abutting against a transmission shaft inside the bearing; the limiting pull rod is movably connected with the long circular hole, and an end thereof away from the positioning platform is provided with a clamping head used for clamping the bearing to drive the bearing away from the transmission shaft.

2. The bearing puller of claim 1, wherein: The limiting pull rod comprises a limiting rotating member and a limiting fixing member, one end of the limiting rotating member is provided with the clamping head, and the other end is detachably connected with one end of the limiting fixing member, and the other end of the limiting fixing member penetrates through the long circular hole and is fixed to the positioning platform.

3. The bearing puller of claim 2, wherein: The limiting fixing member comprises a connecting portion, a fixing portion and a step portion arranged between the fixing portion and the connecting portion; the connecting portion is threadedly connected with the limiting rotating member; one end of the fixing portion penetrating through the long circular hole is provided with a fastener; an elastic member is sleeved outside the step portion, and two ends of the elastic member are respectively abutted against the positioning platform and the connecting portion.

4. A bearing puller according to any one of claims 1 to 3, wherein: The clamping head has different lengths in two directions and can be switched in the two directions by rotation to extend into the gap or be clamped in the gap.

5. The bearing puller of any one of claims 1-3, wherein: The positioning support comprises a supporting rod and a torsion assembly, the supporting rod is threadedly connected with the positioning hole; the torsion assembly is arranged at one end of the supporting rod away from the limiting pull rod and used for driving the supporting rod to rotate.

6. The bearing puller of claim 5, wherein: The torsion assembly comprises an outer sleeve and a torsion rod, the outer sleeve is sleeved at one end of the supporting rod, and the torsion rod is oppositely arranged on the outer wall of the outer sleeve.

7. The bearing puller of claim 6, wherein: The outer sleeve is provided with a limiting clamp used for limiting movement of the outer sleeve along the supporting rod.

8. A bearing puller according to claim 6 or 7, characterised in that: The torsion rod is a telescopic rod.

9. The bearing dismounting device according to claim 8, characterized in that: Further comprising a supporting pad used for being arranged between the supporting rod and the transmission shaft.

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