Bearing removal tool

Abstract

Provide a bearing removal tool. [Solution] The device includes a main body having a cavity (14) for receiving high-pressure gas, and an impact block (21) and an actuating rod (31) that are driven by high-pressure gas to slide relative to each other. The actuating rod has a driving end (32) and an actuating end (33) that protrudes outside the main body. When high-pressure gas drives the impact block to move backward, it applies an impact to the actuating rod, causing it to move backward. A first blocking member (41) disposed on the actuating rod and the driving end define a distance over which the impact block can slide relative to each other. A second blocking member (42) is fixed to the actuating end. When the actuating rod slides following the impact block, the first and second blocking members abut against both ends of a blocking portion (19). When the impact block applies an impact to the actuating rod backward, a backward pulling impact force is generated.

Description

[Technical Field]

[0001] The present invention relates to power impact tools, and more particularly to bearing removal tools. [Background technology]

[0002] In conventional bearing removal work, a worker must hold a screwdriver in one hand, align it with the bearing to be removed, and use a hammer in the other to strike the screwdriver, the impact force of which gradually pushes the bearing out of the shaft hole. However, this conventional manual bearing removal method not only takes time and effort, but also makes it easy for a worker to accidentally strike their hand with a hammer, resulting in injury.

[0003] Conventional patent documents, for example, Patent Document 1 listed below, mainly describe a bearing removal tool in which a fastening member that can be fastened to the inner edge of a bearing is provided at the front end of a rod body, and a hammer body that can slide along the rod body is attached to the rod body, and the tool is held by hand and driven to impact the head that extends outward from the rear end of the rod body, generating a backward pulling impact force that gradually pulls backward a bearing that is tightly mounted in the shaft hole of a machine component. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Taiwan Registered Utility Model No. 573272 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although Patent Document 1 does not require the worker to prepare a hammer and screwdriver separately, it still has the problem of taking time and effort because the hammer body must be driven manually to deliver an impact to the head. Furthermore, the operation process requires the worker to hold the rear end of the rod body with one hand and drive the hammer body to deliver an impact to the head with the other, which is not only difficult to operate but also poses a safety issue in that the worker's hand may be struck by the hammer body.

[0006] Therefore, the present inventors believed that the above drawbacks could be improved, and as a result of extensive research, they came up with the proposal of the present invention, which effectively improves the above problems through rational design.

[0007] The present invention has been made in view of the above-mentioned conventional problems, and has as its main object to provide a bearing removal tool that can perform a removal operation on a threaded member that has been tightly driven into a workpiece. [Means for solving the problem]

[0008] In order to solve the above problems, the bearing removal tool of the present invention employs the following means. A bearing removal tool according to one aspect of the present invention comprises: a main body having a linear cavity and an intake duct formed therein, the cavity having a front portion communicating with a front end of the main body and a rear portion opposite the front portion, an air guide valve installed at the rear portion, the intake duct having both ends communicating with the front portion and the air guide valve, respectively, the air guide valve being used to select whether high-pressure gas is input from the rear portion or from the front portion via the intake duct, and a blocking portion formed at the front end of the main body and extending along the axial direction of the cavity, the blocking portion having a rear blocking surface facing the front portion and a front blocking surface opposite the rear blocking surface; an impact block slidably installed in the cavity, wherein when the high-pressure gas is input from the front part, the impact block is driven to slide toward the rear part, and when the high-pressure gas is input from the rear part, the impact block is driven to slide toward the front part, an insertion part is installed in the impact block along the axial direction, and a first extrusion part is formed on a rear side surface of the impact block facing the rear part; an actuating rod having a driving end inserted into the insertion portion and an operating end protruding out of the front end of the body, the driving end having a second protruding portion that presses against the first protruding portion; the actuating rod sliding toward the front or rear portion following the impact block; when the high-pressure gas is input from the front portion and the impact block is driven to slide toward the rear portion, the first protruding portion of the impact block impacts the second protruding portion of the actuating rod, driving the actuating rod to slide toward the rear portion; a first blocking member and a second blocking member installed at an interval are fixed to the actuating rod; a blocking member located in the front portion, a distance of movement between the first blocking member and the second extrusion portion that allows the impact block to slide relative to the actuating rod; the second blocking member fixed to the actuating end, a distance between the second blocking member and the first blocking member that is longer than the axial length of the blocking portion; an actuating rod that can drive the first blocking member to abut against the rear blocking surface when the actuating rod slides toward the front portion, and that can drive the second blocking member to abut against the front blocking surface when the actuating rod slides toward the rear portion.

[0009] At least the following points will become clear from the description and drawings to be described later. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an exploded view of a bearing removal tool according to one embodiment of the present invention. FIG. [Figure 2] 1 is a schematic diagram showing a combination of a bearing removal tool according to an embodiment of the present invention; [Figure 3] 1 is a schematic operational view showing a bearing removal tool according to an embodiment of the present invention; [Figure 4] 1 is a schematic operational view showing a bearing removal tool according to an embodiment of the present invention; [Figure 5] 1 is a schematic operational view showing a bearing removal tool according to an embodiment of the present invention; [Figure 6] 1 is a schematic operational view showing a bearing removal tool according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes in detail the embodiments of the present invention, but the present invention is not limited to these, and various modifications are possible within the scope of the description, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0012] First, a specific embodiment of a bearing removal tool according to the present invention will be described with reference to FIGS.

[0013] The present invention, which solves the above problems, mainly comprises a main body 1, an impact block 21, and an operating rod 31, each of which will be described below.

[0014] The body 11 has a front end 12 and a rear end 13, and can be manufactured in a pistol or straight-tube shape. The body 11 in this embodiment is shown as a pistol-shaped body. The body 11 has a hollow case shape, and is internally formed with a linear cavity 14 and an intake duct 15. A plurality of exhaust holes 16 communicating with the cavity 14 are formed around the periphery of the body 11. The cavity 14 has a front portion 141 communicating with the front end 12 of the body 11 and a rear portion 142 opposite the front portion 141. An air guide valve 17 is installed in the rear portion 142. Both ends of the intake duct 15 are connected to the front portion 141 and the air guide valve 17, respectively. The air guide valve 17 is used to select whether high-pressure gas is input from the rear portion 142 or from the front portion 141 via the intake duct 15. The main body 11 is provided with a control switch 18 for controlling whether high-pressure gas is allowed to enter the air guide valve 17. A through hole 121 communicating with the outside and the front portion 141 is formed in the front end 12 of the main body 11. A blocking portion 19 extending along the axial direction of the cavity 14 is formed by integrally protruding along the inner periphery of the through hole 121. The blocking portion 19 has a rear blocking surface 191 facing the front portion 141 and a front blocking surface 192 facing outward and opposite the rear blocking surface 191. In this embodiment, a sleeve 51 is further connected to the front end 12 of the main body 11, the sleeve 51 extending forward and having both ends open.

[0015] The impact block 21 is slidably housed in the cavity 14, separating a front portion 141 from a rear portion 142 thereof and preventing communication between the front portion 141 and the rear portion 142 of the cavity 14. The impact block 21 is driven by high-pressure gas input into the cavity 14, and slides linearly back and forth along the axial direction of the cavity 14. When high-pressure gas is input from the front portion 141, the impact block 21 is driven to slide toward the rear portion 142, and when high-pressure gas is input from the rear portion 142, the impact block 21 is driven in the opposite direction to slide toward the front portion 141. The impact block 21 is provided with an insertion portion 22 along the axial direction, and a first extrusion portion 23 is formed on a rear surface 212 of the impact block 21 facing the rear portion 142. In this embodiment, the first extrusion portion 23 is formed as a recess recessed in the rear surface 212 of the impact block 21, and the insertion portion 22 is formed as a via hole that opens in the axial direction from the impact block 21 toward the front surface 211 of the front part 141 and communicates with the first extrusion portion 23. The inner diameter of the first extrusion portion 23 is larger than the inner diameter of the insertion portion 22, and a first abutment surface 24 is formed at the joint between the first extrusion portion 23 and the insertion portion 22. More specifically, in this embodiment, the impact block 21 is formed with a spiral groove 25 that surrounds the outer circumferential surface of the impact block 21, one end of the spiral groove 25 communicates with the rear surface 212 of the impact block 21, and the other end of the spiral groove 25 does not communicate with the front surface 211 of the impact block 21. During most of the stroke of the impact block 21 sliding back and forth along the cavity 14 , the spiral groove 25 may be in communication with at least one exhaust hole 16 opened in the body 11 .

[0016] The actuating rod 31 is axially disposed in the cavity 14 and has a gap between it and the inner peripheral wall of the cavity 14. The actuating rod 31 has a driving end 32 inserted into the insertion portion 22 and an actuating end 33 protruding out of the front end 12 of the body 11. The actuating end 33 is provided with a tool connection portion 34 for connection to a bearing engagement tool (not shown), such as a hook or a fastener. The driving end 32 is formed with a second extrusion portion 35 that presses against the first extrusion portion 23, and the actuating rod 31 slides toward the front portion 141 or the rear portion 142 along with the impact block 21. In this embodiment, the second extrusion portion 35 has an end extending from the driving end 32 that expands outward to form a bump that is received in the first extrusion portion 23. A second abutting surface 36 that can abut against the first abutting surface 24 is formed at the connection point between the bump and the driving end 32. When high-pressure gas is input from the front part 141 of the cavity 14 via the intake duct 15 and the impact block 21 is driven to slide toward the rear part 142, the first abutment surface 24 of the first extrusion part 23 of the impact block 21 impacts the second abutment surface 36 of the second extrusion part 35 of the actuating rod 31, and the actuating rod 31 is driven by the impact block 21 to slide toward the rear part 142 of the cavity 14. When high-pressure gas is input from the rear part 142 of the cavity 14, the high-pressure gas drives the second abutment surface 36 of the actuating rod 31 to press against the first abutment surface 24 of the impact block 21, and the impact block 21 is driven by the actuating rod 31 to slide toward the front part 141 of the cavity 14 to return to its original position.

[0017] In addition, a first blocking member 41 and a second blocking member 42 are further fixed to the actuating rod 31 and are installed at a distance from each other. Preferably, a bushing 43 is further installed between the first blocking member 41 and the second blocking member 42. The bushing 43 covers the actuating rod 31 and abuts against the first blocking member 41 and the second blocking member 42. In this embodiment, the actuating rod 31 is provided with a threaded portion 311, and the first blocking member 41, the second blocking member 42, and the bushing 43 are respectively locked to the threaded portion 311 by a screw connection and abut against each other in a tight contact manner. The first blocking member 41 is located in the front portion 141, and a moving distance that allows the impact block 21 to slide relative to the actuating rod 31 is defined between the first blocking member 41 and the second pushing portion 35. The second blocking member 42 is fixed to the actuating end 33 and exposed to the outside of the body 11. The distance D between the second blocking member 42 and the first blocking member 41 is longer than the axial length d of the blocking portion 19 of the main body 11. When the actuating rod 31 moves toward the front portion 141, the first blocking member 41 can be driven to abut against the rear blocking surface 191. When the actuating rod 31 moves toward the rear portion 142, the second blocking member 42 can be driven to abut against the front blocking surface 192. This limits the maximum stroke that the actuating rod 31 can slide forward and backward. In this embodiment, the actuating end 33 of the actuating rod 31 penetrates a sleeve 51. A spring 52 is installed in the sleeve 51 and covers the actuating end 33. One end of the spring 52 abuts against the second blocking member 41, and the other end abuts against an abutment member 53, which is a C-shaped buckle, inside the sleeve 51. When high-pressure gas does not enter the cavity 14, the spring 52 supports the second blocking member 42 so that it abuts against the front blocking surface 192, thereby ensuring smooth circulation of high-pressure gas and switching of the air guide valve 17, and making its operation more convenient (see Figure 2).

[0018] When the present invention having the above-described structure is actually used, as shown in Figure 3, with the impact block 21 positioned at the front 141 of the cavity 14, the first blocking member 41 of the operating rod 31 is driven to abut against the rear blocking surface 191 of the blocking part 19, and the second blocking member 42 compresses the spring 52. At this time, high-pressure gas is input into the front 141 of the cavity 14 via the intake duct 15. 4, when high-pressure gas is input into the front portion 141 of the cavity 14, the impact block 21 is driven to slide toward the rear portion 142 of the cavity 14, and the first abutment surface 24 of the first extrusion portion 23 of the impact block 21 impacts the second abutment surface 36 of the second extrusion portion 35 of the actuating rod 31, generating a pulling impact force. At the same time, the actuating rod 31 is pushed to slide toward the rear portion 142, and the actuating rod 31 slides rearward until the second blocking member 42 abuts against the front blocking surface 192 of the blocking portion 19, whereupon the actuating rod 31 stops sliding. In this way, the bearing (not shown), which is tightly fitted in the shaft hole, is driven to be pulled outward by the pulling impact force generated by the impact block 21 colliding rearward with the actuating rod 31 at high speed.

[0019] 5, with the second blocking member 42 of the actuating rod 31 abutting against the front blocking surface 192 of the blocking portion 19 and the impact block 21 positioned at the rear portion 142 of the cavity 14, the air guide valve 17 switches its intake direction so that high-pressure gas is input from the rear portion 142 of the cavity 14. During the process in which the high-pressure gas drives the actuating rod 31 to slide toward the front portion 141 of the cavity 14, the second abutment surface 36 of the actuating rod 31 pushes the first abutment surface 24 of the impact block 21, causing the impact block 21 and the actuating rod 31 to simultaneously slide toward the front portion 141 of the cavity 14 and compressing the spring 52 again. When the first blocking member 41 of the actuating rod 31 abuts against the rear blocking surface 191 of the blocking portion 19 again, the actuating rod 31 stops sliding. 6, after the sliding of the actuating rod 31 stops, the high-pressure gas continues to drive the impact block 21 to slide toward the front part 141 of the cavity 14, and the high-pressure gas is gradually discharged outward through the exhaust hole 16, completing the returning operation of the impact block 21. In addition, in this embodiment, during the process of the impact block 21 sliding toward the front part 141 of the cavity 14, one end of the spiral groove 25 provided on the outer circumferential surface of the impact block 21 communicates with the rear side surface 212 of the impact block 21, and the high-pressure gas input from the rear part 142 of the cavity 14 is guided to be discharged outward through the exhaust hole 16 partially via the spiral groove 25. In this way, the impact force when the impact block 21 is reset is mitigated, and the bearing removal tool of the present invention achieves the effect of having the maximum impact force when the impact block 21 slides toward the rear 142 of the cavity 14 and the minimum impact force when the impact block 21 slides toward the front 141 of the cavity 14, thereby further providing a vibration-damping effect.

[0020] As can be seen from the above description, the bearing removal tool of the present invention uses high-pressure gas to drive the impact block 21 to slide back and forth within the cavity 14, and as the impact block 21 slides toward the rear 142 of the cavity 14, it is able to deliver an impact to the operating rod 31, generating an impact force that drives the operating rod 31 to move backward. In this way, a bearing that is tightly mounted in a shaft bore can be pulled outward in a labor-saving and efficient manner, not only avoiding the physical exertion required when removing a bearing using the conventional manual method, but also effectively solving the problem of accidental hitting and injury that occurs when using a manual hitting method, making the tool highly practical.

[0021] Although the embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0022] 11 Main unit 12 Front end 121 Through hole 13 Rear end 14 Cavity 141 Front 142 rear 15 Intake duct 16 Exhaust vent 17 Air guide valve 18 Control Switch 19 Blocking section 191 rear blocking surface 192 Front Blocking Surface 21 Impact Block 211 Front side 212 Posterior side 22 Insertion section 23 First extrusion section 24 First contact surface 25 Spiral groove 31 Actuating rod 311 Threaded part 32 Drive end 33 Operating End 34 Tool Joint 35 Second extrusion section 36 Second contact surface 41 first blocking member 42 second blocking member 43 Bushing 51 Sleeve 52 Spring 53 Contact member D distance d Axis length

Claims

1. A main body having a linear cavity and an intake duct formed therein, wherein the cavity has a front portion communicating with the front end of the main body and a rear portion opposite to the front portion, an air guide valve is installed in the rear portion, both ends of the intake duct are respectively communicated with the front portion and the air guide valve, the air guide valve is used to select and switch whether to input high-pressure gas from the rear portion or from the front portion through the intake duct, a blocking portion extending along the axial direction of the cavity is formed at the front end of the main body, and the blocking portion has a rear blocking surface facing the front portion and a front blocking surface opposite to the rear blocking surface, and the main body; An impact block slidably installed in the cavity, when high-pressure gas is input from the front portion, the impact block is driven to slide towards the rear portion, when high-pressure gas is input from the rear portion, the impact block is driven to slide towards the front portion, an insertion portion is installed along the axial direction on the impact block, and the impact block has a first extrusion portion formed on a rear side surface facing the rear portion. An operating rod having a driving end inserted into the insertion portion and an operating end protruding outside the front end of the main body, wherein the driving end has a second extrusion portion that presses against the first extrusion portion, and the operating rod follows the impact block and slides in the direction of the front portion or the rear portion. When high-pressure gas is input from the front portion and the impact block is driven to slide toward the rear portion, the first extrusion portion of the impact block impacts the second extrusion portion of the operating rod, driving the operating rod to slide in the direction of the rear portion. A first blocking member and a second blocking member are fixedly installed on the operating rod at intervals. The first blocking member is located in the front portion, and a slidable movement distance of the impact block relative to the operating rod is formed between the first blocking member and the second extrusion portion. The second blocking member is fixedly installed on the operating end, and the distance between the second blocking member and the first blocking member is longer than the axial length of the blocking portion. When the operating rod slides in the direction of the front portion, the first blocking member can be driven to abut against the rear blocking surface, and when the operating rod slides in the direction of the rear portion, the second blocking member can be driven to abut against the front blocking surface. A bearing removal tool characterized by comprising an operating rod.

2. The impact block is used to separate the front portion and the rear portion and prevent them from communicating. A spiral groove surrounding the outer peripheral surface of the impact block is provided on the impact block. One end of the spiral groove communicates with the rear side surface of the impact block, and the other end of the spiral groove does not communicate with the front side surface of the impact block facing the front portion of the impact block. In the process of the impact block sliding along the cavity, the spiral groove communicates with at least one exhaust hole provided in the main body. The bearing removal tool according to claim 1, characterized in that.

3. The bearing removal tool according to claim 1, characterized in that a tool joint portion connected to a bearing engagement tool is provided at the operating end.

4. A bushing is installed between the first blocking member and the second blocking member. The bushing is covered on the actuating rod and is in contact with the first blocking member and the second blocking member. The bearing removal tool according to claim 1, wherein the bushing is in contact with the first blocking member and the second blocking member.

5. A threaded portion is provided on the actuating rod. The first blocking member, the second blocking member, and the bushing are respectively locked to the threaded portion and are in contact with each other so as to be in close contact. The bearing removal tool according to claim 4, wherein the first blocking member, the second blocking member, and the bushing are in contact with each other so as to be in close contact.

6. The first extrusion portion is composed of a concave groove recessed in the rear side surface of the impact block. The insertion portion is formed by a hole axially opened from the impact block toward the front side surface of the front portion and communicated with the first extrusion portion. The inner diameter of the first extrusion portion is larger than the inner diameter of the insertion portion. A first contact surface is formed at the joint portion between the first extrusion portion and the insertion portion. The second extrusion portion forms a bump structure accommodated in the first extrusion portion by the extension of the end extending from the driving end spreading outward. A second contact surface is formed at the joint portion between the second extrusion portion and the driving end and is in contact with the first contact surface. The bearing removal tool according to claim 1, wherein the second contact surface is in contact with the first contact surface.

7. A through hole communicating with the outside and the front portion is opened at the front end of the main body. By integrally protruding along the inner peripheral edge of the through hole, the blocking portion extending along the axial direction of the cavity is formed. The bearing removal tool according to claim 1, wherein the blocking portion extending along the axial direction of the cavity is formed.

8. A sleeve extending forward and having both ends open is connected to the front end of the main body. The actuating end of the actuating rod penetrates through the sleeve. A spring covering the actuating end is provided inside the sleeve. One end of the spring abuts against the second blocking member, and the other end of the spring abuts against a contact member inside the sleeve. When high-pressure gas does not enter the cavity, the spring supports the second blocking member so as to be in contact with the front blocking surface. The bearing removal tool according to claim 1, wherein the spring supports the second blocking member so as to be in contact with the front blocking surface.

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