JPH0621865U - Bearing puller - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to reliably engage the bearing at the tip of the arm of the bearing puller and to reliably disengage the bearing from the shaft. [Structure] In a claw attachment 29 attached to the tip of the bearing puller 20, a structure is provided in which a claw 33 is supported in a state of facing a catch claw 31.
Is adjusted to move along the support hole 32 penetrating in the direction of the arrow Y, and is inserted into the ring-shaped hole 37 in the end surface of the bearing 2. The engaging claw 33 engaged with the ring-shaped hole 37 is
By abutting and engaging the outer portion inner wall 38 of the bearing 2, and tightening the bolt 36 in this state, the outer ring portion of the bearing 2 can be held together with the hooking claws 31 that are arranged opposite to each other. As a result, the bearing 2 is securely held at the tip of the arm 26, and the bearing 2 can be reliably separated from the shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing puller for removing a bearing from a shaft.

[0002] As a conventional bearing puller, for example, there is one disclosed in Japanese Utility Model Publication No. 55-10057 proposed by the applicant. This bearing puller is arranged at the center of the base body, which is arranged to face the bearing mounted on the shaft, and is movable along the axial direction of the shaft arranged to face the base body. Screw shaft that abuts against the end of the shaft and exerts a pressing force in the axial direction on the shaft, and the base end is pin-connected to the base body, and the tip end is a groove for fitting the snap ring on the outer peripheral surface of the bearing. Also, it is composed of two arms with hooking claws that can be hooked on the shoulder. When removing the bearing ring from the shaft using this bearing puller, first insert the hooking claw at the tip of the arm into the groove for fitting the snap ring of the bearing, and then screw the screw shaft with respect to the base body to screw. The tip of the shaft is brought into contact with the end of the shaft on which the bearing is hooked. As a result, the pressing force of the screw shaft is applied to the shaft, and the bearing is pulled out from the shaft by the hooking claw.

However, according to the bearing puller having such a configuration, since the base end portion of the arm is only pin-coupled to the base body, when a pressing force is applied to the shaft by the screw shaft, the arm has the base end portion of the pin. There was a problem that the joint was opened around the center. That is, in each arm, the hooking claw at the tip end opens in the direction in which it disengages from the groove for fitting the snap ring, which may cause a problem that the bearing cannot be pulled out.

Therefore, the applicant has conventionally proposed an improved bearing puller shown in FIG. In the figure, 1 is a shaft, 2 is a bearing, and 3 is a groove for fitting the snap ring of the bearing 2. The bearing puller 4 has a base 6 which is arranged opposite to the bearing 2 and has a support piece 5 arranged in a direction orthogonal to the axial direction of the shaft 1. A screw shaft 7 is screwed onto the center of the base body 6, and the screw shaft 7 is screwed in the direction of arrow A along the axial direction of the shaft 1. Pin holes 8 are formed at appropriate intervals in the support piece 5 extending left and right around the screw shaft 7. An arm 10 having a hooking claw 9 at its tip is supported by each supporting piece 5. The arm 10 is provided with a pin hole at the base end thereof. With the hooking claw 9 of the arm 10 engaged in the snap ring fitting groove 3 of the bearing 2, the pin hole of the arm 10 and the support piece 5 are inserted. The pin 11 is inserted into each pin hole in association with the pin hole 8. Then, the base end of each arm 10 is pin-connected to the support piece 5. In this state, the tip ends of the pair of arms 10 are further connected by the connecting piece 12. The connecting piece 12 is arranged in parallel with the supporting piece 5 of the base body 6, and is provided with bolt insertion holes 13 at both ends at appropriate intervals. A bolt 14 is inserted into a bolt insertion hole 13 of each of the bolt insertion holes 13 at a position corresponding to the arm 10 arranged in parallel with the screw shaft 7, and the bolt 14 is formed on the tip side of the arm 10. It is screwed into a hole (not shown). In this way, the screw shaft 7 is screwed in the direction of arrow B with both ends of the connecting piece 12 connected to the distal ends of the respective arms 10, and the screw shaft 7 is screwed in the center hole 15 at the end of the shaft 1 to the distal end of the shaft 7. The formed sharp edges 16 are abutted against each other, and a pressing force is applied to the shaft 1. Then, the bearing 2 is pulled in the direction of the arrow C (axial direction) by the hooking claw 9, and the bearing 2 can be separated from the shaft 1. At this time, since the tip side of each arm 10 is connected by the connecting piece 12, the hooking claw 9 does not fall off from the snap ring fitting groove 3 of the bearing 2 unlike the above-mentioned bearing puller before improvement. The bearing 2 can be disengaged.

[0005]

[Problems to be solved by the device]

 However, even in such an improved bearing puller 4, when the axial direction of the shaft 1 and the axial direction of the screw shaft 7 do not correspond to each other, each screw arm 7 applies a pressing force to the shaft 1, 10 may be tilted in the twisting direction (direction of arrow D) around the pin coupling portion (point P), and the hooking claw 9 may fall out of the snap ring fitting groove 3. Further, since the pin holes 8 formed in the support piece 5 and the bolt insertion holes 13 formed in the connecting piece 12 are only provided at appropriate intervals in the direction orthogonal to the axial direction, bearings of all diameters are provided. In response to this, it is difficult to arrange the screw shaft 7 and each arm 10 arranged in the axial direction in parallel, and in the bearing puller 4 of this kind, the arm 10 and the screw shaft 7 are arranged in parallel. Otherwise, the tip of the arm 10 would be shaken during the pressing work, and the hooking claw 9 would easily fall out of the groove 3.

The present invention was made in view of the above-mentioned conventional problems, and an object of the present invention is to reliably engage the bearing at the tip of the arm and to reliably disengage the bearing from the shaft. It is what

[0007]

[Means for achieving the object]

 In order to achieve the above object, the present invention is arranged at the tip of each arm so as to face the hooking claw, is supported by the arm so as to be movable in the radial direction with respect to the shaft, and is inserted into a ring-shaped hole on the end surface of the bearing. The bearing outer ring portion in the ring-shaped hole is brought into contact with and engaged with the inner wall of the bearing outer ring portion, and a hooking claw arranged oppositely is provided as well as an engaging claw capable of holding the outer ring portion of the bearing.

[0008]

[Action]

 According to the present invention, the engaging claw is arranged to face the hooking claw provided at the tip of each arm, and the engaging claw is supported by the arm so as to be movable in the radial direction with respect to the shaft. It is possible to adjust the movement so that the engaging claw is engaged with the ring-shaped hole on the end surface of the ring. After the engaging claws are engaged in the ring-shaped holes, the movement of the engaging claws is adjusted so as to abut and engage with the inner wall of the outer ring of the bearing. It is possible to hold the outer ring part of the. In this way, the bearing is securely engaged and held at the tip of each arm, and if the pressing body exerts a pressing force on the shaft in this state, the bearing can be reliably disengaged from the shaft. It will be possible.

[0009]

【Example】

 1 to 3 show a bearing puller according to an embodiment of the present invention. In the figure, 1 is a shaft, 2 is a bearing, and 3 is a groove for fitting the snap ring of the bearing 2 (see FIGS. 1 and 3). The bearing puller 20 is arranged opposite to the bearing 2 and includes a screw shaft 21 arranged at the center in the axial direction (X direction) of the shaft 1. The screw shaft 21 is screwed into a screw hole formed in the center of the base body 22 and is movable with respect to the base body 22 in the axial direction of the shaft 1. The base 22 has a pair of left and right support pieces 23 extending in a direction (Y direction) orthogonal to the axial direction (X direction) of the shaft 1. Each support piece 23 is formed with a slit 24 along the Y direction, and a step 25 is formed at the outer end of each slit 24. The base end of the arm 26 is inserted into the slit 24 of each support piece 23 as shown by the arrow E in FIG. A pin hole 27 is formed in the base end portion of the arm 26, and a pin 28 can be inserted into the pin hole 27 as shown in FIG. The arm 26 having the pin 28 inserted into the pin hole 27 is slidable along the slit 24 of the support piece 23 in the radial direction (Y direction) with respect to the screw shaft 21. That is, the arm 26 is slid in a state in which the pin 28 slides on the upper surface of the support piece 23, and the sliding on the outer side in the radial direction (Y direction) is restricted by the step portion 25. A pair of arms 26 arranged outside the screw shaft 21 has a hook attachment 29 attached to the tip thereof. The claw attachment 29 is attached to the tip of each arm 26 by a bolt 30. The claw attachment 29 is inserted into the snap ring fitting groove 3 of the bearing 2 at the lower position of the claw attachment 29 so that the claw attachment 29 can be hooked on the bearing 2. The claw 31 is formed. Further, the claw attachment 29 is provided with a support hole 32 which is provided in the radial direction (Y direction) with respect to the screw shaft 21 (see FIG. 3). A base end portion of an engaging claw 33 arranged to face the hooking claw 31 is inserted into the support hole 32. A screw 34 is provided at the base end of the engaging claw 33, and a spacer 35 is inserted outside the claw attachment 31 into the screw 34 that is inserted through the support hole 32. A nut 36 is screwed to the outside of the spacer 35. To be done. The engaging claw 33 attached to the claw attachment 31 is moved and adjusted in the radial direction (Y direction) with respect to the shaft 1 by tightening and loosening the nut 36 (see FIG. 1).

When the bearing puller 20 formed in this way separates the bearing 2 mounted on the shaft 1 from the shaft 1, first, the tip end of the screw shaft 21 is abutted against the end of the shaft 1. Then, the axial direction of the screw shaft 21 is made to correspond to the axial direction of the shaft 1. Subsequently, the base end portion of the arm 26 formed by inserting the pin 28 into the pin hole 27 is inserted into the slit 24 as shown by the arrow E, so that the base end portion of the arm 26 is supported by the support piece 23. Subsequently, the base end of the engaging claw 33 is inserted into the support hole 32 of the claw attachment 29 attached to the tip of the arm 26. The engaging claw 33 is engaged with a ring-shaped hole 37 formed in the end surface of the bearing 2 as shown in FIG. 3, and abuts against the bearing outer portion inner wall 38 in the ring-shaped hole 37. That is, the engaging pawl 33 is engaged with the pawl attachment 29 in the ring-shaped hole 37 while moving in the arrow Y direction along the support hole 32, and abuts and engages with the inner wall 38 of the bearing outer ring portion. When the engaging claw 33 is thus engaged with the inner wall 38 of the bearing outer ring portion, the hook claw 31 is then inserted into the groove 3 for fitting the snap ring of the bearing 2, and in this state, the screw at the base end of the engaging claw 33 is inserted. The nut 36 screwed to the screw 34 is tightened. As a result, the outer ring portion of the bear ring 2 is held by the hooking claws 31 and the engaging claws 33 which are arranged to face each other as shown in FIG. In this state, a handle or impact wrench is attached to the base end of the screw shaft 21 and the screw shaft 21 is rotated to apply a pressing force in the direction of arrow F to the shaft 1 from the tip of the screw shaft 21. Therefore, the bearing 2 held between the hooking claw 31 and the engaging claw 33 is pulled out from the shaft 1 along the axial direction (X direction).

Next, the operation of the above embodiment will be described. According to the bearing puller 20 according to the above-described embodiment, the engaging claw 33 is attached to the claw attachment 29 attached to the tip of the arm 26 so as to face the hooking claw 31. It is possible to engage the ring-shaped hole 37 in the end face of the bearing 2 while adjusting the movement in the direction of the arrow Y. Furthermore, the engaging claw 33 engaged with the ring-shaped hole 37 is brought into contact with and engages with the inner wall 38 of the bearing outer ring portion, and the outer ring portion of the bearing 2 can be held together with the hooking claw 31 that is arranged to face the bearing. Become. Therefore, the bearing 2 is securely engaged and held at the tip of each arm 26, and the bearing 2 can be reliably disengaged from the shaft 1. Further, according to the bearing puller 20 according to the above-described embodiment, since the base end portion of the arm 26 can slide in the arrow Y direction along the slit 24 of the support piece 23, the arm 26 is parallel to the axial direction of the shaft 1. Can be set, and the force in the twisting direction does not act on the arm 26 during the pulling operation, and the bearing 2 can be smoothly disengaged from the shaft 1. Further, the nail attachment 29 attached to the tip of the arm 26 can be adapted to the shape and size of the bearing 2 and can be exchanged to accommodate various types of bearing 2 withdrawal operations. . For example, the claw attachment 39 shown in FIG. 3 is attached to the tip of the arm 26. The claw attachment 39 includes a hooking claw 41 that can be hooked on the shoulder portion 40 of the bearing 2, and an engaging claw 33 having the same configuration as that of the above-described embodiment in a state of facing the hooking claw 41. Become. According to the claw attachment 39, even if there is no snap ring fitting groove on the outer peripheral surface of the bearing 2, the bearing can be separated from the shaft.

In the above embodiment, the screw shaft 21 is used as the pressing body, but the structure of the pressing body is not limited to this, and a cylinder device, a slide hammer or the like may be used. The point is that a mechanism for exerting a pressing force in the axial direction on the shaft may be provided. Further, in the above-described embodiment, the structure is such that the base end portion of the arm 26 is slidably supported along the slit 24 of the support piece 23. It is also possible to adopt a structure in which the base end portion of the arm is pin-coupled to the pin holes provided at intervals.

[0013]

[Effect of device]

 As described above, according to the present invention, it is possible to securely engage the bearing at the tip of the arm, and it is possible to reliably disengage the bearing from the shaft.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a bearing is separated from a shaft by a bearing puller according to an embodiment of the present invention.

2 is an overall perspective view of the bearing puller shown in FIG. 1. FIG.

FIG. 3 is a cross-sectional view showing an engagement state of engagement claws with a bearing.

FIG. 4 is a sectional view showing a state in which a bearing is separated from a shaft by a conventional bearing puller.

[Explanation of symbols]

 1 axis 2 bearing 3 groove for snap ring fitting 4 bearing puller 5 support piece 6 base 7 screw shaft 8 pin hole 9 hooking claw 10 arm 11 pin 12 connecting piece 13 bolt insertion hole 14 bolt 15 center hole 16 sharp edge 20 bearing Puller 21 Screw shaft (pressing body) 22 Base 23 Supporting piece 24 Slit 25 Step 26 Arm 27 Pin hole 28 Pin 29 Claw attachment 30 Bolt 31 Hooking claw 32 Support hole 33 Engaging claw 34 Screw 35 Spacer 36 Nut 37 Ring-shaped hole 38 Inner wall 39 Claw attachment 40 Shoulder 41 Claw

Claims (3)

[Scope of utility model registration request] 1. A base body arranged to face a bearing mounted on the shaft, and a shaft arranged at the center of the base body and movable along the axial direction of the shaft arranged to face the base body. A pressing member that abuts against the shaft portion and exerts a pressing force in the axial direction on the shaft, and at least two or more members are supported on the outer side of the base body, and a groove or a shoulder portion for fitting the snap ring on the outer peripheral surface of the bearing is provided at the tip end portion. An arm having a hooking claw that can be hooked onto the shaft, and a bearing puller that allows the bearing to be detached from the shaft by the hooking claw by the action of a pressing force on the shaft of the pressing body. Is supported by the arm so as to be movable in the radial direction with respect to the shaft, is engaged with the ring-shaped hole in the end face of the bearing, and is abutted and engaged with the inner wall of the bearing outer ring portion in the ring-shaped hole, Bearing puller, characterized in that the outer ring of the bearing together with the latching pawls being arranged with a engaging claw to enable pinching. 2. The base body is provided with a plurality of support pieces extending in a radial direction with respect to the pressing body arranged along the axial direction of the shaft, and the base end portion of each arm is attached to the support piece. The bearing puller according to claim 1, wherein the bearing puller is supported so as to be slidable in a radial direction with respect to the pressing body. 3. The bearing puller according to claim 1, wherein the pressing body is formed by a screw shaft screwed to the base body, arranged along the axial direction of the shaft, and screwed.