JP2012161852A - Oil pulse generator, and oil pulse rotary tool with oil pulse generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pulse generator in which an adjusting member can be prevented from dropping off without mounting a separate member other than the adjusting member to the oil pulse generator from outside, and to provide an oil pulse rotary tool with the oil pulse generator.SOLUTION: In the oil pulse generator 50, a pressure chamber 52A which is filled with operating oil is provided in a cylindrical case 51 rotationally driven by a motor, and a spindle 53 is provided coaxially with the case to project toward the front side of the case. The oil pulse generator 50 includes a torque adjuster 60 capable of adjusting magnitude of impact torque hydraulically generated and applied to the spindle. The torque adjuster includes a communication path 61 formed in the spindle to communicate an inside of the spindle with a pressure chamber, and to allow the operating oil to move, and an adjusting member 62 provided to advance and retreat in the communication path, and to vary a communication condition between the inside of the spindle and the pressure chamber with positioning operation in the communication path. A drop off preventing part 63 is integrally formed on an inner face of the communication path to restrict the adjusting member to move in a drop off direction.

Description

  The present invention is provided with a torque adjusting means capable of adjusting the magnitude of the impact torque by adding an impact torque generated by hydraulic pressure to a spindle that is coaxially projected from a cylindrical case filled with hydraulic oil. The present invention relates to an oil pulse generator and an oil pulse rotating tool including the oil pulse generator.

  For example, Patent Document 1 discloses an oil pulse generator in which an adjustment member that adjusts the magnitude of impact torque is disposed in an oil passage provided in a liner. In the oil pulse generator of Patent Document 1, a male screw is formed on the adjustment member, a female screw is formed on the oil passage, the male screw and the female screw are screwed together, the adjustment member is rotated and moved to increase or decrease the volume of oil circulation, The oil pressure in the oil pulse generator is adjusted.

  Further, in Patent Document 2, as a structure for preventing the drop of a bolt fastened between two parts, a bolt holding member in which a through hole is formed is held by a support ring with respect to a hole formed in one part, It is disclosed that after inserting a bolt having a male screw formed in a front end portion into the through hole, the male screw is screwed into a female screw hole formed in the other part.

JP 2010-269427 A JP 58-170913 A

  Generally, in an oil pulse generator, a retaining pin that extends in a direction orthogonal to the axial direction of the adjusting member is used to prevent an adjusting member used to adjust the magnitude of impact torque from accidentally coming out of the oil flow path. Projecting into the oil flow path on the front side of the liner. For this reason, after preparing a member separate from the adjustment member such as a retaining pin, drilling the separate member into the liner and projecting the separate member into the oil flow path from the outside of the liner. There was a trouble of having to arrange so that.

  The present invention has been proposed in view of such a situation, and is capable of generating an oil pulse that can prevent the adjusting member from coming off without attaching a member separate from the adjusting member from the outside to the oil pulse generator. And an oil pulse rotating tool including the oil pulse generator.

  The oil pulse generator according to the invention of claim 1 is provided with a pressure chamber filled with hydraulic oil in a cylindrical case that is rotationally driven by a motor, and a spindle coaxial with the case is provided in front of the case. In the oil pulse generator provided with a torque adjusting means that is protruded and can be adjusted by a hydraulic pressure and applied to the spindle, the torque adjusting means is formed in the spindle, A communication path that allows the hydraulic oil to move by communicating the inside of the spindle and the pressure chamber, and is provided so as to be able to move forward and backward in the communication path. And an adjustment member that changes the communication state with the chamber, and a retaining portion that restricts movement of the adjustment member in the removal direction is integrally formed on the inner surface of the communication path. To.

  According to a second aspect of the present invention, in the first aspect, the adjustment member has a male screw portion that is screwed into a first female screw portion formed on the inner surface of the communication path, and is moved by screw feeding by a rotation operation. As a shaft body, the retaining portion is formed on the inner surface of the communication path with a space in which the male screw portion can be fitted between the first female screw portion, and the male screw portion is screwed together A possible second female thread portion is provided.

  An oil pulse rotary tool according to a third aspect of the invention is a cylindrical case which is provided with a pressure chamber filled with hydraulic oil and is driven to rotate by a motor, and a torque capable of adjusting the magnitude of impact torque generated by hydraulic pressure. An oil pulse generator having adjusting means is housed in a housing, and a spindle projecting coaxially with the case in front of the case is rotatably supported by the housing, and the spindle In the oil pulse rotating tool for applying impact torque, the oil pulse generator according to claim 1 or 2 is housed in the housing.

According to the oil pulse generator of the first aspect of the invention and the oil pulse rotating tool of the third aspect of the invention, the adjustment member is moved back and forth in the communication path in order to change the communication state between the spindle and the pressure chamber. When this is done, the retaining portion formed integrally with the inner surface of the communication path can restrict the movement of the adjusting member in the direction of removal. Therefore, the adjustment member can be prevented from being detached from the oil pulse generator without attaching a member separate from the adjustment member such as a retaining pin from the outside to the oil pulse generator.
According to the second aspect of the present invention, the second threaded portion of the adjusting member is screwed into the second threaded portion in the communication path, and then the adjusting member is screwed and moved by a rotation operation. An internal thread part can be passed. Therefore, even if the retaining portion (second female screw portion) is provided, there is no trouble in attaching and detaching the adjusting member to the communication path.
Furthermore, when the male screw portion passes between the second female screw portion and fits between the first female screw portion and the second female screw portion that hits the retaining portion, the male screw portion turns idle. The adjustment member is restricted from moving in the removal direction by being caught by the second female screw portion. Thereby, the adjustment member can be prevented from coming off from the communication path.

It is a principal part longitudinal cross-sectional view of the oil pulse driver provided with the oil pulse unit of embodiment of this invention. It is a principal part longitudinal cross-sectional view of the oil pulse unit before inserting an adjustment member in a communicating path. It is a principal part longitudinal cross-sectional view of the oil pulse unit which showed the state by which the movement of the external thread part of an adjustment member is controlled by the 2nd internal thread part. It is a principal part longitudinal cross-sectional view of the oil pulse unit which the adjustment member made the hydraulic-oil supply path into the fully-closed state.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the oil pulse driver 1 includes a main body housing 10 and a unit case 20. The main body housing 10 is formed by assembling left and right half housings made of resin, and has a body portion 11 and a handle portion 12. The body portion 11 is formed in a cylindrical shape and extends in the front-rear direction of the oil pulse driver 1 (left-right direction in FIG. 1). A motor 30 and a planetary gear reduction mechanism 40 are accommodated in the body portion 11. The motor 30 is connected to the planetary gear reduction mechanism 40. The main body housing 10 and the unit case 20 are examples of the housing of the present invention.

  The handle portion 12 is continuously provided from the body portion 11 so as to be substantially T-shaped in a side view of the oil pulse driver 1. A switch 14 having a trigger 13 is accommodated in the handle portion 12. When the trigger 13 is pulled, the motor 30 is driven by being supplied with electric power. Further, the unit case 20 is assembled in front of the body portion 11 (on the right side in FIG. 1). An oil pulse unit 50 is accommodated in the unit case 20. The oil pulse unit 50 is connected to the planetary gear reduction mechanism 40. The oil pulse unit 50 is an example of the oil pulse generator of the present invention.

  As shown in FIGS. 1 and 2, the oil pulse unit 50 includes a case 51, a liner 52, a spindle 53, and torque adjusting means 60. The case 51 has a cylindrical shape with both ends closed by caps, and a cylindrical liner 52 is fixed inside the case 51. A pressure chamber 52A filled with hydraulic oil is provided in the liner 52, and the spindle 53 is rotatably supported. The front end of the spindle 53 projects coaxially with the case 51 to the front of the case 51. This front end is rotatably supported by a ball bearing 21. In the front end surface of the spindle 53, an insertion port into the bit insertion portion 54 that extends in the front-rear direction of the spindle 53 in the spindle 53 opens. At the front end of the spindle 53, an operation cylinder 55 is externally mounted so as to be able to advance and retreat, and the ball 56 is pushed into the bit insertion portion 54 by the operation cylinder 55. With this ball 56, the bit inserted into the bit insertion portion 54 is fixed to the spindle 53.

  When the screw tightening operation is performed by the oil pulse driver 1, when the motor 30 is rotated by pulling the trigger 13, the rotational force decelerated through the planetary gear reduction mechanism 40 is transmitted to the oil pulse unit 50. The oil pulse unit 50 is rotationally driven. As a result, the bit attached to the spindle 53 can be rotated to tighten the screw. When the load on the spindle 53 increases with the tightening operation of the screw and the rotation of the spindle 53 is delayed from the rotation of the oil pulse unit 50, the oil pulse unit 50 generates an impact torque by hydraulic pressure. Since this impact torque is intermittently applied to the spindle 53, it is possible to retighten the screws. The oil pulse unit 50 is an example of the oil pulse generator of the present invention, and the oil pulse driver 1 is an example of the oil pulse rotating tool of the present invention.

  The torque adjusting means 60 includes a communication path 61, an adjusting member 62, and a second female screw portion 63 as a retaining portion. The communication path 61 communicates with the pressure chamber 52 </ b> A via the hydraulic oil supply path 57 on the rear end side of the spindle 53. The communication path 61 is formed in the spindle 53 so as to extend in the front-rear direction until reaching the bit insertion portion 54. As shown in FIG. 2, a first female thread portion 61 </ b> A is formed on the inner surface of the rear end portion of the communication path 61.

  The adjustment member 62 is a shaft body in which a male screw portion 62A is provided on the outer surface on one end side. A rotation groove 62 </ b> C is formed in the head portion 62 </ b> B of the shaft body that contacts the other end side of the adjustment member 62. The rotation groove 62C is used for inserting the tip of the driver to rotate the adjustment member 62. Further, O-rings 62D and 62E are externally mounted on the shaft body at a position on the head 62B side. The adjustment member 62 is inserted into the communication path 61 in a state in which the adjustment member 62 can advance and retreat and can rotate while maintaining a sealed state by the O-rings 62D and 62E.

  The second female screw portion 63 is formed on the inner peripheral surface of the communication path 61 and is provided on the front end side of the spindle 53 with respect to the first female screw portion 61A. Between the first female screw portion 61A and the second female screw portion 63, an interval (a fitting space 64) is provided in which the male screw portion 62A of the adjustment member 62 can be fitted. The fitting space 64 hits the large diameter portion of the communication path 61.

  Next, an operation for fitting the adjustment member 62 into the communication path 61 will be described. First, the adjustment member 62 is sequentially inserted from the insertion port into the bit insertion portion 54 into the bit insertion portion 54 and the communication path 61 in the spindle 53, so that the male screw portion 62A reaches the second female screw portion 63. . Subsequently, the male screw portion 62A is screwed and moved by rotating the adjustment member 62 by inserting the tip of the driver into the rotation groove 62C while screwing the male screw portion 62A into the second female screw portion 63, thereby causing the male screw portion 62A to move. The adjustment member 62 is moved forward in the communication path 61 toward the rear end side of the spindle 53 until the second internal thread portion 63 passes. As a result, as shown in FIG. 3, the male screw portion 62A is fitted in the fitting space 64, and the adjustment member 62 is idle. Once the male screw portion 62A passes through the second female screw portion 63, the male screw portion 62A is caught by the second female screw portion 63, so that the adjustment member 62 is restricted from moving to the front end side of the spindle 53 in the communication path 61. Is done. For this reason, the adjustment member 62 does not come out of the communication path 61. The direction of the front end side of the spindle 53 in the communication path 61 is an example of the direction in which the adjusting member of the present invention is pulled out.

  Thereafter, the adjusting member 62 is slid in the communication passage 61 toward the rear end side of the spindle 53, and the male screw portion 62A reaches the first female screw portion 61A. Subsequently, the adjustment member 62 is rotated by a driver while the male screw portion 62A is screwed to the first female screw portion 61A, and the hydraulic oil supply passage 57 is fully closed as shown in FIG. Screw feed movement is possible.

  Next, an operation for adjusting the pressure in the pressure chamber 52A in order to adjust the magnitude of the impact torque will be described. The adjustment member 62 is positioned by adjusting the screw feed amount to the front end side of the spindle 53 by performing a rotation operation by the driver in the communication passage 61 to change the opening amount of the hydraulic oil supply passage 57. Accordingly, the communication state between the pressure chamber 52A and the spindle 53 (communication path 61) can be changed. The operation when the adjustment member 62 fully opens the hydraulic oil supply passage 57 will be described below.

  By rotating the male threaded portion 62A of the adjusting member 62 in the direction to open the hydraulic oil supply passage 57, the adjusting member 62 moves forward by screw and moves backward to the front end side of the spindle 53 as shown in FIG. The hydraulic oil supply passage 57 is fully opened. As a result, the hydraulic oil moves from the pressure chamber 52A into the communication passage 61 through the hydraulic oil supply passage 57, and as a result, the pressure in the pressure chamber 52A decreases. In the state shown in FIG. 3, the male screw portion 62 </ b> A is idled in the fitting space 64 (see FIGS. 2 and 4) and is hooked on the second female screw portion 63. The operator can know the limit position of the opening operation of the hydraulic oil supply passage 57. On the other hand, as shown in FIG. 4, when the hydraulic oil supply passage 57 is fully closed, the hydraulic oil is completely filled in the pressure chamber 52A, and the pressure in the pressure chamber 52A increases.

<Effect of this embodiment>
In the impact driver 1 and the oil pulse unit 50 provided in the impact driver 1 of the present embodiment, the adjustment member 62 is moved forward or backward in the communication path 61 in order to change the communication state between the spindle 53 and the pressure chamber 52A. Sometimes, the second female screw portion 63 can restrict the adjustment member 62 from moving to the front end side of the spindle 53 in the communication path 61. Therefore, the adjustment member 62 can be prevented from coming off from the oil pulse unit 50 without attaching a member separate from the adjustment member 62 such as a retaining pin to the oil pulse unit 50 from the outside.

Further, after the male screw portion 62A is screwed into the second female screw portion 63 in the communication path 61, the adjusting member 62 is moved by screw feed by rotating operation, thereby passing through the second female screw portion 63. Can be made. Therefore, even if the second female screw portion 63 that prevents the adjustment member 62 from coming off is provided, there is no problem in the attachment / detachment of the adjustment member 62 with respect to the communication path 61.
Further, when the male screw portion 62A passes through the second female screw portion 63 and fits into the fitting space 64, the male screw portion 62A rotates idly and is caught by the second female screw portion 63, thereby adjusting member 62. Is restricted from moving to the front end side of the spindle 53. Thereby, the adjustment member 62 can be prevented from coming off from the communication path 61.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. In the above-described embodiment, the retaining portion of the adjustment member 62 is configured by the second female screw portion 63 formed on the inner peripheral surface of the communication path 61. However, the present invention is not limited thereto, and for example, the retaining portion is the communication path 61. It may be configured by a ring-shaped protrusion integrally formed on the inner peripheral surface of the inner surface of the adjusting member 62 so as to restrict the head 62B of the adjusting member 62 from moving to the front end side of the spindle 53 in the communication path 61. . Moreover, although the example which applied this invention to the oil pulse driver 1 was shown in embodiment mentioned above, you may provide this invention to an oil pulse wrench.

  DESCRIPTION OF SYMBOLS 1 ... Oil pulse driver 10 ... Main body housing 20 ... Unit case 30 ... Motor 50 ... Oil pulse unit 51 ... Case 52A ... Pressure chamber 53 ... Spindle 60 ... Torque adjusting means, 61... Communication path, 61 A... First female screw portion, 62... Adjustment member, 62 A... Male screw portion, 63.

Claims (3)

A pressure chamber filled with hydraulic oil is provided in a cylindrical case that is rotationally driven by a motor, and a spindle is projected in front of the case coaxially with the case. In the oil pulse generator provided with torque adjusting means capable of adjusting the magnitude of the applied impact torque,
The torque adjusting means includes
A communication path formed in the spindle and allowing the hydraulic oil to move by communicating the inside of the spindle and the pressure chamber;
An adjustment member provided so as to be capable of moving back and forth in the communication path, and changing a communication state between the spindle and the pressure chamber by a positioning operation in the communication path;
An oil pulse generator characterized in that a retaining portion for restricting the movement of the adjusting member in the removal direction is integrally formed on an inner surface of the communication path. The adjusting member has a male screw portion that is screwed into a first female screw portion formed on the inner surface of the communication path, and as a shaft body that moves by screw operation by rotating operation,
The retaining portion is formed on the inner surface of the communication path with a space in which the male screw portion can be fitted between the first female screw portion, and the male screw portion can be screwed second. The oil pulse generator according to claim 1, wherein the oil pulse generator is a female screw portion. An oil pulse generator having a cylindrical case that is provided with a pressure chamber filled with hydraulic oil and is driven to rotate by a motor, and torque adjusting means that can adjust the magnitude of impact torque generated by hydraulic pressure, is provided in the housing. In the oil pulse rotary tool that accommodates and projects the spindle coaxially with the case in front of the case so as to be rotatably supported by the housing and apply the impact torque to the spindle.
An oil pulse rotating tool characterized in that the oil pulse generator according to claim 1 or 2 is accommodated in the housing.

Images