JPH0529681U - Hydraulic torque wrench - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size and weight of the rotation transmission mechanism that incorporates a pinion gear and a ratchet gear in a hydraulic torque wrench. [Structure] The pinion gear 4 is formed in an annular shape, and teeth 4a that mesh with the rack 3 are provided only on a part of the outer circumference thereof, and the ratchet pawl 6 is embedded in a toothless portion 4b of the pinion gear 4, and the tip thereof is the pinion gear. The ratchet gear 5 is fitted inside the pinion gear 4 so as to be relatively rotatable, and is engaged with the ratchet pawl 6. Since the pinion gear 4, the ratchet gear 5, and the ratchet pawl 6 are incorporated in the radial direction, the axial dimension is reduced, and the ratchet pawl 6 is embedded in the toothless portion 4b of the pinion gear 4. Radial expansion is suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a hydraulic torque wrench used for tightening and removing bolts and nuts.

[0002]

[Prior Art]

 A hydraulic torque wrench is known in which the forward / backward movement of a piston rod is converted into a forward / reverse rotational movement by a rack and pinion, and this is converted into a unidirectional rotational movement by a ratchet mechanism to obtain the rotational force of a bolt / nut. .. In the conventional hydraulic torque wrench, since the pinion gear and the ratchet gear are provided so as to overlap each other in the axial direction, there is a problem that the rotation transmission mechanism portion becomes large.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to reduce the size and weight of a rotation transmission mechanism unit incorporating a pinion gear and a ratchet gear.

[0004]

[Means for Solving the Problems]

 In the present invention, in order to solve the above problems, the pinion gear 4 is formed in an annular shape, and teeth 4a that mesh with the rack 3 are provided only on a part of the outer periphery thereof, and the ratchet pawl 6 is a toothless part of the pinion gear 4. 4b so that the tip of the ratchet gear 5 is projected and retracted on the inner peripheral side of the pinion gear 4, the ratchet gear 5 is relatively rotatably fitted inside the pinion gear 4, and is engaged with the ratchet pawl 6 to engage the hydraulic torque wrench. Configured

[0005]

[Action]

 In the hydraulic torque wrench of the present invention, since the pinion gear 4, the ratchet gear 5, and the ratchet pawl 6 are incorporated in the radial direction, the axial dimension is reduced. Further, since the teeth 4a are not provided on the entire circumference of the pinion gear 4 and the ratchet pawl 6 is embedded in the toothless portion 4b, expansion in the radial direction is suppressed.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. 1 is a sectional view of a hydraulic torque wrench, and FIG. 2 is a sectional view taken along line II-II in FIG.

The main body 1 of the hydraulic torque wrench is composed of a cylinder 2 connected to a hydraulic power source, a rack 7, a pinion gear 4, a ratchet gear 5, and a casing 7 holding a ratchet pawl 6. The cylinder 2 is connected to a hydraulic pressure source. A piston rod 8 is inserted in the cylinder 2 so as to be able to move forward and backward. The rack 3 is connected to the piston rod 8. A limit switch LSW is provided on the tip side of the rack 3 in the casing 7. A pinion gear 4 is rotatably provided on a side portion of the rack 3 so as to mesh with the rack 3. The pinion gear 4 is formed in an annular shape and is provided with teeth 4a that mesh with the rack 3 only within a range of about 180 ° on the outer circumference thereof. The toothless portion 4b of the pinion gear 4 is made thick, and a recess 4c for accommodating the ratchet pawl 6 is radially provided in a portion thereof. The ratchet pawl 6 is inserted into the recess 4c of the pinion gear 4 via the spring 10, and the tip of the ratchet pawl 6 can be retracted to the inner peripheral side of the pinion gear 4. The ratchet gear 5 is relatively rotatably fitted inside the pinion gear 4 and is engaged with the ratchet pawl 6. A square shaft 11 is coupled to the center of the ratchet gear 5, and the square shaft 11 projects from the casing 7. A socket 12 for hanging a bolt or a nut can be mounted on the square shaft 11.

In this hydraulic torque wrench, however, when oil is sent into the cylinder 2, the piston rod 8 and the rack 3 move to the right while compressing the spring 9, and the pinion gear 4 meshing with the piston rod 8 and the rack 3 moves. The ratchet gear 5 rotates about 180 ° clockwise and further meshes with the ratchet pawl 6 and rotates together with the angular shaft 11 about 180 ° clockwise. By this rotation, the bolt and nut are rotated. When the pinion gear 4 rotates about 180 °, the rack 3 pushes the limit switch LSW to operate it, and the signal causes the solenoid valve in the hydraulic circuit (not shown) to open for a predetermined time to release the oil in the cylinder 2 and release the spring. The piston rod 8 is returned to the left by the restoring force of 9. At this time, the ratchet gear 5 relatively idles, and the rotation of the pinion gear 4 is not transmitted. Repeat this operation to rotate the bolt and nut a required number of times.

[0009]

[Effect of the device]

 As described above, in the present invention, the pinion gear 4 is formed in an annular shape, and the teeth 4a that mesh with the rack 3 are provided only on a part of the outer periphery thereof, and the ratchet pawl 6 is provided on the toothless portion 4b of the pinion gear 4. Since the tip of the ratchet gear 5 is embedded in the pinion gear 4, the ratchet gear 5 is relatively rotatably fitted inside the pinion gear 4 and engaged with the ratchet pawl 6 to form a hydraulic torque wrench. , The pinion gear 4, the ratchet gear 5, and the ratchet pawl 6 are incorporated in the radial direction to reduce the axial dimension, and the ratchet pawl 6 is embedded in the toothless portion 4b of the pinion gear 4. In addition, the expansion in the radial direction is suppressed, and the overall size and weight of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a hydraulic torque wrench.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 1 Main Body 2 Cylinder 3 Rack 4 Pinion Gear 4a Teeth 4b Toothless Part 4c Recess 5 Ratchet Gear 6 Ratchet Claw 7 Casing 8 Piston Rod 9 Spring 10 Spring 11 Square Shaft 12 Socket

Front page continued (72) Inventor Masaru Aoki 6-5-19 Minami-Shinagawa, Shinagawa-ku, Tokyo Sanwa Tetsuki Co., Ltd. (72) Inventor Kiyoto Ibuka 1-1-1, Watanabe-dori, Chuo-ku, Fukuoka-shi, Fukuoka Sanwa Tetsuki Co., Ltd. Fukuoka Sales Office

Claims (1)

[Scope of utility model registration request] 1. A cylinder connected to a hydraulic pressure source, a piston rod inserted into the cylinder so as to move back and forth, a rack connected to the piston rod, and a pinion gear rotatably provided so as to mesh with the rack. , A ratchet gear rotatably provided relative to the pinion gear, an angular shaft coupled to the center of the ratchet gear, and a ratchet pawl for transmitting only one-direction rotation of the pinion gear to the ratchet gear Wherein the pinion gear is formed in an annular shape and has teeth that mesh with the rack only on a part of the outer periphery thereof, and the ratchet pawl has a tip on a toothless part of the pinion gear. The ratchet gear is embedded in the pinion gear so that the ratchet gear is relatively retracted inside the pinion gear. A hydraulic torque wrench, which is rotatably fitted and engaged with the ratchet pawl.