JPH05212686A - Hydraulic torque wrench - Google Patents

Abstract

PURPOSE:To highly improve the impact torque by bending a blade and a liner sealing surface at the central part and getting one impact torque in sealing the blade and the liner sealing surface one time alone to one rotation of the liner. CONSTITUTION:A sealing surface 7a is formed in a main shaft 7 on a shaft peripheral surface between two blades 9 being fitted on a line passing through a shaft center line. In addition, this sealing surface 7a is adjusted in a direction crossing with a straight line passing through the shaft center, and further the crossed angle is accorded with the same value as a sealing surface 8a of a liner 8 being crossed with an axis of a liner chamber and bent at the central part. In succession, one stroke is struck by rotation of the liner 8 being rotated by a rotor 4, through which a stable high torque is securable without enhancing the extent of hydraulic pressure in a hydraulic type impact torque generator so much.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to obtain a stable high torque without significantly increasing the hydraulic pressure in the hydraulic striking torque generator by striking the liner rotation with one stroke using two blades. The present invention relates to a hydraulic torque wrench.

[0002]

2. Description of the Related Art In a torque wrench of a pneumatic tool, a striking force is mechanically generated by a rotating force of a rotor and the striking force is utilized to convert the striking force into a desired torque. Therefore, in the method of obtaining the striking torque by this mechanical method, the striking sound is noisy and may cause noise pollution, and the vibration due to the striking may cause the worker to have a kenshin syndrome or a white wax disease. There is.

[0003]

Therefore, in recent years, a torque wrench that uses hydraulic pressure as a method for obtaining a striking torque and that prevents noise and vibration has been promisingly developed.
However, as a hydraulic percussion torque generator, there is one in which a main shaft is provided with one blade, a plurality of such ones are provided with, for example, four blades as disclosed in Japanese Patent Publication No. 41-5800, but in the former case, the main shaft is fitted. In the inserted rotatable liner, that is, the hydraulic pressure of the striking torque generator becomes higher, the sealing method becomes more precise and solid structure, and the blade exerts pressure on only one side in the inner peripheral direction of the main shaft, and the output of the blade depends on the direction of the main shaft. There are drawbacks such as variations in torque and couples such as seizure. In the latter case, at least 2 for each rotation of the liner.
Since the ball is hit twice, the inertia of the rotating mass of the liner and the case is small and the hitting torque is low.

In view of this, the present invention is provided with two blades (blades) on the main shaft in the liner. The blade and the seal surface of the liner are bent at the central portion so that the blade and the liner seal are rotated for one rotation of the liner. It is an object of the present invention to eliminate the above-mentioned drawbacks by sealing the surface only once to obtain one impact torque.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a liner rotated by a rotor is provided with an eyebrow-shaped cavity, and the liner is provided on the inner peripheral surface of the cavity. Of the four sealing surfaces, locate the sealing surface on the longitudinal axis of the inner peripheral surface of the liner on this straight line, and set the other two sealing surfaces close to the minor axis of the inner peripheral surface of the liner to the center of the liner. Two blades that are arranged so that they intersect with the passing minor axis and are bent at the center, are asymmetric with respect to the minor axis, and that are fitted on the spindle passing through the centerline of the spindle. And a sealing surface formed on the outer peripheral surface of the main shaft between the blades, and intersects this sealing surface in a direction intersecting with a straight line passing through the center of the main shaft and at the same value as a sealing surface intersecting with the axis of the liner chamber. Match the angles and at the center And music, is summarized in that when taken to obtain an hit at a single revolution of the liner to be rotated by the rotor.

[0006]

The present invention will be described below with reference to the illustrated embodiments. In the figure, reference numeral 1 is a main body of a hydraulic torque wrench, and a main valve 2 for supplying and stopping high pressure air in the main body 2
And a normal / reverse rotation switching valve 3, and a rotor 4 is provided in the main body 1 so as to generate a rotational torque in the high pressure air sent from this valve group, and has a motor structure of a general pneumatic tool. ing.

A hydraulic striking torque generator 5 for converting the rotational torque of the rotor 4 into a striking torque is provided in a front case 6 projecting from the tip of the main body 1.

In this hydraulic percussion torque generator 5, a liner 8 having an inner diameter eccentric to the main shaft 7 is rotatably fitted to the main shaft 7 in a liner case 12, and the torque is applied to the liner 8. And is sealed with hydraulic oil for generating, and the main shaft 7 is provided with two blade insertion grooves 7b, 7b opposed to each other on the diameter line passing through the center, and the blade 9 is inserted into each groove, and The two blades 9 and 9 are always provided by a spring S so as to project in opposite directions of the outer peripheral direction of the main shaft, and the thickness of these blades is smaller than the groove width. , 9 are formed on the outer peripheral surface of the main shaft between the first and the second main shafts, and sealing surfaces 7a, 7a slightly protruding from the outer end surface of the main shaft are formed. The two sealing surfaces 7a, 7a are provided so as to intersect with an axis a that is orthogonal to the straight line connecting the blade insertion grooves.

The sealing surface 7a is formed on two intersecting axes c and d having an angle β with respect to the axis a as shown in FIG. 3A, and the sealing surface 7a is bent at its central portion. To form a flat V-shape, or, as shown in FIG. 2B, with respect to the axis a, on the axes e and f parallel to the upper and lower sides of the axis a, and at the center portion with the axis g orthogonal to the axis a. The seal surface 7a can be formed into various shapes such as a crank shape by connecting with each other. When the two seal surfaces 7a, 7a are formed on the one main shaft, the seal surfaces 7a, 7a are arranged so as to be asymmetric with respect to the axis a in the development view.

The liner 8 fitted with the main shaft 7 provided with the two blades 9 projecting in the opposite direction forms a liner chamber having a cocoon-shaped cross section as shown in detail in FIG. The inner peripheral surface of the constricted portion is made to protrude in a mountain shape from the inner peripheral surface of the other portion to form a seal surface 8a. The both seal surfaces 8a, 8a intersect the straight line a passing through the center of the liner.

This is the seal surface 7 provided on the main shaft 7 described above.
Same as a. This is shown in FIG. FIG. 4A shows FIG.
Corresponding to (A), the sealing surface 8a also has a flat V-shape like the sealing surface 7a. 3B corresponds to FIG. 3B, and the seal surface 8a has a crank shape.

In this way, the seal surfaces 8a and 7a provided on the liner and the main shaft are formed correspondingly, so that when the liner 8 rotates around the outer periphery of the main shaft 7 inserted into the liner chamber, the seal surface 8a is formed. When the seal surface 7a of the main shaft 7 is brought into contact with or close to the seal surface 7a and the seal surfaces 7a and 8a completely coincide with each other, the seal surfaces 7a and 8a are hermetically sealed so as to divide the chamber into two. Eggplant Then, the liner chamber is brought into contact with the tip of the blade 9 at an intermediate position between both sealing surfaces which are substantially opposed to each other on the inner peripheral surface of the liner 8, and the liner chamber is made into two or four chambers by the two blades 9 and both seals 7a, 8a. A mountain-shaped sealing surface 8b is formed so as to be temporarily divided, and the sealing surfaces 8b and 8b are arranged in a straight line passing through the center of the chamber so that their centers coincide with each other. Further, an output adjusting valve insertion hole 10 is bored in one of the sealing surfaces 8b of the liner 8 in parallel with the liner chamber, that is, in parallel with the axis of the liner, and the mountain-shaped sealing surface 8b is formed in the inner portion of the hole 10. Ports P1 and P2 are formed between at least two chambers that are divided by the seal surface of the main shaft and the blades so that each chamber and the output adjustment valve insertion hole 10 are electrically connected, and the output adjustment valve 11 is provided in the hole. Is adjustably fitted.

Therefore, now the main valve 2 and the switching valve 3
Is operated to introduce pressurized air into the rotor chamber in the main body 1, the rotor 4 rotates at high speed. The turning force of the rotor is transmitted to the liner 8 provided on the rotor shaft. The outer periphery of the liner 8 is rotatably supported by a cylindrical liner case 12, and the liner upper lid 13 is attached to both end surfaces of the case.
A liner lower lid 14 is provided to seal the hydraulic oil filled in the liner chamber. The rotation of the liner 8 changes the cross-sectional shape of the liner chamber as shown in FIGS.

In FIG. 2 (A), a state where a pulse, that is, a striking force is generated on the main shaft, whereby the liner is rotated by 90 degrees, is shown in each of FIGS. 2 (B), 2 (C) and 2 (D). .. 2 (A) at the time of impact, the main shaft sealing surface 7a and the blade 9 are in contact with the sealing surfaces 8a and 8b of the liner 8, respectively.
The liner chamber is divided into two chambers on the left and right with the vanes 9 and 9 facing each other in a straight line, and the left and right chambers are further divided into a high pressure chamber H and a low pressure chamber L by the sealing surfaces 7a and 8a. A high pressure chamber H and a low pressure chamber L are formed on both sides of the blade.
When the liner 8 is further rotated by the rotation of the rotor 4, the volume of the high pressure chamber H out of the two chambers separated by the seal surface 7a of the main shaft 7 and the seal surface 8a on the liner side immediately before the moment of impact. The volume of the low-pressure chamber L is decreased, and when the two chambers sandwiching the blade are completely sealed, a high pressure is generated in the high-pressure chamber, and the hydraulic pressure instantly moves the side surface of the blade 9 to the low-pressure chamber side. Then, the impact force is transmitted to the main shaft in which the blades are fitted, and a desired intermittent torque is generated in the main shaft to rotate the main shaft to perform the desired work.

After the torque is generated on the main shaft by the impact of the blade, the liner is further rotated 90 degrees, as shown in FIG.
As shown in (B), the liner chamber has a main shaft blade and a sealing surface 8
The high pressure and low pressure chambers formed by sandwiching the blade with each other are electrically connected to each other to form one chamber, and the entire liner chamber is divided into two chambers of the same pressure, and no torque is generated in the main shaft. Is further rotated by the rotation of the rotor.

In this way, when the liner is further rotated 90 degrees, that is, 180 degrees from the time of striking, it becomes as shown in FIG. 2 (C). In this state, the seal surfaces 8b, 8b of the liner and the seal surfaces 7a, 7a of the main shaft, which face each other, intersect with the axis a through which the center passes, so that a gap is generated between the seal surfaces 7a, 8a. The chamber is divided into two chambers on the left and right by the main shaft and the upper and lower blades 9, 9, which is substantially the same as when rotating 90 degrees from the time of striking in Fig. 2 (b), and pressure changes throughout the liner chamber. The liner rotates freely because there is no pressure and the pressure is the same.

Further, the state in which the liner rotates 90 degrees and rotates 270 degrees from the time of striking is substantially the same as the state in which the liner rotates 90 degrees, and the output adjusting valve position is merely upside down. When the liner is further rotated from the state of FIG. 2D, the liner chamber is divided into two chambers on the left and right with the blade sandwiched between the blade and the seal surface 8 on the liner side.
b and the main shaft and liner side sealing surfaces 7a and 8a contact each other, the liner chamber becomes four chambers, that is, two high pressure chambers and two low pressure chambers. The striking force is generated as described above. In this way, one powerful striking is performed by one rotation of this liner.
It is something that can occur. The adjustment of the striking force is carried out by the output adjusting valve 11, which is carried out in the same manner as in the conventional case, and the detailed description thereof will be omitted.

[0018]

According to the present invention, at least four sealing surfaces are formed on the inner peripheral surface of the liner, which has a main shaft fitted therein and is rotatable by the rotor of the liner itself, In addition, the two opposing sealing surfaces are bent at the center and intersect with the straight line passing through the center of the liner chamber. Also, in the direction intersecting with the straight line passing through the center of the spindle between the two blades and the outer peripheral surface between the blades. Moreover, since the sealing surface is provided by bending the same in the same direction as the sealing surface of the liner and at the central portion, one stroke can be strongly generated for one rotation of the liner. The parts of both the main shaft and liner are approximately symmetrical, so good balance is achieved, and the internal pressure rise of the liner chamber acts as a couple due to the two blades, resulting in good efficiency and strong striking force. In the case of, the rotational force works on only one side in the inner peripheral direction of the shaft, so there was a loss of rotational force due to the bearing acting on one side, but this point is also advantageous, and because of the two blades, sealing performance Has a number of advantages such as good internal pressure and high efficiency of increasing the internal pressure.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a hydraulic torque wrench of the present invention.

FIG. 2 is a cross-sectional view of a liner portion, showing (A) and (B).
(C) and (D) are explanatory views showing the state of occurrence of impact.

FIG. 3 is a development view of a spindle.

FIG. 4 is a development view of a liner.

[Explanation of symbols]

 1 main body, 2 main valve 3 forward / reverse rotation switching valve 4 rotor 5 hydraulic chamber striking torque generator 7 main shaft 7a, 8a, 8b sealing surface 8 liner 9 blades 10 output adjusting valve insertion hole P1, P2 port H, L liner chamber 11 Output adjustment valve 12 Liner case 13 Liner upper lid 14 Liner lower lid

Claims (1)

[Claims] 1. A liner rotated by a rotor is formed with an eyebrow-shaped cavity, and among four sealing surfaces provided on the inner peripheral surface of the cavity, a seal on the longitudinal axis of the inner peripheral surface of the liner. Position the surfaces on this straight line so that the other two sealing surfaces close to the minor axis of the inner peripheral surface of the liner intersect with the minor axis passing through the center of the liner and bend at the center. It is provided with two blades that are arranged and are asymmetric with respect to the minor axis and that are fitted and inserted into the main shaft along a line passing through the center line of the main shaft, and a sealing surface formed on the outer peripheral surface of the main shaft between the blades. And, the seal surface is bent in the center in a direction intersecting with the straight line passing through the center of the main axis, and at the same angle as the seal surface intersecting with the axis of the liner chamber, and is rotated by the rotor. You get one blow with one revolution of the liner A hydraulic torque wrench that has grown up.