JPS60201881A - Regulator for striking torque of hydraulic type torque wrench - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impact torque adjusting device for a hydraulic torque wrench, and by providing an adjustment valve inside the liner lower cover, it is possible to simplify the assembly of the liner and the liner lower cover, and improve accuracy. The purpose is to make it a cylindrical device.

Conventionally, a hydraulic torque wrench uses an air motor that rotates under turbid pressure to drive a hydraulic impact torque generator to generate a desired impact torque around the main shaft. In addition, a regulating valve insertion hole parallel to the axis of the liner is drilled, a ball valve and a screw rond for pressing the ball valve are inserted into this hole, and this threaded rond is made to project outward from the lower lid of the liner. ing.

Therefore, in a device that is assembled with high precision, it is extremely difficult to fit the axis of the liner and the lower lid of the liner into the tip, and the adjustment also requires a considerable amount of effort. In particular, the technique for drilling the regulating valve insertion hole concentrically in the liner and the liner lower cover is required to be extremely sophisticated.

The present invention has focused on this point and has been made in an attempt to eliminate the above-mentioned drawbacks by incorporating a vA valve only in the lower lid of the liner, without processing the liner.

The present invention will be explained below based on illustrated embodiments.

1 is the main body of the hydraulic torque wrench, and inside this main body there is a main valve 2 for supplying and stopping high-pressure air, and a forward/reverse rotation switching valve 8, as well as high-pressure air supplied from this valve group. A rotor 4 is provided within the main body 1 to generate rotational torque, and has a motor structure of a general pneumatic tool.

A hydraulic shock torque generating shaft [6] that converts the rotational torque of the rotor 4 into a 9# unit torque is provided in a front case 6 protruding from the tip of the main body 1.

This hydraulic impact torque generator 5 is equipped with a liner case 17.
A liner 8 whose inner diameter is eccentric with respect to the main shaft 7 is provided rotatably with respect to the main shaft 7, and hydraulic oil for generating torque is optically filled and sealed inside the liner 8, and the liner 8 is centered on the main shaft 7. A blade insertion groove 71) is provided on the diameter gauze or on a straight line close to it, and a blade 9 is provided in this groove so as to always protrude toward the outer circumferential direction of the main shaft by means of a spring S, and whose thickness is smaller than the width S. In addition, a sealing surface 7a is formed on the outer circumferential surface of the main shaft on the opposite side of the blade 9, and projects slightly from the outer end surface of the main shaft, and this sealing surface is perpendicular to the straight line connecting the sealing surface and the blade insertion groove. It is provided so as to be slightly offset from the axis IB+a.

In addition, the liner 8 that connects the main shaft 7 with the blades 9 protruding from the main shaft in the direction of its outer chest is shown in detail in FIG. are formed in this liner chamber, facing each other on the inside of the liner chamber passing through its center, and protruding in a mountain shape from the inner circumferential surface of the other part to form a sealing surface 8a. When the liner 8 rotates around the outer periphery of the main shaft 7 inserted into the inner chamber, it comes into contact with or comes close to the sealing surface 7a of the main shaft 7, so that both sides are sealed.

This is fJJ, Figure 2 (N or (B)). As shown, one sealing enclosure 8a is in contact with the sealing surface 7a of the main shaft, - the other sealing surface 8a is in contact with the tip of the vane 9, and the liner chamber is in contact with the tip of the vane 9. This is because the liner 8 rotates so as to be temporarily divided into two chambers by the blades 9 and the sealing surface 7a.

Additionally, upper*hoaTF lids 14 are provided at both ends of the liner 8.

The liner upper cover 1B is fitted with the rotor 4 so as to rotate together with the rotation of the rotor 4, and also rotatably supports one end of the main shaft 7. Liner T
[For tl+, as shown in each figure in FIG. A hole is drilled from one outer circumferential surface of F, and has the required depth to reach partway through the hole without penetrating, and the diameter of the probe hole is made smaller than approximately the middle of the hole. A step 50a is provided at the bottom of the output adjustment hole 10.The adjustment valve insertion hole 11 is opened at the bottom of the output adjustment hole 10, opening toward the liner chamber side and toward the outside, respectively, and communicating with this hole 10.This adjustment valve insertion hole The hole 11 has a small-diameter opening hole 11a on the liner chamber side and a large-diameter opening hole 11b on the outer side, and the regulating valve 15 is inserted into this hole 11 from the outer surface of the lower lid of the liner.Also, the output regulating hole 1o - A hole 12 is bored on the opposite side of the valve adjustment insertion hole 11 so as to be perpendicular to the hole 1o, but this hole 12 opens only to the liner chamber side, and the circular hole 10.12
has been sent 4 times. These two holes 11 and 12 are positioned on both sides of one sealing surface 8a when the liner lower cover is fixed on the liner 8. Further, a ball valve 16 is inserted into the large diameter hole of the output adjustment hole 10, and the ball valve can be moved freely within the hole 10 so as to close the output adjustment hole 10 when the ball valve comes into contact with a step. The opening on the outer circumferential surface of the liner lower lid of the exit adjustment hole 1° is closed. This may be fitted with a plug, or a liner case 17 that is fitted onto the outer periphery of the liner 8 and integrates the liner and the upper and lower lids of the liner.
Alternatively, the votes may be counted. A screw hole 17a is formed on the output side of the liner case 17, that is, on the lower lid side of the liner, and the screw group 15a of the regulating valve 16 is inserted into the screw hole 17a.
Screw them together. As shown in detail in FIG. 4, the regulating valve 15 has a threaded portion 16a protruding from one end, an O-link fitting groove 15b on the outer periphery of the main body, and an O-ring (or gasket) that fits into this hole. 16c, when this cooking valve 16 is inserted into the large diameter part of the adjustment valve insertion hole 11, this valve is made to rotate airtightly, and the tip of the threaded part 15a is inserted with a screwdriver. The screwdriver insertion hole 16 (l)
is engraved, and when the adjustment valve 15 is rotated and screwed in at the threaded part, the output adjustment hole 10 is blocked by the adjustment valve 15, and when the valve is loosened from this state, the output will be adjusted according to the amount of loosening. The operating oil flow rate is adjusted by changing the opening area of the definition hole.

Therefore, if the main valve 2 and the switching valve 8 are operated to introduce pressurized air into the rotor chamber in the main body 1, the rotor 4 will rotate at high speed. This rotational force of the rotor is transmitted to a liner 8 provided on the rotor shaft. This liner 8 is rotatably supported on its outer periphery by a cylindrical shiner case 17, and a liner upper cover 18 and a liner cover 18 are provided at both ends of the case.
A lid 14 is provided to seal the hydraulic oil filling the liner chamber.

This rotation of the liner 8 causes the i! The shape of the T surface changes sequentially, and a pulse or impact force is generated on the main axis. During this g# attack, the sealing direction 7a of the main shaft and the blade 9 are in contact with the two sealing surfaces 8a of the liner 8, and the liner chamber is left and right l# with the blade 9 and the sealing surface 7a directly facing each other in between.
r＠It is divided into two different horizontal units, and during forward rotation, one of the chambers (
In FIG. 2A, the right ventricle) becomes a high-pressure chamber, the opposite side becomes a low-pressure chamber, and the opposite side becomes a low-pressure chamber, forming a high-pressure chamber H and a low-pressure chamber on both sides of the blade. When the liner 8 is further rotated by the rotation of the rotor 4, immediately before the impact VR111j, the high pressure chamber H of the two units separated by the sealing direction 7a of the main shaft 7 and the sealing direction 8a of the liner side is The volume is reduced, the volume of the low pressure chamber increases, and when the two units holding the blades are completely sealed, high pressure is generated in the high pressure chamber,
This hydraulic pressure momentarily pressurizes the side of the blade 9 toward the pressure expansion chamber, transmits the impact force to the main shaft into which the blade is inserted, and generates the desired intermittent torque on the main shaft to rotate the main drive. Then, perform the desired cropping. After generating torque on the main shaft due to the impact of the blades, when the liner further rotates, the liner chamber is formed by sandwiching the blade between the blades of the main shaft and the seal direction 7a, and the high pressure and low pressure chambers are mutually connected. conduction,
− chamber, and the entire liner chamber is divided into two units with the same pressure.
No torque is generated on the main shaft, and the liner rotates further due to rotation of the rotor.

In this way, the liner is further rotated 860 degrees (
(b) When it rotates, the next impact is performed.

In this way, the main shaft is rotated intermittently to perform desired tightening and other operations, and the impact force generated at this time is controlled by the regulating valve 16. By tightening the regulating valve 15 and reducing or completely closing the opening area of the hole 10, the pressure in the high pressure chamber of the liner chamber will increase to the next side according to the opening area, and the force will increase, reaching the maximum set pressure when the liner is fully open. .

On the other hand, loosen the adjustment valve and widen the opening area of hole 1O (then even if one chamber becomes high pressure mH due to pressure increase in the liner chamber, it will be a lower pressure chamber than this hole 1O, however, Because of the escape, the pressure difference between the two chambers does not become too large, so the impact force is weak.

An impact force corresponding to the amount of tightening of this regulating valve can be obtained.

During reverse rotation, no matter where the adjustment valve is located, the oil in the liner chamber will flow from hole 12 through hole 10.11 to the liner chamber on the opposite side, as shown in Figure 2B. The hole 10 is pressed against the step lea of the hole 10, and the hole 10 is completely closed.

Therefore, the high pressure chamber of the liner chamber reaches the set maximum pressure, and a large impact force is generated on the main shaft.

According to the present invention, the valve mechanism for regulating pressure is built into the liner lower cover of the hydraulic impact torque generating section, so it has the advantage that the liner and the liner lower cover can be easily aligned in alignment. .

[Brief explanation of the drawing]

Figure 1 is an IfI view of an embodiment of a hydraulic torque wrench.
FIG. 2 is a cross-sectional view of a part of the liner, where A shows the state in which a false strike occurs during normal rotation, and B shows the state when reverse rotation occurs. FIG. 8 is an explanatory view of the lower liner 1, FIG. '4 is a sectional view of the regulating valve, and FIG. 5 is a different embodiment. 1 is the main body, 2 is the main valve, 8 is the forward/reverse rotation switching valve, 4 is the rotor, 6 is the hydraulic lid torque generator, 7 is the king N, 7a, sa are the sealing surfaces, 8 is the liner, 9 is the feather,
10 is an output adjustment hole, 11 is an adjustment valve insertion hole, 12 is a hole, 1
8 is a liner jacket, 14 is a liner lower cover, 15 is an adjustment valve, 16 is a suction valve, 17 is a liner case, H and L are liner room patent applicant Uryu Manufacturing Co., Ltd. Agent Ike 1) Makio, 41 ・Δ,: ;2, 1 person Figure 1 (A) Figure 2 (B) Figure 5 (A) Figure 4 4

Claims (1)

[Claims] In a hydraulic torque wrench equipped with a hydraulic impact torque generating device that is rotated by the rotor of an air motor that rotates with turbid pressure air, a raw glaze with blades is rotatably inserted into the liner, and the liner is A liner chamber is formed by abutting a liner lower lid and a liner upper lid at both ends, and a pressure adjustment hole is bored in the liner lower lid to conduct the high pressure side and low pressure side of the liner chamber formed when the liner rotates. This is an impact torque adjustment device for a hydraulic torque wrench, which is characterized by having an adjustment valve installed in this hole.