JP4468605B2 - Wrench hydraulic hitting torque generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic striking torque generator used for a wrench, and in particular, eliminates displacement of a shaft portion due to cutting allowance of a blade insertion groove, shortens a main shaft, and increases a width of the shaft portion to provide a seal. The present invention relates to a hydraulic striking torque generator for a wrench that can easily ensure the performance.
[0002]
[Prior art]
A hydraulic wrench used in a bolting operation or the like includes a hydraulic hitting torque generator that generates hitting torque on a main shaft.
This hydraulic striking torque generator is configured to insert a main shaft into a cavity of a liner that is rotated by a rotational drive source, for example, a rotor, and to displace a driving blade in a blade insertion groove formed on the main shaft, An impact torque is generated when the sealing surface of the driving blade matches the sealing surface of the inner peripheral surface of the cavity.
[0003]
In this hydraulic striking torque generator, when the striking torque is generated, the inside of the liner filled with hydraulic fluid has a high pressure, so that the shaft support portion of the main shaft supported by the liner needs to be sealed.
As shown in FIG. 4, conventionally, the shaft portions 13a ′ and 13b ′ of the main shaft 7 ′ are integrally formed with the main shaft 7 ′ before and after the blade insertion groove 7c.
[0004]
[Problems to be solved by the invention]
By the way, in order to reduce the burden on the operator, the hydraulic wrench is reduced in size and weight. However, in the conventional hydraulic striking torque generator, the shaft portions 13a ′ and 13b ′ are arranged before and after the blade insertion groove 7c. Since the shaft is integrally formed with the main shaft 7 ', the shaft portions 13a' and 13b 'are displaced back and forth by the semicircular cutting allowance A of the blade insertion groove 7c cut by the end mill. As a result, there is a problem that the main shaft 7 'becomes longer and the widths of the shaft portions 13a' and 13b 'become smaller and it becomes difficult to ensure the sealing performance.
[0005]
In view of the problems of the conventional hydraulic wrench torque generating device for a wrench, the present invention eliminates the displacement of the shaft portion due to the cutting allowance of the blade insertion groove, shortens the main shaft, and reduces the width of the shaft portion. It is an object of the present invention to provide a hydraulic striking torque generator for a wrench that can be made large to facilitate sealing.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the hydraulic striking torque generator for a wrench of the present invention has a main shaft fitted into a cavity of a liner that is rotated by a rotational drive source, and a driving blade can be moved in and out of a blade insertion groove formed on the main shaft. In the hydraulic striking torque generator for a wrench with the spindle part supported by the liner before and after the blade insertion groove, the shaft part on the front side of the spindle covers the cutting allowance of the blade insertion groove. And a ring member that is externally fitted and fixed to the main shaft, and a rear shaft portion of the main shaft is formed by a main shaft end portion and a ring member that is externally fixed to the main shaft end portion. To do.
[0007]
The hydraulic striking torque generator of this wrench has a ring member fitted on the front shaft portion so as to cover the cutting allowance of the blade insertion groove by the end mill, and the rear shaft portion has a spindle end. Since the ring member is fitted in the part, the main shaft is shortened by eliminating the displacement of the conventional shaft due to the cutting allowance of the blade insertion groove, and the width of the shaft is widened to ensure the sealing performance. Furthermore, the strength of the main shaft can be improved by covering the cutting allowance of the blade insertion groove formed on the main shaft with a ring member.
[0008]
In this case, the ring member can be brazed to the main shaft.
[0009]
Thereby, a main axis | shaft and a ring member can be integrated easily.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a hydraulic striking torque generator for a wrench according to the present invention will be described below with reference to the drawings.
[0011]
1 to 3 show an embodiment of a hydraulic striking torque generator for a wrench according to the present invention.
In FIG. 1, reference numeral 1 denotes a main body of a hydraulic wrench. A main valve 2 for supplying and stopping high-pressure air and a forward / reverse rotation switching valve 3 are provided in the main body 1, and a high pressure supplied from the valve group. It has a known hydraulic wrench air motor structure in which a rotor 4 as a rotational drive source is provided in the main body 1 so as to generate rotational torque by air.
In the front case 6 of the main body 1, a hydraulic hitting torque generator 5 that converts the rotational torque of the rotor 4 into hitting torque is provided.
[0012]
As shown in FIG. 3, the hydraulic striking torque generator 5 has a liner 8 in which a cavity 81 formed therein is rotatably disposed in a liner case 12, and the main shaft 7 is further disposed in the cavity 81 of the liner 8. Is rotatably arranged, and is filled and sealed with hydraulic oil for generating torque in the cavity 81 of the liner 8.
The main shaft 7 is provided with a pair of blade insertion grooves 7c on a diameter line passing through the center, and two driving blades 9 having a sealing surface 7b at the tip are inserted into the blade insertion grooves 7c. The driving blade 9 is urged by a spring S so as to be able to protrude and retract outward in the radial direction of the main shaft 7.
Further, the main shaft 7 between the two driving blades 9 is formed with a fixed seal surface 7a protruding slightly from the outer peripheral surface of the main shaft.
The blade insertion groove 7c can achieve its purpose if it is formed in a square groove. However, since the blade insertion groove 7c is cut by an end mill, which is a rotary tool, as shown in FIG. A semicircular cutting allowance A is formed.
[0013]
On the other hand, the liner 8 into which the main shaft 7 is inserted forms a seal surface 8a corresponding to the seal surface 7a of the main shaft 7 in the constricted portion of the cavity 81 having an eyebrows cross section, and the extended portion of the cavity 81 that opposes. A seal surface 8b corresponding to the seal surface 7b of the two driving blades 9 is formed on the inner peripheral surface of the two.
As a result, when the liner 8 rotates around the outer periphery of the main shaft 7, the seal surface 8a of the liner 8 matches the seal surface 7a of the main shaft 7, as shown in FIG. Sealing is performed in an air-tight manner so as to divide the cavity 81, and the sealing surface 8b of the liner 8 and the sealing surface 7b of the driving blade 9 also match, and the cavity 81 is divided into four chambers.
[0014]
An output adjustment valve insertion hole 10 is drilled in the vicinity of one seal surface 8a of the liner 8 in parallel with the axis of the liner 8, and a seal surface is formed at the back of the output adjustment valve insertion hole 10. Ports communicating with the cavities 81 on both sides with the 8a interposed therebetween are formed, and the output adjustment valve 11 is adjustably fitted in the output adjustment valve insertion hole 10.
[0015]
In this embodiment, in the hydraulic striking torque generator 5 as described above, as shown in FIGS. 1 and 2, the main shaft 7 is pivotally supported by the liner 8 before and after the blade insertion groove 7 c. The parts 13a and 13b are formed by steel ring members 14a and 14b that are fitted and fixed to the main shaft 7 in a sealed state. .
That is, in the hydraulic striking torque generator of the present embodiment, the shaft rack portion 13a on the front side of the main shaft 7 is formed by the ring member 14a that is externally fixed to the main shaft 7 so as to cover the cutting allowance A of the blade insertion groove 7c. In addition, the spindle end 13b on the rear side of the main shaft 7 is formed to have a small diameter so that the outer peripheral surface is located radially inward from the bottom of the blade insertion groove 7c adjacent to the main shaft 7, so that the machining allowance A cannot be made. It is formed by a portion 15 and a ring member 14b externally fixed to the spindle end portion 15.
A ring member in which the rear shaft portion 13b of the main shaft 7 is formed to have substantially the same diameter as the front shaft portion 13a and is externally fixed to the main shaft end portion 15 in the same manner as the front shaft portion 13a. The cutting allowance A of the blade insertion groove 7c can be covered by 14b.
[0016]
In this case, each ring member 14a, 14b and the main shaft 7 can be fixed by vacuum brazing with a metal such as copper because the main shaft 7 and the ring members 14a, 14b can be easily integrated. However, other fixing methods such as a method of fixing the ring members 14a and 14b by press-fitting into the main shaft 7 under vacuum can also be adopted.
[0017]
Thus, in the hydraulic striking torque generator of the present embodiment, the ring member 14a is fitted in the front shaft portion 13a so as to cover the cutting allowance A of the blade insertion groove 7c by the end mill. In the shaft mount portion 13b, the ring member 14b is fitted to the spindle end portion 15 whose diameter has been reduced so that the cutting allowance A does not occur. Therefore, the displacement of the conventional shaft mount portion due to the cutting allowance of the blade insertion groove is eliminated, and the spindle 7 can be shortened, and the width of the shaft rack portions 13a and 13b can be increased to facilitate the securing of the sealing performance. This makes it possible to reduce the size and weight of the hydraulic wrench and to reduce the O of the shaft rack portion 13a. By reducing the load on the ring 16, sealing performance can be secured, and further, by covering the cutting allowance A of the blade insertion groove 7c formed on the main shaft 7 with the ring member 14a (14b), Preventing blade insertion groove 7c occurrence of cracking of the main shaft 7 due to the expansion of, it is possible to improve the strength of the main shaft 7.
The main shaft 7 of this embodiment shown in FIG. 2 has the same length as that of the main shaft 7 ′ of the conventional example shown in FIG. While shortening by about 5 mm, the width | variety of each axle part 13a, 13b was able to be enlarged about 1 mm.
Further, by reducing the diameter of the spindle end 15 at the rear shaft portion 13b, it is not necessary to position and stop the end mill when cutting the blade insertion groove 7c, so that the end mill can be allowed to escape to the rear of the spindle 7. Therefore, the cutting of the blade insertion groove 7c can be facilitated.
[0018]
Next, the operation of the hydraulic wrench of this embodiment will be described.
When the main valve 2 and the switching valve 3 are operated and pressurized air is introduced into the rotor 4 in the main body 1, the rotor 4 rotates at a high speed. The rotational force of the rotor 4 is transmitted to a liner 8 provided integrally with the rotor shaft.
[0019]
In the state where the impact torque is generated on the main shaft 7, as shown in FIG. 3A, the seal surface 7a of the main shaft 7 and the seal surface 7b of the driving blade are in contact with the seal surfaces 8a and 8b of the liner 8, respectively. The cavity 81 of the liner 8 is divided into a pair of high-pressure chamber H and low-pressure chamber L formed substantially on both sides of each driving blade 9.
When the liner 8 is rotated to this state, a high pressure is generated in the high pressure chamber H, and the side surface of each driving blade 9 is momentarily pressed toward the low pressure chamber L by this hydraulic pressure, and the main shaft 7 into which the driving blade 9 is inserted. The striking force is transmitted to the main shaft 7 to generate a desired intermittent striking torque, thereby rotating the main shaft 7 to perform a desired operation.
[0020]
Then, after generating an impact torque on the main shaft 7 by hitting the driving blade 9, when the liner 8 further rotates 90 degrees, as shown in FIG. The two cavities 81 are formed to sandwich each other, the entire cavity 81 is divided into chambers of the same pressure, and the liner 8 further rotates without generating an impact torque on the main shaft 7.
Next, when the liner 8 is further rotated 90 degrees, the seal surface 8a of the liner 8 and the seal surface 7a of the main shaft are slightly shifted and do not coincide with each other, and a gap is generated between the seal surfaces 7a and 8a. The two high-pressure and low-pressure chambers formed between the driving blades 9 are connected to each other, and no impact torque is generated on the main shaft 7.
Further, in the state where the liner 8 is further rotated by 90 degrees, that is, 270 degrees from when the impact torque is generated, the position of the output adjustment valve insertion hole 10 is merely upside down from the 90-degree rotated state. No hitting torque is generated in 7.
When the liner 8 further rotates from this state, the initial state shown in FIG. 3A is obtained, and the impact torque is generated again as described above.
[0021]
The hydraulic striking torque generator for a wrench according to the present invention has been described based on one embodiment thereof. However, the present invention is not limited to the configuration described in the above embodiment. As the rotational drive source that moves, an electric motor is used in place of the rotor 4 (this makes it possible to more effectively demonstrate the effects of the present invention), and the like within a range that does not depart from the spirit thereof. The configuration can be changed.
[0022]
【The invention's effect】
According to the hydraulic striking torque generator for a wrench of the present invention, the ring member is fitted on the front shaft portion so as to cover the cutting allowance of the blade insertion groove by the end mill, and the rear shaft portion. Then, since the ring member is fitted to the end of the main shaft, the main shaft is shortened by eliminating the displacement of the conventional shaft due to the cutting allowance of the blade insertion groove, and the width of the main shaft is increased to improve the sealing performance. In addition, it is possible to improve the strength of the main shaft by covering the cutting allowance of the blade insertion groove formed on the main shaft with a ring member, thereby reducing the size and weight of the hydraulic wrench and sealing performance. It is possible to improve the stability of the operation by securing and the durability of the apparatus by improving the strength of the main shaft.
[0023]
Moreover, the main shaft and the ring member can be easily integrated by brazing the ring member to the main shaft.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a hydraulic striking torque generator for a wrench according to the present invention.
2A and 2B show a main axis of the same embodiment, in which FIG. 2A is a cross-sectional view, and FIG. 2B is a plan view.
FIG. 3 is an axial cross-sectional view showing the hydraulic striking torque generator of the embodiment.
4A and 4B show a conventional main shaft, wherein FIG. 4A is a cross-sectional view, and FIG. 4B is a plan view.
[Explanation of symbols]
1 Hydraulic Wrench Main Body 2 Main Valve 3 Switching Valve 4 Rotor (Rotation Drive Source)
DESCRIPTION OF SYMBOLS 5 Hydraulic type impact torque generator 6 Front case 7 Main shaft 7a, 7b Seal surface 7c Blade insertion groove 8 Liner 8a, 8b Seal surface 81 Cavity 9 Driving blade 10 Output adjustment valve insertion hole 11 Output adjustment valve 12 Liner case 13a Front shaft Rack 13b Rear shaft racks 14a, 14b Ring member 15 Spindle end 16 O-ring A Cutting allowance

Claims (2)

A main shaft is inserted into a cavity of a liner that is rotated by a rotational drive source, and a driving blade is disposed in a blade insertion groove formed on the main shaft so that the main shaft can be moved in and out. In the hydraulic striking torque generator for a supported wrench, the shaft on the front side of the main shaft is formed by a ring member externally fixed to the main shaft so as to cover the cutting allowance of the blade insertion groove, and the rear side of the main shaft The wrench's hydraulic striking torque generating device is characterized in that the shaft is formed by a main shaft end portion and a ring member externally fixed to the main shaft end portion. 2. The hydraulic striking torque generator for a wrench according to claim 1, wherein the ring member is brazed to the main shaft.

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