CN111195883A

CN111195883A - Oil pulse unit of pneumatic tool

Info

Publication number: CN111195883A
Application number: CN201811375549.3A
Authority: CN
Inventors: 张新和
Original assignee: Airboss Air Tool Co Ltd
Current assignee: Airboss Air Tool Co Ltd
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2020-05-26

Abstract

The invention relates to an oil pressure pulse unit of a pneumatic tool, which comprises a cylinder body, an output shaft and a pressure reducing valve; wherein, the cylinder body comprises a hydraulic oil containing chamber and a pressure reducing chamber which are communicated; the output shaft is coaxially arranged on the cylinder body and penetrates through the hydraulic oil accommodating chamber; the pressure reducing valve is arranged in the pressure reducing chamber and comprises a piston and a plurality of disc springs, and the disc springs are abutted against the piston; the piston arranged in the invention can move in the pressure reduction chamber under the action of the pressure of the hydraulic oil and the thrust of the disc spring, so that the flowing space of the hydraulic oil is adjusted along with the pressure of the hydraulic oil, and the problem of unstable output torque force generated by the pressure of the hydraulic oil along with the temperature rise of the hydraulic oil pulse unit of the conventional pneumatic tool can be solved, so that the hydraulic oil pulse unit of the pneumatic tool can maintain the output torque force by adjusting the pressure of the hydraulic oil.

Description

Oil pulse unit of pneumatic tool

Technical Field

The present invention relates to a fluid pressure driven impact tool, and more particularly, to a hydraulic pulse unit for a pneumatic tool capable of adjusting hydraulic pressure and maintaining output torque.

Background

A pneumatic tool is an impact tool driven by pressurized gas, which allows a user to perform various kinds of disassembly and assembly works with less effort and at high speed. The existing pneumatic tools generate torque force in two ways: the pneumatic tool is characterized in that a rotor, a hammering group driven by the rotor and an output shaft driven by the hammering group are arranged in the pneumatic tool, the pneumatic tool drives the rotor to rotate through high-pressure gas, the hammering group impacts the output shaft again, and the fixing piece is forced through the output shaft.

As shown in fig. 8 and 9, in another way of generating torque, high pressure gas is introduced to drive a rotor 70, the rotor 70 drives an oil pulse unit 80, the oil pulse unit 80 contains hydraulic oil, and the hydraulic oil is used as a medium for force transmission to impact an output shaft 90 to tighten the fixing member.

The pneumatic tool provided with the oil pressure pulse unit is popular in the market due to the advantages of small vibration, small noise and the like; however, as shown in fig. 10, a curve a of fig. 10 represents the temperature and pressure of the hydraulic oil, a curve B of fig. 10 represents the torque of the pneumatic tool, as the operation time of the pneumatic tool increases, the hydraulic oil repeatedly acts and rubs inside the oil pulse unit, so that the temperature of the hydraulic oil rises, the volume of the hydraulic oil expands, the force of the hydraulic oil transmitted to the output shaft 90 also gradually decreases, and the hydraulic oil cannot output enough torque to tighten the fixing member; when the temperature and pressure of the hydraulic oil reach the highest, even the rotor 70 and the oil pulse unit 80 rotate synchronously but cannot drive the output shaft 90 to press the fixing member; therefore, the oil pulse unit 90 of the conventional pneumatic tool has room for improvement and advancement in the structural design.

Disclosure of Invention

In order to solve the problem of unstable output torque generated by the pressure of hydraulic oil along with the rise of temperature in the hydraulic pulse unit of the conventional pneumatic tool, the invention provides the hydraulic pulse unit of the pneumatic tool, wherein a pressure reducing valve is arranged on a cylinder body to reduce the pressure of the hydraulic oil in the cylinder body so as to achieve the purpose of stably outputting the torque.

The invention provides an oil pulse unit of a pneumatic tool, comprising:

the cylinder body is provided with a first end and a second end which are opposite, the cylinder body comprises a hydraulic oil accommodating chamber, a decompression accommodating chamber and a connecting channel, the decompression accommodating chamber extends from the second end of the cylinder body to the first end of the cylinder body, the connecting channel is arranged between the hydraulic oil accommodating chamber and the decompression accommodating chamber, and the connecting channel is communicated with the hydraulic oil accommodating chamber and the decompression accommodating chamber;

the output shaft is coaxially arranged in the cylinder body and penetrates through the hydraulic oil accommodating chamber, and comprises a working end which protrudes out of the first end of the cylinder body; and

a relief pressure valve, it installs in this relief pressure appearance room and including a piston, a sealing washer, an elastic component, a gasket and a snak link, this piston is including a relative first end and a second end, the first end of this piston is towards this intercommunication way, this piston is located to this sealing washer cover, and this sealing washer supports and leans on between the perisporium that holds room and this piston in this relief pressure, this elastic component is including a relative first end and a second end, the first end of this elastic component supports and leans on the second end in this piston, this snak link block holds room and backstop this elastic component in this relief pressure.

The oil pressure pulse unit of the pneumatic tool, wherein the pressure reducing valve comprises a gasket, and the gasket is abutted against the second end of the elastic component.

The oil pulse unit of the pneumatic tool, wherein the elastic member is a plurality of disc springs.

The oil pulse unit of the pneumatic tool, wherein the elastic component is a compression spring.

The technical means of the invention can obtain the following effect enhancement: the pressure reducing valve of the oil pressure pulse unit of the pneumatic tool is provided with the piston and the disc springs, the disc springs provide piston thrust, the piston can move in the pressure reducing chamber of the cylinder body under the action of the pressure of hydraulic oil and the thrust of the disc springs, and the flowing space of the hydraulic oil can be adjusted along with the pressure of the hydraulic oil, so that the oil pressure pulse unit of the pneumatic tool can provide stable torsion.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1 is a schematic cross-sectional view of a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional exploded assembly view of the preferred embodiment of the present invention.

Fig. 3 is a partial exploded view of the preferred embodiment of the invention.

Fig. 4 is an enlarged partial cross-sectional view of the preferred embodiment of the present invention.

FIG. 5 is a cross-sectional partial schematic view of the preferred embodiment of the present invention.

FIG. 6 is a cross-sectional partial schematic view of the preferred embodiment of the present invention.

Fig. 7 is a graph of torque output curves for a preferred embodiment of the present invention.

Fig. 8 is a schematic sectional view of a conventional pneumatic tool.

Fig. 9 is an enlarged cross-sectional schematic view of a prior art pneumatic tool.

Fig. 10 is a graph of torque output of a prior art pneumatic tool.

Detailed Description

So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings, wherein:

as shown in fig. 1, the preferred embodiment of the oil pulse unit of the pneumatic tool of the present invention comprises: a cylinder 10, an input shaft 20, an output shaft 30 and a pressure reducing valve 40; the input shaft 20 is disposed in the cylinder 10, and the output shaft 30 and the pressure reducing valve 40 are disposed in the cylinder 10.

As shown in fig. 1, the cylinder 10 includes an axial direction, a first end, a second end, a hydraulic oil chamber 11, a pressure reducing chamber 12 and a connecting channel 13; wherein the first end and the second end of the cylinder body 10 are opposite to each other in the axial direction of the cylinder body 10; the hydraulic oil chamber 11 extends from the first end of the cylinder 10 toward the second end of the cylinder 10; the decompression chamber 12 extends from the second end of the cylinder 10 toward the first end of the cylinder 10; the communication channel 13 is located between the hydraulic oil chamber 11 and the pressure reducing chamber 12, and the communication channel 13 communicates the hydraulic oil chamber 11 and the pressure reducing chamber 12.

As shown in fig. 1, the input shaft 20 is coaxially and integrally formed at the second end of the cylinder 10, the input shaft 20 is disposed along the axial direction of the cylinder 10 and includes a free end, the free end of the input shaft 20 can be combined with a rotor (not shown), the rotor can be driven by high-pressure gas to drive the cylinder 10 to rotate through the input shaft 20, and the structure of the rotor is prior art, so the present invention will not be described herein.

As shown in fig. 1, the output shaft 30 is coaxially coupled to the cylinder 10 and penetrates through the hydraulic oil chamber 11, the output shaft 30 includes a working end 31, the working end 31 protrudes out of the first end of the cylinder 10, and the working end 31 of the output shaft 30 can drive a bolt or a nut to rotate, so as to loosen or tighten a fixing member such as a bolt or a nut.

As shown in fig. 1, 2 and 3, the pressure reducing valve 40 is installed in the pressure reducing chamber 12 and includes a piston 41, a sealing ring 42, an elastic component, a gasket 44 and a spring buckle 45; wherein, the piston 41 includes a first end and a second end opposite to each other, and the first end of the piston 41 faces the communication channel 13; the sealing ring 42 is sleeved on the piston 41 and abuts against between the peripheral wall of the decompression chamber 12 and the piston 41; the elastic component includes a first end and a second end opposite to each other, the first end of the elastic component abuts against the second end of the piston 41, the elastic component can be configured as various elastic elements such as compression springs, in the preferred embodiment of the present invention, the elastic component is a plurality of disc springs 43, the plurality of disc springs 43 are disposed along the pressure reduction chamber 12, and the plurality of disc springs 43 abut against the second end of the piston 41, in the preferred embodiment of the present invention, because the space of the pressure reduction chamber 12 is narrow, the plurality of disc springs 43 can provide the elastic force of the piston 41 enough to load the pressure of the hydraulic oil in the narrow pressure reduction chamber 12, and the number of the plurality of disc springs 43 can be adjusted corresponding to the pressure of the hydraulic oil; the gasket 44 is disposed between the elastic element and the spring fastener 45 and abuts against the plurality of disc springs 43, the plurality of disc springs 43 are disposed between the piston 41 and the gasket 44; the spring buckle 45 is engaged with the decompression chamber 12 and abuts against the plurality of disc springs 43.

As shown in fig. 1, the hydraulic oil chamber 11 contains hydraulic oil to transmit force; as shown in fig. 4, when the pressure of the hydraulic oil in the hydraulic oil accommodating chamber 11 is smaller than the urging force provided by the plurality of disc springs 43 of the pressure reducing valve 40, the piston 41 of the pressure reducing valve 40 is urged by the plurality of disc springs 43 to stop the communication passage 13 of the cylinder 10.

As shown in fig. 5 and 6, after the pneumatic tool provided with the oil pulse unit of the present invention runs for a certain period of time, the temperature and volume of the hydraulic oil in the hydraulic oil accommodating chamber 11 increase with the running time, the pressure of the hydraulic oil also increases with the running time, and when the pressure of the hydraulic oil is greater than the thrust provided by the plurality of disc springs 43, the hydraulic oil pushes the piston 41 to move toward the second end of the cylinder 10, so that the communication channel 13 can communicate the hydraulic oil accommodating chamber 11 with the pressure reducing accommodating chamber 12, and the hydraulic oil can flow from the hydraulic oil accommodating chamber 11 to the pressure reducing accommodating chamber 12; at this time, since the space through which the hydraulic oil can flow is increased, the pressure of the hydraulic oil can be reduced, so that the oil pulse unit of the present invention can operate normally.

As shown in fig. 7, the plurality of cup springs 43 of the pressure reducing valve 40 of the present invention can provide a pushing force to the piston 41 of the pressure reducing valve 40, under the pressure of the hydraulic oil and the pushing force of the plurality of cup springs 43, the thin horizontal solid line of fig. 7 represents that the volume of the hydraulic oil accommodating chamber 11 is fixed, the piston 41 can move in the pressure reducing accommodating chamber 12 of the cylinder 10, so that the space through which the hydraulic oil flows can be adjusted according to the pressure of the hydraulic oil, and the wavy dotted line of fig. 7 represents that the temperature and pressure of the hydraulic oil are adjusted according to the operation of the pressure reducing valve 40, so that the output shaft 20 of the present invention can still provide a stable torsion after a period of operation time as shown by the thick solid line of fig. 7; furthermore, because the space of the decompression chamber 12 is narrow, the disc spring 43 used in the present invention, which can be loaded with heavy load, can provide sufficient elastic force to adjust the pressure of the hydraulic oil in an environment with limited space.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.

Claims

1. An oil pulse unit for a pneumatic tool, comprising:

2. The pneumatic tool oil pulse unit of claim 1 wherein said pressure relief valve includes a gasket abutting said second end of said resilient member.

3. The pneumatic tool oil pulse unit of claim 2 wherein said resilient member is a plurality of cup springs.

4. The oil pulse unit for a pneumatic tool as set forth in claim 1 or 2, wherein said elastic member is a compression spring.