WO2022134445A1

WO2022134445A1 - Hydraulic jack with oil return structure

Info

Publication number: WO2022134445A1
Application number: PCT/CN2021/094899
Authority: WO
Inventors: 王新宇; 殷子豪; 居玲
Original assignee: 常熟通润汽车零部件股份有限公司
Priority date: 2020-12-23
Filing date: 2021-05-20
Publication date: 2022-06-30
Also published as: CN112573418A

Abstract

The present invention belongs to the field of hydraulic lifting, and in particular relates to a hydraulic jack with an oil return structure. The hydraulic jack with the oil return structure comprises an oil cylinder, an oil storage cavity, a base, and an oil return valve rod. The base is provided with a first oil way communicating with the oil cylinder, and an oil return way communicating with the oil storage cavity; an oil return channel and an oil return hole are formed in an end of the oil return valve rod; the oil return channel communicates with the oil return way by means of the oil return hole; a second steel ball is mounted in the oil return channel by means of a spring, and the second steel ball and the oil return channel are in clearance fit with each other; and a first steel ball is arranged in an oil return valve cavity, and when the oil return valve rod is screwed into the limit position of an oil return valve rod mounting channel, the first steel ball blocks the first oil way; and when the oil return valve rod is unscrewed, the first steel ball unblocks the first oil way, and then the first oil way, the oil return valve cavity, the oil return channel and the oil return way communicate with one another. According to the present application, a low-speed structure is arranged in the oil return valve rod, and oil leakage of a process hole is thus effectively avoided.

Description

A hydraulic jack with oil return structure

technical field

The invention belongs to the field of hydraulic lifting, in particular to a hydraulic jack with an oil return structure.

Background technique

Jacks are commonly used equipment in the field of vehicle repairs, and are also commonly used lifting equipment in the industrial field. Slow oil return is an essential feature of the jack. The existing slow-speed oil return structure realizes the function of load slow-speed oil return through the cooperation of the steel ball at the bottom of the cylinder on the base and the valve line. When there is no load, the steel ball is pushed open by the spring, the oil passage of the oil return hole is unobstructed, and the boom drops rapidly; while when it is loaded, the pressure inside the oil cylinder is greater than the elastic force of the spring, the steel ball is pushed on the oil return hole, and the oil is only The valve line that can pass through the oil return hole slowly returns to the oil storage chamber, so as to realize the slow reduction of the boom load.

However, the applicant found that the existing slow oil return structure has the following technical problems:

1. The process hole is subjected to high pressure during load, which is prone to oil leakage.

2. The maintenance is more complicated, and the hydraulic components need to be disassembled.

SUMMARY OF THE INVENTION

The present application provides a hydraulic jack with an oil return structure, wherein the slow speed structure is arranged inside the oil return valve stem to effectively avoid oil leakage from the process hole.

In order to achieve the above technical purpose, the technical solution adopted in this application is a hydraulic jack with an oil return structure, including an oil cylinder, an oil storage cavity, a base and an oil return valve rod;

The base is provided with a first oil circuit that communicates with the oil cylinder, and is connected to the oil return oil circuit of the oil storage chamber; and also is provided with an oil return valve rod installation channel, and the oil return valve rod installation channel is connected to the first oil circuit. Coaxial design, and the diameter of the oil return valve stem installation channel is larger than the diameter of the first oil circuit;

The end of the oil return valve rod is provided with an oil return passage along its own axial direction, and an oil return hole is arranged along its own radial direction; the oil return passage is communicated with the oil return oil passage through the oil return hole ; wherein, the oil return valve rod is fixed with a gasket at the end of the oil return channel, and the gasket is provided with an oil inlet groove; the oil return valve rod is installed in the oil return valve rod installation channel , and an oil return valve cavity is formed between the gasket and the oil return valve stem installation channel;

Wherein, a second steel ball is installed in the oil return channel through a spring, and a clearance fit is adopted between the second steel ball and the oil return channel; a first steel ball is built in the oil return valve cavity, which is in the When the oil return valve rod is screwed into the limit position of the installation channel of the oil return valve rod, the first steel ball blocks the first oil circuit; when the oil return valve rod is unscrewed (screwed out), the first steel ball A steel ball unseals the first oil circuit, and the first oil circuit, the oil return valve cavity, the oil return passage and the oil return oil circuit are connected.

As an improved technical solution of the present application, the gasket is a boss-shaped gasket.

As an improved technical solution of the present application, the gasket and the end of the oil return passage adopt an interference fit.

As an improved technical solution of the present application, the oil return oil passage and the first oil passage form an acute angle.

As an improved technical solution of the present application, the oil return channel includes a large-diameter oil return channel and a small-diameter oil return channel designed coaxially, and the gasket is provided at the end of the large-diameter oil return channel; The second steel ball is installed in the large-diameter oil return channel, and there is a gap between the large-diameter oil return channel and the large-diameter oil return channel. At the same time, under the condition of pressure, the oil return valve stem is loosened, and the first steel ball unseals the first oil The oil enters the oil return valve stem through the first oil channel, and the second steel ball in the rod is compressed to compress the spring. In this state, when the second steel ball blocks the small-diameter oil return channel, the oil passes through the second steel ball. The valve line left between the small diameter oil return channel and the oil return channel enters the oil return hole; the oil return hole is arranged on the small diameter oil return channel; by definition, the large diameter oil return channel is the diameter opposite to the oil return channel. The diameter of the oil return passage with the small diameter is large.

As an improved technical solution of the present application, a threaded connection is adopted between the oil return valve rod installation channel and the oil return valve rod; and the oil return valve rod is provided with a sealing ring at the end of the threaded connection.

beneficial effect

The oil return structure of the present application avoids designing process holes on the oil circuit, that is, avoiding oil leakage in the oil return oil circuit caused by the process holes;

In this application, a valve line is used to realize slow oil return, and the valve line is "the small groove left between the second steel ball and the inner wall of the oil return valve cavity"; compared with the thread of the valve stem in the prior art Oil return is carried out in the gap, and the slow oil return process of the present application is more stable; and maintenance is convenient.

The main improvement point of the oil return structure of the present application is set on the oil return valve stem. Different jacks only need to replace the oil return valve stem to achieve different oil return speeds, so that the base has a high degree of versatility.

Description of drawings

FIG. 1 is a schematic structural diagram of the oil return structure of the present application;

FIG. 2 is a schematic view of the structure of the gasket;

3 is a schematic exploded view of the oil return structure of the present application;

In the figure: 1, the first oil circuit; 2, the gasket; 3, the oil inlet; 4, the valve line; 5, the oil return hole; 6, the oil return valve stem; 7, the spring; 8, the second steel ball; 9 , the first steel ball; 10, the oil return circuit; 11, the oil storage cavity.

The direction of arrow A represents the direction in which the oil return valve stem is screwed out; the direction of arrow B represents the direction in which the oil return valve stem is screwed in.

Detailed ways

In order to make the purpose and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In this application, the oil return valve cavity is arranged at the connection between the base and the oil return valve stem 6, and the main body of the oil return structure is arranged on the oil return valve stem 6; and the first steel ball 9 and the second steel ball 8 are used. The opening and sealing of the oil return oil circuit 10 can be realized by cooperation. Specifically, when the oil return valve rod 6 is rotated out of the oil return valve rod installation channel, the gasket 2 is far away from the first steel ball 9, the first steel ball 9 releases the blocking of the first oil circuit 1, and the liquid in the oil cylinder passes through the return valve. The oil valve cavity, the gap between the second steel ball 8 and the oil return passage and the oil return hole 5 flow to the oil storage cavity 11 . When the oil return valve stem 6 is tightened, the gasket 2 pushes the first steel ball 9, and the first steel ball 9 blocks the first oil circuit 1. At this time, the oil return oil circuit is completely closed, and the jack is in a pressure-bearing state. normal working condition.

In order to better explain the technical solutions of the present application, the following detailed descriptions are given in conjunction with the embodiments:

Example 1

As shown in Figure 1, Figure 2 and Figure 3, a hydraulic jack with an oil return structure includes an oil cylinder, an oil storage chamber 11, a base and an oil return valve stem 6;

The base is provided with a first oil circuit 1 that communicates with the oil cylinder, and an oil return oil circuit 10 that communicates with the oil storage chamber 11; an oil return valve rod installation channel is also provided, and the oil return valve rod installation channel is connected to the first oil return valve rod. An oil circuit 1 is designed with a coaxial line, and the diameter of the installation channel of the oil return valve rod is larger than the diameter of the first oil circuit 1;

The end of the oil return valve rod 6 is provided with an oil return passage along its own axial direction, and an oil return hole 5 along its own radial direction; Oil circuit 10; wherein, the oil return valve rod 6 is fixed with a gasket 2 at the end of the oil return channel, and the gasket 2 is provided with an oil inlet groove 3; the oil return valve rod 6 is installed on the In the oil return valve stem installation channel, and an oil return valve cavity is formed between the gasket 2 and the oil return valve stem installation channel;

Wherein, a second steel ball 8 is installed in the oil return passage through a spring 7, and a clearance fit is adopted between the second steel ball 8 and the oil return passage; a first steel ball is built in the oil return valve cavity Ball 9, when the oil return valve rod 6 is screwed into the limit position of the oil return valve rod installation channel, the first steel ball 9 blocks the first oil circuit 1; when the oil return valve rod 6 is loosened , the first steel ball unseals the first oil circuit, the first oil circuit 1, the oil return valve cavity, the oil return passage and the oil return oil circuit 10 are connected.

As an improved technical solution of the present application, the gasket 2 adopts a boss-shaped gasket 2; and the gasket 2 adopts an interference fit with the end of the oil return passage.

As an improved technical solution of the present application, the oil return oil passage 10 forms an acute angle with the first oil passage 1 .

As an improved technical solution of the present application, the oil return channel includes a large-diameter oil return channel and a small-diameter oil return channel designed coaxially, and the gasket is provided at the end of the large-diameter oil return channel; The second steel ball is installed in the large-diameter oil return channel, and there is a valve line 4 (that is, a gap) between the large-diameter oil return channel and the large-diameter oil return channel. The ball unseals the first oil circuit, the oil enters the oil return valve stem through the first oil circuit, and the second steel ball in the rod is compressed to compress the spring. In this state, when the second steel ball blocks the small diameter oil return channel, the oil The liquid enters the oil return hole through the valve line left between the second steel ball and the small diameter oil return channel; the oil return hole is set on the small diameter oil return channel; definition, the large diameter oil return channel is The diameter of the oil return passage is larger than the diameter of the small diameter oil return passage.

As an improved technical solution of the present application, a threaded connection is adopted between the oil return valve rod installation channel and the oil return valve rod 6; and the oil return valve rod 6 is provided with a sealing ring at the end of the threaded connection.

The application process is: the hydraulic components are unloaded, the oil return valve rod 6 is rotated out to the A direction, the first oil circuit 1 is low pressure at this time, the oil flushes the first steel ball 9, and passes through the oil inlet groove on the boss gasket 2 3 Enter the inside of the oil return valve stem 6; due to the low pressure inside the oil return valve stem 6 (the oil return valve cavity), the pressure on the second steel ball 8 cannot make it close the oil circuit, and the oil passes through the inside of the oil return valve stem 6 first. The gap between the steel ball 9 and the oil return passage, and the oil return hole 5 quickly enter the oil return oil circuit 10, so as to return to the oil storage chamber 11; the boom is quickly lowered when it is not loaded.

When the hydraulic components are loaded, the oil return valve rod 6 rotates out to the A direction. At this time, the first oil circuit 1 is under high pressure, and the oil flushes the first steel ball 9 and enters the oil return valve through the oil inlet groove 3 on the boss gasket 2 Inside the rod 6, at this time, the high pressure inside the oil return valve rod 6, the spring 7 is compressed, and the second steel ball 8 is pushed to the small diameter oil return channel inside the oil return valve rod 6 (because the second steel ball 8 and the small diameter There is a valve line 4) between the oil return passages, so that the oil can only slowly enter the first oil return hole 5 through the valve line 4, and then return to the oil storage chamber 11, so as to realize the slow descent of the boom under load.

The above is only an embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims

A hydraulic jack with an oil return structure is characterized by comprising an oil cylinder, an oil storage cavity, a base and an oil return valve rod;

The base is provided with a first oil circuit that communicates with the oil cylinder, and is connected to the oil return oil circuit of the oil storage chamber; and also is provided with an oil return valve rod installation channel, and the oil return valve rod installation channel is connected to the first oil circuit. Coaxial design, and the diameter of the oil return valve stem installation channel is larger than the diameter of the first oil circuit;

The end of the oil return valve rod is provided with an oil return passage along its own axial direction, and an oil return hole is arranged along its own radial direction; the oil return passage is communicated with the oil return oil passage through the oil return hole ; wherein, the oil return valve rod is fixed with a gasket at the end of the oil return channel, and the gasket is provided with an oil inlet groove; the oil return valve rod is installed in the oil return valve rod installation channel , and an oil return valve cavity is formed between the gasket and the oil return valve stem installation channel;

Wherein, a second steel ball is installed in the oil return channel through a spring, and a clearance fit is adopted between the second steel ball and the oil return channel; a first steel ball is built in the oil return valve cavity, which is in the When the oil return valve rod is screwed into the limit position of the installation channel of the oil return valve rod, the first steel ball blocks the first oil circuit; when the oil return valve rod is loosened, the first steel ball is released. The first oil circuit is sealed, and the first oil circuit, the oil return valve cavity, the oil return passage and the oil return oil circuit are communicated.
The hydraulic jack with an oil return structure according to claim 1, wherein the gasket is a boss-shaped gasket.
The hydraulic jack with an oil return structure according to claim 1, wherein the gasket and the end of the oil return passage adopt an interference fit.
The hydraulic jack with an oil return structure according to claim 1, wherein the oil return oil passage and the first oil passage form an acute angle.
The hydraulic jack with an oil return structure according to claim 1, wherein the oil return passage comprises a large diameter oil return passage and a small diameter oil return passage which are coaxially designed, and the gasket is provided on the The end of the large-diameter oil return channel; the second steel ball is installed in the large-diameter oil return channel, and there is a gap between the large-diameter oil return channel and the large diameter oil return channel. At the same time, under the condition of pressure, the oil return valve The rod is loosened, the first steel ball unseals the first oil circuit, the oil enters the oil return valve stem through the first oil circuit, and the second steel ball in the rod is compressed to compress the spring. In this state, the second steel ball is less blocked. When the diameter of the oil return channel is used, the oil enters the oil return hole through the valve line left between the second steel ball and the small diameter oil return channel; the oil return hole is arranged on the small diameter oil return channel; The large diameter oil return passage means that the diameter of the oil return passage is larger than the diameter of the small diameter oil return passage.
The hydraulic jack with an oil return structure according to claim 1, wherein the oil return valve rod installation channel and the oil return valve rod are connected by threads; and the oil return valve rod is in the The end of the threaded connection is provided with a sealing ring.