Buffering hydraulic oil cylinder for tractor

Abstract

A buffering hydraulic oil cylinder for a tractor comprises a cylinder body, a piston and a piston rod, the piston is installed in the cylinder body in a sliding mode and divides an inner cavity of the cylinder body into a first cavity and a second cavity, a plurality of oil inlet channels are formed in the piston, and the oil inlet channels are communicated with the first cavity and the bottom of a piston assembly hole; the piston rod is a hollow piston rod, a floating piston is arranged in the piston rod, an inner cavity of the piston rod is divided into an air cavity and an oil cavity through the floating piston, one end of the piston rod penetrates through the cylinder cover to be connected to an assembly hole of the piston, and a gap is formed between the piston rod and the assembly hole. The gas channel is communicated with the gas cavity of the piston rod, a gas valve is installed on the gas channel, and high-pressure gas can be filled into the gas cavity of the piston rod through the gas valve. When the piston rod extends out, hydraulic oil in the first cavity enters the oil cavity of the piston rod through the oil inlet channel of the piston, the floating piston is pushed to move leftwards, high-pressure gas is compressed, and the buffering effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, in particular to a buffer hydraulic cylinder for a tractor. Background Art

[0002] Tractors are usually used as a power source to carry some additional agricultural machinery and implements to complete various agricultural operations during farming, such as fixing seeders, fertilizer spreaders, weeders, etc. through hydraulic cylinders. Hydraulic cylinders are hydraulic actuators that convert hydraulic energy into mechanical energy and perform linear reciprocating motion. However, in actual use, existing hydraulic cylinders usually do not have a buffering function. When the piston moves quickly to the end of the stroke, it will mechanically collide with the cylinder head and the cylinder bottom, generating a strong impact, which not only causes certain damage to the cylinder, but also affects the stability of the hydraulic cylinder. Summary of the invention

[0003] The utility model provides a buffer hydraulic cylinder for a tractor, which has the advantages of simple structure, good buffering effect and stable operation. The specific scheme is as follows:

[0004] A buffer hydraulic cylinder for a tractor comprises a cylinder body, a piston and a piston rod, characterized in that a cylinder head is installed at one end of the cylinder body, a first connecting piece is arranged at the other end of the cylinder body, the piston is slidably installed in the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity, a first oil port communicating with the first cavity and a second oil port communicating with the second cavity are arranged on the cylinder body, a plurality of oil inlet channels are arranged on the piston, and the oil inlet channels are communicated with the first cavity and the bottom of the piston assembly hole; the piston rod is a hollow piston rod, a floating piston is arranged inside, and the inner cavity of the piston rod is divided into an air cavity and an oil cavity by the floating piston, one end of the piston rod passes through the cylinder head and is connected to the assembly hole of the piston, a gap is provided between the assembly hole and the end face of the piston rod, so that the hydraulic oil in the first cavity can flow into the oil cavity of the piston rod through the gap, a second connecting piece is arranged at one end of the piston rod away from the piston, a gas channel is opened on the second connecting piece, the gas channel is communicated with the gas cavity of the piston rod, a gas valve is arranged on the gas channel, and the gas cavity of the piston rod can be filled with high-pressure gas through the gas valve.

[0005] Furthermore, an internal thread section is provided on the assembly hole of the piston, and an external thread matching the internal thread section of the assembly hole is provided at one end of the piston rod, and the piston rod is screwed into the internal thread section of the assembly hole to achieve connection with the piston; an annular groove is provided below the internal thread section of the assembly hole, and the annular groove is connected to the oil inlet hole of the piston rod.

[0006] Furthermore, a plurality of oil inlet channels are evenly distributed along the circumferential direction of the piston assembly hole, one end of the oil inlet channel is communicated with the first cavity of the cylinder body, and the other end of the oil inlet channel is communicated with the annular groove of the piston assembly hole.

[0007] Furthermore, an annular sealing groove is provided on the outer surface of the piston, and a sealing ring is installed in the annular sealing groove and cooperates with the inner wall of the cylinder body in a sliding and sealing manner.

[0008] Furthermore, an annular step surface is provided inside one end of the piston rod away from the second connecting member, and the floating piston can be stopped by the annular step surface to prevent the floating piston from escaping from the piston rod.

[0009] Furthermore, one end of the second connecting member is provided with an external thread, and the end of the piston rod away from the step surface is provided with an internal thread matching the external thread of the second connecting member, and the second connecting member is screwed into the internal thread of the piston rod to achieve connection with the piston rod.

[0010] Furthermore, an annular sealing groove is provided on the outer surface of the floating piston, and a sealing ring is installed on the annular sealing groove and cooperates with the inner wall of the piston rod in a sliding and sealing manner.

[0011] Furthermore, an annular sealing groove is provided on the inner surface of the cylinder cover, and a sealing ring is installed in the annular sealing groove to cooperate with the piston rod in a sliding seal.

[0012] Furthermore, an annular sealing groove is provided on the outer surface of the cylinder head, and a sealing ring is installed in the annular sealing groove, so that the cylinder head and the cylinder body are sealed and connected via the sealing ring.

[0013] Furthermore, the gas channel is L-shaped.

[0014] The utility model has a simple structure and a reasonable design. The inner cavity of the piston rod is divided into an air cavity and an oil cavity by a floating piston. The air cavity of the piston rod is filled with high-pressure gas. When the piston pushes the piston rod to extend, the hydraulic oil in the first cavity of the cylinder body enters the oil cavity of the piston rod through the oil inlet channel of the piston and pushes the floating piston to move leftward, compressing the high-pressure gas to achieve a buffering effect, and can protect the hydraulic oil cylinder from damage. The buffering effect is good and the operation is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a top view of the utility model;

[0017] Figure 3 yes Figure 2 The cross-sectional view of the AA surface;

[0018] Figure 4 yes Figure 3 A cross-sectional view of the BB surface;

[0019] Figure 5 It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, function and specific design scheme of the utility model, the buffer hydraulic cylinder for a tractor of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-Figure 5 As shown, the buffer hydraulic cylinder for a tractor of the utility model comprises a cylinder body 1, a piston 5 and a piston rod 6. A cylinder cover 2 is installed at one end of the cylinder body 1, and a first connecting member 11 is provided at the other end of the cylinder body 1. An annular sealing groove is provided on the outer surface of the cylinder cover 2, and a sealing ring is installed in the annular sealing groove, so that the cylinder cover 2 and the cylinder body 1 are sealed and connected via the sealing ring.

[0022] The piston 5 is slidably mounted in the cylinder body 1, and the inner cavity of the cylinder body 1 is divided into a first cavity 14 and a second cavity 15 by the piston 5. The cylinder body 1 is provided with a first oil port 12 communicating with the first cavity 14 and a second oil port 13 communicating with the second cavity 15. The piston 5 is provided with a plurality of oil inlet channels 51, which are communicated with the first cavity 14 of the cylinder body 1 and the bottom of the piston assembly hole 52.

[0023] The piston rod 6 is a hollow piston rod, and a floating piston 7 is arranged inside the piston rod 6. The inner cavity of the piston rod 6 is divided into an air cavity 61 and an oil cavity 62 by the floating piston 7. The outer surface of the floating piston 7 is provided with an annular sealing groove, and a sealing ring is installed on the annular sealing groove. The outer wall of the sealing ring is slidably sealed and connected to the inner wall of the piston rod 6.

[0024] One end of the piston rod 6 passes through the cylinder head 2 and is connected to the assembly hole 52 of the piston 5. There is a gap between the assembly hole 52 and the end surface of the piston rod 6 (the gap is the annular groove 522 of the assembly hole 52), so that the hydraulic oil in the first cavity 14 can flow into the piston rod 6 through the gap. The end of the piston rod 6 away from the piston 5 is provided with a second connecting member 3, and the second connecting member 3 is provided with a gas channel 31. The gas channel 31 is L-shaped and communicates with the gas cavity 61 of the piston rod 6. A gas valve 4 is installed on the gas channel 31, and high-pressure gas can be filled into the gas cavity 61 of the piston rod 6 through the gas valve 4.

[0025] The assembly hole 52 of the piston 5 is provided with an internal thread section 521, and one end of the piston rod 6 is provided with an external thread matching the internal thread section 521 of the assembly hole 52. The piston rod 6 is screwed into the internal thread section 521 of the assembly hole 52 to achieve connection with the piston 5. An annular groove 522 is provided below the internal thread section 521 of the assembly hole 52, and the annular groove 522 is communicated with the oil inlet hole 64 of the piston rod 6.

[0026] Multiple oil inlet channels 51 are evenly distributed along the circumferential direction of the piston assembly hole 52 , one end of the oil inlet channel 51 is connected to the first cavity 14 of the cylinder body 1 , and the other end of the oil inlet channel 51 is connected to the annular groove 522 of the piston assembly hole 52 .

[0027] The outer surface of the piston 5 is provided with an annular sealing groove, in which a sealing ring is installed to slide and seal with the inner wall of the cylinder body 1 .

[0028] An annular step surface 63 is provided inside one end of the piston rod 6 away from the second connecting member 3 , and the floating piston 7 can be stopped by the annular step surface 63 to prevent the floating piston 7 from escaping from the piston rod 6 .

[0029] One end of the second connecting member 3 is provided with an external thread, and the end of the piston rod 6 away from the step surface 63 is provided with an internal thread matching the external thread of the second connecting member 3 . The second connecting member 3 is screwed into the internal thread of the piston rod 6 to achieve connection with the piston rod 6 .

[0030] When in use, the second connecting member 3 is connected to the tractor, the first connecting member 11 is connected to the agricultural machinery, and high-pressure gas is filled into the air cavity 61 of the piston rod 6 through the gas valve 4. When the piston rod 6 is extended, the hydraulic oil in the first cavity 14 of the cylinder body 1 enters the oil cavity 62 of the piston rod 6 through the oil inlet channel 51 and the annular groove 522, and pushes the floating piston 7 to move to the left, compressing the high-pressure gas, thereby achieving a buffering effect.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A buffer hydraulic cylinder for a tractor, comprising a cylinder body, a piston and a piston rod, characterized in that: A cylinder cover is installed at one end of the cylinder body, and a first connecting piece is provided at the other end of the cylinder body. The piston is slidably installed in the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity. A first oil port connected to the first cavity and a second oil port connected to the second cavity are provided on the cylinder body. A plurality of oil inlet channels are provided on the piston, and the oil inlet channels are connected to the first cavity and the bottom of the piston assembly hole; the piston rod is a hollow piston rod, and a floating piston is provided inside. The inner cavity of the piston rod is divided into an air cavity and an oil cavity by the floating piston. One end of the piston rod passes through the cylinder cover and is connected to the assembly hole of the piston. There is a gap between the assembly hole and the end face of the piston rod, so that the hydraulic oil in the first cavity can flow into the oil cavity of the piston rod through the gap. A second connecting piece is provided at the end of the piston rod away from the piston, and a gas channel is opened on the second connecting piece. The gas channel is connected to the gas cavity of the piston rod, and a gas valve is installed on the gas channel. High-pressure gas can be filled into the gas cavity of the piston rod through the gas valve.

2. The buffer hydraulic cylinder for a tractor according to claim 1, characterized in that: An internal thread section is provided on the assembly hole of the piston, and an external thread matching the internal thread section of the assembly hole is provided at one end of the piston rod. The piston rod is screwed into the internal thread section of the assembly hole to achieve connection with the piston; an annular groove is provided below the internal thread section of the assembly hole, and the annular groove is connected to the oil inlet hole of the piston rod.

3. The buffer hydraulic cylinder for a tractor according to claim 2, characterized in that: A plurality of oil inlet channels are evenly distributed along the circumferential direction of the piston assembly hole, one end of the oil inlet channel is communicated with the first cavity of the cylinder body, and the other end of the oil inlet channel is communicated with the annular groove of the piston assembly hole.

4. The buffer hydraulic cylinder for a tractor according to claim 3, characterized in that: The outer surface of the piston is provided with an annular sealing groove, in which a sealing ring is installed to slide and seal with the inner wall of the cylinder body.

5. The buffer hydraulic cylinder for a tractor according to claim 1, characterized in that: An annular step surface is provided inside one end of the piston rod away from the second connecting member, and the floating piston can be stopped by the annular step surface to prevent the floating piston from escaping from the piston rod.

6. The buffer hydraulic cylinder for a tractor according to claim 5, characterized in that: One end of the second connecting member is provided with an external thread, and the end of the piston rod away from the step surface is provided with an internal thread matching the external thread of the second connecting member. The second connecting member is screwed into the internal thread of the piston rod to achieve connection with the piston rod.

7. The buffer hydraulic cylinder for a tractor according to claim 1, characterized in that: The outer surface of the floating piston is provided with an annular sealing groove, and a sealing ring is installed on the annular sealing groove and cooperates with the inner wall of the piston rod in a sliding and sealing manner.

8. The buffer hydraulic cylinder for a tractor according to claim 1, characterized in that: The inner surface of the cylinder cover is provided with an annular sealing groove, in which a sealing ring is installed to cooperate with the piston rod in sliding sealing.

9. The buffer hydraulic cylinder for a tractor according to claim 8, characterized in that: An annular sealing groove is provided on the outer surface of the cylinder cover, and a sealing ring is installed in the annular sealing groove, so that the cylinder cover and the cylinder body are sealed and connected via the sealing ring.

10. The buffer hydraulic cylinder for a tractor according to claim 1, characterized in that: The gas channel is L-shaped.

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