KR101885309B1 - Width control cylinder device for rear work part connection of tractor - Google Patents

Width control cylinder device for rear work part connection of tractor Download PDF

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Publication number
KR101885309B1
KR101885309B1 KR1020160016171A KR20160016171A KR101885309B1 KR 101885309 B1 KR101885309 B1 KR 101885309B1 KR 1020160016171 A KR1020160016171 A KR 1020160016171A KR 20160016171 A KR20160016171 A KR 20160016171A KR 101885309 B1 KR101885309 B1 KR 101885309B1
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South Korea
Prior art keywords
cylinder
piston
small
rod
hole
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KR1020160016171A
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Korean (ko)
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KR20170094889A (en
Inventor
김중호
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대호 (주)
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/002—Details, component parts
    • A01B59/004—Length-adjustable links
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/04—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor
    • A01B59/042—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor having pulling means arranged on the rear part of the tractor
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/06—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors

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  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

The present invention relates to a cylinder apparatus for controlling the width of a tractor rear work machine connection portion formed of a pair of left and right. The cylinder apparatus according to the present invention includes a small cylinder 11 and a large cylinder 12 which are formed inside the cylinder housing 10 and operate at the same displacement. The small cylinder (11) and the large cylinder (12) are in fluid communication with each other. On the other hand, the operating area of the rod side (large B-side) of the large piston 15 received in the large cylinder 12 and the piston side (small A side) of the small piston 14 received in the small cylinder 11, The operating displacement of the large piston 15 and the small piston 14 is controlled to be the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tractor rear-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a width adjusting cylinder apparatus of a tractor rear work machine connecting portion.

Tractors are used in the transportation or mechanized agriculture of crops. The tractor includes a loader capable of pivoting in the forward direction thereof. Such a loader may be provided with a structure for various operations such as bale clamp, bucket, hook, and the like. On the other hand, a variety of working machines such as a rotor batter, a trailer, and a doser can be installed behind the tractor.

The present inventor has filed a Korean Patent Application No. 10-2013-0080654 for a connecting device for connecting such various working machines to the rear of a tractor. The entire content of the above Korean patent application specification and drawings should be considered to be included in this specification.

1 is a drawing of the above Korean patent application. As shown in Fig. 1, the connecting device for connecting the working machine W to the rear of the tractor T includes an upper link T1 and a pair of left and right lower links T2. The working machine W is composed of an upper engaging portion W1 and a pair of left and right lower engaging portions W2 and linked with the connecting device at three points.

A pair of left and right lower connection portions 50 formed with upwardly open hooks 51 may be coupled to the pair of left and right lower links T2. The pair of left and right lower connection portions 50 are configured to be movable in the left and right direction and can be adjusted in width according to the positions of the pair of left and right lower coupling portions W2 formed in the working machine W. [

The above is an example of a connecting device for installing a working machine behind a tractor on which the present invention is based. The tractor rear connection device to which the present invention is applicable is not limited to the above-described structure. The structure of the present invention is applicable to any tractor rear connection device having a function of adjusting the width of a pair of right and left connection links.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a width adjusting cylinder device of a tractor rear work machine connection portion.

More specifically, it is an object of the present invention to provide a width-adjusting cylinder device of a tractor rear work machine connection portion including a double-rod cylinder operated at the same displacement, and having a function of correcting a discrepancy in displacement that can occur during operation .

In order to accomplish the above object, a representative structure of the present invention is as follows.

The present invention relates to a cylinder apparatus for controlling the width of a tractor rear work machine connection portion formed of a pair of left and right. The cylinder apparatus according to the present invention includes a small cylinder 11 and a large cylinder 12 which are formed inside the cylinder housing 10 and operate at the same displacement. The small cylinder (11) and the large cylinder (12) are in fluid communication with each other. On the other hand, the operating area of the rod side (large B-side) of the large piston 15 received in the large cylinder 12 and the piston side (small A side) of the small piston 14 received in the small cylinder 11, The operating displacement of the large piston 15 and the small piston 14 is controlled to be the same.

The cylinder apparatus according to the present invention is provided with a cylinder central portion 13 located between the small cylinder 11 and the large cylinder 12 and having a fluid communication path between the small cylinder 11 and the large cylinder 12, , A small piston side rod (16) connected to the small piston (14) and coupled to one side of the tractor rear working machine connection part, and a large piston side connected to the large piston (15) and connected to the other side of the tractor rear working machine connection part And may include a rod 17.

More specifically, in the cylinder apparatus according to the present invention, the working fluid introduced into the small cylinder 11 presses the small piston 14 to the cylinder central portion 13 during the contraction movement, The piston surface (small A-surface) pressurizes the working fluid through the fluid communication path formed in the cylinder central portion 13 to form the hydraulic pressure on the rod side (large B-side) of the large piston 15. [ The working fluid introduced into the large cylinder 12 presses the large piston 15 in a direction away from the cylinder center portion 13 and the load side of the large piston 15 Pressurizes the working fluid through the fluid communication path formed in the cylinder center portion 13 to form the hydraulic pressure on the piston surface (small A side) of the small piston.

The cylinder device for controlling the width of the pair of left and right tractor rear worker connecting portions according to the present invention includes a small cylinder 11 and a large cylinder 12 formed inside the cylinder housing 10 and operating at the same displacement Wherein the small cylinder (11) and the large cylinder (12) are in fluid communication with each other, and the small piston (14) accommodated in the small cylinder (11) and the large piston ) May be implemented such that an overload valve is provided, respectively.

The overload valve closes the through hole 19 of the piston by the load of the spring 20. When the working fluid is supplied at a pressure exceeding the load of the spring 20, the flow of the working fluid into the through hole 19 of the piston Lt; / RTI >

More specifically, the through-hole 19 is formed in the piston face (small A-face) of the small piston 14 and the piston face (large face) of the large piston 15, and the small piston side rod 16 And a spring 20 is mounted on the groove and the spring 20 urges the ball 21 toward the center portion 13 of the cylinder 13 So that the through hole 19 can be closed. When the hydraulic pressure applied in the expansion operation exceeds the load of the spring 20, the closing of the through hole 19 by the ball 21 is stopped and the through hole 19, the groove and the rods 16, 17) of the working fluid (flow path A).

The working fluid that has passed through the flow path A closes the opposite end of the small cylinder 11 and the large cylinder 12 on the side opposite to the cylinder center portion 13 and has a through hole of the rod 16, (Flow path B) formed by the space between the formed rod cover 18 and the rods 16 and 17 and then flows into the flow path formed in the end portion of the rod cover 18 on the side of the cylinder central portion 13 D) so that the working fluid can be communicated.

In addition, if necessary, a further configuration may be further included in the cylinder apparatus for controlling the width of the tractor rear worker connection portion formed by the left and right pair according to the present invention.

According to the present invention, there is provided a width adjusting cylinder device for a tractor rear work machine connection portion.

Particularly, by including the two-rod cylinders operated at the same displacement, not only the width adjustment of the pair of right and left connection link portions can be uniformly performed on both sides, but also the displacement mismatch that can occur during operation can be corrected .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing one example of a connecting device for installing a working machine behind a tractor on which the present invention is based; FIG.
2 is a view showing a contracted state of both rod cylinders in a width adjusting cylinder apparatus of a tractor rear work machine connecting portion according to the present invention.
3 is a view showing an expanded state of both rod cylinders in a width adjusting cylinder apparatus of a tractor rear work machine connecting portion according to the present invention.
FIG. 4 is a view showing the maximum expansion state of both rod cylinders in the width adjusting cylinder apparatus of the tractor rear worker connecting portion according to the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, the specific shapes, structures, and characteristics described herein may be implemented by changing from one embodiment to another without departing from the spirit and scope of the invention. It should also be understood that the location or arrangement of individual components within each embodiment may be varied without departing from the spirit and scope of the present invention. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention should be construed as encompassing the scope of the appended claims and all equivalents thereof.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

2 is a view showing a contracted state of both rod cylinders in a width adjusting cylinder apparatus of a tractor rear work machine connecting portion according to the present invention.

As shown in FIG. 2, the width adjusting cylinder device of the tractor rear work machine connecting part according to the present invention includes a cylinder housing 10, a small cylinder 11 is formed at one side of the cylinder housing 10, A large cylinder 12 is formed. The distinction between the small cylinder 11 and the large cylinder 12 is made of the relative cylinder volume. A cylinder center portion (13) is formed between the small cylinder (11) and the large cylinder (12).

A small piston (14) is mounted on the small cylinder (11) side and a large piston (15) is mounted on the large cylinder (12) side. A small piston side rod 16 is connected to the small piston 14 and a large piston side rod 17 is connected to the large piston 15 so as to transmit the power according to the operation to the tractor rear work machine connection portion.

2, the hydraulic pressure is transmitted to the small cylinder 11 at the time of contraction of the width control cylinder device of the tractor rear work machine connecting portion according to the present invention, so that the small piston 14 moves toward the cylinder center portion 13 ). At this time, the small piston 14 forms an oil pressure corresponding to the operating area of the small A side surface and transfers it to the cylinder central portion 13. The operating area of the small A side is determined by the cross sectional area of the small piston 14.

The fluid communication path from the small cylinder 11 to the large cylinder 12 is formed in the cylinder central portion 13 so that the hydraulic pressure formed by the small piston 14 is transmitted to the large cylinder 12, Press the B side. The operating area of the large-B surface is determined by an area obtained by subtracting the cross-sectional area of the rod 17 from the area of the large piston 15.

The rod 16 and the large piston 15 mounted on the small piston 14 have to be displaced to the same extent on the left and right sides of the connection link provided on the left and right sides of the width adjusting cylinder device of the tractor rear working machine connection portion, The rod 17 mounted on the rod must move to the same displacement at the time of contraction and at the time of expansion. For this purpose, the working area of the small A side and the working area of the large B side are set to be the same. The shrinkage displacement of the small piston 14 on the side of the small cylinder 11 to the cylinder center portion 13 by the hydraulic pressure supply and the shrinkage displacement of the large piston 15 on the side of the large cylinder 12 to the cylinder central portion 13 The displacement is controlled equally. The large B-side of the large piston (15) discharges the working fluid to the tank without receiving the hydraulic pressure.

3 is a view showing an expanded state of both rod cylinders in a width adjusting cylinder apparatus of a tractor rear work machine connecting portion according to the present invention.

3, when the width adjusting cylinder device of the tractor rear work machine connecting portion according to the present invention is extended, the hydraulic pressure is transmitted to the large cylinder 12, so that the large piston 15 is urged toward the direction away from the cylinder central portion 13 do. At this time, the large piston (15) forms an oil pressure corresponding to the operating area of the large B side and transfers it to the cylinder central portion (13). The operating area of the large B side is determined by the area obtained by subtracting the cross sectional area of the rod 17 from the area of the large piston 15 as described above.

The fluid communication path from the large cylinder 12 to the small cylinder 11 is formed in the cylinder center portion 13 so that the hydraulic pressure formed by the large piston 15 is transmitted to the small cylinder 11, Press the A side. The operating area of the small A side is determined by the cross sectional area of the small piston 14 as described above.

The rod 16 and the large piston 15 mounted on the small piston 14 have to be displaced to the same extent on the left and right sides of the connection link provided on the left and right sides of the width adjusting cylinder device of the tractor rear working machine connection portion, The rod 17 mounted on the rod must move to the same displacement at the time of contraction and at the time of expansion. For this purpose, the working area of the small A side and the working area of the large B side are set to be the same. The expansion displacement from the cylinder center portion 13 of the large piston 15 on the side of the large cylinder 12 due to the hydraulic pressure supply to the cylinder center portion 13 of the small piston 14 on the small cylinder 11 side ) Is controlled in the same manner. The small B-side of the small piston 14 discharges the working fluid to the tank without receiving the hydraulic pressure.

FIG. 4 is a view showing the maximum expansion state of both rod cylinders in the width adjusting cylinder apparatus of the tractor rear worker connecting portion according to the present invention.

2 and 3, the rod 16 mounted on the small piston 14 and the rod 17 mounted on the large piston 15 are controlled to contract and expand to the same displacement, The possibility of occurrence of internal leakage of the working fluid can not be excluded. In this case, the displacement of the rod 16 mounted on the small piston 14 and the rod 17 mounted on the large piston 15 can be changed. So that the displacements of the two rods 16 and 17 can be reset equally.

When the hydraulic pressure is supplied to the large cylinder 12 for the extended displacement, the large piston 15 gradually moves away from the cylinder central portion 13 so that the end of the rod cover 18 and the large-side surface of the large piston 15 abut do. As a result, the fluid communication path from the large cylinder 12 to the small cylinder 11 is clogged and the fluid communication between the two cylinders is interrupted.

In this state, when the hydraulic pressure is raised by raising the rotational speed (rpm) of the pump forming the hydraulic pressure, the hydraulic pressure applied to the through hole 19 formed at the center of the large- The ball 21 is pushed out, and the working fluid flows through the through-hole 19. The influent working fluid flows into the flow path B formed in the space between the rod cover 18 and the rod 17 through the flow path A formed in the rod 17. A through hole 22 is formed at the end of the rod cover 18 toward the flow path C for the communication between the flow path C and the flow path B which is the inlet of the flow path from the large cylinder 12 to the cylinder center portion 13. The working fluid introduced into the flow path B through the through hole 22 at the end of the rod cover 18 flows into the flow path C and then to the cylinder center portion 13 and is supplied to the small cylinder 11. [ The hydraulic pressure is supplied to the small cylinder 11 so that the operating displacement of the small piston 14 which is not in contact with the end of the rod cover 18 of the small cylinder 11 due to the above- The additional compression of the small piston 14 is carried out even if there is an inconsistency and finally the small piston 14 is brought into contact with the end of the rod cover 18 on the side of the small cylinder 11 to achieve displacement matching in both cylinders.

With respect to the displacement matching behavior in the displacement mismatch state in which the large piston 15 is in contact with the end of the rod cover 18 but the small piston 14 is not in contact with the end of the loader cover 18 It is apparent to those skilled in the art that the displacement matching behavior is operable by the same mechanism in the opposite case.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the scope of the present invention.

Accordingly, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all ranges that are equivalent to or equivalent to the claims of the present invention as well as the claims .

10: cylinder housing
11: Small cylinder
12: Large cylinder
13:
14: Small piston
15: Large piston
16: Small piston side rod
17: Large piston side load
18: Rod cover
19: Through-hole of piston
20: spring
21: Ball
22: Through-hole at the end of the rod cover

Claims (6)

delete delete delete A cylinder device for controlling a width of a tractor rear work machine connection portion formed by a pair of left and right,
A small cylinder (11) and a large cylinder (12) formed inside the cylinder housing (10) and operating at the same displacement,
The small cylinder (11) and the large cylinder (12) are in fluid communication with each other,
An overload valve is provided in each of the small piston 14 accommodated in the small cylinder 11 and the large piston 15 accommodated in the large cylinder 12,
The overload valve closes the through hole 19 of the piston by the load of the spring 20. When the working fluid is supplied at a pressure exceeding the load of the spring 20, the flow of the working fluid into the through hole 19 of the piston Lt; RTI ID = 0.0 >
The fluid communication between the small cylinder 11 and the large cylinder 12 is performed through the overload valve at a pressure larger than a normal operating fluid pressure so that the small piston side rod 16 and the large piston side rod 16, (17) are equally reset,
Cylinder device. 5. The method of claim 4,
The through hole 19 is formed in the piston face (small A-face) of the small piston 14 and the piston face (large face) of the large piston 15,
A groove 20 is formed in an end portion of the small piston side rod 16 and the large piston side rod 17 on the side of the cylinder center portion 13. The spring 20 is mounted on the groove, To the cylinder center portion (13) side to close the through hole (19)
When the hydraulic pressure applied at the time of the extended displacement exceeds the load of the spring 20, the closing of the through hole 19 by the ball 21 is stopped and the through hole 19, the groove and the rod 16, (17) and the working fluid (A)
Cylinder device. 6. The method of claim 5,
The working fluid that has passed through the flow path A closes the opposite end of the small cylinder 11 and the large cylinder 12 on the side opposite to the cylinder center portion 13 and is provided with a rod The flow path (flow path D) formed at the end of the rod cover 18 on the side of the cylinder central portion 13 flows into the flow path (flow path B) formed by the space between the cover 18 and the rods 16 and 17, And the working fluid is communicated,
Cylinder device.
KR1020160016171A 2016-02-12 2016-02-12 Width control cylinder device for rear work part connection of tractor KR101885309B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160016171A KR101885309B1 (en) 2016-02-12 2016-02-12 Width control cylinder device for rear work part connection of tractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160016171A KR101885309B1 (en) 2016-02-12 2016-02-12 Width control cylinder device for rear work part connection of tractor

Related Child Applications (1)

Application Number Title Priority Date Filing Date
KR1020180028653A Division KR20180030003A (en) 2018-03-12 2018-03-12 Width control cylinder device for rear work part connection of tractor

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KR20170094889A KR20170094889A (en) 2017-08-22
KR101885309B1 true KR101885309B1 (en) 2018-08-06

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3795095B2 (en) * 1994-09-08 2006-07-12 新明和工業株式会社 Hydraulic cylinder tuning device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200202324Y1 (en) * 1998-09-18 2000-12-01 김명수 An oil pressure valve apparatus of a cylinder for a harrow
KR101165238B1 (en) * 2008-08-12 2012-07-17 김명수 Oil pressure valve apparatus of cylinder for harrow
KR101532596B1 (en) * 2013-07-10 2015-07-01 대호 (주) A coupling device for installing working machine in tractor rear side

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3795095B2 (en) * 1994-09-08 2006-07-12 新明和工業株式会社 Hydraulic cylinder tuning device

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