JPH0314967Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention consists of a pair of left and right swinging links and a drive lifting arm that lifts and lowers these links.
The working device is configured to be connected so as to be freely raised and lowered by a point type link mechanism, and a link mounting member that pivotally supports the pair of links is externally fitted concentrically to a power take-off shaft oriented in the longitudinal direction of the machine body. The present invention relates to the structure of a link mechanism connecting portion in a tractor that is rotatably fitted and connected to a cylindrical member connected to a traveling body.

[Conventional technology]

In order to make the left and right plowing depths the same regardless of the left and right inclination of the traveling body, the above tractor has
The connecting device is configured to be able to perform rolling operations against the traveling aircraft by rotating the link attachment member.

Conventionally, in this type of tractor, there has been one that aims at smoother rotation of the link attachment member, as disclosed in, for example, Japanese Patent Application Laid-open No. 74707/1983. That is, a ball bearing is interposed between the cylindrical portion of the link attachment member for connection to the cylindrical member and the cylindrical member.

[Problem that the invention attempts to solve]

In the conventional case, not only are ball bearings required, but the bearings must be placed where the diameter is relatively large because the cylindrical portion and the cylindrical member are arranged concentrically with the power take-off shaft. Therefore, it is necessary to increase the diameter of the bearing, and it is also necessary to increase the size of the cylindrical portion or the cylindrical member, which not only increases costs but also has the disadvantage of increasing the size of the connection structure.

An object of the present invention is to provide a connection structure that allows the link mounting member to rotate smoothly, yet is economically advantageous and compact.

[Means for solving problems]

The feature of the present invention is that in the structure of the link mechanism connection part in the tractor mentioned above,
A connecting cylindrical part of the link attachment member to the cylindrical member is directly connected to the cylindrical member, and a pair of oil seals is installed between the cylindrical part and the cylindrical member at the front end of the cylindrical part. The oil reservoir is provided so as to be distributed between the side and rear end sides, and the oil reservoir is provided between the pair of seals, and its functions and effects are as follows.

[Effect]

By providing an oil reservoir and a pair of oil seals, even if the cylindrical part and the cylindrical member come into direct contact, the oil in the oil reservoir will provide lubrication and the oil seal will prevent oil leakage. By preventing breakage, the link mounting member can rotate smoothly.

[Effect of idea]

The link attachment member can be rotated smoothly, and the rolling adjustment of the connecting work device can be smoothly performed with a light operating force. Despite that,
In addition to eliminating the need for bearings to ensure smooth rotation of the link mounting member, the diameter of the cylindrical portion or cylindrical member is made as small as possible to reduce costs, and the connection structure is compact and easy to install. Summer.

〔Example〕

As shown in FIG. 1, a rotary tilling device 2 is connected to the rear part of a body 1 of a wheeled tractor via a link mechanism 3 so as to be able to be driven up and down, and is provided in a state that protrudes rearward from the tractor body 1. A tiller is constructed by interlocking a power take-off shaft 4 in a longitudinal direction with a tiller 2 via a transmission shaft 5 with a universal joint.

The link mechanism 3 includes a pair of left and right links 3A and 3A' that are fixedly connected to the tilling device 2 and are attached to a link attachment member 6 that is connected to the tractor body 1 so as to be able to swing vertically around a horizontal axis. , is attached to the tractor body 1 so as to be integrally driven and oscillated in the vertical direction by a hydraulic cylinder 3D, and the links 3A and 3A' are connected to each other via lift rods 3B and 3B' at the free end. A pair of left and right drive lift arms 3C, 3C' are interlocked and connected to the drive lift arms 3C, 3C', and the vertical swing of the drive lift arms 3C, 3C' causes the links 3A, 3A' to swing up and down.
The tilling device 2 is configured as a two-point system to move up and down.

As shown in FIGS. 2 and 3, in the link mounting member 6, a pair of pivot connecting portions 6a, 6a' that separately pivot the pair of links 3A, 3A' connect the power take-off shaft 4. A state in which the power take-off shaft 4 is externally fitted concentrically to the rear of the machine frame, which is constituted by the tiller-side link attachment members 7, which are provided to face each other, and the transmission case of the tractor body 1. and a pair of left and right mounting portions 6.
The body side cylindrical member 6B is connected and fixed to the body frame with bolts at C and 6C'. Then, the cylindrical portion 6A is replaced with the cylindrical member 6B.
The forward end surface of the cylindrical portion 6A and the mounting portion 6 are fitted in a state in which they are in direct contact with each other and are rotatably fitted.
Due to the contact with C, the cylindrical member 6B of the cylindrical portion 6A
A collar 18 is configured to prevent movement toward the front of the fuselage, and is connected to the end surface of the cylindrical member 6B facing toward the rear of the fuselage with a plurality of bolts 19.
The link attachment member 7 is rotated to the cylindrical member 6B so that the cylindrical portion 6A is prevented from coming off from the cylindrical member 8 by contact with the end surface of the cylindrical portion 6A facing the rear of the fuselage body. They are connected for free movement. Then, one 3B of the pair of lift rods 3B, 3B' is
It is composed of a hydraulic cylinder so that it can be expanded, contracted, and fixed, and the connected posture of the tilling device 2 when viewed in the longitudinal direction of the machine is adjusted in order to maintain almost the same plowing depth on the left and right sides regardless of whether the tractor is tilted left or right. By rotating the first link attachment member 7 using the lift rod cylinder 3B around the axis X that is the same or almost the same as the power take-off shaft 4, the tilling device 2 can be attached to the tractor body. 1 can be rolled.

As shown in FIG. 3, a pair of O-ring type oil seals 21, 21' are arranged between the cylindrical portion 6A and the cylindrical member 6B, and are divided into the front end side and the rear end side of the cylindrical portion 6A. the oil reservoir 9 is disposed between the pair of oil seals 21, 21' and communicated with the nipple 20 so that grease can be injected from now on;
The lubrication effect of the grease in the oil reservoir 9 and the oil seals 21 and 21' prevent grease from leaking and running out of grease, making it possible to smoothly rotate the link mounting member 7 over a long period of time. It is structured as follows.

Incidentally, reference numeral 16 shown in FIG. 1 is an operating lever for the lift rod hydraulic cylinder 3B.

[Brief explanation of the drawing]

The drawings show an embodiment of the structure of the link mechanism connection part in a tractor according to the present invention, in which Figure 1 is a side view of the rear part of the tiller, Figure 2 is a rear view of the link mechanism connection part, and Figure 3 is the link mechanism connection. It is a partially cutaway side view of the section. 1... Traveling machine body, 2... Working device, 3... Two-point link mechanism, 3A, 3A'... Swinging link, 3
C, 3C'... Drive lifting arm, 4... Power take-off shaft, 6A... Cylindrical part, 6B... Cylindrical member, 7...
Link mounting member, 9...Oil reservoir portion, 21, 21'
……Oil seal.

Claims (1)

[Scope of utility model registration request] A two-point linkage mechanism 3 consisting of a pair of left and right swing links 3A, 3A' and drive lifting arms 3C, 3C' for lifting and lowering these links 3A, 3A' connects the working device 2 in a manner that allows it to move up and down. A cylinder is connected to the traveling body 1 in such a manner that the link attachment member 7 that pivotally supports the pair of links 3A and 3A' is externally fitted concentrically to the power take-off shaft 4 oriented in the longitudinal direction of the body. This is a structure of a link mechanism connecting portion in a tractor that is rotatably fitted and connected to a shaped member 6B, and includes a connecting cylindrical portion 6A of the link attachment member 7 to the cylindrical member 6B, and the cylindrical member 6B. between the cylindrical portion 6A and the cylindrical member 6B, a pair of oil seals 21,
21' are arranged separately on the front end side and the rear end side of the cylindrical part 6A, and the oil reservoir part 9
A structure of a link mechanism connecting portion in a tractor, in which a link mechanism is disposed between a pair of seals 21 and 21'.