JPH0626091Y2 - Structure of work device connecting part of work vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention connects a working device via left and right links mounted on the rear part of a machine body so as to be vertically swingable and horizontally swingable, and
The present invention relates to a work device connecting portion structure for a work vehicle, in which a restricting member that restricts the lateral swing of the link is installed between the outside of the link and the machine body.

[Conventional technology]

In such a work vehicle, when the work device is not attached to the road such as traveling on the road without connecting the work device to the machine body, the left and right links are laterally outward due to vibrations generated as the machine body travels. Since the left and right links come into contact with the rear wheels by swinging to the side, conventionally, when traveling with the work device not attached, a rubber band as a connecting member that connects the left and right links is wound. It was configured to turn.

[Problems to be solved by the invention]

According to the above configuration, when the work device is traveling without being mounted, the rubber band must be attached to the link, and when the work device is connected, the rubber band must be removed from the link. The operation of the rubber band when detaching the work device or connecting the work devices to run the device without the device is troublesome.

An object of the present invention is to eliminate the need to operate the rubber band associated with connecting and disconnecting the working device, and to quickly connect and disconnect the working device.

[Means for solving problems]

The characteristic structure of the present invention is that a dustproof cover for covering at least both lateral sides and an upper side of a power take-off shaft for the working device projecting to the rear part of the machine body is swingably attached to the machine body,
An elastic member that constantly urges the link to swing inward is provided between the dustproof cover and the inside of the link.

[Action]

In other words, by permanently installing an elastic member on the machine body that constantly urges the link to swing inward, the work device can be attached without removing the elastic member, and the work device can be run in a non-connected state. Even if the work device is removed to avoid the above problem, the elastic member always oscillates and urges the link to move inward, so the work device is not attached to the link without any operation. When the link is made, it is possible to surely avoid the link from swinging laterally outward.

Moreover, by disposing the elastic member between the dustproof cover and the link, even if the power transmission shaft that connects the power take-off shaft on the machine body side and the input shaft of the working device is tilted as the working device moves up and down, Since the dustproof cover can be vertically swung integrally with the link, the posture of the dustproof cover with respect to the power take-off shaft side end of the transmission shaft can be maintained in a predetermined posture regardless of whether the working device is raised or lowered. be able to.

[Effect of device]

Therefore, by permanently installing an elastic member on the machine body to prevent the link from swinging laterally outward, when the work device is traveling without being attached, it is only necessary to disconnect the work device. Well, when connecting the work device, the work device can be connected without removing the elastic member, so that the work device can be connected and disconnected by eliminating the need for an extra operation on the rubber band as in the conventional case. I can do it quickly.

Moreover, by providing the elastic member between the dustproof cover and the link, the distance between the upper wall or the lower wall of the dustproof cover and the end of the transmission shaft on the power take-off shaft side can be maintained regardless of whether the working device is moved up or down. Since it can always be kept constant, even when configuring the dustproof cover, the gap between the dustproof cover and the power take-off shaft in the vertical direction of the machine body can be configured in a smaller state as compared with the conventional one. The dustproof function can be further enhanced.

〔Example〕

As shown in FIG. 6, a pair of left and right lift arms (3), (3), which are vertically rocked by a single-acting hydraulic cylinder (2), and these lift arms ( 3) and (3) are provided with a three-point link mechanism (4) which is driven to swing up and down, and the three-point link mechanism (4) is provided with a rotary tiller (5).
Is detachably connected to form a riding type cultivator which is an example of a work vehicle.

As shown in FIGS. 1 and 6, the three-point link mechanism
(4) is a pair of left and right lower links (6), (which are attached to the rear part of the machine body (1) so as to be vertically swingable and horizontally swingable so as to connect the machine body (1) and the rotary tiller (5). 6) and a top link (9) connecting the top link support (7) attached to the rear upper side of the airframe (1) and the top mast (8) attached to the upper part of the rotary tiller (5). Configured. The lift arms (3), (3) and the lower links (6), (6) are connected by lift rods (10), (10), and the hydraulic cylinder (2) is expanded and contracted. The three-point link mechanism (4) is constructed so that it can be driven and rocked. The lift rod (1
As shown in FIG. 5, a rod portion (10A) connected to the lift arm (3) is slidably fitted on the rod portion (10A), and the lower link (6) is attached. ) Connected to the cylindrical portion (10B), the rod portion (10A) and the cylindrical portion (10B) through the through hole formed in the rod portion (10A) and the cylindrical portion (10B) relative sliding When connecting the rotary tiller (5) to the airframe (1), which comprises a lock member (10C) for preventing movement, one lower link (6) and the corresponding rotary tiller.
Even if the connecting position with (5) is different in the vertical direction, the lock member (10C) is locked against the rod portion (10A) against the biasing force of the spring (11) as shown by the chain double-dashed line. After releasing, connect the tubular part (10B) and the rod part (10A) to the rod part
By performing relative sliding operation within the range of the vertical groove (10a) formed in (10A), the connecting part of the lower link (6) and the connecting part of the rotary tiller (5) can be easily moved in the vertical direction. It is possible to match. Therefore, the lower link (6) and the rotary tiller (5) can be easily connected without tilting the relatively heavy working device in the left-right direction. After the lower link (6) is completely connected, the hydraulic cylinder (2) is expanded / contracted so that the tip of the lock member (10C) has the rod portion (10A) and the tubular portion (10B). ) To the lock state. In the figure, (12) is a locking frame attached to the support bracket (13) of the lock member (10C) to lock and hold the lock member (10C) in the unlocked state.

As shown in FIG. 1, the input shaft (14) of the rotary tiller (5) and the power take-off shaft projecting to the rear part of the machine body (1).
(15) and (15) are interlockingly connected via a transmission shaft (17) having a pair of bendable transmission joints (16) and (16), and are configured to drive a rotary tiller (5). is there.

A turnbuckle type restricting member (18), (18) for restricting lateral outward swing of the lower links (6), (6) is provided outside the lower links (6), (6). Installed between a pair of rear wheel transmission cases (19), (19) extending to the left and right at the rear of the machine body (1), the rotary tiller (5) swings to the left to the right. The restriction member (18) of the left side restricts the rotary tiller (5) from swinging to the right side.
It is configured to be regulated by 8).

The restriction of the lateral links of the lower links (6), (6) by the restriction members (18), (18) can be restricted only when the rotary tiller (5) is connected. Rotary cultivator
When the (5) is not connected, the tension springs (20), (2
(0) restricts the swinging of the lower links (6), (6) outward in the lateral direction.
The mounting structure of 0) and (20) will be described.

As shown in FIGS. 1 to 4, the power take-off shaft (15)
A dustproof cover (21) covering both lateral sides and the upper side of the fuselage (1) through the pivot pins (22) and (22) of the lower links (6) and (6).
Vertically swingably, so that the swing fulcrums of the lower links (6) and (6) on the machine side and the swing fulcrum of the dustproof cover (21) are on the same axis. Dust cover (21)
And the lower links (6), (6) and the inside of the lower links (6), (6) is provided with the tension springs (20), (20) for urging the lower links (6), (6) to swing inward at all times. Even when traveling with the rotary tiller (5) removed, the lower links (6), (6) are oscillated laterally outward by the action of the tension springs (20), (20). It is possible to regulate that, the dust-proof cover (21) swings up and down integrally with the lower links (6), (6), regardless of whether the rotary tiller (5) is raised or lowered, The dustproof cover (21) can be maintained in a predetermined posture with respect to an end portion of the transmission shaft (17) on the power take-out shaft side. In addition, as shown in the figure (2
3) is a cover for covering the transmission shaft (17).

[Another embodiment]

In the above embodiment, the tension spring (2
Although 0) and (20) are used, elastic rubber or the like may be used.

Further, in the above-mentioned embodiment, the dustproof cover (21) is provided with the power take-off shaft.
Although it is configured to cover both lateral sides and the upper side of (15), it may be configured to cover the lower side in addition to this.

Further, in the above embodiment, the swing fulcrum of the lower link (6) and the swing fulcrum of the dustproof cover (21) are provided on the same axis.
These two fulcrums may be different.

INDUSTRIAL APPLICABILITY The present invention can be applied not only to a riding-type cultivator but also to a work vehicle equipped with various working devices such as a rice transplanter equipped with a seedling planting device. In this case, the link mechanism for connecting the work device to the machine body may be a two-point link mechanism in addition to the three-point link mechanism (4).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

1 is a plan view of a rear portion of a riding-type cultivator partially cut away, and FIGS. 2 to 4 are illustrations of mounting a dustproof cover. FIG. 5 is a partially cutaway side view showing the structure of the lift rod, and FIG. 5 is a partially cutaway side view of the rear part of the riding type cultivator. (5) …… Working device, (6) …… Link, (18) …… Regulator,
(20) …… Elastic member, (21) …… Dustproof cover.

Claims (3)

[Scope of utility model registration request] 1. A working device (5) is connected via left and right links (6), (6) attached to the rear part of a machine body so as to be vertically swingable and horizontally swingable, and the links (6), ( A working device for a work vehicle in which restriction members (18), (18) for restricting lateral outward swinging of (6) are mounted between the outside of the links (6), (6) and the machine body. A dustproof cover (21) that is a connecting portion structure and covers at least both lateral sides and the upper side of the power take-off shaft (15) for the working device (5) protruding to the rear part of the machine body is swingable up and down on the machine body. Installation, the dust cover (21) and the link
Work of a work vehicle provided with elastic members (20), (20) for constantly swinging and biasing the links (6), (6) inwardly between (6) and (6) Device connection structure. 2. A utility model registration request wherein the swing fulcrum of the links (6), (6) on the machine side and the swing fulcrum of the dustproof cover (21) are provided on the same axis. The working device connecting portion structure of the work vehicle according to item 1 above. 3. The work device connecting portion structure for a work vehicle according to claim 1, wherein the elastic members (20), (20) are tension springs.