JPS6026572Y2 - tractor - Google Patents

Description

[Detailed description of the invention] This invention is based on a state in which bars for attaching the work equipment towing coupler to both ends are supported in a state in which they face in the left-right direction of the machine and can be elastically deformed at two locations on the left and right sides. The present invention also relates to a tractor provided with a device for detecting a tractive load of the working device based on a displacement detected by horizontal bending deformation of the central portion of the bar.

The bar supports the working device via a coupling device, and is deformed when a load is applied to the bar not only in the pulling direction but also in the vertical direction.As a result, conventionally,
There is a problem that the bar becomes distorted and the detection accuracy of the tractive load is reduced. In addition, especially when using a round bar, the vertical deflection causes a gap between the bar and the sensor of the working device. There was a problem in that the contact point was shifted in the circumferential direction of the bar, and the amount of deformation of the bar in the pulling direction could not be detected correctly, resulting in a significant drop in detection accuracy.

In view of the above points, it is an object of the present invention to suppress vertical bending deformation of a bar due to support of a working device, and to enable accurate detection of traction load over a long period of time.

Next, embodiments of the present invention will be described in detail based on the drawings.

A pair of left and right lift arms 6.6 are connected to the rear of the tractor 1 via a pair of left and right connectors 2, 2 and a top link 3, and are provided on the tractor 1 to be driven and swingable via a hydraulic cylinder 5. and the connecting tools 2, 2 are connected via a connecting rod 7.7, and the plow 4 is raised and lowered from the ground, thereby allowing agricultural work to be carried out to dig up the field as it travels. I'm afraid of the car.

A transmission case 9 provided at the rear of the tractor 1 is connected to the transmission case 9, and a bar 10 is supported by the case 9 so as to face the transverse direction of the machine and to be elastically deformable at two positions on the left and right sides thereof. A connecting member 2.2 is installed at each end of the bar 10 so that the bar 10 is bent and deformed under the pulling load of the plow 4.

The sensor 11 is placed near the center of the bar 10 on the main body 12.
A detection device 13 is installed on the body so as to be slidable in the longitudinal direction of the fuselage and configured to read the changed position by voltage changes.
The sensor 11 is provided in a biased state so as to be in constant contact with the central portion of the bar 10, and the detection device 1
3 is connected to the control valve of the hydraulic cylinder 5, and the tractive load of the plow 4 is detected by the detection device 13.
The hydraulic cylinder 5 is automatically activated to raise and lower the plow 4 based on the detected load, which is detected based on the amount of displacement caused by the deflection deformation of The system is designed to maintain the traction load within the set range.

As shown in FIG. 2 and FIG.
The sensor 11 of the detection device 13 can be freely slid through the partition wall 14 and brought into contact with the center of the bar 10. It should be kept energized at all times.

□A predetermined location on the peripheral wall 15 forming the par storage space S,
above and below the center of the bar 10, and the sensor 1
Stoppers 16 are provided at three locations on opposite sides of the bar 10 with the bar 10 in between to prevent bending deformation of the bar 10 in the vertical direction as it is supported by the plow 4, as well as suspension when the plow 4 is lifted. It is designed to prevent any bending deformation in the direction away from the sensor 11 due to the downward load.

Each of the stoppers 16 is constructed with a bolt, and among them, the stopper 16 that prevents upward deflection of the bar 10 is constructed with a headless bolt, screwed into the peripheral wall 15, and attached to the transmission of the case 9. This arrangement is made so as not to interfere with the attachment to the case 8.

In addition, in the present invention, during towing work and when lifting the plow 4, due to the biting force of the plow 4 and the weight of the plow 4, both ends of the bar 10 are An upward bending stress is applied to the bar 10, and as a result, the central portion of the bar 10 is deflected downward, and focusing on the fact that the amount of displacement is extremely large compared to that in the other two directions, the downward bending of the bar 10 is Only the stopper 16 for preventing deformation may be provided, or the stopper 16 may be provided in both the upper and lower directions, or the stopper 16 may be provided in at least one of the upper and lower directions.

Further, the present invention is applicable not only to the case where the plow 4 is used but also to the case where various working devices 4 such as a tilling device are used.

As shown in the embodiments above, the feature of the present invention is that the bar 10 for attaching the work device 4 towing couplers 2, 2 to both ends is oriented in the left-right direction of the machine, and A device 13 is provided in a state in which the bar 10 is supported in a deformable manner by elastic deflection at two locations, and detects the traction load of the working device 4 based on the displacement detected by the deflection deformation in the horizontal direction of the central portion of the bar 10. In the provided tractor, the bar 1 is located near the device 13 for detecting the traction load.
1. A stopper 1 that abuts at least one of the upper and lower sides of the bar 10 at the center to limit displacement of the bar 10 in the vertical direction.
6, and this configuration provides the following effects.

In other words, the bending deformation of the bar 10 in at least one of the vertical directions due to the support of the working device 4 is limited: Therefore, bending deformation other than the pinching deformation necessary for the traction load is suppressed as much as possible, and the bar 10 is In addition, even if a round bar is used as the bar 10, the contact point between the bar 10 and the sensor 11 due to vertical bending deformation can be suppressed. As a result, the traction load can be detected with high accuracy over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the tractor according to the present invention, in which Fig. 1 is an overall side view showing a state in which a plow is attached, Fig. 2 is a partially cutaway side view of the main part, and Fig. 3 is a part of the main part. FIG. 2... Connector, 4... Working device, 10
...Bar 11...Sensor, 13...
...detection device, 16...stopper.

Claims (1)

[Scope of utility model registration request] A bar 10 for attaching the towing couplers 2, 2 of the working device 4 to both ends is provided in a state facing the left and right direction of the machine body and supported elastically and deformably at two places on the left and right, and the bar 10 The tractor is provided with a device 13 for detecting the traction load of the working device 4 based on the displacement detected by the horizontal deflection deformation of the central portion of the tractor 10, the tractor being located near the device 13 for detecting the traction load. A tractor characterized by being provided with a stopper 16 that comes into contact with at least one of the upper and lower sides of the central portion of the bar 10 to limit displacement of the bar 10 in the vertical direction.