JPS6235704Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a two-engine motor scraper consisting of a front vehicle and a rear vehicle connected via an articulating device, each of which is equipped with an engine.

In this type of motor scraper, at least the rear vehicle of each vehicle is driven via a torque converter, but the front and rear vehicles are linked from the driver's seat using a single shift control device. Power transmission to the rear vehicle of the shift-controlled two-engine motor scraper was driven by a torque converter, which resulted in poor driving performance and fuel efficiency. Furthermore, if both the front and rear wheels are driven directly, the rotational speed of the front wheels (driving wheels of the front vehicle) and the rear wheels (driving wheels of the rear vehicle) will be significantly different during a turn, causing the problem that the engine on the rear vehicle side will stop.

The present invention was developed in view of the above, and in the above-mentioned two-engine motor scraper,
When the turning angle is below a certain angle, the power transmission between the front and rear vehicles is directly driven, and the rear vehicle is driven by a torque converter only when the turning angle is above a certain degree, improving driving performance and fuel efficiency. To provide a two-engine motor scraper which prevents excessive load from being applied to the engine of a rear vehicle when turning.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is a torque converter mounted on the rear vehicle, and 2 is a lock-up clutch that is operated by the hydraulic pressure of this converter. A hydraulic chamber 3 of the lock-up clutch 2 is connected to a hydraulic power source via an electromagnetic switching valve 4. The electromagnetic operating part 4a of the electromagnetic switching valve 4 is turned on by the limit switch 5 and the driver's cab.
A lockup signal changeover switch 6, which is turned off, is connected in series with a power source 7. Reference numeral 8 indicates a steering control linkage connected to the steering handle, and reference numeral 9 indicates a cam connected to this, and the dog of the limit switch 5 is in contact with this cam 9. The relationship between this cam 9 and the limit switch 5 is such that when the turning angle exceeds a certain angle by operating the handle, the dog of the limit switch 5 is removed from the cam 9 in the cam posture, and the limit switch 5 is turned OFF. In the cam posture when , the dog of limit switch 5 comes into contact with cam 9 and turns ON. The electromagnetic switching valve 4 is in the disconnected position when the limit switch 5 is OFF, and is in the open position when the limit switch 5 is ON.

However, while driving the front and rear vehicles, if the turning angle is less than a certain angle, the limit switch 5 is turned on and the electromagnetic switching valve 4 is in the communicating position, and the torque converter 1 of the rear vehicle is turned on. The lock-up clutch 2 is actuated, and the torque converter 1 is locked up and becomes direct drive.

On the other hand, when the turning angle exceeds a certain angle, the limit switch 5 is turned OFF, the electromagnetic switching valve 4 is in the disconnected position, the lock-up clutch 2 of the torque converter 1 of the rear vehicle is released, and the torque converter 1 of the rear vehicle is released. Performs fluid transmission function.

Note that while the vehicle is traveling, the lock-up signal changeover switch 6 provided in the driver's seat is turned on.

The present invention is as described above, and includes a two-engine motor scraper in which a front vehicle and a rear vehicle are connected via an articulation device, and each is equipped with an engine, and at least the rear vehicle is equipped with a torque converter 1. A lock-up clutch 2 is provided on a torque converter 1 mounted on the rear vehicle, and the switching mechanism of the lock-up clutch 2 is connected to a turning angle sensing mechanism such as a steering control linkage 8, a cam 9, and a limit switch 5. When the turning angle of the vehicle is below a certain angle, the lock-up clutch 2 is actuated to directly drive the torque converter 1 on the rear vehicle side. in some cases,
Along with the front vehicle, the rear vehicle is also directly driven.
The driving performance and fuel efficiency of the entire vehicle can be improved. Furthermore, when the vehicle turns over a certain angle, such as when changing direction, the lock-up clutch 2 of the torque converter 1 of the rear vehicle is turned OFF, resulting in normal fluid transmission, and no unreasonable load is applied to the rear engine.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. 1 is the torque converter, 2 is the lockup clutch, 5 is the limit switch, 8 is the steering control linkage, and 9 is the cam.

Claims (1)

[Scope of utility model registration request] In a two-engine motor scraper in which a front vehicle and a rear vehicle are connected via an articulation device, an engine is mounted on each, and a torque converter 1 is mounted on at least the rear vehicle, the torque converter 1 mounted on the rear vehicle is connected to the front vehicle and the rear vehicle. A lock-up clutch 2 is provided, and this lock-up clutch 2
A two-engine motor scraper characterized in that the switching mechanism is connected to a turning angle sensing mechanism constituted by a steering control linkage 8, a cam 9, and a limit switch 5.