JPS6244826Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission load control device that controls a load acting on a transmission.

Conventionally, as a drive device for various auxiliary equipment such as a pump for a power steering device or a compressor for a cooler, a transmission is installed on the output shaft of the engine, and various auxiliary equipment is connected to this transmission by belts to drive the engine. There are devices that rotate various auxiliary machines at a constant rotation speed regardless of changes in rotation speed.

In such a drive system, the load on the auxiliary equipment, such as the pump for the power steering system, varies greatly between normal operating conditions and when stationary, so the speed change is performed taking into account the maximum load of each auxiliary equipment. It was necessary to design the machine, and the disadvantage was that the transmission was large.

The present invention was developed to solve these conventional drawbacks, and its purpose is to stop the operation of the cooler compressor when the load on the power steering pump increases beyond a set value. To prevent an excessive load from acting on a transmission, and to enable the use of a small-sized transmission with a small allowable load torque.

Examples of the present invention will be described below. In the drawing, 10 is an automobile engine, and 11 is a transmission connected to the output shaft of this automobile engine 10. This transmission 11 has a built-in known transmission mechanism, and regardless of changes in the rotational speed of the automobile engine 10. figure,
The output pulley 13 is controlled to rotate at a constant speed. Various auxiliary machines, such as a power steering device pump 14, are connected to the output pulley 13 via a belt 15, and a power steering device 18 is connected to the pump 14 via oil passages 16 and 17. There is. A cooler compressor 19 is connected to the output pulley 13 via a belt 20 and an electromagnetic clutch 21. A switching circuit 23 communicating with a power source 22 is connected to the electromagnetic clutch 21, and by operating a cooler start switch 24 on this circuit 23, the electromagnetic clutch 21 is turned on and off.

The essential part of the present invention is that in the drive device for auxiliary equipment having the above-mentioned structure, a detector 25 for detecting the working fluid pressure of the power steering device 18 is provided in the oil passage 16, and this detector 25 is connected to the electromagnetic clutch 21. This is because it is connected to a switching circuit 23 that turns on and off.

In the above configuration, first, the cooler start switch 2
4, the electromagnetic clutch 21 is turned on, and the rotation of the engine 10 is thereby changed to the transmission 1.
1. It is transmitted to the cooler compressor 19 via the output pulley 13, belt 20 and electromagnetic clutch 21, and the cooler is started.

While the cooler is in operation, the operator presses the handle 26.
When the steering wheel is operated, fluid pressure corresponding to the steering resistance is generated in the oil passage 16. For example, if the automobile is traveling at high speed, the steering resistance is small, and therefore no large fluid pressure is generated in the oil passage 16. For this reason, the detector 25
is not operated, and the cooler compressor 19 is operated as it is.

However, when the car is stopped, the steering wheel 26
When the engine is stopped, a large steering resistance acts, and as a result, the fluid pressure in the oil passage 16 rises rapidly, and the load on the power steering device pump 14 increases. However, on the other hand, the increase in the fluid pressure in the oil passage 16 activates the detector 25, which disables the switching circuit 23, turns off the electromagnetic clutch 21, and stops the cooler compressor 19. Ru. Therefore, the increase in the load on the power steering pump 14 is offset by the stoppage of the cooler compressor 19, and the transmission 1
A sudden increase in the load on 1 is prevented.

As mentioned above, the present invention connects various auxiliary equipment such as the power steering pump and the cooler compressor to the output shaft of the automobile engine via a transmission that controls constant speed, so that the output shaft of the automobile engine can be easily controlled regardless of changes in engine speed. Since it is possible to drive various auxiliary machines such as a pump for a power steering device at a constant speed, and also to control a plurality of auxiliary machines at a constant speed with one transmission, it has the advantage of a simple configuration.

Further, the present invention provides a detector for detecting the working fluid pressure of the power steering device in the pump for the power steering device or in the fluid circuit of the power steering device operated by the fluid supplied from the pump. It is possible to detect the operation of the power steering device with a higher priority and control the cooler compressor, which has a lower priority, to be turned off, without making the driver feel a sudden change in steering feel. In addition, a sudden increase in transmission load can be prevented, so even a small transmission with a relatively small allowable load torque can be used satisfactorily, and there is no sudden increase in transmission torque.
It also has the advantage of improving the durability of the transmission.

[Brief explanation of the drawing]

The drawing is a control circuit diagram showing an embodiment of the present invention. 10...Automotive engine, 11...Transmission,
13... Pump for power steering device, 19... Compressor for cooler, 23... Switching circuit, 2
5...Detector.

Claims (1)

[Scope of utility model registration request] Various auxiliary equipment such as a pump for a power steering system and a compressor for a cooler are connected to the output shaft of an automobile engine via a transmission that controls constant speed. A switching circuit that turns on and off is connected, and a detector that opens when the working fluid pressure in the power steering device pump or the fluid circuit of this power steering device rises above a predetermined value is connected in this switching circuit. A transmission load control device characterized by the following: