JPS61286654A - Backward speed controlling device for vehicle - Google Patents

Abstract

PURPOSE:To obtain direct restriction of a backward speed of a vehicle by providing a discharging pipe of a pump, which is driven when the vehicle goes backward, with a governor valve equipment, which regulates the fluid pressure so as to meet the vehicle speed, and making a wheel braking device operate in accordance with the said pressure. CONSTITUTION:A pump driving gear 10, which is engaged with a speed-reducing gear wheel 6 of a differential gear mechanism 2, drives a pump 12 via a pump driving shaft 11. The internal pressure of a discharge pipe 16 of the pump 12 is kept at a preset line-pressure by means of a pressure regulating valve 17, while the end of this discharge pipe 16 is connected to a governor-valve device 19. A cylinder 20 of the governor-valve device 19 is connected to a differential gear box 3 of the differential gear device 2 via a revolving shaft 21 perpendicular to the axis of the cylinder 20, and the governor-valve device 19 outputs the pressure, which meets the vehicle speed, to a control pipe 26. The control pipe 26 is connected to a cylinder device 29, which is provided with a piston of a brake-master-cylinder 31, so that it can apply braking force to a wheel 1.

Description

[Detailed description of the invention]

U upper side upper plate 11 The present invention provides reverse speed control 1 for automatically controlling the reverse speed so that it does not exceed a certain speed in a vehicle such as an automobile.
Regarding one device.

[For vehicles equipped with a reversing mechanism, such as a car or a three-wheel vehicle, the driver turns his head to the rear when reversing and backs up while checking what's behind him, so the reversing speed is fast. Considering the ease of driving when reversing, it is desirable to prevent the reversing speed from exceeding a certain value. For this reason, conventionally, a three-wheeled motor vehicle with a reverse mechanism is provided with a vehicle speed limiting device that is activated by detecting a reverse operation, and the device limits the reverse vehicle speed to a predetermined value or less. No. (JP-A-59-155545
(No.). The vehicle speed limiting device includes a vehicle speed detection circuit that detects vehicle speed, a reverse detection circuit that detects reverse operation, and a discrimination circuit that discriminates signals from both detection circuits and generates an output signal when the vehicle speed exceeds a predetermined vehicle speed during reverse operation. and an ignition stop circuit that stops driving the engine's ignition device based on the output signal from the discrimination circuit. Also, the vehicle speed is limited to a predetermined vehicle speed or higher. - 11 The present invention provides various electronic circuits like the above-mentioned conventional device,
Rather than limiting the vehicle speed by controlling the engine or the like via signals from these circuits, the present invention is intended to more directly and effectively limit the vehicle speed to a predetermined value or less. TI -'' A governor valve device that is connected to the discharge pipe of the pump and sends the fluid in the discharge pipe to the brake pipe at a pressure corresponding to the vehicle speed, and a wheel brake device that is connected to the control pipe and operates according to the fluid pressure in the control pipe. According to the present invention, when the vehicle moves backward, the pump is driven via the rotating member to send fluid into the discharge pipe.This fluid is controlled via the governor valve device. The governor valve device itself is a well-known device used in automobiles, etc. It rotates according to the vehicle speed, and the centrifugal force acting on the centrifugal weight moves the valve body to rotate the pressure in the control pipe. Therefore, the fluid in the control pipe regulated in this way is sent to the cylinder device and pressurizes the piston of the device. When the vehicle speed exceeds a certain value, it operates and activates the wheel braking device connected to the piston.Thus, when the vehicle speed exceeds a certain value, the wheels are controlled, and the reverse speed does not increase above the certain value, so when going backwards, The burden on the driver is greatly reduced.Also,
Due to the adjusting action of the governor valve device, a braking force corresponding to the vehicle speed is applied, so that a smooth speed control operation can be obtained. 1''Ll The present invention will be explained below with reference to illustrated embodiments. The drawing is a schematic diagram showing the entire reverse speed control device according to the present invention. In this embodiment, a differential gear device is selected as the rotating member to which the pump is connected, but the pump may of course be connected to any other suitable rotating member. 1.1 is the left and right wheels. These wheels 1, 1 may be the rear wheels or front wheels of a normal automobile, or may be a pair of left and right wheels of a three-wheeled motor vehicle. Reference numeral 2 denotes a differential gear device, which is composed of a differential gear box 3, a small differential gear 4, and a large differential gear 5. A large reduction gear 6 coupled to the differential gear box 3 is provided on a propulsion shaft 8. It meshes with the reduction gear 7. The differential large gear 5 is connected to the wheels 1 via an axle 9, and the rotation of the propulsion shaft 8 is transmitted via the differential gear device 2 to the width of both vehicles 1.1. A pump drive gear 10 is also meshed with the reduction large gear 6, and the gear 10 is connected to a pump 12 via a pump drive shaft 11.
is connected to the rotor of A one-way clutch 13 is inserted in the middle of the pump drive shaft 11, and this one-way clutch 13 is released when the pump drive gear 10 rotates in the forward direction as shown by arrow a in the figure. Transmission of rotation is cut off, and when the wheel 1 rotates in the backward direction as shown by the arrow, it engages and pump drive gear 1
0 rotation is transmitted to the pump 12 via the pump drive shaft 11. Therefore, the pump 12 operates only when the vehicle is traveling in reverse. The pump 12 is a rotary pump such as a trochoid pump or a gear pump, and the rotor is rotated by the pump drive @11.The pump 12 sucks oil from the reservoir tank 14 through the suction pipe 15 and discharges it to the discharge pipe 1G. do. The internal pressure of the discharge pipe 16 is maintained at a constant line pressure by a pressure regulating valve 17. That is, a branch pipe 16a branched from the discharge pipe 16 is connected to the inlet of a pressure regulating valve 17, and the outlet of the pressure regulating valve 17 is connected to the reservoir tank 1 via a return pipe 18.
Connected to 4. A spring 17a is installed inside the pressure regulating valve 17.
A movable valve body 17b is provided which is biased by the pressure, and the line pressure of the discharge pipe 16 is applied to the end face of the sliding valve body 17b against the spring 17a. Therefore, the driving valve body 17
b moves in response to fluctuations in the discharge piping line pressure to open the inlet and maintain the line pressure constant. The end of the discharge pipe 16 is connected to a governor valve device 19. This governor valve device 19, as shown in the figure,
A cylinder 20 is rotatably supported via a rotation shaft 21 perpendicular to its axis, and the rotation shaft 21 is connected to the differential gear box 3 of the differential gear device 2 via a gear 22. The rotating speed of the moving gear box 3 corresponds to the speed of the vehicle. A centrifugal weight 23 and a valve body 24 directly connected to the centrifugal weight 23 are slidably fitted in the cylinder 20.
When the cylinder 20 rotates, the centrifugal weight 23 moves outward against the spring 25 due to centrifugal force, and the valve body 24 also moves along with this. In the vicinity of the valve body 24 of the cylinder 20, there is a discharge port 16a connected to the discharge pipe 16;
A control port 26a connected to the control pipe 26 and a discharge pipe 21
The discharge port 27a connected to is open, and the movement of the valve body 24 opens and opens each of these openings 16a, 26a, and 27a as appropriate, and the centrifugal force of the centrifugal weight 23, the force of the spring 25, The pressure within the valve chamber 28 is balanced. Therefore, the pressure in the valve chamber 28, that is, the pressure in the control pipe 26, has a value that corresponds to the rotational speed of the cylinder 20, that is, a value that corresponds to the vehicle speed, and this pressure is transmitted to the cylinder device 29 through the control pipe 2G. The piston 3G of the cylinder assembly rlI29 is connected to the piston of the brake 7 star cylinder 31 as shown in the figure, and as the piston 30 moves to the right in the figure, hydraulic pressure is generated in the brake mask cylinder 31, and the hydraulic pressure is The water is sent through the brake pipe 32 to a brake member attached to the wheel 1, such as a brake caliper (not shown), and the wheel 1 is braked. The screw 1-30 is biased to the left in the figure by a return spring built into the brake mask cylinder 31, and starts operating when the pressure in the control pipe 26 reaches a predetermined value or higher. The piston of the brake mask cylinder 31 is pushed in with the corresponding force. In this way, according to this embodiment, when the vehicle speed exceeds a certain speed when the vehicle is traveling backwards, the wheels are braked and the vehicle speed is automatically limited to a certain speed or less, thereby reducing the burden on the driver. Furthermore, since the wheels are braked with a force that corresponds to the vehicle speed, smooth speed control operation can be achieved. Although the present invention has been described above with reference to a preferred embodiment, the present invention is not limited to the above-mentioned embodiment, and many modifications may be made within the scope of the present invention, such as the structure of the governor pulp device. Needless to say. As described above, the reverse speed control device according to the present invention includes a pump connected to a rotating member that rotates as the vehicle moves forward or backward so as to be driven by the rotating member when the vehicle moves backward; A governor pulp device is connected to the discharge pipe and sends the fluid in the discharge pipe to the brake pipe at a pressure corresponding to the vehicle speed, and a governor pulp device is connected to the control pipe and operates according to the fluid pressure in the control pipe to operate the wheel braking device. Since it consists of a cylinder device that makes it possible to control the vehicle speed when reversing automatically and smoothly to a certain speed or less without using a complicated control circuit, it is possible to more directly control the vehicle speed when reversing to a certain speed The burden on the driver is reduced.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing the entire reverse speed control device according to the present invention. DESCRIPTION OF SYMBOLS 1...Wheel, 2...Differential gear device, 3...Differential gear box, 4...Differential small vj4Tr1.5...Differential large gear, 6...Reduction large gear, 7...Reduction pinion gear, 8...
・Propulsion shaft, 9... Φ axis, 10... pump drive gear,
11...Pump drive shaft, 12...Pump, 13...
・One-way clutch, 14...Reservoir tank, 1
5... Suction pipe, 16... Discharge pipe, 17... Pressure regulating valve, 18... Return pipe, 19... Governor pulp device,
2o... Cylinder, 21... Rotating shaft, 22... Gear, 23... Centrifugal weight, 24... Valve body, 25...
... Spring, 26... Control piping, 27 River discharge pipe, 28.
... Valve chamber, 29... Cylinder device, 30... Piston, 31... Brake mask cylinder, 32... Brake piping.

Claims (1)

[Claims] A pump connected to a rotating member that rotates as the vehicle moves forward or backward so as to be driven by the rotating member when moving backward, and a pump that is connected to a discharge pipe of the pump to supply fluid in the discharge pipe at a pressure that corresponds to the vehicle speed. A forward speed control device for a vehicle, which comprises a governor valve device that sends out data to a brake pipe, and a cylinder device that is connected to the control pipe and operates according to fluid pressure in the control pipe to operate a wheel brake device.