JPS6018838B2 - Power steering pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power steering pump device that supplies fluid to a power steering system that assists manual steering torque.

Conventionally, there have been drawbacks such as a large power loss in the engine because the power steering pump is rotated at high speed even though almost no power is required when the vehicle is running at high speed.

The present invention solves the above-mentioned drawbacks, and one embodiment will be described below with reference to the drawings.

Reference numeral 1 denotes a pump body in which two members are integrally connected by bolts or the like, and an internal gear 2 having internal teeth and an external gear 3 having external teeth meshing with the internal teeth are rotated into the pump body 1. A rotating shaft 4 is pivotally attached to the external gear 3, and a crescent-shaped partition plate 5 is attached to the pump body 1, in which the tips of the teeth of both gears 2 and 3 are tightly extracted in the air space facing the meshing part. The pump body 1 and the gears 2 and 3 are fixed to each other to constitute an internal gear type pump that sucks fluid through a passage 6 and discharges it from a passage 7 by relative rotation of the pump body 1 and gears 2 and 3.

Reference numeral 8 denotes a device base integrally connected by bolts, which houses the pump body 1 therein, supports rotation shafts IA and IB protruding from the pump body 1, and communicates with the passages 6 and 7, respectively. It has an inlet 9 and an outlet 10.

Reference numeral 11 denotes a one-way clutch interposed between the rotation shaft IB and the rotation shaft 12, the device base 8 is fixed to the vehicle body of the automobile to restrict rotation, and the rotation shaft protrudes oppositely from the device base 8. One side 4 is connected to the engine side, and the other side IB is connected to the wheel side by a rotating shaft 12 with a one-way clutch 11 interposed therebetween.

Next, the operation will be explained.

When stopped, the rotation shaft 4 rotates in the direction A, and the rotation shaft IB, 12
Since the pump is stopped, a discharge amount corresponding to the speed of the rotating shaft 4 is discharged from the discharge port 10 and supplied to the power steering.
When traveling forward, the gear 2 changes depending on the speed of the rotating shaft 4 on the engine side.
, 3 reduce the discharge amount because the pump body 1 rotates in the direction A depending on the speed of the rotation shafts IB, 12 on the wheel side, and the discharge amount is determined according to the rotation difference between the rotation shafts 4 and IB, 12. Discharge port 1
It is discharged from 0 and supplied to the power steering.

Further, when the rotating shaft 12 rotates at a higher speed than the rotating shaft 4, the one-way clutch 11 intervenes so that the rotating ball 4 and IB rotate at the same speed, making the discharge amount zero. Rotating ball I on the wheel side when driving backwards
B and 12 are reversed and the relative rotation is accelerated, but the reverse movement is relatively slow and does not pose a problem.

It is also possible to add a cut-prevention mechanism so that the rotating wheels IB, 12 on the wheel side rotate in the same manner as when traveling forward when traveling backward.

Further, the rotation shaft 4 on the engine side is connected to the input shaft of the transmission, and the rotation shaft 12 on the wheel side is connected to the output shaft of the transmission. It is also possible to make the rotational speed the same as that of the engine, thereby reducing the discharge amount to zero, thereby reducing the power loss in the high speed gear to almost zero, and also improving the steering stability. As described above, the power steering pump device of the present invention can change the discharge amount according to the traveling speed, and can reduce the discharge amount to almost zero when traveling at high speed, thereby reducing the power loss of the engine and improving the life of the pump.

In addition, by making the pump an internal gear type, the fluid noise generating part is covered multiple times by the internal gear, the pump body, and the device base, making it possible to obtain an extremely low-noise device despite high-speed rotation.
Although it has been difficult to use because it is difficult to reduce power loss by changing the discharge amount, it has advantages such as being able to effectively use an internal gear type pump that has fewer components and is relatively inexpensive.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view, and FIGS. 2 and 3 are sectional views taken along line 0 and line mm in FIG. 1, respectively. 1... Pump body, 2... Internal gear, 3... External gear, 4, I
B... Rotating shaft, 5... Partition plate, 8... Device base. Old man figure 1 fin 2 figure fin 3 figure

Claims (1)

[Claims] 1. An internal gear with internal teeth and an external gear with external teeth that mesh with the internal teeth are rotatably housed in the pump body, and the tips of the teeth of both gears slide closely in the air space facing the meshing part. A movable crescent-shaped partition plate is fixed to the pump body, and the pump discharges fluid by the relative rotation of the pump body and gears, and the pump body can freely rotate into the device base whose rotation is restricted. The rotating shafts protrude oppositely from the device base, one of which allows the gears to rotate independently, and the other the pump body, which can be rotated individually, with one of the rotating shafts connected to the engine and the other to the wheels. A power steering pump device that changes the discharge amount depending on the driving speed.