JPH021173Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an automobile steering wheel steering force control device.

(Prior art) As shown in FIG. 1, the conventional steering force control device for an automobile controls the rotation of the rotating shaft 2 of the engine 1 by using pulleys 3, 4 and a belt 5, and by controlling the rotation of the main pump 6.
The oil from the oil tank 7 is supplied to the power steering device 8 to assist the steering force, while the rotation of the transmission countershaft 9 of the engine 1 is controlled by the small pump 1.
0, the oil from the oil tank 7 is returned to the oil tank 7 via the throttle valve 11, and the pressure oil is introduced into the reaction force chamber 12 from between the discharge port of the small pump 10 and the throttle valve device 11, and the vehicle speed is increased. However, the off-the-shelf transmission countershaft had the disadvantage that it was not possible to sufficiently increase the pressure of the discharge volume of the small pump, and the transmission countershaft, oil tank, and pressure chamber were separated from each other. Since the pump is located in a vertical position, the piping space becomes large, and when the vehicle speed is slow, the discharge amount from the small pump is insufficient, resulting in pulsation and pressure fluctuations.

(Purpose) This invention integrates the main pump for power steering and a small pump that obtains pressure oil for the reaction force chamber.
The aim is to enable small pumps to obtain sufficient discharge volume and oil pressure through engine drive, to obtain pressure characteristics without a sense of discontinuity, and to reduce the installation space and simplify the piping to make the overall size smaller. There is.

(Example) FIGS. 2 to 4 show an example of the present invention.
20 is a compound pump housing, which has a main pump chamber 21 on the left and a small pump chamber 22 on the right.
One drive shaft 23 is horizontally supported by a right end bearing 24 and an intermediate bearing 25. The main pump chamber 21 incorporates a well-known vane pump type main pump 31 including a drive shaft 23, a rotor 27, a cam ring 28, a pressure plate 29, and a thrust plate 30. The small pump chamber 22 includes a drive shaft 23, an eccentric ring 33, and a piston 34.
A plunger pump 36, which is well known in the art, is incorporated. 37 is an oil supply port to the main pump 31 that communicates with the oil tank 38, 39 is a discharge port to the power steering 40, 41 is an oil supply port to the small pump 36 that is communicated with the oil tank 38, and 42 is an oil supply port of the small pump 36 that communicates with the oil tank 38. The discharge port has an oil passage communicating with the oil tank 38 via the variable throttle valve device 43 and an oil passage communicating directly with the reaction force chamber 44 . Reference numeral 46 denotes an engine, and the rotation of its rotating shaft 47 is controlled by pulleys 48, 49 and a belt 5.
0 to the drive shaft 23.

Next, the effect will be explained. When the drive shaft 23 rotates due to the rotation of the engine 46, pressure oil discharged from the discharge port 39 of the main pump 31 is supplied to the power steering 40, assists the steering force, and returns to the oil tank 38.

At the same time, the pressure oil discharged from the discharge port 42 of the small pump 36 passes through the variable throttle valve device 43 to the oil tank 3.
Return to 8. At this time, if the variable throttle valve device 43 is open, no throttle pressure is generated at all, no hydraulic pressure acts on the reaction force chamber 44, and no reaction force is generated. When the vehicle speed increases, a detection signal from the vehicle speed sensor (not shown)
The variable throttle valve device 43 is gradually throttled and a throttle reaction force is generated, and this throttle reaction force acts on the reaction force chamber 44 to increase the reaction force.

Note that the small pump may be a vane pump or other pump, and the oil supply port 41 to the small pump may be used.
Alternatively, oil may be supplied from the oil supply port 37 to the main pump 31 through the communication path 45.

(Effects) According to the present invention, one drive shaft is inserted and supported in a housing that has a main pump chamber and a small pump chamber, and the main pump is built into the drive shaft of the main pump chamber, and the small pump is mounted on the drive shaft of the small pump chamber. The outlet of the main pump chamber is connected to the power steering, the outlet of the small pump chamber is connected to the oil tank via a variable throttle valve device, and the reaction force chamber is connected to the engine. The pump also obtains sufficient discharge volume and oil pressure, and provides pressure characteristics with no sense of discontinuity. At the same time, the installation space is reduced, piping is simplified, and the overall size is reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of the entire conventional device, Fig. 2 is a front sectional view of an embodiment of the present invention, and Fig. 3 is A of Fig. 2.
-A side sectional view, FIG. 4 is a schematic explanatory diagram of the entire apparatus to which the present invention is applied. 20...Housing, 21...Main pump chamber, 22...Small pump chamber, 23...Drive shaft, 3
1...Main pump, 36...Small pump, 37
...Main pump oil supply port, 38...Oil tank,
39...Main pump discharge port, 40...Power steering, 42...Small pump discharge port, 43...
...Variable throttle valve device, 44...Reaction force chamber, 46...Engine.

Claims (1)

[Scope of utility model registration request] One drive shaft is inserted and supported in a housing that has a main pump chamber and a small pump chamber, the main pump is built into the drive shaft of the main pump chamber, the small pump is built into the drive shaft of the small pump chamber, and the main pump is built into the drive shaft of the small pump chamber. A composite pump device for controlling the steering force of an automobile steering wheel, in which a discharge port of a small pump chamber is connected to a power steering wheel, a discharge port of a small pump chamber is connected to an oil tank via a variable throttle valve device, and is also connected to a reaction force chamber.