JPH025379U - - Google Patents

Description

[Brief Description of the Drawings] Fig. 1 is a side sectional view of an electric power steering according to an embodiment of the present invention, Fig. 2 is a side view of the embodiment shown in Fig. 1, and Fig. 3 is a side view of the embodiment shown in Fig. 2. FIG. 4a is a partial plan sectional view taken along the line BB in FIG. 2, and FIG. 4b is an enlarged detailed view of the potentiometer fixed part in FIG. 4a. , 4th
Figure c is a sectional view taken approximately along line EE in Figure 4a;
Fig. 5 is an enlarged sectional view of the C section in Fig. 1, Fig. 6 is a sectional view taken along line DD in Fig. 5, Fig. 7 is a side sectional view of the conventional electric power steering, and Fig. 8 The figure is a partially cutaway front view of an electric power steering system equipped with a conventional torque detector, Figure 9 is a cross-sectional view of a conventional eccentric screw mechanism for neutral voltage adjustment, and Figure 10 is a backlash of a conventional reduction gear. FIG. 3 is a vertical cross-sectional view of the adjustment mechanism section. DESCRIPTION OF SYMBOLS 1... Electric motor, 4... Motor gear, 5... Reduction gear, 9... Pinion shaft, 11... Torsion bar, 12... Stub shaft, 15... Fixed side ring gear (first ring gear), 30... ...Potentiometer, 30a...Detection rod, 40, 41
...Two orthogonal surfaces, 42, 43...Mounting surface, 47
, 48...non-disassembly bolt, 50... shim, 51...
...Gearbox, 52...Sensor housing,
53... Screw cover, 55... Concave groove, 57... Pin, 58... Caulked part, 60... Cover, 62
...Gear cover.

Claims (1)

[Claims for Utility Model Registration] (1) Steering torque generated on the steering shaft during steering is detected by a potentiometer via a torsion bar and a gear device, and an electric motor is driven in response to an output signal from the potentiometer. death,
In an electric power steering system that performs power assist control on a steering shaft, a cover that houses the torsion bar and gear device, a sensor housing, and a potentiometer that is fixed to the sensor housing are integrally fixed to each other so that they cannot be disassembled. Features electric power steering. (2) The potentiometer has two flange portions with two mutually perpendicular surfaces, and the two surfaces of the flange portions are fixed in a sealed state by abutting against two corresponding orthogonal surfaces of the housing. The electric power steering according to claim 1, characterized in that: (3) A shim is inserted between the surface of the flange part perpendicular to the axis of the potentiometer and the housing, and the neutral voltage position of the potentiometer is adjusted in advance by the shim, and after adjustment, the neutral voltage position of the potentiometer is adjusted. 3. The electric power steering according to claim 2, wherein the electric power steering is fixed in a disassembled state. (4) The gear device includes a planetary gear device, and a pin is inserted from the housing into a groove formed on the outer periphery of a stationary ring gear attached to the housing of the planetary gear device, and the pin is fixed by caulking. The electric power steering according to claim 1, characterized in that: (5) A small gear coaxially fixed to the output shaft of the electric motor, an intermediate shaft to which a large gear meshing with the small gear is coaxially fixed, and a second gear coaxially fixed to the end of the intermediate shaft.
A small gear, a second large gear meshing with the second small gear, and a second large gear are coaxially fixed to the pinion shaft, the four types of gears are helical gears, and the output shaft, the intermediate 2. The electric power steering system according to claim 1, wherein the shaft and the pinion shaft are positioned only at one end of each shaft without bumping in the axial direction. (6) The electric power steering according to claim 1, wherein the potentiometer is protected by a cover firmly fixed to the sensor housing.