JPS58122258A - Power steering apparatus - Google Patents

Abstract

PURPOSE:To make the entire device small-sized by providing a C-shaped spring between an input shaft gearing with a handle shaft and an output shaft whereon a pinion is formed, by controlling a spool valve by this spring, and by giving a pre-load thereby between the input and output shafts. CONSTITUTION:A gear 13 rotating with an input shaft 1 engages with a gear 31, and is provided with a pin 15. A gear 14 is provided on an output shaft 4 whereon a pinion is formed. The gear 14 is engaged with a gear 32 and provided with a pin 16. The pins 15 and 16 are engaged with a C-shaped spring 17 at the cut part thereof. The rotation of the input shaft 1 is transmitted to the output shaft 4 by the spring 17 and the pins 15 and 16, while the relative rotation of the two shafts caused by the bending of the spring is transmitted to the gears 31 and 32. Since Oldham's couplings 33-35 are provided between these two gears, the gear 31 is moved in the direction of the front and back of this sheet, and this motion is transmitted to a spool valve by a rod 19. Since the C-shaped spring is used, a pre-load is given between the input and output shafts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power steering system, and more particularly to a power steering system in which a control valve for controlling the supply and discharge of pressure fluid to a power cylinder is of a spool type.

Conventionally, a power steering system was used to connect the input and output shafts to a 1.-john bar, and to maintain the system in a neutral state when not in operation (d) due to the torsional force of the 1.-john bar. If you don't know what you've done, please use 9.However, please refer to the version 1. ．． When the force is 1 or 0, the binding station must be in a completely neutral state, so it is impossible to add a preload between the input and output ports at 1.-7 degrees, and it may be 1 or more.

There was a drawback that the structure became larger by 1t1.

The present invention has been developed in view of this slight drawback, and includes the input 10ill and output 10ill sides and the integral parts thereof ((all rotating engaging parts are formed, and these retaining parts are A roughly C-shaped spring that can be engaged with the spring is provided,
Due to the elastic force of this spring: Tsuteko] 1 and others' engagement sound 1j pregnancy
) Provides a power steering device that can apply preload to the human output to hold it in place, and that can also be made light and compact.

The present invention will be described in detail below with reference to the illustrated embodiment. In FIG. 1, J (1) Fi...
3) is an input shaft rotatably supported via ill+, which is linked to a steering wheel (not shown). (4) is the above
The pinion formed on this output shaft (4) is engaged with all the rack rods (7), and the output shaft is rotatably supported in the housing (1) via a bearing (5). Rod (γ) to 7, Uzing (1) to output shaft (4)
It is supported so as to be able to slide freely in a direction perpendicular to , and its both ends are interlocked with steering wheels (not shown).

The input shaft (1) and the output shaft (4) are arranged on the same axis, and there is a bush (8) that protrudes from the tip of the input shaft (1) to receive chips in the thrust direction and the radial direction. By fitting into a hole formed at the end of the output shaft (1) through the input shaft (1), the input shaft (1) and the output shaft (4) can rotate relative to each other. The tip of the input shaft (1) and the end of the output shaft (4) are provided with flange portions (9) facing each other.

As shown in Fig. 2, the flange part (9) on the input shaft (1) side has a plurality of grooves (11) at predetermined intervals on its outer periphery. A plurality of protrusions (+2) 'i are formed at predetermined intervals on the end face of the flange part (to) on the side of 4), and the above-mentioned matching groove (1
1) and each protrusion (1z) in the circumferential direction (with a required gap), the input shaft (1) and the output shaft (4) are inserted into the gap between them. The input shaft (1) can be rotated relative to the
and the distal end of the output shaft (4) as shown in Fig. 1: sea urchin 71. Soλ1. Identical gears (13), (
14A fixed, and VC pins (+5) facing each other are installed in the predetermined positions of each southeast (+9) and (14).
Fully press-fitted and fixed. and the flange portion (9),
By inserting both pins (+5J, (16) f) at both ends of the impaction spring (]7) placed around the outer periphery of θ0), the blade (see Figure 2) is usually 17) to position both pins (15) I (to) on the same axis, so that the protrusion (1) on the output shaft (4) side is normally aligned with the groove (11) on the input shaft (1) 11111. Therefore, the input tll + (1) spring (1qH) is connected to the output shaft (4) by the gap between the protrusion 0 and the groove (11). When the external force applied to both tll + (1) and (4) is removed, one spring (17
), the original relative rotation angle is returned to zero.

Furthermore, it is clear from Figure 2 that J: Uni, the above spring (+7)
&j: It has a roughly C-shape with a part of the annular body cut out, and the thickness gradually increases from the notch to the center, so that the stress generated in this spring is approximately equal in each part. ing.

However, in Fig. 2, (+8) is a control valve mechanism having a conventionally well-known configuration, a rod 09) slidably supported on the nozzle (2), and a spool valve k (K) attached to this rod. After that, the pressure oil is circulated through the oil pump (from 211 to 1221°), and the above rod (19) and J: port examples J and J are displaced in the left and right direction of Hispool Valve Co., Ltd. It has the function of supplying the power cylinder μs to the pipe line (through 271k) and the power cylinder μs through the full valve or port (materials)). Note that this power cylinder (μs) is equipped with a piston (Fuchi) fixed to the rack rod (7).

The above control valve mechanism (18) k Consists of spool valve■
When pressure oil is supplied by the displacement of the steering wheel, the turning of the steering wheel is fully assisted.

The above control valve mechanism (18) and the input/output shaft (:L) I (
4), the relative IJ rotation change and total linear displacement between both shafts (1) and (4) is converted and transmitted to the spool valve of the control valve mechanism (]8). A conversion mechanism (30) is provided to perform the same function as a known power steering device. In this embodiment, a conventionally well-known Oldham joint is used as Id and its conversion mechanism (80). That is, in Figure 1, +
3] 1, (32) Usonzonn said gear<19'J
r (+4.) K meshing gears of the same shape, +33
1 is a protrusion with a rectangular cross section protruding from the end face of one gear (
(31J is the protrusion (83
), and (35) are both opposing protrusions t831, +3'1. The grooves carved on both end faces of this disk (35), which are orthogonal to each other, are placed between the disks (331 and 34i) so as to be slidable on the projections (331, l34i). Engaged - L: From K, Oldham's joint has configuration 1 ~. And one gear 1" that constitutes this Oldham's joint: Engagement I" transition layer 1 (8f
il is rotatably supported on the housing (2), and the rod (
The V'C connection is made by the above conversion mechanism (all rows are configured). Seal b that prevents grease from leaking (A”) + Auto/O)
6- Seal, t4i1 is a cover.

With the above configuration, when the vehicle is traveling straight, that is, the input shaft (1) and the output shaft (4) are stationary,
And when the relative rotational displacement of both is zero, each axis (1)
, 13Z) of the conversion mechanism (80) that meshes with the gear (1B) j (14) provided in (4) is also stationary, and in this state, 1d car 1 gear 1811,
+3 axis of rotation f361, (371 is located on the same axis and is connected to the rotated axis of rotation (37) with the full front end of the spool valve (2Qlid is held in the neutral position).

Therefore, the pressure oil from the oil pump (211) is not introduced into the H power cylinder (28) and the vehicle can travel straight ahead.

From this state, when the input shaft (1) is fully rotated by fully operating the steering wheel (not shown), the output shaft (4) is rotated by the rank rod (7).
) All valves are linked to the steering wheel. Since the steering wheel receives all the road resistance, the input shaft (],) t! ri spring (
17) and rotates relative to the output shaft (4). Then, the gear (1) fixed to the input shaft (J)
The float (81) meshed with the gear (81) rotates with the rotation of its input shaft (1), and the gear (81) rotates integrally with the gear (81) through the Oldham coupling. The output shaft (4
) is meshing with gear (l), so gear 1; (+lζ
cannot rotate with the rotation of the input shaft (1), and as a result, the gear 311 &:L: , gear f1B)
Not rotated by the driving force of -1: Displaced along the sliding direction of the switching rod On.

Gear (81) or its normal resting position, J: 9 displacement n
, the spool valve (20) linked to the south [formerly 811] via the rod (saddle) also moves to its neutral position j: 9, and as is well known, the entire hydraulic circuit is switched and pressure is applied to the power cylinder (281). Fully supply oil to assist in turning the steering wheels.

Then, when the steering wheel starts turning, the output shaft (4), which is interlocked with this through the rank rod (γ), changes to the input shaft (
Fully start rotating in the rotation direction of 1).

The input shaft (1) and the output shaft (4) rotate at the same speed.

When it comes to rO, the southeast (all
, +32) also rotate in the same direction at the same speed. However, the output shaft (4) is subject to road surface steering resistance during the vehicle's turn, so it rotates relative to the input shaft (1). ′ in the displaced state! , will rotate at the same speed as the cutting input shaft (1), and therefore the gear (81) and the valve spool ■, which are interlocked with the valve, will also maintain a displaced state, supplying pressure oil to the cylinder (28). continue. During this time, the driver senses the acting force of the spring (1r1'), which attempts to return the relative rotational displacement of the input/output shafts (1,) and (4) to zero, as an operation reaction force. Also, this spring (I7)
The input shaft (
In order to return the relative rotational displacement between 1) and the output shaft (4) to zero, the gear (81) and valve spool (20J) must also be returned to their original neutral positions. (17) K-ko means pin (to).

06) and held it in a neutral position, it is possible to add a preload that could not be obtained with a device using a conventional torsion bar.
17) is formed so that the stress generated in each part is approximately equal, so even a small spring can obtain a high spring constant, and the entire device can be made smaller and lighter.

Note that if the gear (3+1) is moved greatly in the axial direction of the rod (19), the meshing with the gear (13) will be out of alignment, but generally the spool knob (3+1) that interlocks with the gear (81) ) 9- The displacement amount is small. Since the gap between fMiJ groove 0]) and the protrusion (12) can be adjusted according to the amount of displacement of However, if it is necessary to make a large displacement of the spool valve 1.201 firefly (bow,
The tooth span (811) may be connected to the south IL (19) by a link or the like so that it can rotate around it while maintaining its meshing state, and the rod (1) may be connected to this link or the like.

! , In the above example, the monthly input axis (1) and the output crab ll + (4
) to convert the relative rotational displacement to the entire surface linear displacement (3
Oldham joint is used as 01, but machine 4/Ff which can transmit rotation between two parallel axes like Oldham joint
If there is one, it goes without saying that even if it is a mechanism with other configurations, it can be used as a 1: no word. Figures 4 and 5 (bow-7Cn-'C) show the main parts of different conversion mechanisms, and the mechanism shown in Figure 4 is:
Both gears +81) and 1RZ) have a spline formed on their shafts, and a rotating shaft (13) with a spline formed on both end spherical parts 1g+ to engage with the splines.
, +3Z) are connected.

In the view shown in Fig. 5, both gears Cal+, (:
Connect the inertia with a one-to-one 10- hook universal joint (4, 1,), and connect both joints 04
・) Changes in the gap between the two can be absorbed by splines, etc.

As described above, the present invention requires input (till)
.

By clamping and holding it in a predetermined position by the retaining part fC type spring provided on the side of the force J1, it is possible to create a preload sound between the input and output shafts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an embodiment of the present invention. Figure 3 is a cross-sectional view taken along lines nn and mm in Figure 1, and Figures 4 and 5 are cross-sectional views showing the main parts of the conversion mechanism, which are different from the above figure. FIG. (1): Input side 1 (4): Output shaft (+s)
: tt control valve Isokai CO) Nisspool valve (2
11 oil pump (edge: power cylinder (30)
: Conversion mechanism - 11 - Drawing engraving (no change in content) Figure 1 Procedures Amendment (method) Engineering Case Indication Akio (157 Patent Application No. 145832 2 Name of invention Power steering device 3 Amendment Connection with the case of the person who does the following: 1. Bamboo license applicant 4 representative phone number 03 (241) 3046 @ 2-

Claims (2)

[Claims] (1) Pressure oil from the oil pump by switching the input shaft linked to the steering wheel, the output shaft linked to the steering wheels, and the hydraulic circuit? A spool-type control valve that controls supply and discharge to the power cylinder? In the power steering device provided, the input side 1
A rotating retaining part is formed in the output 1ji11 and the -C groove 6, and a spring that can be retained in the retaining part and has a roughly C-shape is provided, and the elasticity of this spring is A power steering device characterized in that these retaining portions are held at predetermined positions by power generation. (2) The power steering device according to claim 1, characterized in that the shape of the spring is set so that the stress generated in each part of the spring is approximately equal.