AU627623B2 - Power steering input/output shaft joining mechanism - Google Patents
Power steering input/output shaft joining mechanism Download PDFInfo
- Publication number
- AU627623B2 AU627623B2 AU63070/90A AU6307090A AU627623B2 AU 627623 B2 AU627623 B2 AU 627623B2 AU 63070/90 A AU63070/90 A AU 63070/90A AU 6307090 A AU6307090 A AU 6307090A AU 627623 B2 AU627623 B2 AU 627623B2
- Authority
- AU
- Australia
- Prior art keywords
- input shaft
- output shaft
- spline joint
- power steering
- control valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
- B62D5/083—Rotary valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Power Steering Mechanism (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Description
920302,gcpdat.1 8,63070.as,5 Ili~~:i 627623 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION NAME ADDRESS OF APPLICANT: TRW Steering Industrial Products (Japan) Co., Ltd.
Daisan-bunsei Building 8-1, Toranomon Minato-ku, Tokyo-to Japan NAME(S) OF INVENTOR(S): Yoshihito IMURA ADDRESS FOR SERVICE: DAVIES COLLISON Patent Attorneys 1 Little Collins Street, Melbourne, 3000.
COMPLETE SPECIFICATION FOR THE INVENTION ENTITLED: Power steering input/output shaft joining mechanism a S The following statement is a full description of performing it known to me/us:of this invention, including the best method if it Ifa BACKGROUND OF THE INVENTION This invention relates to a structure of the mechanical joint between an input shaft and an output shaft in a vehicle power steering.
In a first related-art device, an input shaft connected to a steering shaft is mechanically joined to an output shaft connected to a rack for driving vehicle wheels. As shown in 0* Fig. 4A and 4B, a projection 20 is formed concc -ically with a 0 o, and at one end of the input shaft 1. The projection 20 has Bo.O the shape of a rhombus with both ends of a length 21 cut.
0e 0 Furthermore, as shown in Figs. 5A and 5B, a groove 30 having a width larger than a width 22 of the projection 20 is provided in the center of one end of the output shaft 2. A hole 31 extends from an axial center C of the output shaft 2 .o0 perpendicularly through one side wall of thfe gioove 30. The hole 31 receives a drive pin 32. The drive p.n 32 engages a control-valve sleeve (not shown) surrounding the input Sshaft i. The input shaft 1 is connected to the output shaft 2 via a known torsion bar (not shown) having the same axis as the input shaft 1 and output shaft 2. The projection 20 and groove 30 are mounted concentrically about the torsion bar. The operation and construction of the control valve and torsion bar are well known in the art and will not be described in further detail.
The projection 20 of the input shaft 1 engages the groove 30 of the output shaft 2. The drive force for steering vehicle wheels is transmitted through the steering la i l
S
r 1
I
0 9 9099 ii 9e .99 o 9 9. 9.
o 0 a o* 9 9 990 9 9999 99R 9 9099 99* a 9 M c It tt I i i 4 shaft to the input shaft 1. When the input shaft 1 thus rotates, the projection 20 is allowed to move in the groove 30 of the output shaft 2 until sides 23 of the projection 20 contact wall surfaces of the groove Therefore, the input shaft 1 rotates relative to the output shaft 2 before the projection 20 contacts the wall surfaces of the groove 30. After the projection 20 contacts the wall surfaces of groove 30, the input shaft 1 rotates the output shaft 2 about their common axis. The rotation angle of the input shaft 1 is thus smaller than that of the output shaft 2. Within the range of the relative rotation angle of the input shaft 1, hydraulic liquid is forced through holes in the control-valve sleeve and the input shaft 1.
In a second related-art device shown in Figs. 6A and 6B, a male spline 40a is formed at one end of the input shaft 1.
On the other hand, as shown in Figs. 7A and 7B, a female spline 40b is formed in one end of the output shaft 2. The male spline 40a and female spline 40b are mounted concentrically about the torsion bar. The female spline allows the male spline 40a to rotate by a small angle. A drive pin 41 for engaging the control valve-sleeve is inserted in the periphery of the female spline 40b. The splines 40a and 40b of the second related-art device operate in the same way as the projection 20 and the groove 30 of the first related-art device.
However, the above-mentioned related-art joint mechanisms between the input shaft and the output shaft have disadvantages. The joint mechanism of the first related-art 2
V'
'i ii -3device as shown in Figs. 4A through 5B is compact. However, since the projection of the input shaft 1 exerts torque on the side walls of the groove 30 of the output shaft 2, the groove 30 of the output shaft 2 expands in its width. Such expansion of the groove 30 results in the defective operation of the control valve. Further, the strength of the joint between the male and female splines 40a and 40b of the second related-art device as shown in Figs. 6A through 7B is greater than the strength of the joint between the projection 20 and the groove 30 as shown in Figs. 4A through However, since the drive pin 41 is held in the periphery of the female spline 40b in the second related-art device, the joint mechanism of the output shaft 2 has a large configuration.
SUMMARY OF THE INVENTION The object of this invention is thus to provide a power steering input/output shaft joining mechanism that has a compact structure and firm joint strength and that 15 keeps a control valve in an excellent operational state.
According to the present invention there is provided a joining mechanism for joining an input shaft and an output shaft of a power steering device having a control valve, comprising: a spline joint for transferring axial rotation between the input shaft and the S: 20 output shaft, where the spline joint comprises a female part connected to one end of Sa
II
~the output shaft and a male part connected to one end of the input shaft; said joining mechanism further comprising a structural projection formed on an inner surface of the female part; a receiving notch formed on the periphery of the male part for receiving the structural projection when the spline joint is assembled; and a drive pin mounted on the outer surface of the female part adjacent to the structural projection for engaging and rotating a sleeve of the control valve.
920505,gcpdaL129,63070c,3 .4.
V, P.4- 1 4- I 4 4 i ii+ g)-f 7-A 47hp '4 m L I. 4L .TJ. 11 A A output shaft. Splines of the input shaft e output shaft form a pair for engagi other. The spline of the output sha s a groove for receiving a drive pin for engagtEng the eentrel-va ve s 9eap p 4, a .060 *000 00 00 0 0 *0 A 0* BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of an assembly of input and output shafts and a control-valve sleeve for an embodiment of this invention.
Fig. 2A is a partial side view of the input shaft in Fig. 1.
Fig. 2B is a front view of the input shaft in Fig. 2A.
Fig. 3A is a partial side view of the output shaft in Fig. 1.
0 0 0000 00 0 p 0 *0 Fig. 3B is a front view of the output shaft in Fig. 3A.
Figs. 4A through 7B illustrate related-art input shafts and output shafts.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In Fig. 1 an input shaft 1, an output shaft 2, and a control-valve sleeve 3 are assembled. The right end of the input shaft 1 in Fig. 1 is connected via a gear Id to a steering shaft (not shown). The left end of the output shaft 2 in Fig. 1 is provided with a pinion 2d. The pinion 2d meshes with a rack for receiving or transmitting steering motion. A -torsion bar (not shown) coaxially joins the input shaft 1 and output shaft 2. Holes 5 thru 8 are provided in the control-valve sleeve 3 and the input shaft 1.
S4 PP _I A hydraulic power source (not shown) is associated via the holes 5 thru 8 with a hydraulic cylinder (not shown). When the control-valve sleeve 3 rotates relative to the input t shaft 1, liquid is forced from the hydraulic power source through the holes 5 thru 8 into a hydraulic- cylinder. The hydraulic cylinder moves the rack axially.
As shown in Figs. 2A and 2B the input shaft 1 is cylindrical. A male spline la is formed on the left end of the input shaft 1 in Fig. 2A. The male spline la includes a slot Ic formed in the lower part of the male spline la along a a chord Ib defined by two points on the periphery of the male spline la, as shown in Figs. 2A and 2B. The torsion bar (not so at Q shown) is inserted in the input shaft 1 so that the torsion o, bar is concentric, and has some clearance, with the input shaft 1. One end of the torsion bar is pinned to the other end of the input shaft 1.
a a The left end of the output shaft 2 in Fig. 3A is cylindrical. A female spline 2a is provided inside the output shaft 2. The other end of the torsion bar extends through the female spline 2a, and is concentrically secured to the output shaft 2. One end of the torsion bar is secured •I to the input shaft 1 and the other end thereof is secured to the output shaft 2. The male spline la is inserted in the female spline 2a. The teeth of the male spline la and the teeth of the female spline 2a have some clearance therebetween to allow the input shaft 1 to rotate relative to the output shaft 2. Along a chord 2b corresponding to the chord Ib, a projection 2c is formed in the female spline 2a.
.iL^_ii.lili A drive pin 4 projects perpendicularly from the chord 2b in a radial direction and engages with the control-valve sleeve 3 surrounding the input shaft 1.
When a steering handle (not shown) is operated, the input shaft 1 connected to the steering shaft-rotates, twists the torsion bar inside and puts the male spline la into contact with the female spline 2a of the output shaft 2.
When the input shaft 1 rotates, an angular difference occurs between the input shaft 1 and the output shaft 2 and between o..o the input shaft 1 and the control-valve sleeve 3 mounted via the drive pin 4 on the output shaft 2. Liquid is forced from *909 the hydraulic power source through the holes 5 thru 8 in the *0 *9 control-valve sleeve 3 and the input shaft 1 into the eoo hydraulic cylinder. The hydraulic cylinder moves the rack in the axial direction, and rotates the output shaft 2 through *9 the pinion 2d. The angular difference of the output shaft 2 9 *999 from the input shaft 1 is thus eliminated. Consequently, hydraulic pressure at opposite sides of a piston (not shown) in the hydraulic cylinder is balanced.
The input shaft 1 and the output shaft 2 are splined.
The slot lc and the projection 2c are provided in the male o and female splines la and 2a, respectively, and the projection 2c receives the drive pin 4. The joint mechanism between the input shaft 1 and the output shaft 2 is thus firm and compact.
From the above description of a preferred embodiment of the invention, those skilled in the art will perceive improvements, changes, and modifications. Such improvements, 6 ft If changes and modifications within the skill of the art are
-J
intended to be covered by the appended claims.
9 :1: 4 4 0 .4 @4 e q 4 4 44 4 9 0440 44 04 4 .44, 9 OS 4 404444 4 .4 4 tO *4
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Claims (19)
1. A joining mechanism for joining an input shaft and an output shaft of a power steering device having a control valve, comprising: a spline joint for transferring axial rotation between the input shaft and the output shaft, where the spline joint comprises a female part connected to one end of the output shaft and a male part connected to one end of the input shaft; said joining mechanism further comprising a structural projection formed on an inner surface of the female part; a receiving notch formed on the periphery of the male part for receiving the structural projection when the spline joint is assembled; and a drive pin mounted on the outer surface of the female part adjacent to the structural projection for engaging and rotating a sleeve of the control valve. 15
2. The joining mechanism of claim 1, in which the spline joint allows rotation of the input shaft relative to the output shaft through a small angle.
3. The joining mechanism of claim 1, in which the structural projection contains a first surface that is substantially parallel to the axis of the spline joint, where the 20 first surface is defined by a chord connecting two end points on the inner surface of the female pa:t. substa surfac 10 6. female r I rr o o r e r cr l: Sr 6 s 5 0 source output r* r r r* B *c
4. The joining mechanism of claim 3, in which: CS *p project where _I-cl I~I~ -9- the receiving notch contains a second surface that is substantially parallel to the axis of the spline joint, where the second surface is defined by a chord connecting two end points on the outer surface of the male part; and the first surface opposes the second surface when the spline joint is assembled.
The joining mechanism of claim 3, in which the drive pin is mounted substantially equidistant from the two end points of the chord defining the first surface.
6. The joining mechanism of claim 1, in which the driving pin is mounted on the female part such that the driving pin extends into the structural projection.
7. A power steering device comprising: an input shaft connected at a first end to a steering shaft; an output shaft connected at a second end to a rack for turning vehicle wheels; •a control valve mounted on the input shaft for controlling a hydraulic power source to move the rack; a spline joint for transferring axial rotation between the input shaft and the output shaft, comprising 20 a structural projection, a female part mounted on a first end of the output shaft, the structural projection extending from the inner surface of the female part, and Sa male part of the spline joint mounted on a second end of the input shaft, where a receiving 920625,gqxl.L001,6307W0., 9 I: notch is formed on the periphery of the male part for receiving the structural projection when the spline joint is assembled; a torsion b+-r for connecting the input shaft and the output shaft; and a drive pin for operating the control valve mounted on the outer surface of the female part adjacent to the structural projection. ooo
8. The power steering device of claim 7, in which oe the spline joint allows ro,.ation of the input shaft relative to the output shaft through a small angle.
9 eO 0 S:r.a 9. The power steering device of claim 7, in which the structural projection contains a first surface that is substantially parallel to the axis of the spline joint, where the first surface is defined by a chord connecting two end points on the ii..-er surface of the female part.
10. The power steering device of claim 9, in which: the receiving notch contains a second surface i 0 'j that is substantially parallel to the axis of the spline joint, where the second surface is defined by a chord 1 connecting two end points on the outer surface of the male part; and the first surface opposes the second surface when the spline joint is assembled.
11. The power steering device of claim 9, in which ru~Ya th- drive pin is mounted substantially equidistant from the4 two end points of the chord defining the first surface.
12. The power steering device of clai.m 7, in which the driving pin is mounted on the female part such that the driving pin extends into the structural projection.
13. The power steering device of claim 7, in which the drive pin drives the control valve by contacting a sleeve ~of the control valve and rotating the control valve about the a, axis of the input shaft. 0
14. A power steering device comprising: 0 oI o0 ~an input shaft connected at a first end to a steering shaft; an output shaft connected at a second end to a rack for turning vehicle wheels; t a torsion bar for transferring torque between 0 the input shaft and the output shaft; and a control valve, having a sleeve, mounted on S the input shaft around the torsion bar for controlling a 2 hydraulic power source to move the rack; a spline joint for transferring axial rotation between the input shaft and the output shaft, where the spline joint allows rotation of the input shaft relative to the output shaft through a small angle, comprising a hollow, cylindrical female part having engaging projections mounted on a first end of the output shaft, where a structural projection extends from 11 i I the cylindrical inner surface of the female part along a I; cord connecting two end points on the inner surface of I the female part, and a hollow, cylindrical male part having engaging recesses that engage the engaging projections, where the male part is coaxially mounted on the second end of the input shaft within the sleeve of the control valve and has a receiving notch formed thereon for receiving the structural projection when the spline joint is assembled is formed on the periphery of the male part along a cord connecting two end points on the periphery of the male part; a drive pin for moving the sleeve of the control valve mounted on the outer surface of the female part adjacent to the structural projection such that a first end of the drive pin extends into the structural projection formed on the female part.
I. The power steering device of claim 14, in which: V the structural projection contains a first S" surface that is substantially parallel to the axis of the spline joint and is defined by the chord connecting two end points on the inner surface of the female part; and the receiving notch contains a second surface that is substantially parallel to the axis of the spline joint and is defined by the chord connecting two end points on the outer surface of the male part; and 12 k J the first surface opposes the second surface when the spline joint is assembled.
16. The power steering device of claim 15, in which the drive pin is mounted equidistant from the two end points of the chord defining the first surface.
17. The power steering device of claim 14, in which the driving pin is mounted on the female part such that the first end of the driving pin extends beyond the cylindrical inner surface from which the structural I projection extends. r j
18. The power steering device of claim 14, in which a second end of the drive pin drives the control valve by contacting the sleeve of the control valve and rotating the control valve about the axis of the input shaft. i- f t1 I* i: 13 I§1 :-I 14-
19. A joining mechanism substantially as hereinbefore described with reference to Figures 1, 2 and 3 of the drawings. A power steering device substantially as hereinbefore described with reference to Figures 1, 2 and 3 of the drawings. i i ::I ro a oo so 0 0 o o5oo so 0 o1 O so so os r so onro I r so L a os o o so a DATED this 5th day of May, 1992 TRW STEERING INDUSTRIAL PRODUCTS (JAPAN) CO., LTD. By its Patent Attorneys DAVIES COLLISON CAVE ~B z A1 0 f n~c 920505,gcpdaLl29,63070.c,14
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989138987U JPH0751423Y2 (en) | 1989-11-30 | 1989-11-30 | Connection structure of input and output shaft of power steering device |
| JP1-138987 | 1989-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6307090A AU6307090A (en) | 1991-06-06 |
| AU627623B2 true AU627623B2 (en) | 1992-08-27 |
Family
ID=15234836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU63070/90A Ceased AU627623B2 (en) | 1989-11-30 | 1990-09-21 | Power steering input/output shaft joining mechanism |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPH0751423Y2 (en) |
| KR (1) | KR960015708B1 (en) |
| AU (1) | AU627623B2 (en) |
| DE (1) | DE4038288A1 (en) |
| FR (1) | FR2655006B1 (en) |
| GB (1) | GB2238598B (en) |
| IT (1) | IT1245301B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4445634C2 (en) * | 1994-12-21 | 1997-10-16 | Walterscheid Gmbh Gkn | clutch |
| DE19644511A1 (en) * | 1996-10-25 | 1998-04-30 | Zahnradfabrik Friedrichshafen | Drive connection between input and output shafts |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1218267A (en) * | 1968-10-18 | 1971-01-06 | Jackson Brothers London Ltd | Improved means for securing a member on to a spindle or shaft |
| GB2061458A (en) * | 1979-10-22 | 1981-05-13 | Naddella | Coupling |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB917908A (en) * | 1960-02-12 | 1963-02-06 | Rau Swf Autozubehoer | Improvements in or relating to mounting a crank on a windscreen wiper motor shaft |
| FR2178379A5 (en) * | 1972-03-30 | 1973-11-09 | Dba |
-
1989
- 1989-11-30 JP JP1989138987U patent/JPH0751423Y2/en not_active Expired - Lifetime
-
1990
- 1990-09-18 GB GB9020396A patent/GB2238598B/en not_active Expired - Fee Related
- 1990-09-21 AU AU63070/90A patent/AU627623B2/en not_active Ceased
- 1990-10-05 KR KR1019900015780A patent/KR960015708B1/en not_active IP Right Cessation
- 1990-11-26 IT IT02219090A patent/IT1245301B/en active IP Right Grant
- 1990-11-29 FR FR909014943A patent/FR2655006B1/en not_active Expired - Fee Related
- 1990-11-30 DE DE4038288A patent/DE4038288A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1218267A (en) * | 1968-10-18 | 1971-01-06 | Jackson Brothers London Ltd | Improved means for securing a member on to a spindle or shaft |
| GB2061458A (en) * | 1979-10-22 | 1981-05-13 | Naddella | Coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| KR960015708B1 (en) | 1996-11-20 |
| GB9020396D0 (en) | 1990-10-31 |
| KR910010090A (en) | 1991-06-28 |
| IT9022190A1 (en) | 1991-06-01 |
| JPH0751423Y2 (en) | 1995-11-22 |
| GB2238598A (en) | 1991-06-05 |
| DE4038288A1 (en) | 1991-06-06 |
| IT9022190A0 (en) | 1990-11-26 |
| FR2655006A1 (en) | 1991-05-31 |
| FR2655006B1 (en) | 1994-10-14 |
| JPH0377780U (en) | 1991-08-06 |
| IT1245301B (en) | 1994-09-19 |
| AU6307090A (en) | 1991-06-06 |
| GB2238598B (en) | 1993-09-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |