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1. 发明专利

JP2000225958A POWER STEERING DEVICE 失效
公开(公告)号：JP2000225958A
公开(公告)日：2000-08-15
申请号：JP2693599
申请日：1999-02-04
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO , HAGIHIRA SHINICHI , TAKAI MASASHI , CHIBA SHIGEO
IPC分类号： B62D5/07
摘要： PROBLEM TO BE SOLVED: To preclude giving a sense of incompatibility in the steering feeling when a steering wheel in neutral position is turned to left or right. SOLUTION: A power steering device is equipped with a second control part 21 and a first control part 20 consisting of four variable throttles, and an on-off valve 23 is installed downstream of the second control part 21. One pilot chamber 23a of this on-off control valve 23 is connected with the upstream of an orifice 22 while other pilot chamber 23b is connected to downstream of the orifice 22. When the operation needs an assisting force, the second control part 21 is kept in the flow-through condition so that a rise of the pressure is suppressed.

2. 发明专利

JPH10297511A POWER STEERING DEVICE 失效
公开(公告)号：JPH10297511A
公开(公告)日：1998-11-10
申请号：JP14720897
申请日：1997-05-21
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO , HAGIHIRA SHINICHI , TSUKADA YOSHIYUKI , TAKAI MASASHI
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To provide a power steering device which can improve neutral rigidity by applying a preset force and improve assembling property and productivity. SOLUTION: A power steering device which relatively rotates an input shaft 4 and an output shaft 2 by twisting a torsion bar 5 to apply an assist force according to the relative rotation has a spring housing room 9 made in a member rotated integrally with the output shaft 2 or the output shaft 2, a pair of spring bodies 13 disposed to sandwich the input shaft 2 disposed in the spring housing room 9, a first supporting part formed in the spring body 13, a second supporting part opposed to the first supporting part in a neutral state, and a ball or a roller 21 interposed between the first and second supporting parts. When the shafts 2, 4 are relatively rotated and the ball or the roller 21 is being separated from the first and second supporting parts, the ball or the roller 21 is rotated while bending the spring bodies 13.

3. 发明专利

JPH10278821A POWER STEERING DEVICE 失效
公开(公告)号：JPH10278821A
公开(公告)日：1998-10-20
申请号：JP9795497
申请日：1997-03-31
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To prevent contamination of chips in a sliding part to obstruct smooth movement of the sliding part as well as to reduce assembly manhours and the number of parts at the time of assembling an input shaft and a torsion bar. SOLUTION: At least one cutout surface 22 is formed on an outer periphery of the other end side 10b of a torsion bar 10 and a part corresponding to this cutout surface 22 is caulked on a power steering device constituted by furnishing an input shaft 9 interlocked with a handle and forming a hollow part 15 in the axial direction, an output shaft 3 coaxially arranged with this input shaft and interlocked with a steering rod 2 and the torsion bar 10 one end side 10a of which is fixed on the output shaft 3 and the other end side 10b of which is fixed on the input shaft 9 in the hollow part 15 and to control assist force by relative rotation of both of these shafts.

4. 发明专利

JPH09301202A POWER STEERING DEVICE 失效
公开(公告)号：JPH09301202A
公开(公告)日：1997-11-25
申请号：JP14358596
申请日：1996-05-14
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To provide a power steering device which can attain more ideal assist force characteristics and cost reduction with only first and second control parts. SOLUTION: The openings of A-D of variable throttles A-D, E-H formed into a rotary valve become small when the rotary valve operates and become small moderately after its operating angle reaches θ1 . The openings of the variable throttles E, F becomes small later than the first control part when the rotary valve operates, and become small moderately after its operating angle reaches θ2 larger than above θ1 . The openings of the variable throttles G, H become larger moderately when the rotary valve operates, and are kept open when its operating angle is θ2 or more and after the openings reach θ3 which is larger than those of the variable throttles E, F.

5. 发明专利

JPH09254800A STEERING FORCE CONTROLLER FOR POWER STEERING 失效
公开(公告)号：JPH09254800A
公开(公告)日：1997-09-30
申请号：JP9363396
申请日：1996-03-22
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To suppress uncomfortable fluid noise while maintaining assist force control by arranging a plurality of fixed throttles in series in a third control unit and gradually reducing openings of the plurality of fixed throttles toward the downstream side. SOLUTION: In a rotary valve constructed of a rotary spool 8 and a sleeve 9, a first control unit I and a second control unit II are arranged in parallel, and in the oil discharged from a pump, the supplying direction of the oil to be led to a power cylinder is controlled by means of the first control unit I, while a flow rate of the oil to be led to a tank is controlled by means of the second control unit II. A third control unit II is arranged on the downstream side of the second control unit III, while a plurality of fixed throttles 35, whose openings are gradually reduced toward the downstream side, are arranged in series inside the rotary spool 8 in the third control unit III. In this way, an ideal power assist characteristic can be obtained during an intermediate-high speed travel time and in a low speed travel time, so that uncomfortable fluid noise when a handle is steered can be suppressed.

6. 发明专利

JPH09249139A POWER STEERING DEVICE 失效
公开(公告)号：JPH09249139A
公开(公告)日：1997-09-22
申请号：JP8882196
申请日：1996-03-18
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To restrain generation of uncomfortable fluid noise and attain cost reduction by constructing a third control part such that a restriction part which maintains the opening thereof constant if a rotary valve is changed over is positioned upstream of a tank port communicating, at the position upstream of communication control groove of second control part, with a return recess part. SOLUTION: Second pump ports 55, 56, second communication recess parts 61, 62, communication control grooves 57-60 and return recess parts 21-24 construct a second control part II controlling the quantity of flow to be returned to a tank. A restriction part 71 maintaining the opening thereof constant if a rotary valve is operated is provided upstream of tank ports 67-70 with which return recess parts 21-24 are communicated at the position downstream of the grooves 57-60 of the second control part II. The restriction part 11 composes a third control part III positioned downstream of the second control part II. Accordingly generation of unpleasant fluid noise is restrained, and a compact structure and cost reduction are made possible.

7. 发明专利

JPH09249138A POWER STEERING DEVICE 失效
公开(公告)号：JPH09249138A
公开(公告)日：1997-09-22
申请号：JP8476896
申请日：1996-03-13
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO , HAGIHIRA SHINICHI
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To prevent the steering feeling of a driver from being influenced, by making first and second variable throttles center close while third and fourth variable throttles center open. SOLUTION: Left and right control grooves 31, 32 are communicated with left and right chambers 26, 27 of power cylinder PC and discharge grooves 34, 35 are communicated with a tank. On both sides of first supply groove 33 the left and right control grooves 31, 32 are positioned and outside the grooves 31, 32 the discharge grooves 34, 35 are positioned. The grooves 33, 32 constructs a first variable restrictor 22 while the grooves 33, 32 a second variable throttle 23. The grooves 32, 35 constructs a third throttle 24 while the groove 31, 34 a fourth variable throttle 25. The throttle 22, 23 are made center close while the throttles 24, 25 center open. Accordingly almost no influence of shock at the time of muximum flow of supply is given to a driver.

8. 发明专利

JPH08282515A POWER STEERING DEVICE 失效
公开(公告)号：JPH08282515A
公开(公告)日：1996-10-29
申请号：JP32110595
申请日：1995-11-15
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO
IPC分类号： B62D6/02 , B62D5/07
摘要： PURPOSE: To decrease control flow at nonsteering and reduce energy loss by retaining the control flow to the min. flow if a power cylinder has low load pressure, and increasing the control flow to the flow required for assistant force when the load pressure arrives at the predetermined pressure. CONSTITUTION: A flow control mechanism 2 controls flow in accordance with the load pressure P of a power cylinder. Namely, if the power cylinder C has the low load pressure P, control flow Q is retained to the min. flow Q1 ; when the load pressure P arrives at the predetermined pressure P2 , the control flow Q is increased to flow Q2 required for assistance. Therefore, in the low load pressure P range, namely, at nonsteering, only the min. flow Q1 passes through a valve mechanism 7. Decreasing flow passing through the valve mechanism 7 depresses pressure loss generated in cylinder variable throttles 7a-7d, a pipe line, etc., accordingly to reduce energy loss. The higher load pressure P at steering results in increase to the flow Q2 to obtain sufficient assistant force.

9. 发明专利

JPH08142890A POWER STEERING 失效
公开(公告)号：JPH08142890A
公开(公告)日：1996-06-04
申请号：JP31113394
申请日：1994-11-21
申请人： KAYABA INDUSTRY CO LTD
发明人： SUZUKI KATSUHIRO
IPC分类号： B62D5/083
摘要： PURPOSE: To provide a power steering inexpensive with high reliability without using an electric signal. CONSTITUTION: A sleeve 6 is provided around a rotary spool 5 linked with a steering wheel H, and a pair of valve parts for performing the dividing control of a pump discharge fluid according to the steering of the steering wheel H are provided on the diameter line of the rotary spool 5 and sleeve 6. The rotary spool 5 and the sleeve 6 are provided with a first cylinder variable throttle and a second cylinder variable throttle, enlarged in the opening according to the steering of the steering wheel H, on the way of communicating the first output port and second output port of the valve parts with the first cylinder chamber 23a and second cylinder chamber 23b of a power cylinder.

10. 发明专利

JPH0635273B2 失效
公开(公告)号：JPH0635273B2
公开(公告)日：1994-05-11
申请号：JP8950185
申请日：1985-04-25
申请人： KAYABA INDUSTRY CO LTD
发明人： KOMAMURA SEIJI , SUZUKI KATSUHIRO
IPC分类号： B62D5/08 , B62D5/22 , B62D6/00 , B62D6/02 , B62D101/00 , B62D113/00

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