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1. 发明专利

JP2002145090A DUST BOOT FOR POWER STEERING DEVICE 失效
公开(公告)号：JP2002145090A
公开(公告)日：2002-05-22
申请号：JP2000339691
申请日：2000-11-07
申请人： SHOWA CORP
发明人： SERIZAWA AKIHIKO
IPC分类号： B62D3/12 , B62D5/10 , B62D5/22
摘要： PROBLEM TO BE SOLVED: To improve installing performance, to make an outer diameter compact, and to improve durability without complicating a shape of a dust boot. SOLUTION: In this dust boot 20 for a power steering device, an installing part 23 to a fitting part 19A arranged on a tie rod 19 of the dust boot 20 is formed so as to be freely slidable in the shaft direction to the fitting part 19A, and the extending length of the dust boot 20 is set smaller than a moving distance of a rack shaft 16.

2. 发明专利

JP2001301633A FLUID PRESSURE TYPE POWER STEERING DEVICE FOR VEHICLE 失效
公开(公告)号：JP2001301633A
公开(公告)日：2001-10-31
申请号：JP2000124784
申请日：2000-04-25
申请人： SHOWA CORP
发明人： SERIZAWA AKIHIKO , ISHIWATARI MASARU
IPC分类号： B62D6/00 , B62D5/06 , B62D5/07 , B62D5/083 , B62D101/00 , B62D123/00 , B62D127/00
摘要： PROBLEM TO BE SOLVED: To provide a fluid pressure type power steering device for a vehicle having a large freedom degree of setting of steering assisting force set in accordance with car speed. SOLUTION: This fluid pressure type power steering device for a vehicle is provided with a main control valve 29 of which valve opening is controlled based on relative movement of an input shaft interlocked with a steering wheel and an output shaft interlocked with a steering mechanism to steer the steering wheel, a power cylinder mechanism 21 to generate steering assisting force, a pump device 1 to discharge a constant flow of working fluid, a first flow passage including a supply passage 14 communicated with the main control valve 29, and a control unit 4 to control an assist control valve 32. The main control valve 29 controls supply quantity of the working fluid in the first flow passage to the power cylinder mechanism 21, and the assist control valve 32 to control flow of a part of the working fluid discharged from the pump device 1 is controlled by the control unit 4 to a set valve opening set based on car speed and hydraulic pressure of the working fluid in the first flow passage.

3. 发明专利

JP2001158370A POWER STEERING DEVICE 失效
公开(公告)号：JP2001158370A
公开(公告)日：2001-06-12
申请号：JP34231999
申请日：1999-12-01
申请人： SHOWA CORP
发明人： HAMANO SEIJI , SERIZAWA AKIHIKO , FUJITA HIROYUKI , AIKO SATOSHI
IPC分类号： B62D5/07 , B62D5/06 , B62D5/083 , F16K27/00
摘要： PROBLEM TO BE SOLVED: To stabilize a damper in a power steering device and enhance the assembling and disassembling properties of the device during maintenance by easily and securely fixing to a housing a partition member constituting a damper valve. SOLUTION: The power steering device 10 has the damper valve 50. The damper valve 50 has the partition member 52 sandwiched between a cap 55 and the housing 51.

4. 发明专利

JP2001018816A POWER STEERING DEVICE 失效
公开(公告)号：JP2001018816A
公开(公告)日：2001-01-23
申请号：JP19475399
申请日：1999-07-08
申请人： SHOWA CORP
发明人： O TOMOHISA , SERIZAWA AKIHIKO
IPC分类号： B62D5/083 , B62D5/22
摘要： PROBLEM TO BE SOLVED: To improve the rigidity of a sleeve, to ensure the operation of high quality while reducing an amount of oil leakage by minimizing a clearance between the sleeve and a rotary spools, and to improve the characteristics of a valve by positioning upper ends of vertical grooves adjacent to each other in zigzag. SOLUTION: Upper end positions of adjacent vertical grooves are arranged in zigzag in such manner that a vertical groove 31A is located on an upper position, and lower end positions thereof are arranged in zigzag in such manner that a vertical groove 32A is located on a lower position. By arranging the upper ends of the vertical grooves 31A, 32A formed on an inner surface of a sleeve 24 in zigzag, and arranging the lower end positions in zigzag, the rigidity of the sleeve 24 is increased, and a pressure receiving area of the sleeve 24 can be reduced. Accordingly the generation of distortion of the sleeve 24 caused by the hydraulic oil acting on the inner surface of the sleeve 24 can be inhibited, and the sleeve 24 and a rotary spool 23 can be properly operated by reducing an amount of oil leakage by minimizing the clearance between the sleeve 24 and the rotary spool 23.

5. 发明专利

JP2000247248A REACTION MECHANISM FOR HYDRAULIC POWER STEERING 失效
公开(公告)号：JP2000247248A
公开(公告)日：2000-09-12
申请号：JP5332599
申请日：1999-03-01
申请人： SHOWA CORP
发明人： O TOMOHISA , SERIZAWA AKIHIKO
IPC分类号： B62D5/083
摘要： PROBLEM TO BE SOLVED: To simplify structure and to reduce the number of part items and manufacturing cost while maintaining and improving a feeling of straight advancing stability during medium and high speed travel in a reaction mechanism for a hydraulic power steering used for a vehicle. SOLUTION: A reaction mechanism 20 for a hydraulic power steering constituted to feed either one of lateral oil chambers of a power cylinder according to the relative rotation quantity difference between an input shaft 3 and a sleeve 8 rotated integrally with an output shaft 4, to output steering assist force and to impart pre-load to a torsion bar 5 in neutral, comprises a ring-like ball holder 21 integrally connected to the end of the sleeve 8 by caulking or press-fitting and having a plurality of through holes 28 circumferentially to insert balls 22; a plurality of balls 22; a ring-like plate spring 23 for pressing the balls 22 from the outside; and a cam face 25 formed at the outer peripheral surface of the input shaft 3 and having recessed parts for seating the balls 22. In neutral, the plate spring 23 presses the balls from the outside to seat them in the recessed parts 26 of the cam face 25 through the through holes 28 of the ball holder 21.

6. 发明专利

JP2000168595A DAMPER VALVE OF HYDRAULIC POWER STEERING DEVICE 失效
公开(公告)号：JP2000168595A
公开(公告)日：2000-06-20
申请号：JP34252798
申请日：1998-12-02
申请人： SHOWA CORP
发明人： HAMANO SEIJI , SERIZAWA AKIHIKO , AIKO SATOSHI
IPC分类号： B62D5/07 , F16F9/512 , F16K47/04
摘要： PROBLEM TO BE SOLVED: To provide a damper valve for a hydraulic power steering device of a vehicle capable of establishing an improved damping performance, eliminating the resisting or sticking feeling in the steering operation, particularly in the low-speed running, enhancing the comfortableness in steering, and decreasing the number of component parts. SOLUTION: A damper valve 30 of a hydraulic power steering device is equipped with a piston valve 46 installed in a working oil circuit tying an oil passage selector valve in a gear box to the left and right oil chambers of a power cylinder and opening with a flow of a working oil circulated back to the oil passage changeover valve from either of the left and right oil chambers and a check valve 40 installed in the valve element 36 of the piston valve 46 and allowing flow-through of only the working oil supplied to either oil chamber of the power cylinder from the oil passage selector valve. The piston valve 46 forms a throttled oil passage with flow-through of the circulated working oil having a pressure below a certain level and forms a full open oil passage with flow-through of the circulated working oil having a pressure over the specified level. Oil passages 39 and 36a for the circulated working oil are formed in the valve element 36 of the piston valve 46.

7. 发明专利

JP2001158369A POWER STEERING DEVICE 失效
公开(公告)号：JP2001158369A
公开(公告)日：2001-06-12
申请号：JP34232699
申请日：1999-12-01
申请人： SHOWA CORP
发明人： HAMANO SEIJI , SERIZAWA AKIHIKO , FUJITA HIROYUKI , AIKO SATOSHI
IPC分类号： B62D5/07 , B62D5/06 , F16F9/348
摘要： PROBLEM TO BE SOLVED: To provide a power steering device having a damper valve and eliminating steering load which a driver may feel when turning a steering wheel to the right or left in starting to steer the vehicle from a neutral state. SOLUTION: The power steering device 10 has the damper valve 50. The second valve device 54 of the damper valve 50 has a valve plate 65 moving into and out of contact with a partition member 52 to open and close a through flow path 56 provided in the partition member 52. A fluid reservoir recess 70 is provided in the area of contact between the partition member 52 and the valve plate 65.

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