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1. 发明专利

JP2002349450A VARIABLE DISPLACEMENT VANE PUMP 失效
公开(公告)号：JP2002349450A
公开(公告)日：2002-12-04
申请号：JP2001159466
申请日：2001-05-28
申请人： KAYABA INDUSTRY CO LTD
发明人： YAKABE SHINJI , NAGATA SEIICHI , INOUE ATSUSHI , HAYASHI MASUMI
IPC分类号： F04C2/344 , F04C14/22 , F04C14/24 , F04C15/04
摘要： PROBLEM TO BE SOLVED: To provide a variable displacement vane pump capable of responsively reducing a pump discharge flow rate when a relief valve is opened. SOLUTION: The variable displacement vane pump has a first cam driving pressure chamber 11 contracted with an increase of pump displacement, a second cam driving pressure chamber 12 contracted with a decrease of the pump displacement, a control valve 31 changing over driving pressure of a cam ring 3 with an increase of the pump discharge flow rate, and the relief valve 41 releasing pump discharge pressure as it rises exceeding a prescribed value, wherein, in response to the opening of the relief valve 41, the control valve 31 guides the pump discharge pressure into the first cam driving pressure chamber 11 and further releases the pump discharge pressure guided into the second cam driving pressure chamber 12, thereby improving drive responsiveness of the cam ring 3 when the relief valve 41 is opened.

2. 发明专利

JP2000249078A VARIABLE DISPLACEMENT VANE PUMP 失效
公开(公告)号：JP2000249078A
公开(公告)日：2000-09-12
申请号：JP4782399
申请日：1999-02-25
申请人： KAYABA INDUSTRY CO LTD
发明人： HAYASHI MASUMI , NAGASAKA RYOICHI
IPC分类号： F04C2/344 , F04C14/22 , F04C15/04
摘要： PROBLEM TO BE SOLVED: To provide stable flow rate characteristics even when a load pressure is fluctuated. SOLUTION: A variable orifice 25 is provided between the pump chamber 12 on the discharge side of a vane pump and a discharge port 18, and a pressure in a spot situated upper stream from the variable orifice 25 is introduced to a first fluid pressure chamber 31 on the outer periphery of a cam ring 5 through a control valve 40. Meanwhile, a pressure in a spot situated downstream from the variable orifice 25 is introduced to a second fluid pressure chamber 31 through an annular gap 61, and a pressure in a spot situated upper stream from the variable orifice 25 is introduced through an orifice 62. An annular gap 61 is provided between the through-hole 3a of an adapter ring 3 and the outer periphery of a feedback pin 60 piercing through the through-hole 3a and making contact with the side face on the second fluid pressure chamber 32 side of the cam ring 5. The feed back pin 60 is brought into contact with the tip of a control piston 21, incorporating a spring 22, on the base end side, and the opening area of the variable orifice 25 is narrowed through backward movement of the control piston 21.

3. 发明专利

JP2000170667A VARIABLE DELIVERY VANE PUMP 失效
公开(公告)号：JP2000170667A
公开(公告)日：2000-06-20
申请号：JP34676098
申请日：1998-12-07
申请人： KAYABA INDUSTRY CO LTD
发明人： HAYASHI MASUMI , NAGASAKA RYOICHI
IPC分类号： F04C2/344 , F04C14/22 , F04C14/24 , F04C15/06 , F04C15/04
摘要： PROBLEM TO BE SOLVED: To easily stabilize pump discharge rate properties in a high pump revolution region. SOLUTION: A variable orifice 25 and a fixed orifice 61 are provided in parallel with each other between a discharge side pumping chamber 12 and a discharge port 18, and a first hydraulic pressure chamber 82 into which the pressure upperstream of the variable orifice 25 and fixed orifice 61 is introduced and a second hydraulic pressure 31 into which the pressure downstream of the variable orifice 25 and fixed orifice 61 is introduced are provided on both sides of a cam ring 5. A control plunger 21 containing a spring 22 which follows the movement of the cam ring 5 and energizes the cam ring 5 in the direction to increase the eccentricity of the cam ring 5 is provided on the side of the second hydraulic pressure chamber 31. With a decrease in the eccentricity of the cam ring 5, a control plunger base end side edge 21b narrows the opening area of the variable orifice 25. The opening area of the fixed orifice 61 is set so that pump discharge flow rate is stabilized constant in a high pump revolution region.

4. 发明专利

JP2000073967A VARIABLE DISPLACEMENT TYPE VANE PUMP 失效
公开(公告)号：JP2000073967A
公开(公告)日：2000-03-07
申请号：JP24828698
申请日：1998-09-02
申请人： KAYABA INDUSTRY CO LTD
发明人： HAYASHI MASUMI
IPC分类号： F04C2/344 , F04C14/22 , F04C14/24 , F04C15/06 , F04C15/04
摘要： PROBLEM TO BE SOLVED: To provide a variable displacement type vane pump capable of easily setting a pump delivery flow and reducing the pump delivery flow with proper characteristics according to the increase of a pump rotation number. SOLUTION: A piston side fluid pressure chamber 31 and a counter-piston side fluid pressure chamber 32 are provided on both sides of a cam ring 5 which can be eccentric to a drive shaft 8, and a control piston 21 contained in a cylinder hole 20a to be capable of expanding/contracting is applied from the side of the fluid pressure chamber 31 to the cam ring 5. In a piston hollow part 21a, a spring 22 to energize the piston 21 to the cam ring 5 is contained. Working fluid from a pump chamber 12 on the delivery side is introduced through a variable orifice 25 of which aperture surface is adjusted by a piston base end side edge 21b into the piston hollow part 21a to be delivered from a delivery port 18 through holes 28, 26 and a communication passage 27. To the fluid pressure chamber 21 in which eccentricity quantity of the cam ring 5 is reduced by enlargement of its volume, upstream pressure of the variable orifice is introduced through a control valve 40.

5. 发明专利

JPH09254796A POWER STEERING DEVICE 失效
公开(公告)号：JPH09254796A
公开(公告)日：1997-09-30
申请号：JP7037696
申请日：1996-03-26
申请人： KAYABA INDUSTRY CO LTD
发明人： KATA KATSUKUNI , HAYASHI MASUMI
IPC分类号： B62D6/00 , B62D5/07
摘要： PROBLEM TO BE SOLVED: To provide a power steering device in which power assist can be obtained in conformity with a handle operating time so as to be excellent in responsiveness. SOLUTION: This power steering device is constituted so that an oil pump 4 supplying hydraulic oil to a power steering cylinder built in a steering gear box 3 is driven by an electric motor 7. In this case, pressure variation of the hydraulic oil due to operation of the power steering cylinder is detected by a pressure sensor, and the rotating speed of the electric motor 7 is controlled based on the detected signal.

6. 发明专利

JPH08282513A POWER STEERING DEVICE 失效
公开(公告)号：JPH08282513A
公开(公告)日：1996-10-29
申请号：JP11505295
申请日：1995-04-17
申请人： KAYABA INDUSTRY CO LTD
发明人： HAYASHI MASUMI , NAGASAKA RYOICHI
IPC分类号： B62D5/07
摘要： PURPOSE: To minimize an energy loss in non-steering by changing he initial load of a spring for a float control valve in steering and non-steering. CONSTITUTION: In non-steering, a moving body 35 is stayed at the position in Fig. to retain a spring 9 under a stretched state. In steering, the pressure of a variable throttle 3 in its upstream is guided to a first pilot chamber 8b. A change-over spool 36 is moved against a spring 46 by using the pressure. Thus, the second pilot chamber 38 is the same as the first pilot chamber 8b in pressure. However, a difference in the pressurised area of the moving body 35 moves the spring 9 in the contracting direction, increasing its initial load.

7. 发明专利

JPH0617748A SWASH PLATE TYPE PUMP MOTOR 失效
公开(公告)号：JPH0617748A
公开(公告)日：1994-01-25
申请号：JP17722292
申请日：1992-07-03
申请人： KAYABA INDUSTRY CO LTD
发明人： HAYASHI MASUMI , NAGASAKA RYOICHI
IPC分类号： F03C1/253 , F03C1/32 , F03C1/34 , F04B1/20
摘要： PURPOSE:To embody miniaturization and weight reduction in the drive shaft direction of a swash plate type pump motor. CONSTITUTION:A swash plate type piston motor is provided with a bearing 6 interposed at a part where a drive shaft 3 penerates a cover 2 of a housing 1 and a bearing 19 for rotatably supporting an outer periphery of a cylinder block 4 to an inner periphery 1C of the housing 1. It is also provided with a spline part 5 for connecting the drive shaft 3 to the cylinder block 4 and a bearing collar 16 interposed at a fitting part of an outer periphery of the drive shaft 3 to an inner periphery of the cylinder block 4.

8. 发明专利

JPS646984B2 失效
公开(公告)号：JPS646984B2
公开(公告)日：1989-02-07
申请号：JP13546580
申请日：1980-09-29
申请人： KAYABA INDUSTRY CO LTD
发明人： KOMAMURA SEIJI , HAYASHI MASUMI , HASHIZUME HIROYUKI
IPC分类号： B62D5/07 , B62D5/06

9. 发明专利

JP2001073961A SEALING STRUCTURE OF VANE PUNP 失效
公开(公告)号：JP2001073961A
公开(公告)日：2001-03-21
申请号：JP24448299
申请日：1999-08-31
申请人： KAYABA INDUSTRY CO LTD
发明人： HAYASHI MASUMI , NAGASAKA RYOICHI
IPC分类号： F04C2/344 , F04C15/00 , F16J15/06
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of defective assembly of a seal ring. SOLUTION: An annular step part 71 formed at the periphery of a pump containing chamber 1a is formed at a housing 1, and a seal ring is nipped between the annular step part 71 and a cover. In the so formed sealing structure of a vane pump, expansion parts 71f and 71r expanding outward from the periphery of the pump containing chamber 1a are formed on a part of the annular step part 71 and seal lock walls 72f and 72r engaged with the inner peripheral part of the seal ring are formed on the inner side of the expansion parts 71f and 71r.

10. 发明专利

JPH09263256A POWER STEERING DEVICE 失效
公开(公告)号：JPH09263256A
公开(公告)日：1997-10-07
申请号：JP7361496
申请日：1996-03-28
申请人： KAYABA INDUSTRY CO LTD
发明人： KATA KATSUKUNI , HAYASHI MASUMI
IPC分类号： B62D6/00 , B62D5/07
摘要： PROBLEM TO BE SOLVED: To provide a power steering device with an excellent resposiveness which can obtain a power assist corresponding to the handle operation at the handle operating time. SOLUTION: In a power steering device 100 in which an oil pump 4 to feed the pressure oil to a power steering cylinder 9 through a power steering valve 8 is driven by an electric motor 7, the variation of the flow rate of the pressure oil passing between the power steering valve 8 and the power steering cylinder 9 is detected by a detecting means (a flow rate sensor 10a or the like) provided between both members, and the rotation frequency of the electric motor 7 is controlled depending on the detecting signal.

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