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1. 发明专利

JP2000055194A WORKING VEHICLE 失效
公开(公告)号：JP2000055194A
公开(公告)日：2000-02-22
申请号：JP22148098
申请日：1998-08-05
申请人： KUBOTA KK , KUBOTA SEIKI CORP
发明人： TAKAGI MASAO , UENISHI SEIJI , OKANO AKIHISA , MACHIDA MASARU , OKAMOTO MUNEHARU , HATTORI AKIO
IPC分类号： B60K20/02 , F16H61/26
摘要： PROBLEM TO BE SOLVED: To provide a working vehicle which can make a simple shifting operation of a main transmission and an aux. transmission using a single shift lever, etc. SOLUTION: A system to make mechanical shifting of an aux. transmission is provided in which a shift lever 10 is turned into a shift range, and a control device is arranged so that, when the lever 10 is turned forward within the shift range, a hydraulic cylinder is operated with a signal from a speed increase switch SwU to shift the main transmission in the direction one step upward, and when the lever 10 is turned backward within the shift range, the hydraulic cylinder is operated with a signal from a speed decrease switch SwD to shift the main transmission in the direction one step down.

2. 发明专利

JPH09242871A TRANSMISSION GEAR FOR WORKING MACHINE 失效
公开(公告)号：JPH09242871A
公开(公告)日：1997-09-16
申请号：JP4579096
申请日：1996-03-04
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HATTORI AKIO
IPC分类号： F16H63/02 , F16H61/28
摘要： PROBLEM TO BE SOLVED: To reduce an arranging space required for reconstruction for compacting a device with light speed change operation kept as it is by reforming a power shift device which carrys out the speed change operation through a hydraulic actuater into an electric control system. SOLUTION: Two hydraulic cylinders 11, 12 for driving a main speed change mechanism for running, two 4-position changing over type solenoid valves 18-21 for conducting the function of the above cylinders 11, 12, and a hydraulic clutch 3 for speed changing are prepared to compose an electric control type power shift device by which the hydraulic clutch 3 is automatically engaged and disengaged with speed changing. The power shift device is composed so that the main speed change mechanism may be speed-changed into four steps by the combination of turning on and off of the solenoid valves 18-21, and in the case where the solenoid valves 18-21 are wholly turned off, the speed change mechanism is set up so as to be operated to the first shift position.

3. 发明专利

JP2648219B2 失效
公开(公告)号：JP2648219B2
公开(公告)日：1997-08-27
申请号：JP1447590
申请日：1990-01-24
申请人： KUBOTA KK
发明人： TAKAGI MASAO , MACHIDA MASARU , MAEIKE KYOSHI
IPC分类号： B60K17/06

4. 发明专利

JPH0972309A OPERATIONAL STRUCTURE FOR DOUBLE ACTING CYLINDER 失效
公开(公告)号：JPH0972309A
公开(公告)日：1997-03-18
申请号：JP23019895
申请日：1995-09-07
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HATTORI AKIO
IPC分类号： F15B15/14 , F15B11/028 , F15B11/16 , F16H61/28 , F16H63/08
摘要： PROBLEM TO BE SOLVED: To simplify operational structure by composing it so as to continually supply working fluid into the first chamber on the side of a piston rod inside a cylinder, and providing a free operatable control valve at a working fluid supply and discharge positions in the second chamber on the opposite side. SOLUTION: When a solenoid control valve 29 is set to a supply position, working oil is supplied to the second chamber 13b, and (the working oil is also already supplied to the first chamber 13a through an oil path 28.) since the pressurized area on the side of the first chamber 13a of a piston 27 is narrower than the pressurized area on the side of the second chamber 13b, the piston 27 moves left to occupy the low speed position of the first auxiliary speed changing device. When the solenoid operation valve 29 is set at an oil discharge position, the working oil in the second chamber 13b is discharged, and the piston 27 is pushed right by the working oil supplied into the first chamber 13a and occupies the high speed position of the first auxiliary speed changing device. Thus a double acting cylinder can be actuated through only one control valve to carry out the supply and discharge operation of the working fluid to the second chamber, and the control valve having a simple structure is sufficient for a double acting cylinder, and therefore the operational structure of the cylinder can be simplified, and its manufacturing cost can be reduced.

5. 发明专利

JP2505622B2 失效
公开(公告)号：JP2505622B2
公开(公告)日：1996-06-12
申请号：JP16626390
申请日：1990-06-25
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HATSUTORI AKIO
IPC分类号： B60W10/02 , B60W10/10 , F16H61/26 , B60K41/22

6. 发明专利

JPH03189472A HYDRAULIC STRUCTURE FOR SPEED CHANGE 失效
公开(公告)号：JPH03189472A
公开(公告)日：1991-08-19
申请号：JP32863989
申请日：1989-12-18
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HAYATA KATSUYA , NAKAMURA MASAYUKI , HATTORI AKIO
IPC分类号： F16H61/28
摘要： PURPOSE:To ease shock at the clutch meeting time by placing a pressure relief valve for discharging supplied pressure oil in connection only when the supplied pressure is within the specified range in the vicinity of clutch meeting pressure, and providing first and second orifices in a pressure oil feed passage and the drain oil passage of the pressure relief valve respectively. CONSTITUTION:A pressure oil feed passage 8 between a hydraulic clutch B and an engine driving pump 7 is provided with a clutch B upstream side part 8a, and a hydraulic pilot type pressure relief valve 15, for discharging a part of supplied pressure oil from the part 8a only when the supplied pressure at the part 8a is within the specified range in the vicinity of clutch meeting pressure, is connected to the part 8a. A first orifice 21 for regulating the operating oil flow to less than the specified quantity is then provided in the pressure oil feed passage 8, and also a second orifice 22 for regulating drain oil quantity to the specified quantity is provided in a drain oil passage 16 from the pressure relief valve 15.

7. 发明专利

JPH03186662A PRESSURE OIL SUPPLY STRUCTURE FOR SPEED CHANGING HYDRAULIC CLUTCH 失效
公开(公告)号：JPH03186662A
公开(公告)日：1991-08-14
申请号：JP32651389
申请日：1989-12-15
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , OKAMOTO MUNEHARU , NAKAMURA MASAYUKI , HATTORI AKIO
IPC分类号： F16H61/28
摘要： PURPOSE:To contrive reduction of the initial charging time, from a clutch off- condition to a clutch meet condition, and suppression of a rapid increase of clutch operating pressure, at the time of clutch meet, by connecting an accumulator to an oil pressure part of a pressure oil supply path between a switching valve and a boost control valve. CONSTITUTION:An accumulator 17, having a capacity almost equal to an oil chamber 16 of a hydraulic clutch B, is connected to an oil path part 8a of a pressure oil supply path 8 between a switching valve 9 and a boost control mechanism. Since this accumulator 17 is placed in a condition that a pressure is always applied through the boost control mechanism F even after setting to a pressure oil supply upper side of the switching valve 9, oil is accumulated. When the switching valve 9 is operated to a clutch-connection side, the accumulated oil is allowed to flow in a side of the hydraulic clutch B because the accumulator 17 communicates with the oil chamber 16 of the hydraulic clutch B, and the clutch meets by performing the initial pressure oil charge without generating a rapid increase of clutch pressure.

8. 发明专利

JPH0356755A HYDRAULIC STRUCTURE FOR SPEED CHANGE 失效
公开(公告)号：JPH0356755A
公开(公告)日：1991-03-12
申请号：JP18911689
申请日：1989-07-21
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HATTORI AKIO
IPC分类号： F16H61/00 , F16D48/02 , F16H61/08 , F16H61/10 , F16H63/46
摘要： PURPOSE:To obtain a smooth connecting characteristic of a hydraulic clutch by providing a switching mechanism switched to the state of returning pressure oil in a pressure oil chamber to a tank and to the state of checking the returning state, in a drain oil path for directly connecting the oil pressure cham ber and the tank. CONSTITUTION:A switching mechanism 35 switches the state of returning pres sure oil in an oil pressure chamber 33 to a tank T or to the state of checking the returning state by the increase and decreases of pilot pressure from a pilot oil path 11 for detecting a speed change start operation. The switching mecha nism is provided in a drain oil path 34 for directly connecting the oil pressure 33 chamber and the tank T. When a speed change operation is started, the pilot pressure to the switching mechanism 35 becomes low so that the pressure oil in the oil pressure chamber 33 is directly discharged to the tank T. Thus, drainage from the oil pressure chamber 33 can be conducted faborably so as to obtain a gradual pressure increasing characteristic as expected.

9. 发明专利

JP2000055195A WORKING VEHICLE 失效
公开(公告)号：JP2000055195A
公开(公告)日：2000-02-22
申请号：JP22148198
申请日：1998-08-05
申请人： KUBOTA KK , KUBOTA SEIKI CORP
发明人： MACHIDA MASARU , OKANO AKIHISA , HATTORI AKIO
IPC分类号： B60K20/02 , B60W10/02 , B60W10/10 , F16H61/26 , B60K41/22
摘要： PROBLEM TO BE SOLVED: To establish a smooth and certain shifting operation in a synchro- meshing gearing system in which shifting is made using a hydraulic cylinder. SOLUTION: This working vehicle is equipped with gearing transmission mechanisms T1-T3 to perform shifting by operating a shifting member with hydraulic cylinders P1-P4, and a control device is arranged so that the oil is exhausted from the cylinders P1-P4 in the shift is not completed within the set time from the start of shifting operation by the cylinders, or the cylinders P1-P4 are operated in the reverse direction and the shift operation force is released temporarily, and then the shifting operation is started again by the cylinders P1-P4.

10. 发明专利

JPH10278602A RUNNING TRANSMISSION STRUCTURE FOR WORKING VEHICLE 失效
公开(公告)号：JPH10278602A
公开(公告)日：1998-10-20
申请号：JP8631797
申请日：1997-04-04
申请人： KUBOTA KK
发明人： MACHIDA MASARU , TAKAGI MASAO
IPC分类号： B60K17/06 , B60K20/02 , F16H59/10
摘要： PROBLEM TO BE SOLVED: To make shifting run smoothly and quickly regardless of the condition of the ground while enabling various work requiring different vehicle speed to be performed without trouble. SOLUTION: A running main speed change unit MA is composed of a main transmission 10 capable of making quadruple speed change by shift gears 11 and 12 and a low speed transmission unit LD capable of making double speed change by the shift gear 31 of an auxiliary transmission 30 which is provided with an overdrive unit OD capable of being geared and ungeared freely by a shift gear 32. When a vehicle is in operation, gear shift can be changed on the low speed side by replacing shift gears 11, 12 and 31 with the overdrive unit OD ungeared. When the vehicle is to be moved, the gear shift can be changed on the high speed side by replacing shift gears 11 and 12. A gear shift restraining device is provided so that the overdrive unit OD shift gear 32 can be geared only when the main transmission 10 and the low speed transmission unit LD are in neutral position.

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