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1. 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.

2. 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.

3. 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

4. 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.

5. 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.

6. 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.

7. 发明专利

JPH04357367A HYDRAULIC CIRCUIT STRUCTURE OF SERVICE CAR 失效
公开(公告)号：JPH04357367A
公开(公告)日：1992-12-10
申请号：JP12812291
申请日：1991-05-31
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HATTORI AKIO , NAKAMURA MASAYUKI
IPC分类号： B60K17/28 , B60W10/02 , B60W10/10 , B60W10/12 , F16H61/28 , F16H63/00
摘要： PURPOSE:To ensure a stable speed change operation by enabling pressurized oil to be preferentially supplied to hydraulic cylinder and hydraulic clutch sides for traveling speed change when the hydraulic cylinder and clutch for the travel ing speed change and a hydraulic clutch of PTO system are operated by a single pump. CONSTITUTION:A transmission system of an agricultural tractor transmits the power from an engine 1 to the rear wheel side differential mechanism through a main speed change gear, multiple disk hydraulic clutch 3, forward and backward change-over device and sub-speed change gear, and transmits the power branched from the right front of the differential mechanism to the front wheel side differential mechanism 5a. The shift gears of main and sub- speed change gears are operated respectively by first-third hydraulic cylinders 11-13. Here is provided a controlling valve 35 for controllably putting working oil in and out of the hydraulic clutch 3 alomg with the operation of the respective hydraulic cylinders 11-13. The controlling valve 35 is connected to a first oil path 17 branched from the main oil path 36 while a throttle section 45 is provided in a second oil path 18 to be connected to the hydraulic clutch 7 of a PTO system.

8. 发明专利

JPH03186660A PRESSURE OIL SUPPLY STRUCTURE FOR SPEED CHANGING HYDRAULIC CLUTCH 失效
公开(公告)号：JPH03186660A
公开(公告)日：1991-08-14
申请号：JP32651189
申请日：1989-12-15
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , OKAMOTO MUNEHARU , HATTORI AKIO , NAKAMURA MASAYUKI
IPC分类号： F16H61/00 , F16H61/02 , F16H61/06 , F16H61/28 , F16H63/46
摘要： PURPOSE:To promptly perform speed change operation with a charging time shortened by providing an orifice in a residual oil discharging oil path of a switching valve, in the case of a pressure oil supply structure for a speed changing hydraulic clutch. CONSTITUTION:In the case of a pressure oil supply structure for a speed changing hydraulic clutch B, an orifice 23 is provided in a residual oil discharging oil path 22 of a selector valve 9. By this constitution, when a speed change is operated during running of a machine body, after the selector valve 9 is selected from a clutch in-condition to a clutch off-condition, the valve is set again to the clutch in-condition, but when the valve is selected to the clutch off-condition, operating oil in the hydraulic clutch B is discharged by the orifice 23 while limiting a flow amount. Accordingly, when the valve is set again to the clutch in-condition, oil is placed in a condition that it is partly left in the hydraulic clutch B. As a result, the initial charging amount of pressure oil, at the time of resetting to the clutch in-condition, is less required than in the past, and a speed change operation can be promptly performed by reducing the charging time.

9. 发明专利

JPH03186659A PRESSURE OIL SUPPLY STRUCTURE OF SPEED CHANGING HYDRAULIC CLUTCH 失效
公开(公告)号：JPH03186659A
公开(公告)日：1991-08-14
申请号：JP32528189
申请日：1989-12-14
申请人： KUBOTA KK , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , OKAMOTO MUNEHARU , HATTORI AKIO , NAKAMURA MASAYUKI
IPC分类号： F16H61/28 , F16D48/02
摘要： PURPOSE:To make a prompt speed change operation possible with a transmitting shock moderated, at the time of clutch meet, by connecting, in parallel to a boost control valve, a pressure reducing valve, which permits passing of pressure oil only at a preset pressure or less a little lower than a meet pressure at the time of starting contact of a hydraulic piston with a transmitting friction plate. CONSTITUTION:A pressure reducing valve 21, which permits passing of pressure oil only at a preset pressure or less a little lower than a meet pressure at the time of starting contact of a hydraulic piston of a hydraulic clutch B with a transmitting friction plate, is parallelly connected to a boost control valve F. Thus, even in the case of setting the boost control valve F to start boost action from a relatively low pressure, when the clutch is in connecting action, pressure oil is supplied to the hydrau lic clutch B through the pressure reducing valve 21 almost without draining during the time until a clutch pressure is increased to the preset pressure. Consequently, the initial charge of the pressure oil of the hydraulic clutch B is quickly performed. Also, when the clutch pressure exceeds the preset pressure, the pressure reducing valve 21 is closing-actuated with a smooth boost control by the boost control valve F executed, and a rapid rise of the clutch pressure, at the time of meet, can be relaxed.

10. 发明专利

JPH09242867A TRANSMISSION GEAR FOR WORKING MACHINE 失效
公开(公告)号：JPH09242867A
公开(公告)日：1997-09-16
申请号：JP4578996
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： B60W10/02 , B60W10/10 , B60W10/11 , B60W10/18 , F16D48/02 , F16H61/16 , B60K41/26
摘要： PROBLEM TO BE SOLVED: To organically combine a technique for tow-controlling so as to be unable to travel during braking for parking as an electric control type transmission is adopted. SOLUTION: A driving operation type transmission He equipped with a hydraulic cylinder for operating a main speed change mechanism and the first subspeed change mechanism on a speed change command sent from a main speed change lever 26 is composed, and a departure locking means F is provided for controlling so that a speed change mechanism may be turned into a transmitting state so as to transmit power to a wheel only in the case where the main speed change lever 26 is changed over to a speed change position as a parking brake lever 23 is set at a releasing position from a state where a parking brake is in a nonfunction state, and the main speed change lever 26 is at a neutral position is provided.

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