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1. 发明专利

JPS6252255A PRESSURE CONTROL MECHANISM 失效
公开(公告)号：JPS6252255A
公开(公告)日：1987-03-06
申请号：JP19052885
申请日：1985-08-29
申请人： KUBOTA LTD , KUBOTA SEIKI KK
发明人： MACHIDA MASARU , HASEGAWA SHIGEKAZU , OOTA YOSHIMI , FUKUI SATORU , HATTORI AKIO
IPC分类号： F16H61/06 , F16H59/02 , F16H61/08 , F16H61/10
摘要： PURPOSE:To reduce a shock by a clutch in its engaging control, by providing two valve mechanisms, throttle valve and an accumulator to be rationally arranged and setting the pressure for actuating the two value mechanisms. CONSTITUTION:A pressure control mechanism, providing the first valve mechanism 21 switched to a blocking condition if a pilot pressure from the side of an oil hydraulic clutch reaches a predetermined value or more, the second valve mechanism 22 switched to a communicating conditions, when the above described condition is obtained, and a throttle valve 20 parallelly in an oil line 19 for supplying working fluid, connects an accumulator 26 with a confluent oil line of these value mechanisms 21, 22 and throttle valve 20. In this way, the pressure control mechanism, in which the so-called half-clutch condition, generated when the oil hydraulic clutch is controlled to be engaged, can be maintained for a relatively long time by a gentle rise of control pressure, can relax a shock by the clutch when it is engaged.

2. 发明专利

JPH01153848A OPERATING STRUCTURE FOR TRAVELLING OF WORKING VEHICLE 失效
公开(公告)号：JPH01153848A
公开(公告)日：1989-06-16
申请号：JP31365987
申请日：1987-12-10
申请人： KUBOTA LTD , KUBOTA SEIKI KK
发明人： FUKUI SATORU , HATTORI AKIO
IPC分类号： F16H61/30 , F16H63/02 , F16H63/12 , F16H63/24 , F16H63/32
摘要： PURPOSE:To enable a rapid starting operation without need for particularly providing a clutch for the purpose by providing a clutch operating valve mechanism for operating switchover to a clutch engaging condition and a clutch disengaging condition while providing the artificially operating tool of the clutch operating valve mechanism. CONSTITUTION:By steppingly operating a pedal in the maximum step-in position, as a clutch operating valve mechanism V2 is switched over to the disengaging condition of a clutch C2, an operating oil chamber 30 is connected to a tank T releasing the pressurization of a hydraulic piston 29 by a pressure oil to disengage the clutch C2. When the clutch operating valve mechanism V2 is switched over to the engaging condition of the clutch C2, the connection between the operating oil chamber 30 and the tank T is cut off while an oil-pressure control valve mechanism V1 feeds oil into the operating oil chamber 30 in the maximum pressure controlling condition, rapidly carrying out the pressurization of the hydraulic piston 29 by a pressure oil to suddenly engage the clutch C2. That is, the rapid engaging operation of the traveling friction clutch C2 can be carried out regardless of the existence of the oil-pressure control valve mechanism V1 to enable the rapid starting operation of a machine body.

3. 发明专利

JPH01126458A SPEED CHANGE OPERATION STRUCTURE 失效
公开(公告)号：JPH01126458A
公开(公告)日：1989-05-18
申请号：JP28186987
申请日：1987-11-06
申请人： KUBOTA LTD , KUBOTA SEIKI KK
发明人： FUKUI SATORU , HATTORI AKIO
IPC分类号： F16H61/30 , F16H63/00 , F16H63/02 , F16H63/24 , F16H63/32
摘要： PURPOSE:To prevent the occurrence of bad connection and to make the above structure in a compact size by forming a sliding spool of a sequence valve for operating a speed change clutch separately from a piston of a hydraulic cylinder. CONSTITUTION:As hydraulic cylinders 18, 20 operate for releasing the engagement of a shift gear, transmission portions 42a, 42b, 48a, 48b are operated to the side separating from receiving portions 42c, 48c by the cylinder operation. Sequence valves 41, 47 are switches from the clutch-on position to the clutch-off position by urging force of spring S3, S4, whereby a speed change clutch is switched from connection state to disconnection state. As the hydraulic cylinders 18, 20 operate the shift gear to the engagement position, the transmission portions 42a, 42b, 48a, 48b are forced to press the receiving portions 42c, 48c by the above cylinder operation, so that the sequence valves 41, 47 are switched from the clutch-off position to the clutch-off position to switch the speed change clutch from the disconnection state to the connection state.

4. 发明专利

JPH01126459A TRANSMISSION STRUCTURE FOR TRAVELING OF WORKING VEHICLE 失效
公开(公告)号：JPH01126459A
公开(公告)日：1989-05-18
申请号：JP28019287
申请日：1987-11-05
申请人： KUBOTA LTD , KUBOTA SEIKI KK
发明人： FUKUI SATORU , HATTORI AKIO
IPC分类号： F16H61/30 , F16H63/00 , F16H63/02 , F16H63/24 , F16H63/30
摘要： PURPOSE:To enable change of speed in sixteen steps in a compact structure by introducing the turning force into one two-step speed change portion to control speed, and further transmitting same to the other two-step speed change portion to control speed and output same in a farm tractor. CONSTITUTION:A main speed change gear 3 is constructed so that the first and second speed change portions 3a, 3b which can be respectively switched in two steps by the first and second shift gears 11, 12 are connected in series and speed change of four steps is performed by combination of the respective speed steps. The rotation output of the main speed change gear 3 is transmitted through a forward-backward switching device 4 and a speed change clutch C2 to a sub-speed change gear 5. The sub-speed change gear 5 is constructed so that the first and second sub-speed change portions 5a, 5b which can change speed respectively in two steps by the third and fourth shift gears 13, 14 are connected in series and speed change of four steps can be performed by combination of the respective speed steps. That is, as the whole, on the forward side and on the backward side, speed change of sixteen steps can be performed. Thus, the whole transmission can be made in a compact size and speed change can be smoothly performed.

5. 发明专利

JPS6467479A STEERING SYSTEM FOR WORKING CAR 失效
公开(公告)号：JPS6467479A
公开(公告)日：1989-03-14
申请号：JP22245287
申请日：1987-09-04
申请人： KUBOTA LTD , KUBOTA SEIKI KK
发明人： FUKUI SATORU , HATTORI AKIO
IPC分类号： B62D5/07
摘要： PURPOSE:To improve operational ability for steering by driving right and left steering wheels through a respective hydraulic motor, and relatively controlling each variable throttle valve provided on a pair of right and left oil passages interlockingly with the operation of a steering handle to make a difference between the peripheral speeds of the wheels perform steering action. CONSTITUTION:Right and left running wheels 1a, 1b are provided with hydraulic motors Ma, Mb respectively, and each of the motors Ma, Mb is connected to a common hydraulic pump P1 in parallel with each other. Connecting oil passages 11a, 11b between the hydraulic pump P1 and each of the hydraulic motors Ma, Mb are provided with variable throttle valves 12a, 12b respectively. The variable throttle valves 12a, 12b are interlocked with a steering handle 3 so that the operation of the steering handle 3 may make either of the variable throttle valves 12a, 12b function toward a throttling side and the other throttle valve function toward a opening side. Namely, an operating shaft 14 is engaged with oscillating operation arms 13a, 13b of the variable throttle valves 12a, 12b, and linked with a rotary supporting shaft 17 of the steering handle 3 through a reduction transmission gear 15.

6. 发明专利

JPS6252252A HYDRAULICALLY CONTROLLED TRANSMISSION 失效
公开(公告)号：JPS6252252A
公开(公告)日：1987-03-06
申请号：JP19233885
申请日：1985-08-30
申请人： KUBOTA LTD , KUBOTA SEIKI KK
发明人： FUKUI SATORU , HASEGAWA SHIGEKAZU , MACHIDA MASARU , HATTORI AKIO
IPC分类号： F16H63/00 , F16H63/02 , F16H63/24 , F16H63/32
摘要： PURPOSE:To reduce a time required for the speed change of a car while it is in running, by decreasing a quantity of pressure oil in-out circulated through an accumulator when the car in running motion performs a speed change. CONSTITUTION:A transmission, providing a selector valve 17 between a pressure control mechanism 16 and a speed change oil hydraulic clutch C, switches the clutch to its engagement and disengagement conditions by said selector valve 17. While the second oil path 23, communicating with an accumulator 22, is connected in the half way of the first oil path 21 connecting the selector valve 17 with the speed change oil hydraulic clutch C. Further passage resistance of the second oil path 23 is set larger than the passage resistance of the first oil path 21. By this constitution, a time required for a speed change in a car while in running can be reduced.

7. 发明专利

JPH0220210A FRAME STRUCTURE IN RIDING TYPE LAWN MOWER 失效
公开(公告)号：JPH0220210A
公开(公告)日：1990-01-23
申请号：JP16947188
申请日：1988-07-07
申请人： KUBOTA LTD
发明人： HASEGAWA SHIGEKAZU , OTA YOSHIMI , FUKUI SATORU
IPC分类号： A01D34/64 , A01D34/68
摘要： PURPOSE:To provide the title frame structure so designed that the intermediate part of the front and rear of a machine body frame supported by both the front and rear wheels is formed in an expanded manner outward, and a mower is inserted into a midway of this frame, thereby preventing said mower from being broken. CONSTITUTION:A machine frame 3 is made of iron pipe, jointing itself in a loop fashion for higher mechanical strength. The intermediate part of the front and rear of this frame 3 is formed in an expanded manner outward, and a mower is inserted into a midway of this expanded part 3a. Said expanded part 3a is formed in an arc manner along the circumferential surface of the mower, and with this expanded part 3a, the side of the mower is guarded from external objects.

8. 发明专利

JPS6338578B2 失效
公开(公告)号：JPS6338578B2
公开(公告)日：1988-08-01
申请号：JP19951582
申请日：1982-11-13
申请人： KUBOTA LTD
发明人： FUKUI SATORU
IPC分类号： B60K20/00 , F16H61/02 , F16H61/08 , F16H61/30 , F16H63/00 , F16H63/02 , F16H63/24 , F16H63/30 , F16H63/32 , F16H63/34

9. 发明专利

JPS6331022B2 失效
公开(公告)号：JPS6331022B2
公开(公告)日：1988-06-22
申请号：JP11955281
申请日：1981-07-29
申请人： KUBOTA LTD
发明人： FUKUI SATORU
IPC分类号： F16H63/12 , F16H63/24 , F16H63/30

10. 发明专利

JPS6049156A HYDRAULIC OPERATION TYPE TRAVEL SPEED CHANGER 失效
公开(公告)号：JPS6049156A
公开(公告)日：1985-03-18
申请号：JP15526083
申请日：1983-08-24
申请人： KUBOTA LTD
发明人： FUKUI SATORU , OOTA YOSHIMI , OKITA NAOKI
IPC分类号： B60K20/00 , B60K17/10 , F16H61/00 , F16H61/06 , F16H61/28 , F16H63/02 , F16H63/12 , F16H63/24
摘要： PURPOSE:To enable a speed change at a high speed by providing an accumulator of the captioned speed changer so as to discharge the pressure oil to the oil passage portion upstream speed change control valves during the speed change operation and to store the pressure oil fed to transmission clutch operation hydraulic cylinders. CONSTITUTION:In a travel speed changer provided with multiple gear speed changers and transmission clutches in series on a travel transmission system, speed change control valves V1, V2 for speed change shifter operation hydraulic cylinders of individual gear speed changers and clutch control valves S1, T1-T3 for transmission clutch operation cylinders are provided. Individual valves S1, T1-T3 are automatically transferred during the speed change operation so that they are transferred to the operation position only under the transmission condition of the gear speed changers. An accumulator A is provided so as to discharge the pressure oil to the oil passage portion upstream the control valves V1-V2 during the speed change operation and to store the pressure oil fed from the valves S1, T1-T3 to the transmission clutch operation hydraulic cylinders.

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