Hydraulic Valve Equipment of Working Vehicle
a technology of working vehicle and hydraulic valve, which is applied in the direction of mechanical equipment, machines/engines, transportation and packaging, etc., can solve the problems of unstable control, change of control pressure of oil, and modularization of pto valve equipment, so as to reduce the loss of oil pressure, manage and control oil pressure, and improve responsibility
Inactive Publication Date: 2008-02-14
YANMAR CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
This solution stabilizes oil pressure control, simplifies maintenance, reduces the lateral width of the control valve equipment, and enhances the heat radiation ability, thereby improving the reliability and maintainability of the PTO valve equipment while reducing production costs.
Problems solved by technology
However, with regard to the PTO rear cover attached to power take off equipment of the working vehicle, the modularization of the PTO valve equipment is not considered, and the switching from a mechanical PTO clutch to a hydraulic PTO clutch is not considered.
Since the conventional PTO valve equipment is positioned far from the PTO clutch mechanism, oil pressure is lost in a piping and the like between the PTO valve equipment and the PTO clutch mechanism, whereby control pressure of oil is changed and the control is unstable.
However, since the valves are arranged laterally, the lateral width of the conventional control valve equipment is large.
Furthermore, the equipment comprises plural members, whereby it is difficult to construct the equipment compactly.
Accordingly, if the lateral width of the control valve equipment is large, the capacity of the fuel tanks arranged left and right sides of the vehicle body frame cannot be increased.
This work is troublesome because the fuel tanks are arranged left and right sides of the vehicle body frame.
Even if the valves are disposed on the side surface of the control valve equipment and along the lateral direction of the vehicle body frame, it is not easy to remove the valves.
Accordingly, The production process becomes complex so as to form the opening separately, thereby improving the production cost.
Method used
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Embodiment Construction
[0065] Firstly, explanation will be given on entire construction of a tractor of the present invention.
[0066] As shown in FIG. 1, a vehicle body housing of the tractor is constructed by providing a front housing 1, a middle housing 2 and a rear housing 3 adjacently longitudinally. A support wall 1a is provided integrally at the middle of the front housing 1. A first bearing frame 4a is attached and supported to the substantial longitudinal middle portion of the portion of inside of the front housing 1 behind the support wall 1a. A second bearing frame 4b is attached and supported to the rear end of the front housing 1. The second bearing frame 4b may alternatively be attached and supported to the front end of the middle housing 2.
[0067] A support wall 2a is provided integrally at the middle of the middle housing 2. The rear housing 3 comprises a front wall 3a, a support wall 32 at the middle, and a PTO rear cover 3c closing an opening of the rear end. An engine flywheel 6 is posit...
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With regard to the present invention, valves are modularized so as to improve operativity, and the valves are formed by one member and changed the arrangement thereof so as to be miniaturized, thereby making the maintain work easy. Namely, a PTO rear cover 3c, in which a PTO driving mechanism having a PTO clutch 28 is housed, is attached to a rear end of a rear housing 3 of a vehicle body, PTO valve equipment 72 controlling on / off of the PTO clutch 28 is provided integrally with the PTO rear cover 3c, and an oil passage communicating the PTO valve equipment 72 with the PTO clutch 28 and a hydraulic port are formed in the inside of the PTO rear cover 3c. A plurality of valves is provided so as to control operation of a forward / rearward travel selector 210 and fixed to one of side surfaces of a front housing 201, an attachment member 281 formed by one plate-like member touches the vehicle body housing 201, and the valves are arranged on substantial same plane in parallel to the touching surface.
Description
TECHNICAL FIELD [0001] The present invention relates to hydraulic valve equipment of a working vehicle. More particularly, the present invention relates to an art that layout of valves are changed so as to make the construction compact while improving operativity, thereby making exchange and maintenance of the valves easy. BACKGROUND ART [0002] Conventionally, as described in the Patent Literature 1 for example, there is well known PTO valve equipment of a working vehicle. With regard to the PTO valve equipment described in the Patent Literature 1, a rear end of a rear housing of a vehicle body is covered by a PTO rear cover, and the PTO rear cover supports tips of a brake support shaft of a brake braking a clutch housing of a PTO clutch, a clutch shaft and a PTO shaft so as to construct a sub assembly. Accordingly, the sub assembly is built in the vehicle body simultaneously with attaching the PTO rear cover to the rear end of the rear housing. [0003] However, with regard to the PT...
Claims
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IPC IPC(8): F16D48/02F16H57/02F16H61/00B60K17/28B60K25/06
CPCB60K17/28B60K25/06F15B13/0814F15B13/0835F16H61/0009F16H57/02F16H61/0246F16H2057/02013F16D48/02F16D2048/0281F16D2500/1026F16D2500/1112F16D2500/70406Y10T137/6851Y10T137/6855F16H2200/0034F16H3/089F16H2003/0818
InventorMATSUFUJI, MIZUYA
OwnerYANMAR CO LTD