JP3155473B2 - Vehicle hydraulic operating system warming mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warming mechanism for a hydraulic operating section of a civil engineering or construction vehicle.

[0002]

2. Description of the Related Art In civil engineering and construction vehicles, for example, backhoes, a swivel is mounted on a traveling machine platform having left and right crawler traveling devices, and an engine and an excavator are mounted on the swivel. The crawler traveling device and the swivel table are driven by a hydraulic motor, and the boom, arm and bucket of the excavator are driven by a hydraulic cylinder, and these hydraulic actuators are driven by hydraulic oil from a hydraulic pump driven by an engine. The pressure oil is controlled by a control valve.

A control valve is provided for each actuator and is arranged in a swivel. Some of the control valves are connected to an operation valve in an operation box provided on the swivel through a pilot oil passage. The control valve is operated and controlled by operating the operation valve with an operation lever or the like. The control valve forms a valve block by stacking 8 to 10 valves, and the control valve accommodates (or forms) 8 (or 4 pairs of 2) in a metal block, or controls Like the valve, it is superimposed and placed in the block.

When the vehicle is started, when the temperature of the hydraulic oil is low or when the hydraulic equipment is cold (particularly in winter), the viscosity of the hydraulic oil flowing in the hydraulic operating unit is low, and The warm-up operation must be performed for a sufficient time until the operation response of the actuator becomes dull and the temperature of the hydraulic oil rises to a temperature at which the required viscosity is reached. Therefore, a pressure oil circulation passage (which is closed when the spool moves from the neutral state) is formed in the control valve block so that the pressure oil from the hydraulic pump flows even when the control valve is not operated. Therefore, a structure is adopted in which the control valve block is heated with pressure oil.

[0005]

Conventionally, the control valve block is heated relatively quickly, but the operating valve block is not heated by pressure oil. This is a structure in which the operation valve is directly operated by the operation lever and only supplies pilot pressure oil.It is arranged in a narrow space inside the operation box, and a small and inexpensive valve is used. This is because it is difficult to form a pressurized oil circulation flow path.

However, since the operation valve block is easy to cool and the pilot oil passage is long and narrow, rapid warming of the hydraulic oil at low temperatures is required. The present invention forms a warm air flow path in a valve block containing an operation valve, and circulates cooling water or engine oil of a radiator through the warm air flow path, so that the valve block of the operation valve can be quickly turned on at the time of starting vehicle operation. It is an object of the present invention to provide a warm-up mechanism for a hydraulic operating section of a vehicle that can warm up.

[0007]

A first concrete means for solving the problems in the present invention is a hydraulic pump 3 driven by an engine 2 and a supply of hydraulic oil from the hydraulic pump 3 to a plurality of actuators. A plurality of control valves 4 and operating valves 5 respectively operating the plurality of control valves 4 with pressure oil from the hydraulic pump 3, and a valve block 6 containing the operating valves 5.
A radiator 12 for the engine 2 is connected to the warm air passage 7 so as to circulate the cooling water of the engine 2 through the warm air passage 7.

Thus, the cooling water warmed by the radiator 12 is allowed to flow through the warm air passage 7 into the valve block 6, and the cooling water is used by the operating valve 5 and between the operating valve 5 and the control valve 4. Warm pilot oil passage. The second specific means for solving the problem in the present invention is a hydraulic pump 3 driven by the engine 2, a plurality of control valves 4 for supplying hydraulic oil from the hydraulic pump 3 to a plurality of actuators, An operating valve 5 for operating each of the plurality of control valves 4 with pressure oil from the pump 3; a warm air flow path 7 is formed in a valve block 6 accommodating the operating valve 5; That is, the oil pan 11 of the engine 2 and the warm air passage 7 are connected so as to circulate through the engine 7.

As a result, the engine oil warmed by the engine 2 is allowed to flow through the warm air passage 7 into the valve block 6, and the engine oil is used to operate the operating valve 5 and the operating valve 5.
The pilot oil passage between the valve and the control valve 4 is warmed. A third specific means for solving the problem in the present invention is a temperature sensing closure for closing the warm air flow path 7 when the valve block 6 reaches a required temperature in addition to the first or second specific means. That is, the means 13 is provided.

Thus, when the temperature of the operation valve 5 reaches a required temperature, the warm air passage 7 is closed to prevent overheating, and the load of flowing engine oil or cooling water through the warm air passage 7 is reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 5, reference numeral 15 denotes a so-called small ultra-small turning type backhoe exemplified as a vehicle. The backhoe 15 has a pair of crawler traveling devices 17 on the left and right of a traveling machine base 16, and is mounted on the traveling machine platform 16. A substantially circular swivel 18 is rotatably mounted around the longitudinal axis, a drilling device 19 is mounted on the front right side of the swivel 18, and a control box 20 is disposed on the upper left front, and a rear of the control box 20. A driver's seat 21 is arranged in the vehicle, a sunshade device 22 for covering the driver's seat 21 is provided on the swivel 18, and the dozer 23 is arranged to protrude forward from the traveling machine base 16.

The diameter of the turntable 18 is set to be equal to or less than the distance between the outer ends of the left and right crawler traveling devices 17, and the excavator 19 is folded and stored so as not to protrude from the turntable 18. The crawler traveling device 17 is driven by a hydraulic motor 26, the swivel 18 is driven by a hydraulic motor (not shown), and the dozer 23 is movable up and down by a hydraulic cylinder 27.

The excavator 19 is supported by the swivel table 18 so as to be vertically swingable, and is swingable by a boom cylinder 28. The excavator 19 is connected to the tip of the boom 29 via an intermediate support shaft. An intermediate boom 31 oscillated by the offset cylinder 30, a tip boom 33 connected to the tip of the intermediate boom 31 via a tip support shaft, and connected to the base boom 29 via a link link 32;
An arm 35 connected to the distal end boom 33 via a horizontal axis and oscillated by an arm cylinder 34, and a bucket 37 connected to the distal end of the arm 35 via a horizontal axis and dumped by a bucket cylinder 36 are provided. Have.

The engine 2 is mounted on the rear portion of the swivel 18. The engine 2 has an oil pan 11 and a radiator fan for cooling the radiator 12 on one side.
A hydraulic pump 3 driven by a crankshaft is provided on the other side of the engine 2, a driver's seat 21 is disposed on a bonnet 40 that covers the hydraulic pump 3, and a fuel tank and an oil tank 9 are mounted on the right side of the swivel 18. Have been.

In the first embodiment shown in FIGS. 1 and 2, the hydraulic pump 3 comprises, for example, four hydraulic pumps 3.
A, 3B, 3C, 3D, hydraulic pumps 3A, 3B,
Reference numeral 3C denotes a triple pump, which controls the control valve 4 which constitutes a hydraulic operating unit at the front of the swivel 18 via a working oil passage 39 (shown by a solid line in FIGS. 1 and 2) through the oil sucked from the oil tank 9. And the operation valve 5. Oil discharged from each control valve 4, relief valve, and the like is returned to the oil tank 9 via an oil drain 8 (shown by a dashed line in FIGS. 1 and 2). The oil drained from the operation valve 5 is returned to the oil tank 9 via an oil drain as appropriate.

The control valve 4 is disposed at a front portion in the swivel table 18.
1, and the arrangement is such that the control valve 4A for the arm cylinder 34, the control valve 4B for the left traveling motor 26, the control valve 4C for the service port, the control valve 4D for the right traveling motor 26, and the Control valve 4E, control valve 4F for boom cylinder 28, control valve 4G for swing motor, control valve 4H for offset cylinder 30, dozer cylinder 27
Control valve 4J. The arrangement of the control valve 4 can be changed as appropriate, and a control valve for switching the traveling motor 26 from a low speed to a high speed may be added.

The hydraulic oil from the hydraulic pumps 3A, 3B, 3C is sent to the actuator supply ports of all the control valves 4A to 4J via the hydraulic oil passage 39, and can operate four actuators at the same time. Even when the motor 26 is in the straight running state, the actuators such as the turning motor, the offset cylinder 30 and the dozer cylinder 27 can be operated.

A circulation flow path 10 is formed through all (or a part of) the control valves 4A to 4J.
Pressure oil is supplied from the hydraulic pumps 3. The control valve 4 is warmed up at the start of operation by the pressure oil flowing through the circulation flow path 10. The circulation flow path 10 is closed when the spool is moved by operating the control valve 4 from the neutral state.

The operation valves 5 are arranged in the control box 20. For example, eight operation valves are arranged in the valve block 6, and are switched by swinging the two operation levers 43R and 43L back and forth and right and left. Operated, four control valves 4
A, 4E, 4F and 4G are connected to the pilot oil passage 47 (FIGS. 1 and 2).
(Indicated by a chain line). The other five control valves 4B, 4C, 4D, 4H, 4J, etc. are manually operated by operating levers or foot pedals.

The arrangement of the operation valves 5 is sequentially operated from the right by swinging the right operation lever 43R back and forth and the control valve 4F
Boom vertical movement operation valve 5A, bucket dump / plowing operation valve 5B, left operation lever 4 which is operated by right and left swing of right operation lever 43R and connected to control valve 4E.
Arm dumping / peking operation valve 5C, which is operated by 3L back-and-forth swing and connected to control valve 4A, left operation lever 43L
, And a turntable left / right rotation operation valve 5D connected to the control valve 4G. The forward and backward swings and the left and right swings of the left and right operation levers 43R and 43L may be set in reverse.

The pressure oil from the hydraulic pump 3D is supplied to the working oil passage 3
9 and all the operation valves 5A to 4D via the electromagnetic switching valve 44
When the required operation valve 5 is opened by the left and right operation levers 43R and 43L, the pressure in the pilot oil passage 47 of the opened operation valve 5 rises and is connected to the pilot oil supply port. The control valve 4 is switched and controlled.

The valve block 6 is made of an aluminum casting, a cast iron casting, or a metal such as other metals or alloys, and has an operating valve 5 formed or inserted therein. One or a plurality of warm air passages 7 are formed so as to surround. This warm air passage 7
Are connected to the cooling water passage of the radiator 12, and the cooling water flowing by the water pump of the radiator 12 passes through the warm air flow path 7.
The cooling water of the radiator 12 is heated by the heat of the engine 2, and the heated cooling water is allowed to flow through the warm-up channel 7 to warm up the operation valve 5.

A connecting pipe 48 connecting the warm air flow path 7 and the radiator 12 is provided with an electromagnetic on-off valve 49, and the valve block 6
Are provided with a temperature sensor 50, and these constitute a temperature sensing closing means 13. As the temperature sensing closing means 13, a thermostat may be used. The temperature sensing / closing means 13 detects that the temperature of the valve block 6 has reached a required temperature (for example, 40 to 50 degrees) by the temperature sensor 50, activates the electromagnetic on-off valve 49, and moves to the warm air passage 7. After the flow of the cooling water is stopped and the operation valve 5 is warmed up, the flow of the cooling water to the warming flow passage 7 is stopped to prevent the hydraulic operating section from being overheated and reduce the load. Is to do so.

The temperature sensor 50 may be provided in the warm air flow passage 7, the pilot oil passage 47, the connection pipe 48, or the like. The temperature at which the oil temperature in the pilot oil passage 47 reaches the required temperature at each of these positions. May be operated to close the electromagnetic on-off valve 49. 45 is a check valve provided near the oil filter of the oil drain passage 8 to prevent cavitation when sucking oil from the oil tank 9, and 46 is a check valve from the hydraulic pump 3D when the operation lever 43 is not operated. This is a relief valve that releases pressurized oil.

In the second embodiment shown in FIGS. 3 and 4, the warm air passage 7 in the valve block 6 has the engine 2 at both ends.
Is connected to the oil pan 11 via a connection pipe 48, and the engine oil in the oil pan 11 passes through the warm air flow path 7. At the start of operation, the engine oil is heated by the heat of the engine 2. Then, the operation valve 5 can be warmed by flowing the heated engine oil through the warm air passage 7.

The connection pipe 48 is provided with an oil pump 51 as the temperature sensing and closing means 13, and the valve block 6 is provided with a temperature sensor 50. The pump 51 is stopped to stop the flow of the engine oil to the warm air passage 7. The configurations of the hydraulic pump 3, the control valve 4, the operation valve 5, and the like of the second embodiment are substantially the same as those of the first embodiment.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
The number of the hydraulic pumps 3 may be plural or one other than four, and the control valve 4 and the operating valve 5 may be plural.

[0028]

According to the present invention described in detail above, the operation valve 5
The radiator 12 for the engine 2 is connected to the warm air flow path 7 so as to circulate the cooling water of the engine 2 through the warm air flow path 7 because the warm air flow path 7 is formed in the valve block 6 containing
Cooling water warmed by the radiator 12 flows through the warm air flow path 7 into the valve block 6, and the cooling water
In addition, the pilot oil passage 47 and the like between the operation valve 5 and the control valve 4 can be warmed.

A warm air passage 7 is formed in a valve block 6 in which the operation valve 5 is housed, and an oil pan 11 of the engine 2 and the warm air passage 7 are connected to circulate engine oil through the warm air passage 7. Therefore, the engine oil warmed by the engine 2 is circulated through the warm air passage 7 into the valve block 6, and the engine oil is used for the pilot oil between the operation valve 5 and the operation valve 5 and the control valve 4. The road 47 and the like can be heated.

Further, a temperature sensing closing means 13 for closing the warm air passage 7 when the valve block 6 reaches a required temperature.
Is provided, when the operation valve 5 reaches a required temperature, the warm air flow path 7 is closed to prevent overheating, and to reduce the load of cooling water or engine oil flowing through the warm air flow path 7. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing the main part.

FIG. 3 is an explanatory diagram showing a second embodiment.

FIG. 4 is a schematic explanatory view showing the main part.

FIG. 5 is a perspective view of a backhoe.

[Explanation of symbols]

 2 Engine 3 Hydraulic pump 4 Control valve 5 Operating valve 6 Valve block 7 Warm air passage 8 Drainage passage 9 Oil tank 10 Circulation passage 11 Oil pan 12 Radiator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02F 9/00 E02F 9/20 F01P 3/20 F02D 29/04

Claims (3)

(57) [Claims] A hydraulic pump (3) driven by an engine (2), a plurality of control valves (4) for supplying hydraulic oil from the hydraulic pump (3) to a plurality of actuators, and a hydraulic pump (3). And a control valve (5) for operating each of the plurality of control valves (4) with the pressure oil from (1), and a warm air flow path (7) in a valve block (6) containing the control valve (5). Forming
A radiator (12) for the engine (2) and a warm air passage (7) are connected to circulate the cooling water of the engine (2) through the warm air passage (7). Operation section warming mechanism. 2. A hydraulic pump (3) driven by an engine (2), a plurality of control valves (4) for supplying hydraulic oil from the hydraulic pump (3) to a plurality of actuators, and a hydraulic pump (3). And a control valve (5) for operating each of the plurality of control valves (4) with the pressure oil from (1), and a warm air flow path (7) in a valve block (6) containing the control valve (5). Forming
A warm-up mechanism for a hydraulic operating section of a vehicle, wherein an oil pan (11) of an engine (2) and a warm-air passage (7) are connected to circulate engine oil through a warm-air passage (7). 3. A temperature sensing closing means (13) for closing a warm air passage (7) when said valve block (6) reaches a required temperature.
The warming-up mechanism for a hydraulic operating section of a vehicle according to claim 1.