JP2002276618A - Travel heat device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a travel heat device using a usual travel motor, having high temperature rise effect, less management cost and versatility. SOLUTION: One of drain ports 21a, 22a of the hydraulically driven travel motors 1R, 1L is connected to a tank as usual and the other is connected to a pilot hydraulic source line 37, and a solenoid change valve 7 is provided in a pipeline therebetween. Thus, the solenoid change valve 7 can be switched by a warm-up switch 45. A pressure switch 48 is provided for detecting an operation pilot pressure of each travel motor to cause the solenoid change valve 7 to be switched so that the supply of an operating oil to the drain ports 21a, 22a is cut when the pressure switch 48 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine having a traveling motor driven by hydraulic pressure, and more particularly to a traveling heat device for a construction machine which improves the startability of a traveling motor in a cold region.

[0002]

2. Description of the Related Art An example of a construction machine is a hydraulic shovel. In this hydraulic excavator, an upper swing body is installed on a lower traveling body so as to be able to swing. The upper swing body is provided with a driver's cab and a front working machine. The front working machine includes a front attachment such as a boom, an arm, and a bucket. When a bucket is used as the front attachment, for example, excavation of earth and sand is performed. In addition, a crawler-type traveling device is generally provided on the lower traveling body symmetrically.

[0003] The traveling of the lower traveling body and the turning operation of the upper rotating body are performed by a hydraulic motor, and the operation of a boom, an arm and a bucket constituting the front working machine is performed by a hydraulic cylinder. As described above, the driving means of the hydraulic shovel is constituted by a hydraulic actuator including a hydraulic motor and a hydraulic cylinder.

A hydraulic excavator usually works outdoors, and after one day's work, the excavator is kept in the work place until the next work is started. . For example, if the excavator is disposed for a long time with the excavator stopped in a situation where the ambient temperature is extremely low, such as in a cold region, the entire excavator drops to the same temperature as the ambient temperature. For this reason, the temperature of the engine, its cooling water, and the engine oil installed in the hydraulic excavator also decreases, and in this state, the engine startability deteriorates. Further, in such a state, the hydraulic oil for operating the hydraulic actuator also has a high viscosity, and the flow becomes extremely poor.

[0005] In consideration of the above points, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application Publication No. 0-27402, a heater is installed to warm the engine to improve the engine startability, and the main pump is started by turning the engine at idling to circulate the hydraulic oil, and the operating oil temperature is increased. Is rising.

[0006]

However, the above prior art has the following problems.

In the prior art described in Japanese Patent Application Laid-Open No. 10-27402, the engine is warmed as described above to improve the engine startability. In addition, the main pump is started by turning the engine at idling to circulate the hydraulic oil and raise the hydraulic oil temperature. However, the idling of the engine alone cannot warm up the hydraulic actuator.

The hydraulic cylinder that drives the front working machine can be warmed up by starting slowly without damaging the hydraulic cylinder. However, in the traveling device, the piston for driving the traveling motor is small and is driven at a high speed. Therefore, it is difficult to drive the piston slowly, and it is difficult to warm up the traveling device. In particular, there is a possibility to provide a passage for hydraulic oil for traveling heat on the casing side of the traveling motor to warm up the traveling motor, but in this case, it is necessary to newly produce the traveling motor itself, which leads to production costs and management. Expenses will increase. Further, since the working oil does not flow directly into the traveling motor, the effect of increasing the temperature is small.

An object of the present invention is to provide a versatile traveling heat apparatus which uses a commonly used traveling motor, has a high temperature raising effect, reduces management costs and the like.

[0010]

(1) In order to achieve the above object, the present invention provides a traveling heat device for a construction machine having a traveling motor driven by hydraulic pressure, and the traveling motor having two drain ports. , One of the two drain ports of the traveling motor is connected to a tank, and the other is connected to a pilot hydraulic power source.

By connecting one of the two drain ports of the traveling motor to the pilot hydraulic source in this way, the operating oil of the pilot hydraulic source flows into the traveling motor, so that the temperature increasing effect is high, and The motor can be warmed up effectively. In addition, since the excess drain port of the two drain ports is used, the conventional traveling motor can be used as it is, and there is no need to manufacture a dedicated traveling motor.
Management costs can be reduced. In addition, a versatile traveling heat device can be provided. Furthermore, since the extra drain port is used, the existing machine can be remodeled without much trouble.

(2) In the above (1), preferably,
A switching valve is provided in a pipe connecting another drain port of the traveling motor to a pilot hydraulic power source, and a warm-up switch is provided at a position operable by an operator, and the switching valve is switched by the warm-up switch.

Thus, it is possible to select whether or not to warm up according to the operator's will.

(3) In the above (1), preferably, a switching valve is provided in a pipe connecting another drain port of the traveling motor to a pilot hydraulic pressure source, and the drive of the traveling motor is detected. A travel detection switch is provided, and when the travel detection switch detects the drive of the travel motor, the switching valve is switched so as to shut off the supply of hydraulic oil.

[0015] Thus, it is possible to prevent the build-up pressure generated when the operating oil for warming is supplied during the driving of the traveling motor, and to prevent the failure of the traveling motor due to the heating device.

(4) In the above (3), preferably,
The running detection switch is a pressure switch that detects the operating pilot pressure for running.

This makes it possible to hydraulically detect the driving of the traveling motor.

(5) In the above (1), preferably, the two drain ports of the traveling motor are arranged up and down, the upper drain port is connected to the tank, and the lower drain port is connected to the pilot hydraulic power source. Connect to

This makes it easier for the hydraulic oil flowing from the drain port to reach the entire interior of the traveling motor, and to effectively warm up the traveling motor.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a traveling heat device of a hydraulic shovel according to an embodiment of the present invention by a hydraulic circuit.

In FIG. 1, a right traveling motor 1R and a left traveling motor 1L are arranged on the lower traveling body side A, a tank 2, a main hydraulic pump (hereinafter simply referred to as a hydraulic pump) 3, a pilot hydraulic pressure on the upper traveling body side B. A pump (hereinafter simply referred to as a pilot pump) 4, a traveling direction switching valve 5, a traveling operation lever device 6, an electromagnetic switching valve 7, and a controller 8 are arranged.

The right running motor 1R has two main ports 9
a and 9b, and the main ports 9a and 9b are connected to the direction switching valve 5 via the actuator lines 11a and 11b on the lower traveling body side A, the swivel joint 12, and the actuator lines 13a and 13b on the upper revolving body side B. The switching valve 5 is connected to the hydraulic pump 3 and the tank 2 via a pressure oil supply line 14 and a tank line 15. A valve unit 16 having a built-in overload relief valve and a counterbalance valve is disposed on the actuator lines 11a and 11b on the lower traveling body side A as is well known.

On the upper revolving unit side B, the direction switching valve 5 includes pressure receiving portions 5a and 5b, the operation lever device 6 includes an operation lever 6a and a remote control valve 6b, and the pressure receiving portions 5a and 5b connect pilot lines 18a and 18b. Via remote control valve 6
b.

When the operation lever 6a is operated in one direction, an operation pilot pressure corresponding to the operation amount is output to, for example, the pilot line 18a, and the direction switching valve 5 is switched to the lower position in the figure. By the switching of the direction switching valve 5, pressure oil is supplied from the hydraulic pump 5 to the right traveling motor 1R via the pressure oil supply line 14, the direction switching valve 5, the actuator line 13a, the swivel joint 12, and the actuator line 11a. The traveling motor 1R is driven to rotate, for example, in the forward direction. The pressure oil that has worked with the right running motor 1R is supplied to the actuator line 11b, the swivel joint 12, the actuator line 13b, the direction switching valve 5,
It is returned to the tank 2 via the tank line 15. The same applies when the operation lever 6a is operated in the opposite direction. In this case, the actuator lines 11b and 13b are on the supply side, and the actuator lines 11a and 13a are on the discharge side.

The left running motor 1L has two main ports 1
0a, 10b, and the left traveling motor 1L side is similarly configured.

The right traveling motor 1R and the left traveling motor 1L have two drain ports 21a, 21b, respectively.
, And 22a, 22b, and one of the two drain ports 21a, 22a is connected to the drain lines 23, 24, 25 of the lower traveling body side A, the swivel joint 12, and the drain line 26 of the upper revolving body side B. Connected to the tank 2 via

Two drain ports 21a, 21b and 22a, 22b are connected to the right running motor 1R and the left running motor 1L.
Is provided in order to use the same traveling motors 1R and 1L symmetrically arranged. Conventionally, only one port is actually used. In the present invention, the remaining drain ports 21b and 22b are used for warming up the traveling motor.

That is, the drain ports 21b and 22b of the right traveling motor 1R and the left traveling motor 1L are connected to the lower traveling body side A
Are connected to the electromagnetic switching valve 7 via the hydraulic oil lines 31, 32, 33, the swivel joint 12, and the hydraulic oil line 34 on the upper revolving unit side B.
5. Connected to the pilot hydraulic power source line 37 and the tank 2 via the tank line 36. The pilot hydraulic power source line 37 is connected to the pilot pump 4 and
The pilot hydraulic power source line 37 is provided with a pilot filter section 38 and a pilot pressure setting section 39. The pilot pressure setting section 39 has a relief valve 39a for regulating the pilot pressure, and the hydraulic oil line 35 is connected between the filter 38a of the pilot filter section 38 and the relief valve 39a. The electromagnetic switching valve 7 connects the hydraulic oil line 34 to the tank line 36 at the illustrated position, and connects the hydraulic oil line 35 to the hydraulic oil line 34 when switched from the illustrated position.

On the lower traveling body side A, the hydraulic oil line 3
In the vicinity of the drain ports 21b and 22b of the right and left traveling motors 1R and 1L, throttles 40 and 41 are provided to maintain the pilot pressure set by the pilot pressure setting unit 39 and to operate the right traveling motor 1R. In addition, the flow rate of the working oil supplied to the left traveling motor 1L is adjusted to a constant amount.

A warm-up switch 45 is provided on the upper revolving structure side B at a position in the operator's cab where the operator can operate it. A signal from the warm-up switch 45 is input to the controller 8. Pilot line 18 of operating lever device 6
A shuttle valve 46 is connected to a and 18b, and a pressure switch 48 is provided on an output line 47 of the shuttle valve 46. The signal of the pressure switch 48 is also input to the controller 8. The controller 8 selects excitation or non-excitation of the solenoid 7a of the electromagnetic switching valve 7 according to signals from the warm-up switch 45 and the pressure switch 48, and switches the electromagnetic switching valve 7.

FIG. 2 is an electric circuit diagram showing the processing functions of the controller 8. The controller 8 includes a warm-up switch 48
And a second relay 8b operated by the pressure switch 48. When the warm-up switch 8 is OFF, the first relay 8a is also OFF,
In the illustrated open state. At this time, the solenoid 7a of the electromagnetic switching valve 7 is not excited, and the electromagnetic switching valve 7 is held at the position shown in FIG. When the warm-up switch 8 is turned on, the first relay 8a is turned on and switched to the closed state, and the second relay 8b is turned on.
Is grounded. At this time, if the pressure switch 8b is OFF, the second relay 8b is also OFF and in the closed state shown in the drawing,
The solenoid 7a of the electromagnetic switching valve 7 is excited by the flow of current, and the electromagnetic switching valve 7 is switched from the position shown in FIG. Thereafter, when the pressure switch 8b is turned on, the second relay 8b is switched to the open state, the solenoid 7a of the electromagnetic switching valve 7 is de-energized, and the electromagnetic switching valve 7 is switched to the position shown in FIG.

FIG. 3 shows an external view of a hydraulic shovel on which the traveling heat device of the present invention is mounted. The hydraulic excavator has a lower traveling structure 101 and an upper revolving structure 102 rotatably mounted on the lower traveling structure 101. The upper revolving structure 102 has a driver's cab 103 and a front work machine. 104 are provided. The front work machine 104 includes a boom 105, an arm 106, and a front attachment such as a bucket 107. The boom 105, the arm 106, and the bucket 107 are driven by hydraulic cylinders 108, 109, and 110, respectively, and serve as a front attachment. When the bucket 107 is used as shown in the figure, operations such as excavation of earth and sand can be performed.

[0034] As shown in FIG.
Center frame 121C, right side frame 121R,
Track frame 1 composed of left side frame 121L
21; crawler belts 122R and 122L attached to the side frames 121R and 121L;
Traveling device 123 attached to the rear of 1R, 121L
R, 123L.

The right traveling device 123R is mounted on the right traveling motor 1R, a speed reducer 124R connected to a rotating shaft of the right traveling motor 1R, and a drum 51 (see FIG. 5) of the speed reducer 124R. In this configuration, the sprocket 125R is integrated with the crawler belt 122.
The crawler belt 122R is rotationally driven by engaging with a tooth portion provided inside the R. Similarly, the left traveling device 123L is configured by integrating the left traveling motor 1L, the speed reducer 124L, and the sprocket 125L.

FIG. 5 is a front view (viewed from the hydraulic motor side) of the right traveling device 12R, and FIG. 6 is a view taken in the direction of arrow VI in FIG. 4 corresponds to a front view in a state where the right traveling device 12R is mounted on the side frame 121R of the track frame 121.

5 and 6, the right running motor 1R
Are the main ports 9a, 9b and the drain ports 21a, 21
b, main port 9a, 9b and drain port 2
Both 1a and 21b are vertically symmetrically arranged as shown. By arranging the ports vertically symmetrically in this manner, the same traveling device can be used when the right traveling device 1R and the left traveling device 1L are used symmetrically.

Referring to FIG. 5, a sprocket 125R is fastened to a drum portion 51 of a speed reducer 124R (see FIG. 4) located on the rear side of the right running motor 1R in the drawing by bolts 52.

In FIG. 6, a motor mounting frame 55 having a hole 54 is provided at the rear end of the side frame 121R. The right running motor 1R of the right running device 1R is inserted into the hole 54 of the motor mounting frame 55, The right running device 1R is mounted on the side frame 121R by fastening the outer support member 56 of the right running motor 1R to the motor mounting frame 55 with bolts 57. The main ports 9a and 9b are connected to hoses 62a and 62b via connection plugs 61a and 61b, the upper drain port 21a is connected to a hose 64 via a connection plug 63, and the lower drain port 21b is connected to a hose 64a. A hose 66 is connected via a connection plug 65. Hose 62a, 62
b denotes the actuator lines 11a and 11b shown in FIG.
The hose 64 functions as the tank line 23 shown in FIG. 1, and the hose 66 functions as the hydraulic oil line 31 shown in FIG. Also, the lower drain port 2
The internal passage of the connection plug 65 of FIG.
0.

FIG. 7 is a sectional view of the right running motor 1R.
FIG. 7 is a cross-sectional view of the right traveling motor 1R when a cross section taken along line VII-VII of FIG.

In FIG. 7, the right running motor 1R is a diagonal axis type hydraulic motor, and has a main casing 71 and a cover casing 72.
Piston cylinder set including a cylinder block 73, a plurality of pistons 74 reciprocating in a plurality of cylinder holes provided in a circumferential direction of the cylinder block 73, and a center shaft 75 inserted into the center of the cylinder block 73. The three-dimensional body 76, the valve plate 77, and the output shaft 78 are incorporated. The valve plate 77 makes spherical contact with the bottom of the cylinder block 73, and the cylinder block 73 slides and rotates on the valve plate 77 by the reciprocating motion of the piston 74. Cylinder block 7
The rotation of No. 3 is transmitted to the output shaft 78, and the output shaft 78 rotates the input shaft of the speed reducer 124R (see FIG. 4) connected thereto.

The main casing 71 is provided with a supporting member 56, which is bolted to the motor mounting frame 55 as described above. The cover casing 72 is provided with main ports 9a and 9b (only one is shown) and drain ports 21a and 21b (only one is shown).

A cylinder hole 79 for changing the motor capacity is provided in the cover casing 72. When the capacity of the main running motor is changed or when the main running motor is used as a capacity changing type, the cylinder hole 79 is formed in the cylinder hole 79. The piston is inserted, the piston is linked to the valve plate 77, the position of the valve plate 77 is changed by operating the piston, and the capacity is changed by changing the angle of the center shaft 75.
That is, if the angle of the center shaft 75 is reduced, the moving stroke of the piston 74 is shortened, and the capacity is reduced (high speed and low torque). Conversely, if the angle of the center shaft 75 is increased, the moving stroke of the piston 74 becomes longer, and the capacity becomes large (low speed and large torque). In the present embodiment, since the traveling motor is of a fixed displacement type and the displacement is set in advance, the cylinder hole 79 is closed by the plug 80.

Next, the operation of the present embodiment configured as described above will be described.

First, when work is started in a cold region, the engine is started and then the warm-up switch 45 is turned on. As a result, as described above, the first relay 8a shown in FIG.
Is turned on to excite the solenoid 7a of the electromagnetic switching valve 7,
The electromagnetic switching valve 7 is switched from the position shown in FIG. As a result, the hydraulic oil in the tank 2 is supplied to the pilot hydraulic source line 37, the hydraulic oil line 35, the electromagnetic switching valve 7, the hydraulic oil line 34, the swivel joint 12, and the hydraulic oil lines 33, 3.
Go through drain ports 21b and 22b, right
Hydraulic oil flowing into the left traveling motors 1R, 1L and passing through the right and left traveling motors 1R, 1L flows through the drain ports 21a,
22a, the drain lines 23, 24, 25, the swivel joint 12, and the drain line 26 return to the tank 2.

Here, when the engine is started, the hydraulic pump 3 discharges a minimum flow of hydraulic oil, and the temperature of the hydraulic oil in the tank 2 rises due to the circulation of the hydraulic oil. The drain ports 21b and 22b are connected to the drain port 21a shown in FIG.
The hydraulic oil that has been opened to the cover casing 72 in the same manner as that described above, and that has flowed into the casings of the right and left traveling motors 1R and 1L from the drain ports 21b and 22b, is disposed inside the motor where the piston cylinder assembly 76 and the like are located. And reaches the contact sliding surface between the valve plate 77 and the cylinder block 73, the contact sliding surface between the cylinder block 73, the piston 74, the center shaft 75, and the output shaft 78, the bearing of the output shaft 78, and the like. . Also, the drain ports 21b, 2
2b is a lower drain port, and the drain port 21
After the working oil flowing from b and 22b fills the space in the casing, it escapes from the upper drain ports 21a and 22a, so that the working oil reaches every corner inside the motor.
Therefore, the temperature of the right and left traveling motors 1R and 1L can be effectively increased to the inside.

Thereafter, when the operating lever device 6 for traveling is operated in order to move the hydraulic excavator, the operating pilot pressure is output to the pilot line 18a or 18b, and the pressure switch 48 is turned on. The indicated second relay 8b is switched to the open state, and the electromagnetic switching valve 7
The solenoid 7a of FIG.
Is switched to the position. As a result, the supply of the hydraulic oil to the right and left traveling motors 1R and 1L is cut off, and the excess hydraulic oil in the right and left traveling motors 1R and 1L is removed from the hydraulic oil line 3
1, 32, and 33, the swivel joint 12, the hydraulic oil line 34, the electromagnetic switching valve 7, and the tank line 36 return to the tank 2.

Here, when the right and left running motors 1R and 1L are not driven, the warm-up operating oil flowing into the right and left running motors 1R and 1L from the drain ports 21b and 22b is on the opposite side. It comes out of drain ports 21a and 22a without a problem. However, when the warm-up operating oil is supplied from the drain ports 21b and 22b while the right and left traveling motors 1R and 1L are being driven, the main port 9a or 9b is being driven while the right and left traveling motors 1R and 1L are being driven. , 10a or 10b, the hydraulic oil leaks from the sliding portion and accumulates inside, so that the hydraulic oil does not completely escape from the drain ports 21a and 22a, and a hydraulic oil pressure exceeding a specified amount is trapped in the motor. ,
There is a possibility that the right and left traveling motors 1R and 1L may fail.

In the present embodiment, when the operating lever device 6 for traveling is operated while the right and left traveling motors 1R, 1L are being warmed up as described above, the supply of the operating oil for warming up is cut off. Therefore, it is possible to prevent the trouble of the traveling motor due to the heating device.

As described above, according to the present embodiment, since the operating oil for warming flows into the inside of the traveling motor, the temperature increasing effect is high and the traveling motor can be effectively warmed.

Further, since the safety device including the pressure switch 48 and the first and second relays 8a and 8b is provided, it is possible to prevent the trouble of the traveling motor due to the heating device.

As a supply port for the working oil for warming up, the remaining drain port 2 out of the two drain ports is used.
The use of 1b and 22b allows the conventional traveling motor to be used as it is. For this reason, it is not necessary to manufacture a dedicated traveling motor, so that management costs and the like can be reduced. In addition, a versatile traveling heat device can be provided.

Further, since the remaining drain ports 21b and 22b of the two drain ports are used, the existing machine can be remodeled without much trouble.

[0054]

According to the present invention, since the operating oil for warming flows into the traveling motor, the effect of increasing the temperature is high and the traveling motor can be effectively warmed.

Further, since the safety device is provided, it is possible to prevent the trouble of the traveling motor due to the heating device.

Further, since the excess drain port of the two drain ports is used for warming up, the conventional traveling motor can be used as it is, and there is no need to manufacture a dedicated traveling motor, so that management costs and the like are reduced. Can be reduced. In addition, a versatile traveling heat device can be provided.

Further, since an extra drain port is used,
The existing machine can be modified without much effort.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram illustrating a traveling heat device of a hydraulic shovel according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of a processing function of a controller and a safety device.

FIG. 3 is a diagram illustrating an appearance of a hydraulic excavator.

FIG. 4 is a partially transparent perspective view of a head traveling body of the hydraulic shovel.

FIG. 5 is a front view of the right traveling device.

FIG. 6 is a view taken in the direction of arrow VI in FIG. 4;

FIG. 7 is a sectional view of a traveling motor.

[Explanation of symbols]

 1R right traveling motor 1L left traveling motor 2 tank 3 main hydraulic pump 4 pilot hydraulic pump 5 traveling direction switching valve 6 traveling operating lever device 7 electromagnetic switching valve 8 controller 8a first relay 8b second relay 9a, 9b main port 10a , 10b Main port 11a, 11b Actuator line 12 Swivel joint 13a, 13b Actuator line 14 Pressure oil supply line 15 Tank line 16 Valve unit 18a, 18b Pilot line 21a, 21b; 22a, 22b Drain port 23, 24, 25, 26 Drain Line 31, 32, 33, 34, 35 Hydraulic oil line 36 Tank line 37 Pilot oil pressure source line 37 38 Pilot filter section 39 Pilot pressure setting section 40, 41 Throttle 45 Warm-up switch 46 Shuttle valve 47 Output line 48 Pressure switch 51 Drum 54 Hole 55 Motor mounting frame 61a, 61b Connection plug 62a, 62b Hose 63 Connection plug 64 Hose 65 Connection plug 66 Hose 71 Main casing 72 Cover casing 73 Cylinder block 74 Piston 75 Center shaft 76 Piston-cylinder assembly 77 Valve plate 78 Output shaft 79 Cylinder hole 80 Plug 101 Hydraulic excavator 102 Upper revolving structure 103 Operator cab 104 Front work mechanism 105 Boom 106 Arm 107 Bucket 108 Hydraulic cylinder 109 Traveling device 121 Track frame 121C Center frame 121R Right Side frame 121L Left side frame 122R, 122L Crawler belt 123R Right running device 123L Left running Apparatus 124R, 124L speed reducer 125R, 125L sprocket

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazunori Nakamura 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Works, Ltd. Terms (reference) 2D003 AA01 AB01 BA07 BB13 CA04 DA02 DA04 DB02 DC01 3H082 AA08 AA18 BB30 CC02 DE05 EE02

Claims (5)

[Claims] 1. A traveling heat device for a construction machine having a traveling motor driven by hydraulic pressure and having two drain ports, wherein one of two drain ports of the traveling motor is connected to a tank; A traveling heat device for a construction machine, wherein the other one is connected to a pilot hydraulic pressure source. 2. A traveling heat device for a construction machine according to claim 1, wherein a switching valve is provided in a pipe connecting another drain port of said traveling motor to a pilot hydraulic pressure source, and is provided at a position operable by an operator. A traveling heat device for a construction machine, comprising: a warm-up switch, wherein the switching valve is switched by the warm-up switch. 3. A traveling heat apparatus for a construction machine according to claim 1, wherein a switching valve is provided in a pipe connecting another drain port of said traveling motor to a pilot hydraulic pressure source, and the drive of said traveling motor is detected. Running detection switch,
A traveling heat device for a construction machine, wherein when the traveling detection switch detects driving of a traveling motor, the switching valve is switched so as to shut off supply of hydraulic oil. 4. The traveling heat device for a construction machine according to claim 3, wherein said traveling detection switch is a pressure switch for detecting a traveling operation pilot pressure. 5. The traveling heat device for a construction machine according to claim 1, wherein the two drain ports of the traveling motor are arranged vertically, the upper drain port is connected to a tank, and the lower drain port is connected to a pilot hydraulic pressure. A traveling heat device for a construction machine connected to a power source.