JP3898456B2 - Construction machine traveling heat device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction machine including a traveling motor driven by hydraulic pressure, and more particularly to a traveling heat apparatus for a construction machine that improves startability of a traveling motor in a cold region.
[0002]
[Prior art]
There is a hydraulic excavator as an example of a construction machine. In this hydraulic excavator, an upper swing body is installed on a lower traveling body so that the upper swing body can swing. The upper swing body is provided with a cab and a front working machine. The front working machine is composed of 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. The lower traveling body is usually provided with a crawler type traveling device symmetrically.
[0003]
The traveling of the lower traveling body and the swinging motion of the upper swinging body are performed by a hydraulic motor, and the operation of the boom, arm and bucket constituting the front working machine is performed by a hydraulic cylinder. Thus, the drive means of the hydraulic excavator is constituted by a hydraulic actuator composed of a hydraulic motor and a hydraulic cylinder.
[0004]
The hydraulic excavator normally performs work in the field. When one day of work is finished, the hydraulic excavator is kept in the state where it is placed in the work place until the next work starts. For example, if the excavator is disposed for a long time in a state where the ambient temperature is extremely low, such as in a cold region, the entire excavator is lowered to the same temperature as the ambient temperature. For this reason, the temperature of the engine, its cooling water, and engine oil installed in the hydraulic excavator also decreases, and in this state, the engine startability deteriorates. Also, in such a state, the hydraulic oil that operates the hydraulic actuator also becomes highly viscous and the flow becomes extremely poor.
[0005]
Considering the above points, as shown in Japanese Patent Application Laid-Open No. 10-2740 20 , in a cold region, the heater is installed to warm the engine, improve the engine startability, and rotate the engine by idling. The pump is started, the hydraulic oil is circulated, and the hydraulic oil temperature is raised.
[0006]
[Problems to be solved by the invention]
However, the above prior art has the following problems.
[0007]
The prior art described in Japanese Patent Laid-Open No. 10-2740 20 warms the engine as described above and improves engine startability. Moreover, the main pump is started by turning the engine by idling, the hydraulic oil is circulated, and the hydraulic oil temperature is raised. However, the engine cannot be warmed up only by idling the engine.
[0008]
The hydraulic cylinder that drives the front working machine can be warmed up without damaging the hydraulic cylinder by slowly starting the hydraulic cylinder. However, in the traveling device, since the piston that drives the traveling motor is small and is driven at high speed, it is difficult to drive the piston slowly, and it is difficult to warm up the traveling device. In particular, there is an idea to warm up the traveling motor by providing a passage of hydraulic oil for traveling heat on the casing side of the traveling motor, but in this case, it is necessary to newly create the traveling motor itself, and the production cost and management Expenses will increase. Further, since the hydraulic oil does not flow directly into the traveling motor, the temperature rise effect is small.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a traveling heat apparatus that uses a traveling motor that is normally used, has a high temperature rise effect, reduces management costs, and is versatile.
[0010]
[Means for Solving the Problems]
(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 travel motor is connected to the tank, the other is connected to the pilot hydraulic source, and the other drain port of the travel motor is switched to a pipe connected to the pilot hydraulic source. A valve is provided, a warm-up switch is provided at a position operable by an operator, a travel detection switch for detecting the drive of the travel motor is provided, and when the travel detection switch does not detect the drive of the travel motor, the warm-up switch is provided. When the machine switch is turned on, the switching valve is switched so that the hydraulic oil of the pilot hydraulic power source is supplied to the travel motor, and the travel detection switch detects the drive of the travel motor even when the warm-up switch is on. Then, a controller is provided for switching the switching valve so as to cut off the supply of hydraulic oil to the traveling motor .
[0011]
By connecting one of the two drain ports of the traveling motor to the pilot hydraulic power source in this way, the hydraulic oil of the pilot hydraulic source flows into the traveling motor, so the temperature rise effect is high and the traveling motor is effective. Warm up. Further, since the surplus drain port of the two drain ports is used, the conventional travel motor can be used as it is, and it is not necessary to produce a dedicated travel motor, so that the management cost and the like can be reduced. Moreover, the traveling heat apparatus with versatility can be provided. In addition, since the extra drain port is used, the current machine can be modified without much effort.
In addition, it is possible to select whether or not to warm up at the operator's will.
Furthermore, it is possible to prevent the occurrence of a squeeze pressure that occurs when hydraulic oil for warm-up is supplied while the travel motor is being driven, and to prevent a failure of the travel motor due to the heat device.
[0016]
( 2 ) In the above ( 1 ), preferably, the travel detection switch is a pressure switch for detecting a travel operation pilot pressure.
[0017]
As a result, the drive of the travel motor can be detected hydraulically.
[0018]
( 3 ) In the above (1), preferably, the two drain ports of the traveling motor are arranged vertically, the upper drain port is connected to the tank, and the lower drain port is connected to the pilot hydraulic pressure source. .
[0019]
As a result, the hydraulic oil flowing in from the drain port can easily reach the entire interior of the traveling motor, and the traveling motor can be effectively warmed up.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a diagram showing a traveling heat device of a hydraulic excavator according to an embodiment of the present invention by a hydraulic circuit.
[0022]
In FIG. 1, a right traveling motor 1R and a left traveling motor 1L are disposed on the lower traveling body side A, and a tank 2, a main hydraulic pump (hereinafter simply referred to as a hydraulic pump) 3, a pilot hydraulic pump (hereinafter referred to as a hydraulic pump) on the upper traveling body side B. 4), a traveling direction switching valve 5, a traveling operation lever device 6, an electromagnetic switching valve 7, and a controller 8.
[0023]
The right traveling motor 1R has two main ports 9a and 9b. The main ports 9a and 9b are connected to 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 swing body side B. The direction switching valve 5 is connected to the hydraulic pump 3 and the tank 2 via the pressure oil supply line 14 and the tank line 15. As is well known, a valve unit 16 incorporating an overload relief valve and a counter balance valve is arranged in the actuator lines 11a and 11b on the lower traveling body side A.
[0024]
On the upper swing body 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 are remote controlled via pilot lines 18a and 18b. Connected to the valve 6b.
[0025]
When the operation lever 6a is operated in one direction, for example, an operation pilot pressure corresponding to the operation amount is output to the pilot line 18a, and the direction switching valve 5 is switched to the lower position in the figure. As the direction switching valve 5 is switched, 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. For example, the traveling motor 1R is rotationally driven in the forward direction. The pressure oil worked by the right traveling motor 1R is returned to the tank 2 through the actuator line 11b, the swivel joint 12, the actuator line 13b, the direction switching valve 5, and 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.
[0026]
The left traveling motor 1L also has two main ports 10a and 10b, and the left traveling motor 1L is similarly configured.
[0027]
Further, the right traveling motor 1R and the left traveling motor 1L have two drain ports 21a, 21b and 22a, 22b, respectively, and one drain port 21a, 22a of these two drain ports is the lower traveling body side A. Are connected to the tank 2 through the drain lines 23, 24, 25, the swivel joint 12, and the drain line 26 on the upper swing body side B.
[0028]
The reason why the two drain ports 21a, 21b and 22a, 22b are provided in the right travel motor 1R and the left travel motor 1L is to use the same travel motors 1R, 1L symmetrically. 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.
[0029]
That is, the drain ports 21b and 22b of the right traveling motor 1R and the left traveling motor 1L are electromagnetically connected via the hydraulic oil lines 31, 32, 33 on the lower traveling body side A, the swivel joint 12, and the hydraulic oil line 34 on the upper swing body side B. The electromagnetic switching valve 7 is connected to the pilot hydraulic power source line 37 and the tank 2 via the hydraulic oil line 35 and 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 unit 38 and a pilot pressure setting unit 39. The pilot pressure setting unit 39 includes a relief valve 39a that regulates the pilot pressure, and the hydraulic oil line 35 is connected between the filter 38a of the pilot filter unit 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.
[0030]
On the lower traveling body side A, throttles 40 and 41 are provided in the vicinity of the drain ports 21b and 22b of the right traveling motor 1R and the left traveling motor 1L of the hydraulic oil lines 31 and 32, and the pilot pressure set by the pilot pressure setting unit 39 is provided. And the flow rate of the hydraulic oil supplied to the right traveling motor 1R and the left traveling motor 1L is adjusted to a constant amount.
[0031]
Further, on the upper swing body side B, a warm-up switch 45 is installed at a position that can be operated by an operator in the cab, and a signal from the warm-up switch 45 is input to the controller 8. A shuttle valve 46 is connected to the pilot lines 18 a and 18 b of the operation lever device 6, and a pressure switch 48 is provided on the output line 47 of the shuttle valve 46. A signal from the pressure switch 48 is also input to the controller 8. The controller 8 selects excitation or non-excitation of the solenoid 7 a of the electromagnetic switching valve 7 in accordance with signals from the warm-up switch 45 and the pressure switch 48 and switches the electromagnetic switching valve 7.
[0032]
FIG. 2 is an electric circuit diagram showing processing functions of the controller 8. The controller 8 includes a first relay 8 a that is operated by the warm-up switch 45 and a second relay 8 b that is operated by the pressure switch 48. When the warm-up switch 45 is OFF, the first relay 8a is also OFF and is in the open state shown in the figure. 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 45 is turned on, the first relay 8a is turned on and switched to the closed state, and the second relay 8b is grounded. At this time, if the pressure switch 48 is OFF, the second relay 8b is also OFF and is in the closed state shown in the figure, and the solenoid 7a of the electromagnetic switching valve 7 is excited by flowing current, and the electromagnetic switching valve 7 is in the position shown in FIG. Can be switched from. Thereafter, when the pressure switch 48 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.
[0033]
FIG. 3 shows the external appearance of a hydraulic excavator on which the traveling heat device of the present invention is mounted. The hydraulic excavator includes a lower traveling body 101 and an upper revolving body 102 that is turnably installed on the lower traveling body 101. The upper revolving body 102 is provided with a cab 103 and a front work machine. 104 is provided. The front work machine 104 includes a boom 105, an arm 106, and a front attachment such as a bucket 107, and the boom 105, the arm 106, and the bucket 107 are driven by hydraulic cylinders 108, 109, and 110, respectively, and serve as front attachments. When the bucket 107 is used as shown in the figure, work such as excavation of earth and sand can be performed.
[0034]
As shown in FIG. 4, the lower traveling body 101 includes a track frame 121 including a center frame 121C, a right side frame 121R, and a left side frame 121L, crawler belts 122R and 122L attached to the side frames 121R and 121L, and a side frame. 121R, 121L has travel devices 123R, 123L attached to the rear part.
[0035]
The right traveling device 123R includes the right traveling motor 1R, the speed reducer 124R connected to the rotation shaft of the right traveling motor 1R, and the sprocket 125R attached to the drum portion 51 (see FIG. 5) of the speed reducer 124R. The sprocket 125R engages with a tooth portion provided inside the crawler belt 122R to rotate the crawler belt 122R. Similarly, the left traveling device 123L is configured by integrating the left traveling motor 1L, the speed reducer 124L, and the sprocket 125L.
[0036]
FIG. 5 shows a front view of the right traveling device 123R (viewed from the hydraulic motor side), and FIG. 6 shows a view in the direction of the arrow VI in FIG. 4 corresponds to a front view of the right traveling device 123R mounted on the side frame 121R of the track frame 121.
[0037]
5 and 6, the right traveling motor 1R has main ports 9a and 9b and drain ports 21a and 21b, and the main ports 9a and 9b and the drain ports 21a and 21b are arranged vertically symmetrically as illustrated. By arranging the ports symmetrically in this way, the same traveling device can be used when the right traveling device 123R and the left traveling device 123L are used symmetrically.
[0038]
In FIG. 5, a sprocket 125 </ b> R is fastened by a bolt 52 to a drum portion 51 of a speed reducer 124 </ b> R (see FIG. 4) located on the rear side of the right traveling motor 1 </ b> R.
[0039]
In FIG. 6, a motor mounting frame 55 having a hole 54 is provided at the rear end portion of the side frame 121 </ b> R, and a right traveling motor 1 </ b> R portion of the right traveling device 123 </ b> R is inserted into the hole 54 of the motor mounting frame 55. The right traveling device 123R is attached to the side frame 121R by fastening the 1R outer support member 56 to the motor attachment 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 the lower drain port 21b. A hose 66 is connected via a connection plug 65. The hoses 62a and 62b function as the actuator lines 11a and 11b shown in FIG. 1, 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. In addition, the inner passage of the connection plug 65 of the lower drain port 21 b has a small diameter, and constitutes a throttle 40.
[0040]
FIG. 7 shows a cross-sectional view of the right travel motor 1R. FIG. 7 is a cross-sectional view of the right traveling motor 1 </ b> R portion as seen from the direction of the arrow shown in FIG.
[0041]
In FIG. 7, the right traveling motor 1 </ b> R is an oblique shaft type hydraulic motor, and has a main casing 71 and a cover casing 72, and the cylinder block 73 and the cylinder block 73 are arranged in the circumferential direction in the casings 71 and 72. A piston cylinder assembly 76 including a plurality of pistons 74 that reciprocate in a plurality of provided cylinder holes, a center shaft 75 fitted in the center of a cylinder block 73, a valve plate 77, and an output shaft 78 are incorporated. It is. The valve plate 77 comes into 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. The rotation of the cylinder block 73 is transmitted to the output shaft 78, and the output shaft 78 rotates the input shaft of a reduction gear 124R (see FIG. 4) connected thereto.
[0042]
The main casing 71 is provided with a support member 56, and the support member 56 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 shown) and drain ports 21a and 21b (only one shown).
[0043]
The cover casing 72 is provided with a cylinder hole 79 for changing the motor capacity. When changing the capacity of the main traveling motor or when using the main motor as a capacity changing type, a piston is inserted into the cylinder hole 79. 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 travel 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 travel of the piston 74 becomes longer, resulting in a large capacity (low speed and large torque). In the present embodiment, the traveling motor is of a fixed capacity type and the capacity is set in advance, so that the cylinder hole 79 is closed with a plug 80.
[0044]
Next, the operation of the present embodiment configured as described above will be described.
[0045]
First, when starting work in a cold region, the warm-up switch 45 is turned on after starting the engine. As a result, as described above, the first relay 8a shown in FIG. 2 is turned on, the solenoid 7a of the electromagnetic switching valve 7 is excited, and the electromagnetic switching valve 7 is switched from the position shown in FIG. As a result, the hydraulic oil in the tank 2 passes through the pilot hydraulic pressure 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, 32, 31, and the drain port 21b, The hydraulic fluid that has flowed from 22b into the right and left traveling motors 1R and 1L and passed through the right and left traveling motors 1R and 1L is drain ports 21a and 22a, drain lines 23, 24, and 25, swivel joint 12, and drain line. 26 and returned to the tank 2.
[0046]
Here, when the engine is started, the hydraulic pump 3 discharges the minimum amount of hydraulic oil, and the hydraulic oil in the tank 2 is heated by circulation of the hydraulic oil. The drain ports 21b and 22b are opened in the cover casing 72 in the same manner as the drain port 21a shown in FIG. 7, and the drain ports 21b and 22b enter the casings of the right and left traveling motors 1R and 1L. The hydraulic fluid that has flowed into the motor enters the piston / cylinder assembly 76 and the like, and contacts the sliding surface between the valve plate 77 and the cylinder block 73, between the cylinder block 73, the piston 74, the center shaft 75, and the output shaft 78. To the contact sliding surface, the bearing portion of the output shaft 78, and the like. Further, the drain ports 21b and 22b are lower drain ports, and the hydraulic oil flowing in from the drain ports 21b and 22b fills the space in the casing and then escapes from the upper drain ports 21a and 22a. It reaches every corner inside the motor. For this reason, the right and left traveling motors 1R and 1L can be effectively heated up to the inside.
[0047]
After that, when the operating lever device 6 for traveling is operated to move the hydraulic excavator, the operating pilot pressure is output to the pilot line 18a or 18b, the pressure switch 48 is turned on, and the first switch shown in FIG. 2 The 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. As a result, the supply of hydraulic oil to the right and left traveling motors 1R and 1L is cut off, and excess hydraulic oil in the right and left traveling motors 1R and 1L is supplied to the hydraulic oil lines 31, 32 and 33, the swivel joint 12, The oil is returned to the tank 2 through the hydraulic oil line 34, the electromagnetic switching valve 7, and the tank line 36.
[0048]
Here, when the right and left traveling motors 1R and 1L are not driven, the warm-up hydraulic fluid that has flowed into the right and left traveling motors 1R and 1L from the drain ports 21b and 22b is on the opposite drain port 21a. , 22a without problems. However, when the warm-up hydraulic fluid 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 fluid also flows in, leaks from the sliding part, etc., and accumulates inside, so that the hydraulic fluid does not completely drain from the drain ports 21a, 22a, and the hydraulic fluid pressure exceeds the specified amount in the motor. There is a possibility that the right and left traveling motors 1R and 1L will fail.
[0049]
In the present embodiment, as described above, when the operating lever device 6 for traveling is operated while the right and left traveling motors 1R, 1L are warmed up, the supply of warming hydraulic oil is shut off, It is possible to prevent a failure of the traveling motor caused by the device.
[0050]
As described above, according to the present embodiment, the warming-up hydraulic fluid flows into the traveling motor, so that the temperature raising effect is high and the traveling motor can be effectively warmed up.
[0051]
Moreover, since the safety device which consists of the pressure switch 48 and the 1st and 2nd relays 8a and 8b is attached, the failure of the traveling motor by a heat apparatus can be prevented.
[0052]
Further, since the remaining drain ports 21b and 22b of the two drain ports are used as the supply port for the warm-up hydraulic oil, the conventional traveling motor can be used as it is. For this reason, since it is not necessary to produce a dedicated traveling motor, management costs and the like can be reduced. Moreover, the traveling heat apparatus with versatility can be provided.
[0053]
Further, since the remaining drain ports 21b and 22b of the two drain ports are used, the current machine can be modified without much trouble.
[0054]
【The invention's effect】
According to the present invention, since the warming-up hydraulic fluid flows into the traveling motor, the temperature rise effect is high, and the traveling motor can be effectively warmed up.
[0055]
Moreover, since the safety device is attached, it is possible to prevent the traveling motor from being damaged by the heat device.
[0056]
In addition, since the remaining drain port of the two drain ports is used for warm-up, a conventional travel motor can be used as it is, so that it is not necessary to prepare a dedicated travel motor, thereby reducing management costs and the like. Moreover, the traveling heat apparatus with versatility can be provided.
[0057]
In addition, since the extra drain port is used, the current machine can be modified without much effort.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram showing a traveling heat device of a hydraulic excavator according to an embodiment of the present invention.
FIG. 2 is an electrical circuit diagram of a processing function of a controller and a safety device.
FIG. 3 is a diagram showing an external appearance of a hydraulic excavator.
FIG. 4 is a partially transparent perspective view of a head portion traveling body of a hydraulic excavator.
FIG. 5 is a front view of the right traveling apparatus.
6 is a view in the direction of the arrow VI in FIG. 4;
FIG. 7 is a cross-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 operation 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 Lines 31, 32, 33, 34, 35 Hydraulic oil line 36 Tank line 37 Pilot hydraulic power source line 37
38 Pilot filter section 39 Pilot pressure setting section 40, 41 Restriction 45 Warm-up switch 46 Shuttle valve 47 Output line 48 Pressure switch 51 Drum section 54 Hole 55 Motor mounting frames 61a, 61b Connection plugs 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 swing body 103 Driver's cab 104 Front work mechanism 105 Boom 106 Arm 107 Bucket 108 Hydraulic cylinder 109 Travel device 121 Track frame 121C Center frame 121R Right side frame 121L Left side frame Arm 122R, 122L crawler 123R right traveling device 123L left traveling device 124R, 124L speed reducer 125R, 125L sprocket

Claims (3)

In a traveling heat apparatus 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 travel motor is connected to the tank and the other one is connected to a pilot hydraulic source;
A switching valve is provided in a pipe line connecting another drain port of the traveling motor to a pilot hydraulic power source, a warm-up switch is provided at a position where the operator can operate, and a traveling detection switch for detecting the driving of the traveling motor set,
When the travel detection switch does not detect driving of the travel motor, turning on the warm-up switch switches the switching valve so as to supply hydraulic oil from the pilot hydraulic power source to the travel motor. even switch is ON, the construction machine, characterized in that a controller for switching the switching valve so that the travel detection switch off the supply of hydraulic oil to the traveling motor and for detecting the driving of the travel motor Traveling heat device.   The traveling heat apparatus for a construction machine according to claim 1, wherein the traveling detection switch is a pressure switch for detecting an operation pilot pressure for traveling.   2. The traveling heat device for a construction machine according to claim 1, wherein the two drain ports of the traveling motor are arranged one above the other, the upper drain port is connected to the tank, and the lower drain port is connected to the pilot hydraulic pressure source. A running heat device for construction machinery.

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