JP4544822B2 - Oil pan preheating device for power transmission mechanism of work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preheating an oil pan of a power transmission mechanism before starting a work machine such as a bulldozer or a hydraulic excavator used mainly in a cryogenic region.
[0002]
[Prior art]
Unlike in regions with a warm climate, construction machinery such as bulldozers and hydraulic excavators used in cold regions, especially in regions with extremely low temperatures, are at temperatures below -30 ° C. The startup and power transmission mechanism cannot be operated smoothly. Therefore, it is necessary to heat the engine and the power transmission mechanism and to enable the engine coolant circulation and the oil lubrication of the power transmission mechanism at the start.
[0003]
Conventionally, as a means for enabling a low temperature start, a portable warm air generator is used to feed a tip of a duct with a jet port to a lower side of an engine mounting portion of a vehicle body while supporting it on a moving table, and from the outside A system is known in which wind is blown to increase the temperature around the engine mounting portion (see, for example, Patent Document 1). Alternatively, a preheater for preheating the engine part of the work machine is mounted in advance, and at the time of start-up, the heated gas from the preheater is sent to the exhaust gas introduction chamber of the oil pan made into a double structure and heated. Is known (see Patent Document 2).
[0004]
[Patent Document 1]
US Pat. No. 3,809,527 [Patent Document 2]
Japanese Patent Laid-Open No. 10-205319
[Problems to be solved by the invention]
However, in the warm air blowing method according to Patent Document 1, warm air from a warm air generator is sent from the lower part around the engine through a duct to heat the engine around from the outside, so that the temperature is relatively high even at low temperatures. Even if it is possible in the region, if the temperature is extremely low (−30 ° C. or lower), the heating efficiency is not good, so the heating time becomes very long, and this method is used in the steering case of the power transmission mechanism. There is a problem that it is not practical to apply it as it is to preheating.
[0006]
Further, the method known from Patent Document 2 uses a preheater mounted on a vehicle, so that there is a convenience in which a preheating operation at start-up can be performed without preparing a separate hot air generator, Heated gas (combustion gas) is sent to the exhaust gas introduction chamber of the heavy structure to heat the oil in the oil pan, so it is effective at first glance, but only one heating gas supplied in a narrow space passes through. Therefore, the capacity of the supplied gas is limited, and it is necessary to supply a large amount of heated gas. In other words, there is a problem that the preheating time until operation becomes possible becomes long.
[0007]
The present invention has been made to solve such problems, and an oil pan of a power transmission mechanism of a work machine used in a cryogenic region is easily connected to a portable hot air generator at start-up by a duct. Thus, an object of the present invention is to provide an oil pan preheating device for a power transmission mechanism of a work machine that enables efficient heating directly from the outside.
[0008]
[Means for solving the problems and actions / effects]
In order to achieve the above-described object, an oil pan preheating device for a power transmission mechanism of a work machine according to the present invention includes:
The rear portion of the body main frame of the working machine, Rutotomoni provided recess for accommodating the power transmission mechanism rear of the steering case to be mounted, the oil pan is provided on the inner bottom of the steering case, the bottom of the recess rear wall A hot air passage that communicates with the outside is formed, and a duct tip that feeds hot air generated by a hot air generator from the outside is detachably connected to the hot air passage.
[0009]
According to the present invention, with respect to the oil pan at the lower part of the steering case at the rear part of the power transmission mechanism disposed in the concave part formed at the rear part of the main body of the vehicle body of the work machine, the lower part in the concave part of the main frame. The hot air generated by the hot air generator prepared before starting outside the vehicle body is blown into the concave portion and directly heated from the hot air passage penetrated through the wall portion formed at the rear portion of the main frame.
By doing so, hot air sent from the outside is blown directly onto the oil pan below the steering case located in the recess, and the hot air flows upward from the bottom surface, wrapping the outer periphery of the oil pan. As a result, hot air flows and heat is effectively exchanged. At this time, the hot air flowing into the recess flows upward from the bottom surface of the oil pan through the gap between the inner wall of the recess and the steering case, and the upper part is opened so as not to restrict the flow. Thus, heat can be effectively exchanged with the outer surface of the casing. In other words, the outer peripheral surface of the oil pan is heated as a whole. As a result, the oil pan can be preheated efficiently, and the preheat can be performed in a short time.
[0012]
In the present invention, the hot air passage is formed in the lower part of the rear wall of the main frame in the axial direction of the vehicle body from the outside to the inner lower part of the concave part, and at its outer end there is a duct insertion holding part connected to the hot air generator. It is preferable that the inner end is provided so as to be located near the bottom of the recess . By doing so, hot air can be directly blown to the bottom of the steering case of the power transmission mechanism that fits in the recess of the main frame, and heat exchange (preheating) can be performed efficiently.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Then, with the specific embodiment of the oil pan preheating device for a working machine of the power transmission mechanism according to the present invention will be described with reference to the drawings.
[0014]
This embodiment demonstrates the case where it applies to a bulldozer.
[0015]
FIG. 1 shows a schematic diagram of the arrangement of power transmission mechanisms in the bulldozer of this embodiment. 2 is a cross-sectional view of the main part where the oil pan is preheated, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a view showing a connecting portion of the duct to the hot air passage. Yes.
[0016]
A bulldozer 1 to which this oil pan preheating device is applied has a crawler belt 2 on each side of the vehicle body, and a power transmission mechanism 5 (torque converter 5a, A crawler type traveling device driven via a transmission 5b and a steering mechanism 5c) is provided, and a driver's cab 6 is provided in the rear upper part of the vehicle body. A blade 7 is arranged at a front position of the vehicle body by a pair of frames arranged on both the left and right sides, and the blade 7 can be operated by a tilt cylinder and a undulation cylinder. In addition, a ripper device 8 is attached to the rear portion so that ripper work can be performed.
[0017]
In the bulldozer 1 having such a configuration and cold-cold specification model, the engine 4 can be preheated before the engine 4 is started, and the steering case that houses the steering mechanism 5c in the power transmission mechanism 5 in particular. It is necessary to preheat the oil pan 5 </ b> B provided in the inner lower portion of 5 </ b> A so that the traveling device can operate after the engine 4 is started. Therefore, in the main frame 3 of this embodiment, the installation part of the steering case 5A located at the rearmost part of the power transmission mechanism 5 is provided on the left and right longitudinal members 3a, 3a of the main frame 3 arranged at a required interval. On the other hand, a box structure that is orthogonally connected at the rear part and connected to each other by the rear lateral member 3b and opened upward from the rear lateral member 3b to both side portions of the transmission that is installed just in front. The steering case 5 </ b> A is formed in the box structure portion 10. Note that the steering case 5A is connected to unillustrated crawler belt drive wheels with output shafts projecting left and right perpendicular to the axis of the power transmission mechanism 5.
[0018]
The bottom of the box structure 10 is covered with a bottom plate member 11, and the rear transverse member 3b is configured as a double-structured wall as shown in FIG. Therefore, the steering case 5A that fits inside the box structure 10 is surrounded by the left and right longitudinal members 3a, 3a, the rear lateral member 3b, and the lateral member 3d located on the front side. The box structure 10 is received in a recess 12 formed in the lower part of the box structure 10.
[0019]
A hot air passage 13 penetrating from the outside is provided at a position close to the inner bottom of the concave portion 12 in an intermediate portion in the width direction of the rear transverse member 3 b with respect to the concave portion 12. The outer end portion of the hot air passage 13 is formed with a connecting portion 14 to which a duct 22 from a portable hot air generator 20 used for preheating can be connected. The connecting portion 14 of the duct 22 is configured to close the hot air passage 13 with the lid 15 at times other than during preheating work.
[0020]
The hot air generator 20 for preheating is a combination of a cylindrical main body with a burner and a blower. The hot air generator 20 generates hot air and sends it to a target location by a duct 22 connected to a hot air outlet 21 at the tip of the main body. It is an apparatus having a known structure. The hot air generator 20 is mounted on a carriage 24 so as to be movable, and is supplied with fuel oil from an oil tank (not shown) and burned.
[0021]
In the embodiment made in this way, the portable hot air generator 20 prepared separately before the start of work as a preparatory work is carried to the rear part of the vehicle body of the bulldozer 1 and the duct 22 connected to the hot air outlet 21 of the hot air generator 20. Is inserted into the hot air passage 13 from the duct connecting portion 14 at the rear of the vehicle body and connected.
[0022]
After the preparation is completed, the hot air generator 20 is started, the fuel is burned by the burner therein, and the hot air is fed into the recess 12 of the vehicle body main frame 3 through the duct 22 by the blower.
[0023]
The hot air sent into the recess 12 is first blown directly from the hot air passage 13 to the bottom of the steering case 5A located at the inner bottom of the recess 12, and the oil pan 5B at that position is heated. Since the bottom part (oil pan 5B) of the steering case 5A located in the recess 12 is surrounded by the frame constituent members, the bottom part of the steering case 5A (oil pan 5B) is not raised as it is. It flows so as to lick the peripheral surface, and gradually flows up and dissipates in the gap between the case and the inner surface of the frame constituent members (3a, 3b, 3c) surrounding the periphery. While the gap is raised, heat is exchanged with the case side by the hot air, and not only the bottom but also the middle part is heated.
[0024]
Moreover, since the hot air sent into the recess 12 has a structure in which the incoming recess 12 is opened upward and does not restrain the flow, the bottom 5B of the steering case 5A is first applied as described above. It can be heated effectively by direct heating and then dissipating upward through the gap between the inner peripheral wall surface of the recess 12 and the case. Moreover, since the part which forms the recessed part 12 of a main frame is the structure enclosed by the member of a box structure except the baseplate 11 part, the heat insulation effect in those surrounding wall parts can also be anticipated, and the hot air sent in It is possible to increase the heating rate of the oil pan 5B in the steering case 5A, which is the purpose of saving that the heat quantity is dissipated outside through the frame. As a result, the heating efficiency is improved and the preheating time can be shortened.
[0025]
When the oil in the oil pan 5B is preheated to a state suitable for starting, the duct 22 connecting the hot air generator 20 and the recess 12 is removed, and the duct 22 and the hot air generator 20 are moved away from the bulldozer 1. By moving it, the bulldozer can be operated.
[0026]
Thus, according to this embodiment, since the work for preheating can be performed at the rear part of the vehicle body, there is an advantage that workability is improved.
[0027]
In the above description, the oil pan provided in the rear part of the power transmission mechanism of the bulldozer has been described as being preheated. However, the present invention can also be applied to other work machines having a cold district specification. In this case, it is preferable that the frame structure corresponds to the shape / arrangement of the power transmission mechanism in accordance with the above-mentioned purpose.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an arrangement of a power transmission mechanism in a bulldozer according to an embodiment.
FIG. 2 is a cross-sectional view of a main part where preheating of the oil pan is performed.
FIG. 3 is a plan view of FIG. 2;
FIG. 4 is a diagram illustrating a connecting portion of a duct with respect to a hot air passage.
[Explanation of symbols]
1 Bulldozer 3 Main frame 3a Longitudinal member 3b Rear lateral member 4 Engine 5 Power transmission mechanism 5c Steering mechanism 5A Steering case 5B Oil pan 10 Box structure 11 Bottom plate 12 Recess 13 Hot air passage 14 Duct connecting portion 20 Hot air generator 22 Duct

Claims (2)

The rear portion of the body main frame of the working machine, Rutotomoni provided recess for accommodating the power transmission mechanism rear of the steering case to be mounted, the oil pan is provided on the inner bottom of the steering case, the bottom of the recess rear wall A power transmission mechanism for a working machine, wherein a hot air passage that communicates with the outside is formed in the hot air passage, and a tip of a duct that feeds the hot air generated by the hot air generator from the outside is detachably connected to the hot air passage. Oil pan preheating device.   The hot air passage is formed in the lower part of the rear wall of the main frame in the axial direction of the vehicle body from the outside to the inner lower part of the recess, and at the outer end thereof is provided a duct insertion holding part connected to the hot air generator. The oil pan preheating device for a power transmission mechanism of a work machine according to claim 1, wherein the end is formed so as to be positioned close to the bottom of the recess.

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