JP2009019348A - Engine support structure in wheel loader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a space needed for supporting an engine as much as possible in a wheel loader having the engine arranged between right/left machine body frames to facilitate layouts of equipment and devices and piping arranged around the engine. <P>SOLUTION: The engine 7 is supported by a three-point support structure so that an engine front is supported at two points at the left and right against left and right machining body frames 9L and 9R via left and right front engine mounts 19L and 19R, and that an engine rear is supported at one horizontally central point with respect to the left and right machining body frames 9L and 9R via a rear engine mount 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of an engine support structure in a wheel loader in which an engine is disposed between left and right body frames.

Generally, a wheel loader is configured by connecting a front vehicle having a front wheel and a rear vehicle having a rear wheel so as to be able to swing left and right via a connecting portion. The rear vehicle is provided with a power-related device such as an engine, a driver's seat, and the like. In such a wheel loader, when the engine is mounted on the rear vehicle, conventionally, the engine is disposed between the left and right fuselage frames, and the left and right sides of the front and rear portions of the engine are disposed outwardly from the left and right sides of the engine. A so-called four-point support structure is known that is supported on the left and right body frames through a total of four engine mounts (see, for example, Patent Document 1).
JP 2004-143871 A

  By the way, in recent years, especially in small models, the size of the aircraft has been reduced so that it can turn slightly, limiting the size between the left and right aircraft frames, while the engine complies with high output and exhaust gas regulations It tends to increase in size as much as possible. For this reason, when the engine is disposed between the left and right body frames, it is difficult to secure a space for arranging a total of four engine mounts on the left and right sides of the engine with the conventional four-point support structure. There is a problem that these engine mounts obstruct the layout of engine-related equipment, piping, and wiring arranged around the engine, and there is a problem to be solved by the present invention.

The present invention was created with the object of solving these problems in view of the above-mentioned circumstances, and the invention of claim 1 is a wheel in which an engine is disposed between left and right body frames. In the ruloader, the engine is supported by two left and right engine front portions located on the front side of the wheel loader and the engine rear portion located on the rear side of the fuselage in the left-right direction with respect to the left and right fuselage frames. An engine support structure in a wheel loader, which is a three-point support structure supported at one central portion.
According to a second aspect of the present invention, the engine front is supported by left and right front support frames fixed to the left and right body frames via left and right front engine mounts, while the engine rear is between the left and right body frames. 2. The engine support structure for a wheel loader according to claim 1, wherein the engine support structure is supported by a rear support frame to be supported via a rear engine mount.
The invention according to claim 3 is the engine support structure in the wheel loader according to claim 2, wherein the left and right front engine mounts are arranged so as to be positioned in front of the engine.
According to a fourth aspect of the present invention, in the wheel loader according to the second or third aspect, the rear engine mount is disposed so as to be positioned below the axis of the crankshaft in a rear view. Engine support structure.
The invention according to claim 5 is characterized in that the rear mounting bracket that is fixed to the engine so that the rear engine mount is attached to the engine is used as a support bracket for an equipment device arranged around the engine. An engine support structure in a wheel loader according to any one of 2 to 4.

According to the invention of claim 1, the engine is supported by the left and right body frames with a three-point support structure in which the front part of the engine is supported at two places on the left and right, and the rear part of the engine is supported at one place in the central part in the left and right direction. Thus, unlike the conventional four-point support structure, there is no need to secure support spaces on both the left and right sides of the rear part of the engine, and accordingly, the equipment, piping, and wiring arranged around the engine are arranged accordingly. Since the installation space can be widened, the layout of these equipment, piping, and wiring becomes easy, which can greatly contribute to the improvement of assembly and maintenance.
With the invention according to claim 2, the engine is supported at the left and right front engine mounts and the left and right engine mounts at two left and right positions, and the engine rear is supported at one central position in the left and right direction. The three-point support structure is supported by the left and right aircraft frames.
According to the invention of claim 3, it is not necessary to secure the space for disposing the left and right front engine mounts on the left and right outside of the engine, so that the size between the left and right body frames is small. Even in cases where there are restrictions, it is possible to mount a large engine as much as possible in order to meet high output and exhaust gas regulations.
By setting it as invention of Claim 4, even if an engine rear part is supported by one place, an engine can be supported stably.
According to the invention of claim 5, the rear mounting bracket is also used as a support bracket for an equipment device arranged around the engine, which can contribute to effective use of the members.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a wheel loader which is an example of a construction machine. The wheel loader 1 includes a front vehicle 1A provided with a front wheel 2 and a rear vehicle 1B provided with a rear wheel 3. Are connected to each other through a connecting portion 1C so as to be swingable left and right. The front vehicle 1A is equipped with a working device 6 including a bucket 4, an arm 5 and the like, while the rear vehicle 1B is equipped with an equipment device such as an engine 7, a cab 8, a fuel tank and hydraulic oil (not shown). The basic configuration such as the provision of various members such as a tank is the same as in the past.

  Reference numerals 9L and 9R denote left and right airframe frames that constitute a frame of the rear vehicle 1B, and an engine room 10 in which the engine 7 and engine-related equipment are housed is formed between the left and right airframe frames 9L and 9R. Has been. The rear side of the engine room 10 is covered with a counterweight 11 at the lower half and covered with an engine hood 12 that can be opened and closed at the upper half.

  In the engine 7, the front part of the engine 7 to which the flywheel case 13 and the hydraulic pump device 14 are assembled is located on the front side of the body, and the rear part of the engine 7 to which the crankshaft pulley 15 and the cooling fan 16 are assembled is the rear side of the body. It is arranged in the engine room 10 in a state located on the side. Further, in the engine room 10, a cooling device 17 such as a radiator, an oil cooler, and a condenser is disposed behind the cooling fan 16, and various engine-related devices such as a muffler 18, an air cleaner (not shown), and a fuel filter, which will be described later. The device is arranged.

  Here, the engine 7 is supported on the left and right body frames 9L and 9R at the left and right front engine mounts 19L and 19R with respect to the left and right body frames 9L and 9R, and the rear part of the engine 7 is the rear engine. It has a three-point support structure that is supported at one central portion in the left-right direction via the mount 20.

  The left and right front engine mounts 19L and 19R and the rear engine mount 20 have a vibration isolation function made of vibration isolation rubber or the like. The left and right front engine mounts 19L and 19R Left and right front mounting brackets 21L and 21R fixed to the flywheel case 13 assembled to the front of the engine 7 and left and right airframe frames 9L and 9R to support the airframes 9L and 9R in a vibration-proof manner. Between the left and right front support frames 22L, 22R.

  The left and right front mounting brackets 21 </ b> L and 21 </ b> R protrude from the left and right sides of the front surface of the flywheel case 13 toward the front. Thus, the front engine mounts 19L and 19R attached to the left and right front mount brackets 21L and 21R are positioned in front of the engine 7, thereby providing a space for disposing the front engine mounts 19L and 19R. It is not necessary to secure the engine 7 on the left and right outer sides.

  The rear engine mount 20 includes a rear mounting bracket 23 fixed to the engine 7 and left and right body frames 9L and 9R so that the rear part of the engine 7 is supported by the left and right body frames 9L and 9R in a vibration-proof manner. It is interposed between the rear side support frame 24 supported in between.

The rear mounting bracket 23 is formed of left and right side plates 23aL and 23aR, a mount mounting plate 23b, a reinforcing stay 23c, and the like. The left and right side plates 23aL and 23aR have base ends at the left and right side surfaces of the rear portion of the engine 7. Bolts are fixed to the lower part, and the tip part extends toward the rear lower side of the engine 7, and a mount mounting plate 23b is supported between the tip parts of the left and right side plates 23aL and 23aR. The mount mounting plate 23b is located below the crankshaft pulley 15 assembled to the rear portion of the engine 7, and the rear engine mount 20 is mounted at a substantially central portion in the left-right direction of the mount mounting plate 23b. ing. In this case, the rear engine mount 20 is positioned below the axis O of the crankshaft 7a of the engine 7 when viewed from the rear, whereby the rear portion of the engine 7 is supported at a single location. However, the engine 7 can be stably supported. Further, the reinforcing stay 23c is provided on the lower left side of the engine 7 so as to cover substantially the entire length in the front-rear direction, the front part is bolted to the flywheel case 13, and the rear part is bolted to the left side 23aL. Yes.
The crankshaft pulley 15 is a pulley that is directly connected to the crankshaft 7a of the engine 7 so as to transmit the engine rotation to the cooling fan 16, the alternator 27, the compressor 28, and the like via belts 25 and 26.

  On the other hand, as described above, various engine-related equipment devices are arranged in the engine room 10. The muffler 18, which is one of these equipment devices, is attached to the rear mounting bracket 23 via the mounting bracket 29. In a state of being supported by the reinforcing stay 23 c, it is arranged on the left outer side of the rear engine mount 20. Further, the tail pipe 18a connected to the muffler 18 is configured to extend rearward to the opening 11a opened in the counterweight 11, and to face the outside of the machine body from the opening 11a. The compressor 28 is connected to the crankshaft pulley 15 via the belt 26 as described above. The compressor 28 is supported by the right side plate 23aR of the rear mounting bracket 23 via the mounting bracket 30. In this state, it is disposed on the right outside of the rear engine mount 20.

In the present embodiment configured as described, the engine 7 is disposed between the left and right fuselage frames 9L and 9R. In this case, the front portion of the engine 7 is left and right via the left and right front engine mounts 19L and 19R. It is supported at two locations, and is supported by the left and right body frames 9L and 9R with a three-point support structure in which the rear portion of the engine 7 is supported at one central portion in the left-right direction via the rear engine mount 20.
As a result, it is only necessary to secure a space for arranging the rear engine mount 20 that supports the rear portion of the engine 7 in the central portion of the left and right direction. It is no longer necessary to secure engine mounting space on both the left and right sides. As a result, it is possible to increase the space for arranging the equipment, piping, and wiring around the engine 7, and the layout of the equipment, piping, and wiring is facilitated and assembled. Can greatly contribute to the improvement of safety and maintainability.

  Moreover, since the rear engine mount 20 is disposed so as to be positioned below the axis O of the crankshaft 7a in the rear view, the engine 7 rear portion is supported at a single location. 7 can be stably supported.

  Further, the left and right front engine mounts 19 </ b> L and 19 </ b> R are arranged to be positioned in front of the engine 7. As a result, not only the rear engine mount 20 but also the left and right front engine mounts 19L and 19R do not need to have a space for arranging the engine 7 on the left and right sides. Even if there is a restriction on the dimension between the body frames 9L and 9R, the engine 7 with the largest possible left and right width can be arranged, so that it can cope with high output and exhaust gas regulations. A large engine 7 can be mounted.

Further, a muffler 18 and a compressor 28 arranged on the left and right outer sides of the rear engine mount 20 are supported on the rear mount bracket 23 fixed to the engine 7 so that the rear engine mount 20 is attached to the engine. Thus, the rear mounting bracket 23 can also be used as a bracket for supporting the equipment arranged around the engine 7, thereby contributing to effective use of the members.
In the present embodiment, the muffler 18 and the compressor 28 are shown as device devices arranged around the engine 7, but the present invention is not limited to this, and other device devices such as an air cleaner may be used. Of course.

It is a side view of a wheel loader. It is a top view which shows the inside of an engine room. FIG. 3 is an XX arrow view of FIG. 2. It is a YY arrow line view of FIG. It is a ZZ arrow line view of FIG. (A), (B), (C) is a plan view, a left side view, and a rear view of the rear mounting bracket.

Explanation of symbols

7 Engine 7a Crankshaft 9L, 9R Left and right fuselage frames 19L, 19R Left and right front engine mounts 20 Rear engine mounts 22L, 22R Left and right front support frames 23 Rear mount brackets 24 Rear support frames

Claims (5)

  In the wheel loader in which the engine is disposed between the left and right body frames, the engine has two left and right engine front portions located on the front side of the wheel loader body with respect to the left and right body frames. The engine support structure in the wheel loader is a three-point support structure in which the rear part of the engine located on the rear side of the machine body is supported at one central portion in the left-right direction.   The engine front is supported by left and right front support frames fixed to the left and right body frames via left and right front engine mounts, while the engine rear is a rear support frame that is supported between the left and right body frames. The engine support structure for a wheel loader according to claim 1, wherein the engine support structure is supported by a rear engine mount.   3. The engine support structure in a wheel loader according to claim 2, wherein the left and right front engine mounts are arranged to be positioned in front of the engine.   4. The engine support structure for a wheel loader according to claim 2, wherein the rear engine mount is disposed so as to be positioned below the axis of the crankshaft in a rear view.   The rear mounting bracket that is fixed to the engine so that the rear engine mount can be attached to the engine is used as a support bracket for an equipment device disposed around the engine. An engine support structure in the wheel loader according to the item.

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