JP2786986B2 - Work vehicle engine support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a lateral output shaft of an engine and a lateral input shaft of a transmission case arranged obliquely rearward and downward interlockingly connected by a belt transmission, and a front end side of the engine is a bush type. The present invention relates to an engine support structure for a working vehicle, which is pivotally connected to a frame via a vibration isolating rubber so as to be rotatable up and down around a horizontal axis and supports the rear end side of the engine through a vertical vibration isolating rubber. .

[0002]

2. Description of the Related Art In an engine support structure for a work vehicle, conventionally, an output shaft of an engine and an input shaft of a transmission case are initially assembled, that is, an unloaded state in which a transmission belt of a belt transmission is wound. In such a state, the engine and the transmission case are arranged such that the respective axes are substantially parallel.

[0003]

As described above, an engine having a structure in which the front end side of the engine is pivotally connected to the body frame via a bush-type anti-vibration rubber so as to be rotatable vertically around a horizontal axis is known as an engine. While having the advantage of suppressing the transmission of the vibration of the vehicle to the body frame and reducing the noise due to the body vibration and the deterioration of the driving environment due to the vibration of the driver's seat, for example, the front end side and the rear end side of the engine The vibration in the front-rear direction due to the engine being pulled to the transmission case side due to the change in belt tension due to the fluctuation of the load on the work machine is suppressed compared to the case where the support is carried out via the rubber cushions in the vertical direction. Although there are advantages that can be achieved, there are still the following points to be improved. In other words, the output shaft of the engine and the input shaft of the transmission case are both cantilevered and protrude laterally from one side. When the load on the belt transmission becomes large, the engine tension occurs due to the belt tension. As a result, a cantilever-like rearward pulling force acts on the engine, and the engine is mounted on the rubber as described above. As a result, the engine output shaft is tilted rearward and obliquely downward toward the outer protruding end side due to belt tension, and the power transmission is performed. The output shaft pulley has an oblique attitude with respect to the belt, causing local sliding wear between the transmission belt and the pulley, resulting in an early cut-off and a reduction in transmission efficiency. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a feature of the present invention, in the engine support structure for a working vehicle described at the beginning, when the belt transmission is in a no-load state, the rear side has a larger set amount than the front side. The engine in an oblique posture that is located only above and the lateral side portion on which the lateral output shaft is disposed is located a set amount above the opposite lateral side portion. The point is that it is mounted and supported on the frame.

[0005]

As described above, since the engine is mounted and supported in a three-dimensional oblique posture, when the driving load is increased and the belt tension is increased, the output of the rubber-mounted engine is increased due to the tension. When the shaft portion is inclined rearward and obliquely downward by receiving a pulling force, in a state where the driving load is large, the respective axes of the engine output shaft and the transmission case input shaft are substantially parallel to each other. as a result,
In a work state in which a large load is applied, the transmission belt in the belt transmission and the engine output side pulley are set to an appropriate sliding transmission state, and a good transmission state appears.

[0006]

Accordingly, the rubber transmission of the engine to the frame can be effectively prevented from transmitting the vibration of the engine to the body, but the proper transmission state of the belt transmission under a high load condition can be obtained. Will be
The transmission efficiency and durability of the belt transmission can be improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to an engine support structure of a riding type rice transplanter as an example of a work vehicle. FIG. 1 shows a front part of a traveling body of a riding type rice transplanter. An engine 2 covered with a bonnet 1 is provided at the front part of the body, and an output pulley 2b mounted on a lateral output shaft 2a of the engine 2. The transmission is transmitted to an input pulley 4b mounted on the input shaft 4a of the transmission case 4 via a belt transmission device 3 from the transmission. The engine 2 has an engine mounting base 5 connected to the lower surface thereof and the transmission case 4
Is supported by an engine mounting frame 7 connected to the front of the vehicle.

The anti-vibration support structure of the engine 2 is such that the front end side of the engine mounting base 5 is turned up and down around the horizontal axis by an engine mounting frame 7 via a bush-type anti-vibration rubber 8 whose axis is oriented in the horizontal direction. It is pivotally supported movably, and its rear end side is supported via an anti-vibration rubber 9 arranged in an inwardly inclined posture so as to face the center of the engine.

As shown in FIG. 2, the anti-vibration structure at the front end of the engine mounting base 5 is connected to a pair of left and right cylindrical brackets 5a connected to the lower surface of the engine mounting base 5 and an engine mounting frame 7. A rod-shaped pivot pin 10 is inserted between a pair of left and right brackets 7a, and a rubber bush 8 as a bush-type anti-vibration rubber is inserted between the cylindrical bracket 5a and the pivot pin 10. I have. The lateral gap between the cylindrical bracket 5a on the engine mounting base 5 and the bracket 7a on the engine mounting frame 7 is set to about 0.2 to 0.3 mm to suppress lateral play. It is.

The anti-vibration structure at the rear end of the engine mounting base 5 includes upper and lower bolts 9 as shown in FIGS.
The bolt 9a on the upper side of the vibration isolating rubber 9 formed by baking and fixing the rubber 9b between the a and 9a is attached to the engine mounting base 5.
The bolt 9a on the lower side is inserted and fixedly connected to the bolt through hole formed in the bracket 7b on the engine mounting frame 7 side, respectively.

When the belt transmission 3 is in a no-load state, the rear side is in an oblique posture in which the rear side is located above the front side by a set amount, and the lateral output shaft 2
The engine 2 is mounted and supported on the engine mounting frame 7 in such a state that the lateral side of the mounting side a is in an oblique posture positioned above the lateral side on the opposite side by a set amount. More specifically, the thickness of the anti-vibration rubber 9 on the rear end side of the engine mounting base 5 is set to be slightly thicker so that the rear side of the engine 2 is positioned at an angle above the front side by a set angle. It is composed. Also, as shown in FIG.
At the side of the horizontal output shaft 2a, the mounting portion 2c of the engine 2 and the engine mounting base 5 are bolted together in a tightened state with a spacer member 11 interposed therebetween. The output shaft 2a, that is, the output pulley 2b is configured so as to have an oblique posture in which the output shaft 2a is located slightly upward as it goes outward. This spacer member 11 has a thin plate structure, and is appropriately laminated and interposed according to load characteristics.

[Other Embodiment] Instead of the above-described structure in which the spacer member 11 is interposed between the engine 2 and the engine mounting base 5, the engine mounting base 5 is set so that the engine 2 is in a set oblique posture. Alternatively, the engine mounting frame 7 may be formed in a predetermined shape in advance.

[0013] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of a front part of a rice transplanter.

FIG. 2 is a plan view of an engine mounting portion.

FIG. 3 is a front view of an engine mounting portion.

[Explanation of symbols]

 2 Engine 2a Output shaft 3 Belt transmission 4 Transmission case 4a Input shaft 7 Frame 8,9 Anti-vibration rubber

Continued on the front page (58) Fields investigated (Int. Cl. ⁶ , DB name) B60K 5/12 B60K 5/04 F02B 61/06 F02B 77/00 F-term system (3D035CA29)

Claims (1)

(57) [Claims] 1. A lateral output shaft (2a) of an engine (2).
And a transverse input shaft (4a) of a transmission case (4) disposed diagonally rearward and lower side thereof are interlocked and connected by a belt transmission (3), and a front end side of the engine (2) is connected to a bush-type anti-vibration rubber ( 8) via a shaft (8) so as to be pivotally connected to the frame (7) so as to be rotatable up and down around a horizontal axis, and to support the rear end side of the engine (2) via a vertical vibration isolating rubber (9). An engine support structure for a working vehicle, wherein in a state in which the belt transmission (3) is in a no-load state, a rear side is positioned obliquely above a front side by a set amount and the slanting posture is set to be horizontal. The engine (2) is moved with respect to the frame (7) in a state in which the lateral side of the output shaft (2a) is in an oblique posture that is located above the lateral side on the opposite side by a set amount. The engine support structure of the work vehicle that is mounted and supported.