JPH0115532Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of mounting and connecting an engine on an engine base supported by a transmission case, and an output shaft protruding from one left and right side of the engine and one side of the transmission case from the left and right. This invention relates to an engine mounting structure for a mobile agricultural machine in which an input shaft protruding from the front is interlocked and connected to the input shaft by a belt transmission mechanism.

In the engine mounting structure having the above configuration, it is desirable to be able to adjust the center-to-axis distance between the output shaft of the engine and the input shaft of the transmission case in accordance with belt dimensional errors and belt elongation due to use. Generally, the engine is bolted to the base via a long hole in a direction perpendicular to the engine output shaft direction.

In anticipation of the machining error between the bolt hole pitch in the engine output axis direction on the engine mounting seat side and the bolt pitch in the same direction on the engine base side, the width of the bolt hole is made into a long hole for engine position adjustment. It is set slightly larger than the bolt diameter.

However, if the width of the elongated hole is made larger than the bolt diameter in this way, assembly errors in the width direction of the elongated hole may cause positional errors between the engine and the transmission case in the engine output axis direction, or The engine is slightly tilted in plane with respect to the case, the parallelism of the output shaft and input shaft is lost, and the rotation surfaces of the pulleys attached to both shafts are no longer in the same plane, causing the belt to There is a risk of premature wear, and positioning during engine assembly requires considerable effort.

The present invention was developed in light of these circumstances, and it enables the center-to-center distance to be adjusted while maintaining the parallelism of the engine to the transmission case, and improves the strength of the engine mounting. The purpose is to

Embodiments of the present invention will be described below based on the drawings.

Fig. 1 shows a riding rice transplanter as an example of a mobile agricultural machine, in which an engine mounting frame 3 fixed to the transmission case 2 is attached to the front part of a transmission case 2 that supports steerable front wheels 1, 1. An engine 4 is connected through the transmission case 2, and a rear transmission case 7, which pivotally supports rear wheels 6, is connected to the rear ends of a pair of left and right main frames 5 extending rearward from the transmission case 2.
Further, a seedling planting device 9 is attached to a frame 8 fixed to the rear end of the main frame 5, and a parallel quadruple link mechanism 10 is connected to the seedling planting device 9.
and are connected via a hydraulic cylinder 11 so that they can be driven up and down. The engine 4 is mounted horizontally, and its output shaft 12 and the input shaft 13 of the transmission case 2 are interlocked and connected by a belt transmission mechanism 14 equipped with a tension main clutch function, and the speed can be changed as appropriate within the transmission case 2. The generated power is transmitted to the left and right front wheels 1, 1 via the differential transmission inside the transmission case 2, and a part of the shifting power is transmitted to the rear transmission case 7 via the transmission shaft 15. The power is transmitted to the left and right rear wheels 6, 6 via the left and right steering clutches, respectively, and the power separately derived from the transmission case 2 is axially transmitted to the transmission case 16 of the seedling planting device 9. It's getting old.

Next, the mounting structure of the engine 4 will be explained with reference to FIGS. 2 to 4.

The engine mounting frame 3 is constructed by connecting a pair of left and right vertical side plates 3a, 3a with a flat plate stay 3b, and the rear ends of the side plates 3a, 3a are connected to the left and right outer surfaces of the transmission case 2. The bent portion of the rear end of the stay 3b is bolted to the front surface of the transmission case 2.

At the upper part of each outer surface of the left and right side plates 3a, 3a,
Brackets 17a and 17b made of plate material bent into an L shape
are fixed by welding in pairs at the front and rear. When viewed from the side, the front bracket 17a has an inclined surface of 45° so that its upper surface faces rearward and upward, and the rear bracket 17a
On the contrary, the upper surface of 7b is configured to be an inclined surface facing forward and upward at an angle of 45 degrees.

These front, rear, left and right brackets 17a,
An engine base 19 made of sheet metal is mounted and connected to each of the inclined upper surfaces of 17a, 17b, and 17b via anti-vibration rubber 18.

As shown in FIG. 5, the vibration isolating rubber 18 is formed into a short cylindrical shape, and has reinforcing plates 18a,
18b is baked and fixed, and connecting bolts 18 are provided on the upper and lower outer surfaces of each reinforcing plate 18a, 18b.
c and 18d are erected and fixed at right angles to the reinforcing plate surface.

Further, the engine base 19 has front and rear end sides 19a, 19a, which are attachment parts to the vibration isolating rubber 18.
is bent to form an inclined surface parallel to the upper surface of the corresponding brackets 17a and 17b, and
A horizontal engine mounting portion 19b is formed in the middle of the front and back, and a lower mounting seat of the engine 4 is placed on this engine mounting portion 19b, and a bolt 20 is inserted through the mounting seat and the engine mounting portion 19b.
The connection is fixed.

The front and rear bolt holes 21, 21 located on the output shaft protruding side of the engine mounting seat are configured as round holes with a diameter that allows the bolts 20 to be inserted tightly, and the front and rear bolt holes located on the opposite side 22, 22
are configured as left and right elongated holes with the same front and rear width as the bolt diameter, and on the other hand, all the bolt holes 23 on the engine base 19 side are configured as front and rear long holes with the same left and right width as the bolt diameter.

The engine mounting structure of the present invention is constructed as described above, and there is no left-right play between the front and rear bolt holes (round holes) 21, 21 located on the output shaft side and the bolt holes (long holes) 23, 23 on the base side. Bolt without attachment 2
0 and 20, the horizontal position of the engine 4 with respect to the transmission case 2 and the attitude of the engine output shaft 12 are regulated by the support at these two front and rear points, and the output of the engine 4 is The two bolt connections on the front and back on the opposite side of the shaft protrusion are
Since the engine base 19 side is configured with front and rear elongated holes, and the lower mounting seat side of the engine 4 is configured with left and right elongated holes, respectively, the left and right positions of the engine 4 and the attitude of the engine output shaft 12 are regulated as described above. This makes it possible to perform bolt connection while allowing machining errors in the longitudinal and lateral directions of the bolt holes formed in the lower mounting seat of the engine 4 and the engine base 19. Therefore, in this state, even if the engine 4 is adjusted back and forth, the parallelism and left-right relative position between the output shaft 12 and the input shaft 13 are always kept constant.

In addition, the bolt 2 at the front connection part of the engine 4
An adjustment bolt 24 is fixed to the washer 0, and this is inserted into the front upright side of the engine base 19 and a nut 25 is attached, so that the engine 4 can be finely adjusted longitudinally by operating the nut 25. It is configured. In addition, when setting the distance between the axes of the engine output shaft 12 and the transmission case input shaft 13 to a constant value, as shown in FIG. It is convenient to use a jig 27 which has bosses 27a and 27b attached to both ends to be fitted externally. In addition, in order to correct the height of the engine base 19, correct the overall inclination, etc., the anti-vibration rubber 18 and the bracket 17 are installed.
It is preferable to use a shim or washer 29 having a slit 28 that can be inserted from the side of the bolt between the vibration isolating rubber 18 and the engine base 19 or between the vibration isolating rubber 18 and the engine base 19.

As described above in the embodiments, the configuration of the engine mounting structure of the present invention is such that the mounting seat of the engine 4 and the engine base 19 are connected by bolts 20 at four locations in the front, rear, left and right, and the engine output shaft 12 is connected to the engine base 19 at four locations. The two front and rear bolt connecting parts on the protruding side are provided with elongated holes extending only in the front and rear direction perpendicular to the axis of the engine output shaft 12, and the left and right widths of the elongated holes are connected by the bolts. 20... and the front and rear 2 on the opposite side to the protruding side of the engine output shaft 12.
Since the bolt connection portions at the locations are characterized by flexibility in the front, rear, and left and right directions, the bolt connection portions at the front and rear locations have two holes that have elongated hole flexibility only in the front and rear directions perpendicular to the engine output shaft axis. Using this technology, the engine can be adjusted longitudinally while maintaining the parallelism of the output and output axes of the transmission case 2 and the engine 4, as well as the left and right positioning, allowing the engine to be assembled properly with very little assembly error. Belt transmission is now possible.

In particular, the bolt connection part that only accommodates the front and rear elongated holes that determines the engine posture is placed on the engine output shaft protruding side, which reduces the planar turning moment of the engine due to the belt tension acting on the engine output shaft protruding end. This made it possible to reduce the load on the bolts that resist this turning moment, increasing the engine support strength as a whole.

In other words, considering only the positioning of the engine 4, the same function as the present invention can be achieved even if the bolt connection part with no left and right flexibility is placed on the opposite side of the engine output shaft protruding direction, as shown in Fig. 6. do. However, when looking at the support strength when the engine 4 receives a planar counterclockwise turning moment M due to the belt tension F acting on the protruding end of the output shaft 12, if the connecting portion A is flexible in the front, rear, left and right directions, When the bolt tightening force decreases, the bolts at the front and rear connecting portions B, which have no left and right flexibility, will support this planar turning moment M.
Since this turning moment M is the product of the vertical distance L from the joint B, which has no left-right flexibility, to the belt tension line of action and the belt tension F, the shorter the distance L, the smaller the turning moment. As is clear, the structure of the present invention, in which the connection part with no left-right flexibility is on the output shaft side, has a smaller turning moment than the one in Figure 6, and the bolt shear stress is correspondingly smaller, making it more durable. be.

Also, when adjusting the front and back of the engine, you will need to check the distance between the shafts and belt tension from the protruding side of the engine output shaft, so if there is a bolt connection part that only accommodates the front and rear long holes on this operation side, After fixing the engine by operating the bolts on this side, you can fix the bolts on the connecting part located on the opposite side, which has flexibility in the front, rear, left, and right sides.
There is no need to move the engine left and right many times for retightening, etc., and adjustment and fixing operations can be performed efficiently, which is effective in increasing productivity.

Furthermore, since the two front and rear bolt connections on the opposite side of the protruding side of the engine output shaft are provided with front, rear, left and right flexibility, the left and right positions of the engine and the attitude of the engine output shaft are regulated by the long hole flexibility. This allows reliable bolt connection while allowing machining errors in the front and back direction of bolt holes formed in the lower engine mounting seat and engine base.

As is clear from the above effects, in the present invention, the bolt connection part on the protruding side of the engine output shaft has elongated hole flexibility only in the front and back direction without flexibility in the left and right directions, and the bolt connection part on the opposite side has flexibility in the front and rear directions. For example, the relationship of the bolt holes shown in the embodiment may be reversed between the engine mounting seat side and the engine base side. Alternatively, all the bolt holes on the engine base side may be threaded holes, and the bolt holes on the engine mounting seat may be provided with the above-mentioned flexibility.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the engine mounting structure for a mobile agricultural machine according to the present invention, in which Fig. 1 is an overall side view of a riding rice transplanter, Fig. 2 is a partially cutaway side view of the engine mounting part, and Fig. 3 is a side view of the riding rice transplanter. FIG. 4 is a plan view of the engine mounting portion, FIG. 4 is a cross-sectional view taken along the line -- in FIG. 2, FIG. 5 is a vertical cross-sectional view of the vibration-proof rubber, and FIG. 6 is a plan view of a comparative structure. 2...Mission case, 4...Engine, 1
2... Engine output shaft, 13... Mission case input shaft, 14... Belt transmission mechanism, 19... Engine base, 20... Bolt, 21... Round bolt hole, 22... Long hole bolt hole, 23...Long hole bolt hole.

Claims (1)

[Claims for Utility Model Registration] 1. An engine 4 is mounted and connected to an engine base 19 supported by a transmission case 2, and an output shaft 12 protrudes to one left and right side of the engine 4.
and an input shaft 13 protruding from one left and right side of the transmission case 2 are interlocked and connected by a belt transmission mechanism 14, and the mounting seat of the engine 4 and the engine base 19 Attach the bolts 2 at 4 locations on the front, rear, left and right
0... At the same time, elongated holes are provided in the two front and rear bolt connection parts on the protruding side of the engine output shaft 12 only in the front-rear direction perpendicular to the axis of the engine output shaft 12, and the elongated holes The left and right width of the flexibility is set to be the same as the diameter of the bolts 20 for connection, and the front and rear and left and right widths of the bolt connections on the opposite side of the protruding side of the engine output shaft 12 are provided with the right and left widths. An engine mounting structure for a mobile agricultural machine, characterized by being provided with. 2. The two front and rear bolt holes 21, 21 on the output shaft protruding side of the engine mounting seat of the engine 4 are round holes through which the bolts 20 are inserted tightly, and the two front and rear bolt holes 22 on the opposite side of the engine mounting seat are round holes. ，
22 is an elongated hole along the axial direction of the engine output shaft, and all four bolt holes 23 of the engine base 19 are elongated holes in a direction perpendicular to the engine output shaft axial center. The engine mounting structure of the mobile agricultural machine described in scope 1.