JPS6340329Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an engine vibration isolation structure in a belt transmission structure used in agricultural equipment such as a combine harvester. Regarding an engine with a belt transmission structure, in which a driven shaft is disposed on one side, and the output shaft and the driven shaft are interlocked and connected by a belt transmission structure having a tension clutch, by the movement of the tension pulley, This invention relates to vibration isolation for an engine with a belt transmission structure that changes the tension of the belt to turn power transmission on and off.

Utility patent application No. 56-5447, which is an earlier application, describes the power transmission mechanism and tension loading method for small combine harvesters.
This will be explained using No. as an example.

FIG. 1 is a schematic side view of the entire combine harvester of the earlier application. 5, a clutch lever 6, etc. are provided. An engine 7 is provided below the seat 5, and its output is transmitted to a traveling mission case 8 by belt transmission structures B and B as shown in FIG.
and the input shaft 10 of the threshing section 3, respectively. The driving force transmitted to the traveling transmission case 8 is further transmitted to the traveling crawler 2 and the reaping section 1.

FIG. 3 is a schematic diagram showing the power transmission structure B of the engine 7, in which the rotational power of the engine is transmitted through the belt 1.
1 and 11 to the respective input shafts 9 and 10 on the left and right sides of the engine 7, tension pulleys 12 and 12 are in contact with the belts 11 and 11, Further, the members on which the tension pulleys 12, 12 are mounted are connected to the clutch levers 6, 6, respectively, and are configured to swing around swing shafts 13, 13.

In this way, by operating the clutch levers 6, 6, tension can be applied or removed separately to both belts 11, 11, and power can be transmitted or disconnected. It constitutes A.

In a belt transmission structure having such a tension clutch, the tension of the belts 11, 11 changes when the clutch is engaged or disengaged, so that the force from the belts 11, 11 acting on the output shaft of the engine changes.

Conventionally, as shown in FIG. 4, this engine 7 is mounted on mounting tables 15, 15 through vibration isolating materials 14, 14, which are arranged at an angle to dampen vibrations in the vertical and horizontal directions. It was set up as
In this case, since the vibration isolating materials 14, 1
Since compressive stress and shear stress act on No. 4, the initial stress is high, which is disadvantageous in terms of durability.

In addition, since it is used both in the vertical and horizontal directions, it is difficult to satisfy the vibration damping performance for either side. Then, the engine 7 swings too much from side to side due to the above-mentioned side force, which applies a shocking force to the loosened belt 11, causing it to be damaged quickly, and conversely,
Hard vibration isolating material 1 to prevent engine 7 from shaking too much
If No. 4 or No. 14 were used, the vibration damping performance would deteriorate.

In view of the above circumstances, the present invention aims to provide vibration isolation for an engine with a belt transmission structure while preventing abnormal vibrations of the engine.

In order to achieve this object, the vibration isolation structure for an engine with a belt transmission structure of the present invention is such that the engine is supported on a mounting table via a vibration isolation material that receives a load in a vertical direction, and the output shaft A fixing member arranged opposite to a side wall, which is an end face of the engine in the left and right direction with respect to the axis of the , a base end of a cushion material that receives a horizontal load is attached to the output shaft opposite to the vibration isolating material side, and a free end surface of the cushion material and a side wall to which the cushion material is not attached. or between the fixed member,
A configuration is adopted in which a gap is provided that is smaller than an amplitude permissible range on the left and right sides of the engine due to the elongation of the belt of the belt transmission structure.

Normally, there is a considerable distance between the vibration isolator and the output shaft of the engine in the vertical direction, so the vibration isolator counteracts the lateral force on the output shaft due to belt tension at an offset position. Since the engine tilts left and right around the vertical position of the vibration isolator, the horizontal component of force at that point becomes smaller as it moves toward the opposite side of the output shaft from the vibration isolator. go. Therefore, if a cushion material is provided in such a position to restrict excessive vibration by adopting the above-mentioned configuration, the contact force will be small, so it can be dealt with with a simple configuration, and it will reduce the vibration damping performance. Not at all.

In addition, by providing a separate cushion, it is possible to select a soft vibration isolating material that is appropriate for the weight of the engine, so it has better vibration isolating performance than conventional ones that also serve as a lateral stopper. By making sure that the vibration isolating material is able to sufficiently vibrate, the vibrations in the left and right sides of the engine can be prevented, and excessive vibrations can be stopped by the contact of the cushioning material. At the same time, changes in belt tension are prevented by the fixing member via the cushioning material before excessive tension is applied to the loosened belt, thereby preventing shocking excessive tension from being applied to the belt. Ta.

In addition, by providing the above-mentioned gap, the normal vibration-proofing effect against small-amplitude vibrations caused by the vibration-proofing material can be sufficiently exhibited. Even when the cushion is supported, the cushion material has the advantage of cushioning the impact.

Furthermore, since the vibration isolating material is installed horizontally,
When installing the engine, only horizontal alignment is required, which reduces engine installation time compared to the conventional method that uses inclined vibration isolators that require both horizontal and vertical alignment. At the same time, it also improves the durability of the vibration isolating material.

Hereinafter, embodiments will be described based on the drawings.

As shown in FIG. 5, the engine 7 is mounted on a mounting table 16 with a vibration isolating material 17 such as vibration isolating rubber that receives a vertical load.
loaded through the side walls 7'' on both sides of the engine 7,
7″ is a cushion material 19 made of hard rubber, etc.
19, both opposing fixing members 1 fixed to the fuselage;
8, 18 so as to leave a small gap 20, 20 between them, and to be located on the opposite side of the vibration isolating material 17 with respect to the output shaft 7'.

FIG. 6 shows another embodiment in which, in addition to the embodiment shown in FIG. 5, a spring 21 is provided across the side wall 7'' of the engine 7 and the fixing member 18,
As a result, a space 20 is secured on both the left and right sides of the engine 7.

Further, in FIGS. 5 and 6, the cushion material 19 may be fixed to the fixing member 18 side.

FIG. 7 also shows another embodiment, in which the bent member 22
is attached to be swingable around a support shaft 23, and cushion members 19, 19 are provided at both ends thereof, and one end is secured by a spring 24 while maintaining a gap 20 between the side wall 7''. Therefore, when the engine 7 swings, the curved member 22 swings and the cushion members 19, 19 at both ends thereof swing.
It can be accepted by coming into contact with it.

FIG. 8 shows another embodiment, in which the engine 7 swings from side to side and presses the limit switch 26, which activates the switch and operates the solenoid valve V to send pressurized oil to the cylinder 25 and use the force of this cylinder 25 to force the limit switch 26. This is to suppress vibration. In FIG. 8,
P is a hydraulic pump, and 27 is a spring, which usually positions the cushion material 19 at a set position and functions as a cushion. Reference numeral 28 denotes a control circuit, which normally connects the limit switch 26 and the solenoid valve V, and once the limit switch 26 is turned on, after a certain period of time it cuts off the connection between the limit switch 26 and the solenoid valve V, causing the cylinder 25 to contract. When the limit switch 26 is turned off, it is made conductive again. This limit switch 26 is located on the cushion material 19 and turns on a little earlier than the engine 7 touches the cushion material 19, thereby compensating for the delay in the hydraulic system. The engine mounting structure is the same in these embodiments.

Not limited to the embodiments, the present invention is not concerned with the direction in which the engine 7 is mounted on the fuselage, and whether there is one or more belt transmission structures on each of the left and right sides of the engine, one belt transmission structure may be provided on each side of the engine. Alternatively, the present invention can be implemented regardless of whether there are a plurality of them.

Incidentally, 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]

Figure 1 is a schematic front view of a small combine harvester, Figure 2 is a schematic diagram of the power transmission system, Figure 3 is a schematic diagram of the power transmission near the engine, and Figure 4 is a side view showing a conventional engine loading structure. It is a diagram. 5 to 8 show an embodiment of the vibration isolation structure for an engine with a belt transmission structure according to the present invention, FIG. 5 is a front view showing the engine loading structure and the vibration isolation structure, and FIG.
8 to 8 are front views showing main parts of different embodiments. 7...engine, 7'...output shaft, 7''...side wall, 17...vibration isolator, 9...driven shaft, A...tension clutch, 18...fixing member, 16...mounting table, B...Belt transmission structure, 19...Cushion material, 19'...Free end surface, 20...Between.

Claims (1)

[Scope of utility model registration request] A driven shaft 9 is disposed on at least one of the left and right sides with respect to the axis of the output shaft 7' of the engine 7, and a belt transmission structure B having a tension clutch A is connected to the output shaft 7' and the driven shaft 9. In this engine, the engine 7 is supported on mounting tables 16, 16 via a vibration isolator 17 that receives vertical loads, and the axis of the output shaft 7' is a side wall 7″, which is an end face of the engine 7 in the left-right direction;
Fixing member 18,1 arranged opposite to 7″
8 is fixed to the mounting bases 16, 16, and the vibration isolating material is fixed to the output shaft 7' on either one of the fixing members 18, 18 or the side walls 7'', 7'' and in the vertical direction. The proximal end of a cushion material 19 that receives a horizontal load is attached to the side opposite to the 17 side, and the free end surface 19' of this cushion material 19
and the side walls 7'', 7'' to which the cushion material 19 is not attached or the fixed member 18, from the permissible amplitude range of the left and right sides of the engine 7 due to the elongation of the belt of the belt transmission structure B. A vibration-proofing structure for an engine with a belt transmission structure, characterized in that a vibration isolation structure is provided with a small diameter.