JP3354239B2 - Engine anti-vibration force extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for extracting an anti-vibration force of an engine for driving various types of working equipment.
The present invention relates to an improvement in which an engine is mounted on a support via an elastic support member, and a power take-out member is connected to the output shaft of the engine via a displacement absorbing joint.

[0002]

2. Description of the Related Art Like an automobile, the output shaft of an engine and
When the driven member to be driven, such as a wheel, is far away, the engine is supported on the support via an elastic support member, and the output shaft of the engine is connected to the driven member via a cardan shaft. Therefore, it is already known that the vibration of the engine is not transmitted not only to the support but also to the driven member.

[0003]

However, when the output shaft of the engine and the power take-out member are arranged close to each other, there is no actual means for preventing vibration of the engine from being transmitted to the power take-out member.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a structure in which a power take-out member is disposed close to an output shaft of an engine, but vibration of the engine is not transmitted to the power take-out member. An object of the present invention is to provide a vibration-proof force extracting device.

[0005]

In order to achieve the above-mentioned object, the present invention provides an engine having a support having an engine with an output shaft directed horizontally through an elastic support member. A power take-out member outside the support body connected to the output shaft of the engine via a displacement absorbing joint, wherein the displacement absorbing joint comprises a first joint body connected to the output shaft of the engine;
When supported rotatably on the support via bearings
The second joint member that will be connected to the power takeoff member through the support, between two fitting body is composed of a elastic member for elastically connecting is disposed between the support and the engine 1
Via the two displacement absorbing joints and the two elastic support members.
The first feature is that the engine is supported by the support at three points .

[0006] is found in the present invention, in addition to the first feature, support and between an engine, an output shaft second that the displacement in the axial direction of the engine provided with a regulating means for regulating a constant It shall be the feature of.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

[0008] First, a description than the actual施例shown in FIGS. 1-8. 1 to 3, an engine bed 1 as a support is fixed to a frame F of a power cultivator by bolts 4. The engine bed 1 is composed of a horizontal bottom plate 1a, a vertically standing side plate 1b, and a pipe frame 1c connecting these, and has an L-shape.
A pair of elastic support members 3, 3 arranged in the front-rear direction of the power cultivator are attached to the bottom plate 1a, and the bottom of the engine 2 is supported via these elastic support members 3, 3. The engine 2 is arranged such that a crankshaft 2a as an output shaft thereof is directed in the left-right direction of the power cultivator. That is, it is a horizontal type engine.

The displacement absorbing joint 5 of the present invention is provided on the side plate 1b.
The crankshaft 2 a of the engine 2 is connected to the first and second drive pulleys 6 ₁ and 6 ₂ via the joint 5. The first driving pulley ₆₁ is connected to the driven pulley 8 fixed to the transmission input shaft 7 of the power tiller via the belt 9 _1, the second driving pulley 6 ₂ (not shown) via a belt 9 ₂ working machine Alternatively, it is connected to auxiliary equipment. And the first
Moving pulley ₆₁ constitutes the power take-off member of the present invention.

4 to 6, a displacement absorbing joint 5
The main components are a first joint body 13, a second joint body 14, an intermediate body 15, and a plurality of first and second elastic members 16 and 17 for elastically connecting these members. Molded.

The first joint body 13 is formed by projecting a pair of first transmission fins 13f arranged on one diameter line on the outer periphery of the first hub 13h.

The second hub 14h of the second joint body 14 is
The transmission fin 13f is disposed so as to surround the first hub 13h with the cutout 18 penetrating therethrough. This second hub 1
A pair of second transmission fins 14f are provided on the outer periphery of 4h in a direction orthogonal to the first transmission fins 13f.

The intermediate member 15 includes first and second transmission fins 13.
rim 15r surrounding the f and 14f groups, and the rim 15r
The first and second transmission fins 13f, 1
4f, four intermediate fins 15f intervening between the first transmission fin 13f and an intermediate surface of the intermediate fin 15f adjacent to the first transmission fin 13f are connected via a first elastic member 16, and The opposing surfaces of the first transmission fin 13f and the intermediate fin 15f adjacent thereto are connected via the second elastic member 17. Baking, bonding or the like is used for joining each elastic member to each fin.

[0014] notched portion 18 with one or both the first elastic stopper member 19 ₁ rubber in the rotational direction surface facing the first transmitting fin 13f of the second hub 14h is attached.

The first and second transmission fins 13f, 14
one or both of the radial surface facing the f and the rim 15r second elastic stopper member 19 made of rubber ₂ is attached to.

In the above, the intermediate 15 is composed of the first and second
It is formed of a material having a lower density than the joint bodies 13 and 14. For example, when the first and second joint bodies 13 and 14 are made of iron,
The intermediate 15 is made of a light alloy or a synthetic resin.

The first hub 13h has the crankshaft 2a
Is fixed by bolts 21.

The second hub 14h has a cylindrical shaft 22 protruding outward of the intermediate body 15 on the side opposite to the crankshaft 2a. An inner race of a ball bearing 23 is fitted to the cylindrical shaft 22, and an outer race thereof is provided. Is held by a bearing holder 26 fixed to the outer surface of the side plate 1b of the engine bed 1 with bolts 24. Thus, the first and second transmission fins 13f and 14f, the intermediate body 15, and the first and second elastic members 1
6 and 17 are arranged inside the side plate 1 b of the engine bed 1.

The outer end and the inner end of the second hub 14h are first and second mounting portions 27 ₁ and 27 ₂ having screw holes 25 ₁ and 25 ₂ as pulley mounting holes, respectively. The first and second drive pulleys 6 ₁ and 6 _{2 are} screw holes 2
5 ₁ is fixed by the 25 ₂ bolts 28 ₁ screwed into, 28 _2.

2, 7 and 8, the engine 2
The bracket 29 is fixed to the joint 5 side end face with a bolt 36. This bracket 29 is mounted on the engine bed 1
A pair of lugs 29a, 29a extending upwardly inside the side plate 1b and being arranged along the side plate 1b, and each lug 29a has an interval in the axial direction of the crankshaft 2a. Then, a pair of stopper pieces 30 and 31 facing each other are fixed by bolts 32. These stopper pieces 30,
A support piece 34 fixed to the side plate 1b of the engine bed 1 with bolts 33 is inserted and disposed in the center between the support pieces 31. The support piece 34 has both end faces on both stopper pieces 30 and 31 at a fixed interval. Grommet-shaped elastic members 3
5 are attached, and these constitute a restricting means 10 for restricting the axial displacement of the engine 2 to be constant.

Next, the operation of this embodiment will be described.

When the engine 2 is operated, the rotational torque of the crankshaft 2a is transmitted from the first joint 13 to the first and second elastic members 16, the intermediate member 15, and the second joint 14 in order.
The power is transmitted to the second driving pulleys 6 ₁ and 6 ₂ , and further, the belt 9 ₁ ,
9 ₂ through respectively transmitted to a predetermined load, and drives them.

During this time, one of the plurality of first elastic members 16 which is adjacent to the first transmission fin 13f in the rotational direction R (see FIG. 5) is compressed by the rotational torque and is adjacent to the first transmission fin 13f in the rotational direction R. Is pulled. Further, in the plurality of second elastic members 17, those adjacent to the second transmission fin 14f in the rotation direction R rear are compressed, and those adjacent in the rotation direction R front are pulled.

Thus, the first and second elastic members 16 and 17
Performs torque transmission with compression and elongation deformation,
The torque fluctuation can be absorbed. In addition, the first and second elastic members 16 and 17 which are particularly compressed by the rotational torque
Exhibits high spring constant characteristics, enabling high torque transmission. At that time, the increase in the relative rotation angle between the two joint members 13, 14, first, the compression deformation of the second elastic members 16 and 17 goes above a predetermined value, the first elastic stopper member 19 ₁ is first transfer fins 13f Between the first transmission fin 13f and the second hub 14h.
While avoiding an abutting contact with the motor, an excessive increase in the relative rotation angle can be suppressed.

The vibration of the engine 2 is absorbed by the pair of elastic support members 3 and 3 and the displacement absorbing joint 5. In particular, when an eccentric load or an eccentric load is applied to the crankshaft 2a due to the vibration of the engine 2, the first and second elastic members 16, 17
The elastic members 16 and 17 exhibit relatively low spring constant characteristics against shearing and torsion, and therefore, the first joint body integrally connected to the crankshaft 2. The eccentric and eccentric movements of 13 are smoothly absorbed. At this time, if the shear deformation of the first and second elastic members 16 and 17 progresses to a predetermined value or more, the first and second transmission fins 1
3f, now the second elastic stopper member 19 ₂ is compressed between the 14f and the rim 15r, first, second transfer fins 13f, avoid shocking abutment between 14f and the rim 15r Shitsusu , Excessive eccentricity of the first joint body 13 can be suppressed.

On the other hand, since the second joint body 14 integrally connecting the drive pulleys 6 ₁ and 6 ₂ is supported on the engine bed 1 via the bearing 23, the eccentricity of the first joint body 13 is reduced.
Irrespective of the eccentric movement, the second joint body 14 does not vibrate, can maintain a constant position, and can prevent transmission of vibration to the belts 9 ₁ and 9 ₂ .

As described above, since the displacement absorbing joint 5 exhibits an elastic supporting function for the engine 2, only one elastic supporting member 3 for supporting the bottom of the engine 2 is sufficient. After all,
The engine 2 is supported at three points.

The head of the engine 2 has a crankshaft 2a.
When a large swing is caused in the axial direction of the engine bed, a pair of stopper pieces 30, 31 swinging together with the engine 2 alternately contact the elastic member 35 supported by the support piece 34 on the engine bed 1 side to compress the deformation. As a result, an excessive increase in the swing amount of the engine 2 can be suppressed in a buffered manner.

Further, in the displacement absorbing joint 5, since the intermediate member 5 having the largest diameter is formed of a material having a lower density than the first and second joint members 13 and 14, there is a slight weight imbalance. during high-speed rotation also, Ru it is possible to prevent the occurrence of large become vibration.

[0030] In the above real施例, without departing from the gist of the present invention, various design changes are possible. For example, the engine bed 1 can be formed integrally with the frame F of the power cultivator or the blade case C of the power lawn mower.

[0031]

As described above, according to the first aspect of the present invention, the first absorber for connecting the displacement absorbing joint to the output shaft of the engine is provided.
A joint body, a second joint body connected to the power take-out member, and an elastic member elastically connected between the two joint bodies. The second joint body is rotatably connected to the support via a bearing. Even if the power take-out member is located close to the output shaft of the engine, the transmission of vibration to the power take-off shaft is prevented by the absorption of the engine vibration by the elastic member and the immovable support by the bearing of the second joint body. Can be. Moreover, the output shaft
Engine with two horizontal support members and one elastic support member
Three points on a support through the displacement absorbing joint of
Therefore, by utilizing the elastic support function of the displacement absorbing joint,
It can be used as the engine elastic support means itself.
So that only two elastic support members for the engine are sufficient
Therefore, the engine elastic support structure has been simplified,
This can contribute to a reduction in strike.

Also, in particular, the space between the engine and the support
The displacement absorption joint is located at
Protection from the engine and the engine support itself is altered.
The protective structure can be simplified because it can be
And can contribute to further cost savings.
The displacement absorption joint of the squid is used as much as possible for the engine that is the vibration source.
Closer (therefore, the engine vibration is not significantly amplified
Since the to) placed transmitted to the joint, variable of relatively small capacity
Vibration absorption can be effectively performed with
Savings are achieved.

Further, according to the second feature of the present invention, the regulating means for regulating the displacement of the engine in the axial direction of the output shaft is provided between the support and the engine. The vibration of the engine can be suppressed moderately to prevent an excessive load in the axial direction from being applied to the displacement absorbing joint, and its durability can be ensured.

[Brief description of the drawings]

Side view of a power tiller showing the actual施例Next Patent

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a perspective view of a displacement absorbing joint.

FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 2;

8 is a sectional view taken along line 8-8 in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine bed as a support 2 Engine 2a Crankshaft as an output shaft of an engine 3 Elastic support member 5 Displacement absorption joint 6 ₁ First drive pulley as a power take-out member 10 Restriction means 13 First joint body 14 Second joint body 16 elastic member 17 elastic member 23 bearings

Continued on the front page (56) References JP-A 3-130935 (JP, U) JP-A 63-76530 (JP, U) JP-A 62-132817 (JP, U) JP-A 61-134431 (JP) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 3/00 B60K 5/04 F16F 15/08 F16F 15/12

Claims (2)

(57) [Claims] 1. An output shaft (2a) is horizontally mounted on a support (1).
The engine (2) is mounted via an elastic support member (3), and power is taken out of the support (1) via a displacement absorbing joint (5) to an output shaft (2a) of the engine (2). were ligated member _(61), the stabilization force output of an engine, the displacement absorbing joint (5), the output shaft of the engine (2) (2
The first joint body (13) connected to a) and the support body (1)
When supported rotatably via bearings (23)
Connected to the power take-off members ₍₆₁₎ through said support (1) to
Second joint member that will be (14), both fitting bodies (13, 14)
And an elastic member (16, 17) for elastically connecting between the support (1) and the engine (2).
It is disposed, and one of said displacement absorbing joint (5), two of said elastic supporting
The engine (2) is connected to the support (1) via the member (3).
An anti-vibration force output device for an engine, characterized by being supported at three points . Between 2. A supporting bearing member (1) and the engine (2), that the displacement of the output shaft (2a) axially of the engine (2) provided with a regulating means (10) for regulating a constant The engine vibration isolating force extracting device according to claim 1 , characterized in that: