JPS5837203Y2 - rotary work machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary working machine, and particularly to a center drive type rotary working machine in which a rotary main cover is supported in a vibration-proof manner.

A center drive type rotary work machine consists of a rotary transmission case that has a built-in wrap-around transmission or gear transmission that drives the claw shaft approximately in the center, and a rotary cover that covers the upper part of the claw shaft. Usually, it is directly attached to a fixture attached to the low-rise transmission case.

That is, to outline this conventional example with reference to FIG. 1, a rotary transmission case 1 has a gear case 2 and a transmission case 3 integrally, and support arms 4 are fixed to both sides of the gear case 2. A plate-shaped fixture 5 is fixed to the part.

The rotary main cover 6 has a fitting 7 having a generally arch-shaped cross section fixed to the upper surface corresponding to the fitting 5 by welding or the like, and the lower end of the fitting 5 is inserted into the fitting 7, and the insertion end 8 This insertion end 8 is fixed to the inner surface of the fixture 7 by welding or the like.

However, in this conventional example, the vibrations of the gear case 2 and the transmission case 3, that is, minute vibrations, are directly transmitted to the rotary main cover 6, and the rotary main cover 6, which is usually made of a thin metal plate, has the disadvantage that the vibrations are amplified as noise. There is.

In addition, the rotary main cover 6 has a function of crushing soil by impacting the soil raised by the tilling claws of the claw shaft (omitted in Figure 1), so the cover 6 itself generates large vibration noise. This noise is due to the
There is a problem in that the resonance fork becomes malfunctioning and amplified by the noise due to minute vibrations transmitted from the resonance fork, and generates significant noise.

Therefore, there is also the problem that the rotary main cover 6 cannot be formed from an extremely thin metal plate in consideration of noise, and that the weight of the device cannot be expected to be reduced.

Therefore, in Utility Application No. 50-155343 (Japanese Utility Model Publication No. 52-67811), the applicant proposed a technique that supported the rotary main cover and expected some results. The cover and the rotary machine frame are connected by vertical bolts, and an elastic body is fitted around the bolts, so even though the vibrations caused by collisions with tilled soil can be dampened, the bolts may not connect to the cover at this time. It was discovered that since it was directly connected to the machine frame (steer →) and could not rub against it and absorb even the slightest vibrations, vibration noise was still generated.

In view of the above, the present invention buffers and absorbs minute vibrations from the rotary transmission case when they are transmitted to the rotary main cover, thereby preventing the generation of the above-mentioned noise. To provide a center drive type rotary work machine which absorbs vibration through the same elastic body (vibration isolating material), reduces vibration noise, and can be expected to be lightweight by forming the rotary main cover from an extremely thin metal plate. That is the main purpose.

Therefore, in the present invention, the rotary main cover that covers the upper part of the pawl shaft is supported by the rotary transmission case via a mounting fixture and a support in which vibration isolating material is interposed between each other, and the pawl shaft is driven by a center drive system. In the rotary transmission case and the rotary main cover, the mounting tool and the support tool are provided on the rotary transmission case and the rotary main cover at a position that corresponds to the width direction and front-rear direction of the rotary main cover, and the mounting tool and the support tool are installed in the direction of work progress. The main cover is connected only through a vibration isolating material fitted around the outer periphery of a shaft that is orthogonal and parallel to the axial direction of the pawl shaft, and the main cover is supported with respect to the rotary transmission case by the vibration isolating material. .

The embodiment according to the present invention will be described below in detail based on the drawings. In FIG. 12 and a known three-point link mechanism consisting of a lift arm 13.

In FIGS. 2 and 3, 14 is a rotary working machine, which is of a center drive type and includes a rotary transmission case 15 and a rotary recovery cover 16.

The rotary transmission case 15 is composed of a gear case 17 and a transmission case 18, and the transmission case 18 is disposed approximately in the center of a pawl shaft 20 having a large number of tilling pawls 19 around it. The pawl shaft 2 is connected to the input shaft of the heavy duty case 17, and is connected to the pawl shaft 2 via a transmission body built into the transmission case 18.
Drive 0.

The gear case 17 has a top mast 22 connected to the top via a bracket 21, and extends on both sides of the case 17, that is, perpendicular to the work progress direction and parallel to the axial direction of the claw shaft 9. A mounting bracket 24 is fixedly attached to the end of the support arm 23, 23 to constitute a mounting fixture.

The top link 11 is pivotally connected to the top end of the top mast 22, the lower link 12 is pivotally connected to the front side of the mounting brackets 1-24, and the support link 25 is pivotally connected to the other side. The support links 25 support the top mast 22 from both sides.

Further, a support rod 27 is pivotally connected to the middle part of the support arms 23, 23 via a bracket 26.
7 is extended to the rear of the rotary working machine 14, and a gauge wheel 28 is attached to the extended end.

An adjustment rod 29 is interposed between the support rod 27 and the top mast 22, and by adjusting the length of the adjustment rod 29, the vertical position of the support rod 27 can be adjusted with respect to the rotary working machine 14. ing.

The rotary cover 16 includes a rotary main cover 30 that covers the upper part of the claw shaft 20, a side cover 31 that is bolted to both sides of the rotary main cover 30 and covers the sides, and a rotary main cover 30 that swings to the rear of the rotary main cover 30. It consists of a rear cover 32 which is freely pivoted, and the rear cover 32 is connected to the support rod 27.
The rod 33 is pushed downward by a spring.

Accordingly, in the present invention, of the rotary cover 16, particularly the rotary main cover 30 with the side covers 31 is supported by the following means.

The first embodiment will be explained based on FIGS. 3 and 4.
A support 34 having an arch-shaped cross section is fixed to the upper surface of the rotary main cover 30 by welding or the like, and a pair of support pieces 35 and 35 are attached to the upper part of the support 34 at a small distance in the width direction of the cover 30. It is erected at a distance.

The support 34 is attached to the rotary main cover 3 as shown in FIG.
In the width direction (plow width direction) of 0, in this embodiment, the distribution is fixed at a position centering on the rotary transmission case 15, and the longitudinal distribution is fixed at a position. The position of the direction distribution is at support piece 35 in Figure 2.
Examples are F and 35R, respectively.

At this time, the front and rear support pieces 35F and 35R may be separated as shown in the illustrated example, or may be integrated into one support 35 using a metal plate (not shown).

On the other hand, the mounting tools 23, 24, in this embodiment the bracket 24, are mounted by fixing bushes 37, 38 to the inner and outer peripheries of a cylindrical vibration isolator 36 made of rubber, elastic resin, etc., respectively, by baking or the like. Attach the bush 38 to the mounting hole 39 of the bracket 24
It is press-fitted into the

Thus, the mounting bracket 24 is placed between the pair of support pieces 35 and 35.
into the insertion holes 40 opened in the support pieces 35, 35.
Insert a shaft 41, exemplified by a bolt, which is perpendicular to the working direction and parallel to the claw shaft 10 into the inner bushing 37,
A nut 43 is fastened to the shaft 41 from the outside of the support piece 35 via a washer 42.

That is, the mounting tools (support arm 23 and mounting bracket 2
4) and a support 34 are provided on the rotary transmission case 15 and the rotary main cover 30 at positions corresponding to the width direction and front-rear direction of the rotary main cover 30, and a mounting tool (
In this example, a bracket 24) and a support 34 (support piece 35 in this example) are connected via a vibration isolating material 36 fitted around the outer periphery of a shaft 41 that is perpendicular to the work progress direction and parallel to the axial direction of the claw shaft 20. The vibration isolating material 36 supports the rotary main cover 30 with respect to the rotary transmission case 15. In other words, the connection space between the rotary transmission case 15 and the rotary main cover 30 is connected to the vibration isolating material 36. They are connected by only 36.

Next, the second embodiment will be explained based on FIG. 5. The vibration isolating material 36 consists of a pair of divided pieces 44 and 44 divided in the width direction, and is inserted into the mounting hole 39 of the mounting bracket 24. The split piece 44 is integrally provided with a flange 45 that clamps the sides of the bracket 24, and the bushing 46 is inserted only into the cylindrical inner surface of the vibration isolating material 36 formed through both the split pieces 44, 44. ing.

Therefore, the mounting bracket 24 is inserted between the pair of support pieces 35, 35.
2, and the insertion holes 40 opened in the support pieces 35, 35.
A shaft 41 indicated by a bolt is inserted into the bush 46, and a nut 43 is screwed onto the inserted end of the shaft 41.

According to this embodiment, the vibration isolating material 36 is composed of divided pieces 44, 44, and is divided into three pieces having a bushing 46 only on the inner surface.

According to the present invention based on the above-mentioned embodiments, micro vibrations transmitted from the tractor 9 to the rotary transmission case 15 through the three-point linkage structure or the PTO shaft 10, or micro vibrations of the rotary transmission case 15 itself caused by the gear case 17. is relaxed and absorbed by the vibration isolating material 36 and is not transmitted from the mounting bracket 24 to the support piece 35.

Therefore, as in the conventional case, the transmitted vibrations reach the rotary main cover 30 and become noise, and the large vibrations generated during soil crushing are also mitigated and absorbed by the vibration isolating material 36, and the fine vibrations and dog vibrations are combined. not amplified,
It can significantly contribute to noise reduction compared to conventional products.

In particular, it is undesirable for the rotary main cover 30 to vibrate in the front-rear and up-down directions, and the rotary main cover 30 is attached to the mounting tool (in this example, the bracket 24 is mounted) and the support tool 34 are moved in the width direction and the front-rear direction depending on the position of the rotary transmission. A vibration isolator 36 is fixed to the case 15 and the rotary main cover 30 and is fitted around a shaft 41 that is perpendicular to the work progress direction and parallel to the axial direction of the claw shaft 20.
Since the main cover 30 was elastically supported against the low-rise transmission case 15, vibrations in the longitudinal and vertical directions (micro vibrations and dog vibrations) were suitably absorbed. is perpendicular to the working direction and parallel to the axial direction of the pawl shaft 20, so that the shaft 41 will not be twisted due to work impact (e.g. driving reaction force), and the rotary main cover will effectively act as a vibration damper. This also prevents the deformation of 30.

Further, since the noise generated from the rotary main cover 30 is reduced in this way, the cover 30 itself can be formed of an extremely thin metal plate within a range that can withstand soil crushing, and the weight of the rotary work machine 14 is reduced. You can expect.

Furthermore, since the vibration isolating material 36 is highly elastic, even if there is an error in the mounting dimensions between the mounting bracket 24 on the rotary case side and the support piece 35 on the rotary cover side, the vibration isolating material 36 will compensate for this error. This allows suitable attachment of the rotary main cover 30.

Note that the mounting bracket 24 and the support piece 35 are in opposite positions to those in the above embodiment, for example, the support piece 35 is fixed to the support arm 23 side, and the mounting bracket 2 is fixed to the main cover 30 side.
You are free to fix 4.

In the present invention, the rotary transmission case 15 is constructed so that the rotary clutch main cover 30 only has a vibration isolating material 36 fitted around the outer periphery of the shaft 41 which is parallel to the axial direction of the pawl shaft 20 in the width direction perpendicular to the work progress direction.
Moreover, since the vibration isolating material 36 connects the fixtures 23 and 24 and the support 34 provided at the positions of the rotary main cover 30 in the width direction and the longitudinal direction, The vibration isolating material 36 inserted between the shaft 41 and the fixture 24 has the effect of absorbing all vibration shocks against rocking or vibration in the longitudinal direction and the vertical direction.

That is, as the pawl shaft 20 moves forward during plowing work, that is, as the pawl shaft 20 rotates, the rotary transmission case 15 and the rotary main cover 30 relatively move forward and backward, causing rocking or slight vibrations. However, the transmission of the slight vibration from the mounting bracket 24 to the rotary main cover 30 is preferably prevented by the vibration isolating material 36 fitted around the shaft 41 which is perpendicular to this direction of movement and parallel to the axial direction of the claw shaft 20. be done.

Also, during work, crushed soil scattered by the claw shaft 2o hits the rotary main cover 30, causing severe vertical vibrations, but in this case too, the vibration isolating material 36 absorbs the vibrations favorably. It is possible to reliably prevent the impact from being transmitted from the rotary main cover 30 to the rotary transmission case 15 and amplified. At this time, since the shaft 41 is parallel to the axial direction of the claw shaft 2o, it The shaft 41 does not impair the vibration absorption function of the vibration isolating material 36 of the mantle, and the shaft 41 is not twisted, greatly improving durability. ing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional rotary cover mounting structure, Fig. 2 is a side view showing an embodiment of the present invention, Fig. 3 is a longitudinal sectional view showing the first embodiment of the invention, and Fig. 4 is a sectional view showing a rotary cover mounting structure according to a conventional example. FIG. 5 is an enlarged sectional view showing the main parts of the second embodiment. 15...Rotary transmission case, 2o...Claw shaft, 23
...Support arm (mounting tool), 24...Mounting bracket (mounting tool), 30...Rotary main cover, 34
... Supporting tool, 35... Support piece, 36... Vibration isolating material,
41... Axis.

Claims (1)

[Scope of utility model registration request] A rotary main cover that covers the upper part of the pawl shaft is supported by a rotary transmission case via a fixture and a support in which vibration isolating material is interposed between each other, and the pawl shaft is driven by a center drive method. , the mounting tool and the support tool are provided on the rotary transmission case and the rotary main cover at positions that are disposed in the width direction and longitudinal direction of the rotary main cover; A center-drive type rotary crane, characterized in that the rotary main cover is connected to the outer periphery of a shaft parallel to the axial direction of the rotary transmission case only through a vibration isolating material fitted around the outer periphery of the shaft, and the rotary main cover is supported by the vibration isolating material with respect to the rotary transmission case. work equipment.