JP2008022780A - Support structure of tilling shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the support structure of tilling shaft, having a simple structure, which effectively prevents invasion of dust such as soil, etc., on the installation space of a bearing member and an oil seal member for supporting a tilling shaft in fluid-tight. <P>SOLUTION: The support structure 100 of the tilling shaft 110 equipped with a tilling final shaft 111 having a shaft main body 111a and a connection flange 111b and a tilling tine shaft 112 is equipped with a first dust cover 130 for screening the installation space P of the bearing member 410 and the oil seal member 420 from outside and a second dust cover 140 for screening the first dust cover 130 from the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a support structure for a tillage shaft applied to a tractor.

  The tilling shaft includes a shaft main body rotatably supported around a shaft line and a fluid tightly supported by a hollow holder mounted in an opening formed in a support member such as a chain case or a side frame via a bearing member and an oil seal member. A tilling final shaft having a connecting flange provided inward in the vehicle width direction of the main body, and a tilling claw shaft connected to the tilling final shaft through the connecting flange so as not to rotate relative to the tilling final shaft.

By the way, in the support structure of the tilling shaft having such a configuration, it has been proposed to prevent dust such as soil from entering the installation space of the bearing member and the oil seal member (see Patent Document 1 below).
Specifically, the support structure described in the patent document is a hinge plate in which a base end portion is fixed to an inner end face in the vehicle width direction of the connection flange, and a tip end portion is connected to a side plate of the tillage cover, A dust cover is provided close to a hinge plate that is externally inserted into the hollow holder, and the dust cover is configured to prevent dust and the like from entering the installation space.

However, the conventional support structure is merely provided with a single dust cover, and cannot sufficiently prevent dust from entering the installation space, and is disposed in the installation space. There was a problem that the durability of the oil seal member and the bearing member deteriorated.
Japanese Utility Model Publication No. 57-149705

  The present invention has been made in view of the prior art, and can effectively prevent dust such as soil from entering the installation space of the bearing member and the oil seal member for supporting the tilling shaft in a liquid-tight manner. An object is to provide a support structure for a tilling shaft with a simple structure.

  In order to achieve the above object, the present invention provides a shaft body that is rotatably and liquid-tightly supported around a shaft line via a bearing member and an oil seal member installed in a bearing portion of the support member, and a vehicle width of the shaft body A tilling shaft support structure comprising a tilling final shaft having a connecting flange provided inward in the direction and a tilling claw shaft that is connected to the tilling final shaft through the connecting flange so as not to rotate relative to the tilling axis. A first dust cover that cooperates with the side plate of the tillage cover or the tillage cover side member connected to the side plate and the connecting flange to shut off the installation space of the bearing member and the oil seal member from the outside; A second dust cover for shutting off the first dust cover from the outside in cooperation with the side plate or the tilling cover side member and the connecting flange; Providing a support structure for that cultivating shaft.

Specific examples of the support structure for the tillage shaft according to the present invention include the following. That is,
(A) A mode in which the second dust cover is attachable to and detachable from the side plate or the tillage cover side member and the connecting flange,
(B) In the first dust cover, the base end portion is fixed to the connection flange and the tip end portion cooperates with a groove provided in the tillage cover side member so that the bearing member and the oil seal member are installed. Forming a first intrusion prevention portion for preventing intrusion of dust from outside into the space, and the second dust cover has a vehicle width direction outer end portion on a side of the tillage cover at a radially outer side than the first dust cover. The tillage so as to form a second intrusion prevention portion that cooperates with a member and has an inner end side in the vehicle width direction cooperates with the connecting flange to prevent intrusion of dust from the outside into the first intrusion prevention portion. A mode that is detachably connected to the cover side member,
(C) the second dust cover is formed by a plurality of dust cover forming bodies,
(D) the second dust cover is formed of a non-metallic material,
(E) a mode in which a space exists between the first dust cover and the second dust cover;
(F) An embodiment including at least one of the embodiments (a) to (e).

In the aspect (c), it is preferable that the plurality of dust cover forming bodies are in a connected state. In this case, both end portions of the plurality of dust cover forming bodies that are in the connected state may be configured to engage with each other.
In the aspect (c), it is preferable that the dust cover forming body positioned at the lowermost position among the plurality of dust cover forming bodies is thicker than the other dust cover forming bodies.
In the embodiment (d), the non-metallic material is preferably a material made of an elastic body.
In the aspect of (e), dust such as soil that enters beyond the second dust cover enters the space existing between the first dust cover and the second dust cover. It is preferable that a baffle member for preventing reaching the cover is provided. In this case, examples of the baffle member include a plurality of spheres and a ring-shaped member formed so as to be inserted into the space. Examples of the material that can be used for the baffle member include a plastic material.

According to the support structure of the tillage shaft according to the present invention, the bearing member and the oil seal member are installed in cooperation with the side plate of the tillage cover or the tillage cover side member connected to the side plate and the connecting flange. In addition to the first dust cover for blocking the space from the outside, the second dust cover for blocking the first dust cover from the outside in cooperation with the side plate or the tillage cover side member and the connecting flange. Therefore, even if dust such as soil enters beyond the second dust cover, in order to enter the installation space, it is necessary to further enter beyond the first dust cover, Accordingly, the dust can be made difficult to enter the installation space.
Accordingly, it is possible to effectively prevent dust such as soil from entering the installation space of the bearing member and the oil seal member for supporting the tilling shaft in a liquid-tight manner.

In addition, when the second dust cover is detachable from the side plate or the tilling cover side member and the connecting flange, even if dust enters beyond the second dust cover, By removing the second dust cover from the side plate or the tillage cover side member and the connecting flange, it is possible to easily clean the dust that has entered the second dust cover with the second dust cover removed. Accordingly, it is possible to effectively prevent dust from entering the installation space.
In this case, when the second dust cover is formed of a plurality of dust cover forming bodies, the second dust cover can be easily attached to and detached from the side plate or the tilling cover side member and the connecting flange. Further, when the dust cover forming body located at the lowermost position among the plurality of dust cover forming bodies is thicker than the other dust cover forming bodies, the dust cover forming body positioned at the lowermost position is used. The durability of can be improved.

  In addition, when the second dust cover is formed of a non-metallic material, the second dust cover is formed of a non-metallic material, so that other component parts (for example, the rotating connection part) Even if it comes into contact with the flange), it is possible to effectively prevent the occurrence of problems such as noise due to contact with the other components.

In addition, when a space exists between the first dust cover and the second dust cover, even if dust enters the space between the first dust cover and the second dust cover. However, the space acts as a space for storing the dust that has entered, can delay the entry of the dust into the installation space, and more effectively prevent the dust from entering the installation space. Can do.
In this case, when the baffle member is disposed in the space existing between the first dust cover and the second dust cover, the intrusion of dust into the space is prevented. In addition to being able to be effectively blocked by the member, even if dust enters the space, the penetration of the dust into the installation space can be further delayed by the baffle member, and accordingly, in the installation space. It is possible to effectively prevent dust from invading.

Hereinafter, preferred embodiments of a support structure for a tillage shaft according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view showing a tractor A to which an embodiment 100 of a support structure for a tillage shaft according to the present invention is applied.

A tractor A shown in FIG. 1 includes a tractor main body 200 and a rotary cultivator 300 attached to the tractor main body 200.
In the tractor main body 200, a bonnet 6 is disposed at a front portion of a main body that suspends the front wheel 1 and the rear wheel 2 forward and backward, and a drive source (here, an engine) 5 is disposed inside the bonnet 6. . A steering handle 10 is disposed in front of the driver's seat 11.

A mission case 50 is disposed behind the drive source 5, and the power from the drive source 5 is transmitted to the mission case 50 to change the speed, and the drive force is transmitted to the rear wheel 2 and the front wheel 1. It is configured.
The rotary cultivator 300 is mounted on a work machine mounting device 220 provided at the rear of the tractor main unit 200 via a coupling mechanism 210 provided in the device 220.
The work implement mounting device 220 includes a top link 221 and a pair of left and right lower links 222. The lower link 222 is connected via a lift rod 224 to a lift arm 223 provided on a side in the vehicle width direction of a hydraulic case 51 disposed on the transmission case 50.
The rotary tiller 300 can be turned up and down via the lift rod 224 and the lower link 222 when the lift arm 223 is turned up and down by expansion and contraction of a hydraulic cylinder (not shown) in the hydraulic case 51. ing.

  The rotary tiller 300 is driven by a part of the power from the drive source 5 being transmitted to the rotary tiller 300 via the universal joint 16 from the PTO shaft 15 protruding from the rear surface of the transmission case 50. It is configured.

FIG. 2 is a developed sectional view of the power transmission structure of the rotary tiller 300 shown in FIG.
As shown in FIGS. 1 and 2, the rotary tiller 300 includes an input shaft 310, a power transmission shaft 320, a rotor case 330, a tilling unit 340, and a tilling cover 150 that covers the tilling unit 340. ing.
The input shaft 310 is configured to be operatively connected to the PTO shaft 15 provided in the apparatus via the universal joint 16, and the power from the drive source 5 is transmitted to the PTO shaft 15 and the universal joint. 16 is transmitted.

  The power transmission shaft 320 is configured such that power from the input shaft 310 is transmitted by the first transmission mechanism 350, and is operatively connected to the input shaft 310 via the first transmission mechanism 350. .

Specifically, the first transmission mechanism 350 includes a bevel gear box 351 and first and second bevel gears 352 and 353.
The bevel gear box 351 supports the input shaft 310 so as to be rotatable about an axis, and also supports one end side of the power transmission shaft 320 disposed so as to be orthogonal to the input shaft 310 so as to be rotatable about the axis. is doing.
The first bevel gear 352 is accommodated in the bevel gear box 351 and is externally fixed to the input shaft 310. The second bevel gear 353 is accommodated in the bevel gear box 351 and is externally fitted and fixed to one end side of the power transmission shaft 320 so as to mesh with the first bevel gear 352.

  The rotor case 330 is disposed at the outer ends of the pair of left and right main beams 331 and 332 provided on both sides of the transmission mechanism 350 in the vehicle width direction and the pair of left and right main beams 331 and 332, respectively. The supporting members 333 and 334 are provided.

Specifically, the support member 333 disposed on the one main beam 331 is a chain case here, and the support member 334 disposed on the other main beam 332 is a side frame here. It is said that.
The one main beam 331 is disposed so as to connect one side surface of the bevel gear box 351 and the upper end portion of the chain case 333, and the power transmission shaft 320 is internally provided. The other main beam 332 is disposed so as to connect the other side surface of the bevel gear box 351 and the upper end portion of the side frame 334.

The chain case 333 has an upper end that rotatably supports the other end of the power transmission shaft 320 around its axis, and a bearing portion 101 at the lower end is one end of the tillage shaft 110 that constitutes the tillage portion 340. The side is supported through a bearing member 410 and an oil seal 420 so as to be rotatable about the axis and liquid-tight.
Here, the oil seal 420 is for preventing leakage of the lubricating oil in the chain case 333.
Further, in the side frame 334, a bearing portion at a lower end portion supports the other end portion of the tillage shaft 110 so as to be rotatable about an axis.

The tilling part 340 includes a tilling shaft 110 and a tilling claw 120.
The tillage shaft 110 is configured such that the power from the power transmission shaft 320 is transmitted by the second transmission mechanism 360, and is operatively connected to the power transmission shaft 320 via the second transmission mechanism 360. Yes.

Specifically, the second transmission mechanism 360 includes first and second sprockets 361 and 362 and a chain 363.
The first sprocket 361 is externally fitted and fixed to the other end of the power transmission shaft 320, and the second sprocket 362 is externally fixed to the one end of the tillage shaft 110. The chain 363 is wound around the first and second sprockets 361 and 362.
Further, the tilling claw 120 is provided on a tilling claw shaft 112, which will be described later, constituting the tilling shaft 110 so as not to rotate relative to the axis.

  With this configuration, the rotary cultivator 300 allows the power transmitted from the input shaft 110 to the power transmission shaft 320 via the first transmission mechanism 350 to pass through the second transmission mechanism 360. This is transmitted to the tilling shaft 110, whereby the tilling claw 120 on the tilling shaft 110 is rotationally driven around the axis.

Next, the support structure 100 for the tillage shaft 110 according to the present embodiment will be described in detail with reference to FIG.
FIG. 3 is a cross-sectional view showing a schematic configuration of the support structure 100 of the tillage shaft 110 according to the present embodiment.
The tilling shaft 110 includes a tilling final shaft 111 and a tilling claw shaft 112 as shown in FIG.

The tilling final shaft 111 includes a shaft main body 111a and a connecting flange 111b.
The shaft main body 111a is supported in a fluid-tight manner so as to be rotatable about an axis via the bearing member 410 and the oil seal member 420 installed in the bearing portion 101 of the support member (here, the chain case 333). The connecting flange 111b is provided inward in the vehicle width direction of the shaft main body 111a.
Further, the tilling claw shaft 112 is connected to the tilling final shaft 111 through the connecting flange 111b constituting the tilling final shaft 111 so as not to rotate relative to the tilling final shaft 111.

  The support structure 100 for the tilling shaft 110 includes a first dust cover 130 and a second dust cover 140.

The first dust cover 130 is connected to the side plate 151 of the tillage cover 150 or the tilling cover side member 152 (here, the hinge plate 152 connected to the side plate 151) connected to the side plate 151 and the connecting flange 111b. It is configured to block the installation space P of the bearing member 410 and the oil seal member 420 from the outside.
The second dust cover 140 cooperates with the side plate 151 or the tilling cover side member 152 (here, the hinge plate 152 connected to the side plate 151) and the connection flange 111b, so that the first dust cover 130 is provided. Is configured to be shielded from the outside.

According to the support structure 100 of the tillage shaft 110 according to the present embodiment, since the second dust cover 140 is provided in addition to the first dust cover 130, dust such as soil may be in the second dust cover. Even if it exceeds 140, in order to enter the installation space P, it must enter further beyond the first dust cover 130, and the dust is less likely to enter the installation space P. can do.
Accordingly, it is possible to effectively prevent dust and the like from entering the installation space P of the bearing member 410 and the oil seal member 420 for supporting the tilling shaft 110 in a liquid-tight manner. It is possible to effectively prevent deterioration of the durability of the oil seal member 410 and the bearing member 420, and consequently damage to the bearing member 410 and / or the oil seal member 420.

In the present embodiment, as shown in FIG. 4, the second dust cover 140 is detachable from the hinge plate 152 and the connecting flange 111b.
4 is a side view showing the second dust cover 140 in the support structure 100 shown in FIG. 3, and FIG. 4 (a) shows a state in which the second dust cover 140 is open. (B) shows a state in which the second dust cover 140 is closed.
By providing such a configuration, the support structure 100 of the tillage shaft 110 allows the second dust cover 140 to be connected to the hinge plate 152 and the connecting flange even if dust enters beyond the second dust cover 140. By removing from 111b, it is possible to easily clean the dust that has entered beyond the second dust cover 140 in a state in which the second dust cover 140 is removed, and accordingly, the dust enters the installation space P. This can be effectively prevented.

  In the present embodiment, the second dust cover 140 is formed by a plurality of dust cover forming bodies (here, two dust cover forming bodies 140a and 140b) as shown in FIG. By doing so, it is possible to easily attach and detach the hinge plate 152 and the connecting flange.

In the present embodiment, the plurality of dust cover forming bodies 140a and 140b are connected. By doing so, it is possible to make the hinge plate 152 and the connecting flange easier to attach and detach.
Specifically, the second dust cover 140 is opened at one end of one of the two dust cover forming bodies 140a and 140b so as to open around an axis along the axial direction of the tilling shaft 110. 140a ′ and one end 140b ′ of the other dust cover forming body 140b are connected via a hinge C.
Then, both end portions 140a "and 140b" of the plurality of dust cover forming bodies 140a and 140b in the connected state are configured to engage with each other in a concave-convex manner. By doing so, the plurality of dust cover forming bodies 140a and 140b can be securely held when closed, and dust can be effectively prevented from entering from the concave and convex engaging portions.
Here, the other end portion 140a "of the one dust cover forming body 140a is concave so that both end portions 140a", 140b "of the two dust cover forming bodies 140a, 140b in the connected state engage with each other. The other end portion 140b ″ of the other dust cover forming body 140b is convex.

In the present embodiment, as shown in FIGS. 5 and 6, the dust cover forming body 140b located at the lowermost position among the plurality of dust cover forming bodies 140a and 140b is thicker than the other dust cover forming bodies 140a. It may be thick.
Thus, when the dust cover forming body 140b positioned at the lowermost position is thicker than the other dust cover forming bodies 140a, the durability of the dust cover forming body 140b positioned at the lowermost position is improved. be able to. For example, even if the dust cover forming body 140b located at the lowermost position is worn out due to wear due to collision with an external object such as soil, it is thicker than the other dust cover forming bodies 140a. It can be used over a long period of time.

In the present embodiment, the second dust cover 140 may be formed of a non-metallic material (here, a material made of an elastic body such as a resin). By doing so, even if the second dust cover 140 comes into contact with another component (for example, the rotating connecting flange 111b), it is possible to effectively generate problems such as noise due to contact with the other component. Can be prevented.
Such a configuration is particularly effective when the other components that come into contact with the second dust cover 140 are formed of a metal material.

In the present embodiment, as shown in FIG. 3, a space Q (here, the first dust cover 130 and the hinge plate 152, between the first dust cover 130 and the second dust cover 140, A space Q) surrounded by the second dust cover 140 and the connecting flange 111b exists.
By providing such a configuration, the support structure 100 of the tillage shaft 110 allows the space Q to act as a storage space for the dust that has entered, even when dust enters the space Q. Intrusion into the installation space P can be delayed, and as a result, it is possible to more effectively prevent dust from entering the installation space P.
In this case, as shown in FIG. 5, soil or the like entering the space Q existing between the first dust cover 130 and the second dust cover 140 beyond the second dust cover 140. A baffle member 160 that prevents dust from reaching the first dust cover 130 may be provided. For example, as shown in the figure, the baffle member 160 may be a plurality of spheres (specifically, spheres made of plastic).
In the support structure 100 having such a configuration, the intrusion of dust into the space Q can be effectively prevented by the baffle member 160, and even if dust enters the space Q, The entry of dust into the installation space P can be further delayed by the baffle member 160, and it is possible to effectively prevent the dust from entering the installation space P.

Next, a more specific description will be given with reference to FIGS.
As shown in FIG. 3, an opening 333 a is provided on the inside of the chain case 333 in the vehicle width direction of the bearing portion 101.
The shaft main body 111a is supported by a hollow holder 430 mounted in the opening 333a formed in the chain case 333 via the bearing member 410 and the oil seal member 420 so as to be rotatable around the axis and in a liquid-tight manner. .
Specifically, the bearing member 410 and the oil seal member 420 are provided between the second sprocket 362 and the connection flange 111b, and the oil seal member 420 is disposed in the vehicle width direction of the bearing member 410. It is arranged in the direction.

FIG. 7 is a perspective view showing the first dust cover 130 and the tilling final shaft 111 provided with the first dust cover 130 in the support structure 100 shown in FIG. 3.
As shown in FIGS. 3 and 7, the first dust cover 130 has a base end portion 131 fixed to the connection flange 111 b and a tip end portion 132 that cooperates with a groove 152 a provided in the hinge plate 152. A first intrusion prevention unit for preventing intrusion of dust from the outside into the installation space P is formed.
More specifically, the first dust cover 130 is fixed to the connecting flange 111b with a connecting means such as welding, for example, with the base end 131 facing the outer end surface of the connecting flange 111b in the vehicle width direction. The base end surface portion is a ring-shaped base end surface portion that is integrally formed), and the front end portion 132 is a cover portion that extends outward in the vehicle width direction from the radially outer end portion of the base end surface portion 131.
The connecting flange 111b has a disk shape as shown in FIG.

As shown in FIG. 3, the hinge plate 152 is detachably connected to the side plate 151 (here, by a fixing member BL <b> 2 such as a bolt) and is extrapolated to the hollow holder 430.
In addition, the hinge plate 152 is close to the first dust cover 130 and supports the second dust cover 140 in a detachable manner.

Specifically, the hinge plate 152 is arranged on the inner side in the vehicle width direction so that the free end portion 132a of the cover portion 132 of the first dust cover 130 can be inserted at a predetermined interval. It has an insertion groove 152a that extends circumferentially around the axis and outward in the vehicle width direction, and is provided with a connecting portion 152b that is connected to the side plate 151.
A protruding portion 152c extending inward in the vehicle width direction along the free end portion 132a of the cover portion 132 is provided on the radially outer peripheral portion of the insertion groove 152a.

In the second dust cover 140, the outer end 141a in the vehicle width direction cooperates with the hinge plate 152 and the inner end side in the vehicle width direction cooperates with the connecting flange 111b on the outer side in the radial direction than the first dust cover 130. The hinge plate 152 is detachably connected so as to form a second intrusion prevention portion for preventing dust from entering the first intrusion prevention portion from the outside.
More specifically, the second dust cover 140 has a connecting portion 143 connected to the side plate 151 or the tilling cover side member 152 (here, the hinge plate 152 connected to the side plate 151). The outer end portion 141a in the vehicle width direction is fitted to the fitting portion (here, the fitting groove 152d) of the hinge plate 152 at the outer side in the radial direction from the first dust cover 130.
The second dust cover 140 is opposed so that the radially inner peripheral surface 142a on the inner end side in the vehicle width direction is close to the outer peripheral surface 111b ′ of the connecting flange 111b.

Here, as shown in FIG. 8, the second dust cover 140 has a radially inner peripheral surface 141 b of the outer end portion 141 a in the vehicle width direction at the outer side in the radial direction from the first dust cover 130. You may be comprised so that it may contact | abut to radial direction outer surface 152e (For example, radial direction outer surface 152e in the said protrusion part 152c).
Further, as shown in FIG. 8, the second dust cover 140 may face the outer surface 142b on the inner end side in the vehicle width direction so as to be close to the outer end surface 111b ″ in the vehicle width direction of the connecting flange 111b. Good.

Further, as shown in FIG. 9, the second dust cover 140 is connected to the side plate 151 or the tilling cover side member 152 (here, the hinge plate 152 connected to the side plate 151) and the connection flange 111b. It may be relatively rotatable around the axis of the tilling shaft 110.
Specifically, in the second dust cover 140, a sliding portion 141 c on the outer end side in the vehicle width direction is slidable in a sliding groove 152 f described later of the hinge plate 152 on the outer side in the radial direction from the first dust cover 130. And a radial inner peripheral surface 142c on the inner end side in the vehicle width direction may be a cylindrical member configured to face the outer peripheral surface 111b 'of the connecting flange 111b.

In this case, the hinge plate 152 has a circumference around the axis so that the sliding portion 141c of the second dust cover 140 can slide around the axis of the tilling shaft 110 on the inner side in the vehicle width direction. A sliding groove 152f extending inward and radially inward can be provided.
In the support structure 100 having such a configuration, the second dust cover 140 itself can be freely rotated, so that an impact with an external object such as soil can be reduced. Can be effectively avoided, and the winding of wrinkles and the like can be effectively prevented.
In addition, since the second dust cover 140 itself is rotatable, wear due to collision with an external object such as soil is not only a part of the circumferential direction of the second dust cover 140 but also the entire circumference. It can be made to proceed evenly, whereby the durability of the second dust cover 140 can be improved.
Preferably, the connecting flange 111b may be provided with a stopper member 144 for preventing the second dust cover 140 from moving inward in the vehicle width direction.

  In addition, although the support structure 100 of the tilling shaft 110 according to the present embodiment is configured to be applied to the chain case 333 side that acts as the support member, the support structure 100 to the side frame 334 side that acts as the support member. It may be configured to be applied.

FIG. 1 is a side view showing a tractor to which an embodiment of a support structure for a tillage shaft according to the present invention is applied. FIG. 2 is a developed sectional view of the power transmission structure of the rotary tiller shown in FIG. FIG. 3 is a cross-sectional view illustrating a schematic configuration of a support structure for a tilling shaft according to the present embodiment. 4 is a side view showing a second dust cover in the support structure shown in FIG. 3, and FIG. 4 (a) shows a state in which the second dust cover is open, and FIG. 4 (b). Indicates a state in which the second dust cover is closed. FIG. 5 is a cross-sectional view showing another example of the support structure shown in FIG. FIG. 6 is a side view showing a second dust cover in another example of the support structure shown in FIG. 3. FIG. 7 is a perspective view showing a first dust cover and a tilling final shaft provided with the first dust cover in the support structure shown in FIG. 3. FIG. 8 is a cross-sectional view showing still another example of the support structure shown in FIG. FIG. 9 is a cross-sectional view showing still another example of the support structure shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Support structure of tilling shaft 101 ... Bearing part 110 ... Tilling shaft
111 ... Tilling final shaft 111a ... Shaft body 111b ... Connection flange
112 ... Tilling claw shaft 130 ... first dust cover 131 ... base end of the first dust cover
132 ... First end of first dust cover 140 ... Second dust cover
141a ... Vehicle width direction outer end of second dust cover 150 ... Tillage cover
151 ... Side plate of tillage cover 152 ... Tillage cover side member
152a ... groove provided in the hinge plate 160 ... baffle member 333 ... support member
410: Bearing member 420 ... Oil seal member P: Installation space
Q: Space existing between the first dust cover and the second dust cover

Claims (9)

A tiller having a shaft body that is rotatably and liquid-tightly supported around a shaft line via a bearing member and an oil seal member that are installed in a bearing portion of the support member, and a connecting flange that is provided inward in the vehicle width direction of the shaft body. A tilling shaft support structure comprising a final shaft and a tilling claw shaft that is connected to the tilling final shaft through the connecting flange so as not to rotate relative to the tilling axis.
A first dust cover that blocks the installation space of the bearing member and the oil seal member from the outside in cooperation with the side plate of the tillage cover or the tillage cover side member connected to the side plate and the connecting flange;
A support structure for a tilling shaft, comprising: a second dust cover that cooperates with the side plate or the tilling cover side member and the connecting flange to shield the first dust cover from the outside.   The tiller shaft support structure according to claim 1, wherein the second dust cover is detachable from the side plate or the tillage cover side member and the connection flange. The first dust cover has a base end portion fixed to the connection flange and a tip end portion that cooperates with a groove provided in the tillage cover side member, to the installation space of the bearing member and the oil seal member. Forming a first intrusion prevention portion for preventing dust from entering from the outside;
In the second dust cover, the outer end portion in the vehicle width direction cooperates with the tillage cover side member and the inner end side in the vehicle width direction cooperates with the connecting flange, radially outward from the first dust cover, The cultivating cover side member is detachably connected so as to form a second intrusion preventing portion for preventing dust from entering the first intrusion preventing portion from the outside. The support structure of the tilling shaft as described in 2.   The tiller shaft support structure according to any one of claims 1 to 3, wherein the second dust cover is formed by a plurality of dust cover forming bodies.   The tiller shaft support structure according to claim 4, wherein a dust cover forming body positioned at a lowermost position among the plurality of dust cover forming bodies is thicker than other dust cover forming bodies. .   The tiller shaft support structure according to any one of claims 1 to 5, wherein the second dust cover is formed of a non-metallic material.   The tilling shaft support structure according to any one of claims 1 to 6, wherein a space exists between the first dust cover and the second dust cover.   The baffle member which prevents dust, such as dirt which penetrates beyond the 2nd dust cover, from reaching the 1st dust cover, is arranged in the space. Support structure for tillage shaft.   The tiller shaft support structure according to claim 8, wherein the baffle members are a plurality of spheres.

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