JP2008054528A - Supporting structure of tilling rotary shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting structure of a tilling rotary shaft having simple structure and effectively preventing the intrusion of dust such as soil in an installation space of a bearing member and sealing member supporting the tilling rotary shaft. <P>SOLUTION: The supporting structures 100a, 100b, 100c of a tilling rotary shaft 110 provided with a tilling final shaft 111 having a shaft body 111a and a connection flange 111b and a tilling tine shaft 112 is furnished with dust covers 130a, 130b, 130c, 130c' placed on the connection flange 111b to form a first labyrinth structure Q1. The dust covers 130a, 130b, 130c, 130c' have a main body 131 forming the first labyrinth structure Q1 and one or more foreign material rejecting parts 132 protruding radially outward from the outer circumference of the main body 131. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

The tillage shaft is supported by a hollow holder attached to an opening formed in a support member such as a chain case or a side frame, and is supported rotatably and liquid-tightly around the axis via a bearing member and a seal member. A tilling final shaft having a connecting flange provided inward in the vehicle width direction, and a tilling claw shaft connected to the tilling final shaft via 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 and the like from entering the installation space of the bearing member and the 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 outer surface 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 has a structure with a simple construction that can effectively prevent dust and the like from entering the installation space of the bearing member and the seal member that support the tilling shaft. One object is to provide a support structure.

  In order to achieve the above-mentioned object, the present invention provides a shaft body that is rotatable and liquid-tightly supported around a shaft line via a bearing member and an oil seal member installed in the bearing portion of the support member, and a vehicle width direction of the shaft body. A tilling shaft support structure comprising a tilling final shaft having a connecting flange provided inward and a tilling claw shaft connected to the tilling final shaft through the connecting flange so as not to rotate relative to the tilling shaft. The dust cover provided on the coupling flange so as to form a first labyrinth structure that cooperates with the fixed side member to prevent dust from entering the installation space of the bearing member and the oil seal member from the outside. And the dust cover includes a main body part forming the first labyrinth structure, and one or a plurality of foreign matter exclusion parts protruding radially outward from an outer peripheral surface of the main body part. To have to provide a supporting structure of a tiller axis, wherein.

  As a specific aspect of the foreign matter exclusion portion, (a) the foreign matter exclusion portion is formed by one or more rod-like members and / or one or more plate-like members provided on a part of the outer peripheral surface of the main body portion. (B) The foreign matter exclusion portion is provided over the entire outer peripheral surface of the main body portion so as to overlap the first labyrinth structure when viewed along the axial direction of the tilling shaft. The aspect currently formed with the made flange member can be illustrated.

In the case of the mode (a), the rod-like member and the plate-like member are provided in the main body portion so as to overlap the first labyrinth structure when viewed along the axial direction of the tilling shaft. May be.
In the case of the mode (b), the following specific modes (b1) to (b3) can be exemplified. That is,
(B1) The surface of the flange member that faces inward in the vehicle width direction is provided with a tapered surface that is located at the inner side in the vehicle width direction from the radially inner side to the outer side in at least a part of the circumferential direction. The embodiment,
(B2) The flange member cooperates with the fixed-side member to form a second labyrinth structure that prevents dust from entering the first labyrinth structure,
(B3) A mode in which (b1) and (b2) are combined.

In the aspect including (b2), the surface of the flange member facing outward in the vehicle width direction cooperates with the stationary member to prevent dust from entering the first labyrinth structure from the outside. An example of forming the second labyrinth structure is illustrated.
For example, an uneven portion may be provided on the surface of the flange member facing outward in the vehicle width direction, and an uneven portion may be provided on the surface of the fixed member facing inward in the vehicle width direction. May be. An uneven portion may be provided on the surface of the flange member facing outward in the vehicle width direction, and an uneven portion may be provided on the surface of the fixed side member facing inward in the vehicle width direction.
Or the recessed part is provided in one of the opposing surfaces of the said flange member and the said fixed side member, and the convex part corresponding to the said recessed part may be provided in the other.

In the support structure for the tillage shaft according to the present invention, the foreign matter exclusion portion may be a cutting blade.
Moreover, in the support structure for a tillage shaft according to the present invention, the foreign matter exclusion portion is configured to completely cover the outer peripheral surface of the main body portion so as to overlap the first labyrinth structure when viewed along the axial direction of the tillage shaft. You may provide the flange part provided over the periphery and the cutting blade provided in the outer periphery of the said flange part.
Specific examples of the cutting blade include the following. That is,
(C1) The cutting blade has a tapered surface whose thickness decreases as it goes in the forward rotation direction of the connecting flange,
(C2) The cutting blade has a tapered surface whose thickness decreases as it goes in the reverse direction of the connecting flange,
(C3) A mode in which the modes (c1) and (c2) are combined.

According to the tillage shaft support structure according to the present invention, the first labyrinth structure that cooperates with the fixed-side member to prevent dust from entering the installation space of the bearing member and the oil seal member from the outside. A dust cover provided on the coupling flange to form a main body part that forms the first labyrinth structure, and a dust cover that protrudes radially outward from an outer peripheral surface of the main body part, or Since it has a plurality of foreign matter exclusion portions, the foreign matter exclusion portion can effectively remove dust such as dirt and soot that tends to enter the first labyrinth structure.
Accordingly, it is possible to effectively prevent dirt and other dust from entering the installation space of the bearing member and the oil seal member that supports the tilling shaft, and the durability of the bearing member and the oil seal member is deteriorated. Damage to the bearing member and / or the oil seal member can be effectively prevented.

  Further, when the foreign matter exclusion portion is formed by the rod-like member and / or plate-like member provided on a part of the outer peripheral surface of the main body, the rotation accompanying the rotation of the tillage shaft around the axis line is performed. By rotating the rod-like member and / or the plate-like member, the dust that tries to enter the first labyrinth structure can be removed, whereby the dust can be effectively eliminated.

In addition, the foreign matter removing portion is formed by the flange member provided over the entire outer peripheral surface of the main body portion so as to overlap the first labyrinth structure when viewed along the axial direction of the tilling shaft. When formed, the flange member can prevent the dust from entering the first labyrinth structure, thereby effectively removing the dust.
In addition, a taper surface is provided on a surface of the flange member facing inward in the vehicle width direction so as to be positioned inward in the vehicle width direction from the radially inner side to the outer side in at least a part of the circumferential direction. In the case where the flange member rotates, the taper surface rotation accompanying the rotation of the flange member can remove dust that tries to enter the first labyrinth structure, thereby further effectively removing the dust. Can do.

In addition, when the flange member cooperates with the fixed-side member to form the second labyrinth structure, the second labyrinth structure effectively prevents dust from entering the first labyrinth structure. As a result, it is possible to more effectively prevent dust from entering the installation space.
Further, when an uneven portion is provided on the surface of the flange member facing outward in the vehicle width direction and / or the surface of the fixed side member facing inward of the vehicle width direction, the uneven portion causes the first It is possible to effectively prevent dust from entering the labyrinth structure, and even if dust enters the uneven portion, the dust in the uneven portion is pushed out by rotation of the flange member accompanying rotation of the tillage shaft. Can do.

  In addition, when the foreign matter exclusion portion is the cutting blade and when the foreign matter exclusion portion is provided with the flange portion and the cutting blade, the cutting blade winds dust such as grass and straw. As a result, it is possible to more effectively eliminate dust that tends to enter the first labyrinth structure.

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 the tilling shaft support structures 100a, 100b, and 100c according to the first to third embodiments of the present invention are 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 structures 100a, 100b, and 100c of the tillage shaft 110 according to the first to third embodiments of the present invention will be described in detail.
FIG. 3 is a sectional view showing a schematic configuration of the support structure 100a, 100b of the tillage shaft 110 according to the first and second embodiments, and FIG. 4 is a support structure of the tillage shaft 110 according to the third embodiment. It is sectional drawing which shows schematic structure of 100c.
3 and 4, members having substantially the same configuration and action are denoted by the same reference numerals. The same applies to FIG. 10 described later.

  The tilling shaft 110 includes a tilling final shaft 111 and a tilling claw shaft 112 as shown in FIGS. 3 and 4.

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 structures 100a, 100b, and 100c of the tillage shaft 110 include dust covers 130a, 130b, and 130c.
As shown in FIGS. 3 and 4, the dust covers 130a, 130b, and 130c are side plates 151 of the tillage cover 150, which is an example of a fixed side member, or a tillage cover side member connected to the side plate 151 (here, A first labyrinth structure Q1 that prevents dust from entering the installation space P of the bearing member 410 and the oil seal member 420 is formed in cooperation with the hinge plate 152) connected to the side plate 151. As described above, the connecting flange 111 is provided.
The dust covers 130a, 130b, and 130c include a main body 131 that forms the first labyrinth structure Q1, and one or more foreign matter exclusion portions that protrude radially outward from the outer peripheral surface 131a of the main body 131. 132.

According to the support structures 100a, 100b, and 100c of the tillage shaft 110 of the first to third embodiments, the connecting flange 111 cooperates with the fixed side member 152 to form the first labyrinth structure Q1. The dust covers 130a, 130b, and 130c are provided on the main body 131, and the dust covers 130a, 130b, and 130c are protruded radially outward from the outer peripheral surface 131a of the main body 131. Since the plurality of foreign matter exclusion portions 132 are provided, the foreign matter exclusion portion 132 can effectively exclude dust such as dirt and soot that tends to enter the first labyrinth structure Q1.
Accordingly, it is possible to effectively prevent dust such as soil from entering the installation space P of the bearing member 410 and the oil seal member 420 that support the tilling shaft 110 in a liquid-tight manner, and the oil seal It is possible to effectively prevent deterioration of the durability of the member 410 and the bearing member 420, and hence damage to the bearing member 410 and / or the oil seal member 420.

Further, the support structures 100a, 100b, and 100c according to the first to third embodiments will be described in detail. An opening 333a is provided in the chain case 333 on the inner side 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.

The main body 131 has a hook shape that is open on the outer side in the vehicle width direction, and the outer side in the vehicle width direction that is open is the side plate 151 of the tillage cover 150 or the tillage cover side member (here, The first labyrinth structure Q1 is formed in cooperation with the hinge plate 152).
Specifically, the side plate 151 of the tillage cover 150 or the tillage cover side member (here, the hinge plate 152) includes a plate portion 152a extending substantially in the vertical direction and an inward in the vehicle width direction from the plate portion 152. And a protruding boss portion 152b.
The outer peripheral surface 131a ′ on the outer side in the vehicle width direction of the main body 131 is as close as possible to the inner peripheral surface 152b ′ of the boss portion 152b, and the outer peripheral surface 131a ′ on the outer side in the vehicle width direction. The first labyrinth structure Q1 is formed by the inner peripheral surface 152b ′.

Preferably, the end surface (end surface facing outward in the vehicle width direction) 131b of the main body portion 131 in the vehicle width direction is a surface in which the side plate 151 or the tillage cover side member faces in the vehicle width direction (here, The first labyrinth structure Q1 is formed as close as possible to the surface 152c of the hinge plate 152 facing the end surface 131b of the main body 131.
More preferably, a recess 152d is formed on a surface of the side plate 151 or the tilling cover side member facing inward in the vehicle width direction (here, a surface 152c facing the end surface 131b of the main body 131 of the hinge plate 152). In addition, the first labyrinth structure Q1 can be formed by positioning the vehicle width direction outer end side of the main body 131 in the recess 152d.
Here, the dust covers 130 a, 130 b, and 130 c are fixedly attached to the connecting flange 111 b in which the main body 131 forms the tilling final shaft 111. Here, the hinge plate 152 is externally attached to the hollow holder 430, and the side plate 151 is detachably connected (for example, by a fixing member BL such as a bolt).

(Support structure 100a of 1st Embodiment)
FIG. 5 is a perspective view showing the dust cover 130a and the tilling final shaft 111 provided with the dust cover 130a in the support structure 100a of the first embodiment.
In the support structure 100a of the first embodiment, as shown in FIG. 5, the foreign substance exclusion portion 132 includes one or more rod-shaped members 132a and / or provided on a part of the outer peripheral surface 131a of the main body portion 131. Alternatively, it is formed by one or a plurality of plate-like members 132b.

  According to the support structure 100a of the first embodiment, the rod-like member 131a and / or the plate-like member 131b rotate with the rotation of the tilling shaft 110 around the axis, thereby entering the first labyrinth structure Q1. The dust to be tried can be removed, and this dust can be effectively eliminated.

Specifically, the rod-like member 132a and the plate-like member 132b are provided in the main body 131 so as to overlap the first labyrinth structure Q1 when viewed along the axial direction of the tilling shaft 110. . According to the support structure 100a having such a configuration, it is possible to effectively remove dust that tends to enter the first labyrinth structure Q1.
In addition, the said rod-shaped member 132a and / or the plate-shaped member 132b are provided radially centering on the axis line of the said tilling shaft 110 so that the radial direction of the said tilling shaft 110 may be followed here.

(Support structure 100b of 2nd Embodiment)
FIG. 6 is a perspective view showing the dust cover 130b and the tilling final shaft 111 provided with the dust cover 130b in the support structure 100b of the second embodiment.
In the support structure 100b of the second embodiment, the foreign matter exclusion portion 132 of the main body portion 131 is overlapped with the first labyrinth structure Q1 when viewed along the axial direction of the tilling shaft 110. It is formed by a flange member 132c provided over the entire outer peripheral surface 131a.

According to the support structure 100b of the second embodiment, the flange member 132c covers the first labyrinth structure Q1 from the outside, thereby preventing dust from entering the first labyrinth structure Q1. The dust can be effectively eliminated.
Furthermore, the rotation of the flange member 132c along with the rotation of the tilling shaft 110 allows the dust to enter the first labyrinth structure Q1 to be removed, thereby effectively removing the dust. Can be eliminated.
Here, the flange member 132c is formed of a disk-like member configured to overlap the first labyrinth structure Q1 when viewed along the axial direction of the tilling shaft 110.
The flange member 132c may be the flange members 132d, 132e, 132f, and 132g of the following first to fourth configuration examples.

FIG. 7 is a schematic diagram illustrating a first configuration example of the support structure 100b of the second embodiment. FIG. 7A is a diagram illustrating the dust cover 130b and the dust cover 130b according to the first configuration example. FIG. 7B is a rear view of the dust cover 130b in the first configuration example, and FIG. 7C is a dust cover 130b in the first configuration example. FIG.
As shown in FIG. 7, in the flange member 132d of the first configuration example, the surface 133 of the flange member 132d facing inward in the vehicle width direction is at least partly in the circumferential direction and is radially outward from the inner side. A tapered surface 132d ′ is provided so as to be located inward in the vehicle width direction as it goes in the other direction (in other words, as the thickness increases from the radially inner side to the outer side).
According to the support structure 100b including the first configuration example, the taper surface 132d ′ rotates with the rotation of the flange member 132d, thereby removing dust that tries to enter the first labyrinth structure Q1. This makes it possible to effectively eliminate the dust.

FIG. 8 is a schematic view showing second to fourth configuration examples of the support structure 100b of the second embodiment, and FIG. 8A shows the flange member 132e in FIG. 3 of the second configuration example. FIG. 8B is a view of the β portion viewed from above, and FIG. 8B is a state transition diagram of the β portion shown in FIG. 3 of the flange member 132f in the third configuration example as viewed from above, and FIG. These are the state transition diagrams which looked at the state where dust was discharged by centrifugal force from the side in the 2nd and 3rd example of composition shown in Drawing 8 (a) and Drawing 8 (b), and Drawing 8 (d) FIG. 5 is a view showing an α portion shown in FIG. 3 of a flange member 132g in the fourth configuration example.
As shown in FIG. 8, in the flange members 132e, 132f, 132g of the second to fourth configuration examples, the flange members 132e, 132f, 132g (here, the flange members 132e, 132f, 132g in the vehicle width direction). The outwardly facing surfaces 134, 135, 136) cooperate with the fixed side member (here, the hinge plate 152) to prevent dust from entering the first labyrinth structure Q1 from the outside. Two labyrinth structures Q2 are formed.
According to the support structure 100b provided with the second to fourth configuration examples, the second labyrinth structure Q2 can effectively prevent dust from entering the first labyrinth structure Q1, and eventually into the installation space P. Intrusion of dust can be more effectively prevented.

Specifically, in the second configuration example, as shown in FIG. 8A, uneven portions 134a and 134b are provided on a surface 134 of the flange member 132e facing outward in the vehicle width direction.
Specifically, the uneven portions 134 a and 134 b extend along the radial direction of the tilling shaft 110.
As for the said recessed part 134a, the said outer end part of the said radial direction is opening outward.
The concave portion 134a is preferably closed so that the radially inner end portion connects adjacent convex portions 134b.
Although not shown in the drawings, instead of the uneven portions 134a and 134b of the surface 134 of the flange member 132e facing outward in the vehicle width direction, the inside of the fixed side member (here, the hinge plate 152) in the vehicle width direction. An uneven portion may be provided on the surface facing the direction.

Further, in the third configuration example, as shown in FIG. 8B, uneven portions 135a, 135b are provided on the surface 135 of the flange member 132f facing outward in the vehicle width direction, and the fixed side member is provided. (Here, the hinge plate 152) has uneven portions 153a and 153b on the surface 153 facing inward in the vehicle width direction.
Specifically, the uneven portions 135 a and 135 b in the flange member 132 f and the uneven portions 153 a and 153 b in the fixed side member 152 extend along the radial direction of the tilling shaft 110.
In the recess 135a and the recess 153a, the outer ends in the radial direction are opened outward.
Further, the concave portion 135a and the concave portion 153a are preferably closed so that the radially inner end portions connect adjacent convex portions 135b.
Preferably, the concave and convex portions 135a and 135b in the flange member 132f and the concave and convex portions 153a and 153b in the fixed side member 152 are formed as concave portions (recess portions 135a as shown in FIG. 8B). And at least a portion of the recess 153a) may be overlapped. More preferably, the concave portions (the concave portion 135a and the concave portion 153a) face each other, and the convex portions (the convex portion 135b and the convex portion 153b) face each other.

  In the fourth configuration example, as shown in FIG. 8D, a concave portion (here, a concave portion 154a is formed on the opposed surface 154 of the hinge plate 152) on one of the opposed surfaces of the flange member 132g and the fixed side member. ) And a convex portion corresponding to the concave portion (here, a convex portion 136a corresponding to the concave portion 154a is provided on the opposed surface 136 of the flange member 132g).

According to the support structure 100b including the second to fourth configuration examples, the uneven portions (134a, 134b), the uneven portions (135a, 135b), (153a, 153b), and the uneven portions (154a, 136a). Can effectively prevent dust from entering the first labyrinth structure Q1, and in particular, the uneven portions (134a, 134b) of the second configuration example and the uneven portions (135a, 135b) of the third configuration example. , (153a, 153b), even if dust T penetrates into the concavo-convex portion, as shown in FIGS. 8 (a) and 8 (b), the dust T As shown in FIG. 8 (c), it is pushed by the wall X extending along the radial direction at 132f and rotates together with the flange members 132e and 132f. By centrifugal force generated Te, it can be discharged to the outside of the dust cover 130b.
Further, in the case of the concavo-convex portions (135a, 135b), (153a, 153b) of the third configuration example, dust T hits the wall Y extending along the radial direction in the fixed side member 152 and the dust T is applied to the dust cover 130b. It may be blown off to the outside and discharged.
In the case of the third configuration example, when the dust T moves from the narrow space where the convex portions 135b and the convex portions 153b face each other to the wide space where the concave portions 135a and the concave portions 153a face each other, the dust T This makes it easy to jump out of the dust cover 130b.

(Support structure 100c of 3rd Embodiment)
As shown in FIG. 4, in the support structure 100c according to the third embodiment, the foreign matter exclusion portion 132 is a cutting blade 132h.
Specifically, one or a plurality of the cutting blades 132h are provided radially around the axis of the tilling shaft 110 so as to be along the radial direction of the tilling shaft 110.

In addition, as another example of the support structure 100c according to the third embodiment in which a cutting blade is used for the foreign matter exclusion portion 132, for example, the following configuration can be given.
9 and 10 are diagrams showing another example of the support structure 100c of the third embodiment, and FIG. 9 is provided in the flange portion 137 and the flange portion 137 in the support structure 100c. FIG. 10 is a side view showing the cutting blade 132h ′, and FIG. 10 is a cross-sectional view showing a schematic configuration of the support structure. In FIG. 10, the flange portion 137 and the cutting blade 132 h ′ provided on the flange portion 137 show a cross section along the line AA in FIG. 9.

The support structure 100c includes a dust cover 130c ′.
As shown in FIG. 10, the dust cover 130 c ′ cooperates with a fixed member (here, the hollow holder 430 ′) to prevent dust from entering the installation space P from the outside. The connecting flange 111 is provided so as to form the structure Q1.
The dust cover 130c ′ includes a main body 131 that forms the first labyrinth structure Q1, and a foreign matter exclusion portion 132 that protrudes radially outward from the outer peripheral surface 131a of the main body 131. .

The main body 131 is formed in a bowl shape whose outer side in the vehicle width direction is open, and the outer side in the vehicle width direction that is opened cooperates with the hollow holder 430 ′ to form the first labyrinth structure Q1. Is forming.
Specifically, the hollow holder 430 ′ includes a holder portion 430a and a boss portion 430b protruding inward in the vehicle width direction from the holder portion 430a.
The main body 131 has an outer peripheral surface 131a ′ on the outer side in the vehicle width direction as close as possible to an inner peripheral surface 430b ′ of the boss portion 430b, and an outer peripheral surface 131a ′ on the outer side in the vehicle width direction. The first labyrinth structure Q1 is formed by the inner peripheral surface 430b ′.

Preferably, an end surface (end surface facing outward in the vehicle width direction) 131b of the main body 131 on the outer side in the vehicle width direction is a surface 430c (end of the main body 131 of the hollow holder 430 ′) facing inward in the vehicle width direction. The first labyrinth structure Q1 is formed by this portion as close as possible to the surface facing the end surface 131b.
More preferably, a concave portion 430d is formed on a surface 430c (a surface facing the end surface 131b of the main body portion 131) of the hollow holder 430 ′ facing inward in the vehicle width direction, and the main body portion 131 of the main body portion 131 is formed in the concave portion 430d. By positioning the outer end side in the vehicle width direction, the first labyrinth structure Q1 can be formed.

As shown in FIGS. 9 and 10, the foreign substance exclusion unit 132 is configured to overlap the first labyrinth structure Q <b> 1 when viewed along the axial direction of the tilling shaft 110. A flange portion 137 provided over the entire outer peripheral surface 131a, and one or a plurality (here, a plurality) of cutting blades 132h ′ provided on the outer peripheral edge of the flange portion 137 are provided.
Specifically, a plurality of the cutting blades 132h ′ are provided in a radial manner around the axis of the tilling shaft 110 so as to be along the radial direction of the tilling shaft 110.

  According to the support structure 100c of the third embodiment shown in FIG. 4, FIG. 9 and FIG. 10, dust such as grass and hail that is about to be wound around the foreign matter exclusion portion 132 by the cutting blades 132h and 132h ′. Therefore, it is possible to eliminate the wrapping of dust such as grass and firewood as much as possible, and thereby more effectively eliminate the dust entering the first labyrinth structure Q1. Is possible.

Further, in the support structure 100c of the third embodiment shown in FIGS. 9 and 10, the flange portion 137 cooperates with the fixed side member (here, the hollow holder 430), and the first labyrinth structure Q1. The 2nd labyrinth structure Q2 which prevents the penetration | invasion of the dust from the outside to the is formed.
According to the support structure 100c, the second labyrinth structure Q2 can effectively prevent dust from entering the first labyrinth structure Q1, and further effectively prevent dust from entering the installation space P. can do.

Specifically, the flange portion 137 includes a plate portion 137a that extends substantially in the vertical direction, and a boss portion 137b that protrudes outward from the plate portion 137a in the vehicle width direction.
A surface 137 ′ of the plate portion 137 a facing outward in the vehicle width direction is as close as possible to a surface 430 ′ of the hollow holder 430 facing inward in the vehicle width direction, and radially inward of the boss portion 137 b. Is directed as close as possible to the radially outward surface 430 ″ of the hollow holder 430, and the second labyrinth structure Q2 is formed by these portions.

FIG. 11 is a perspective view showing the cutting blades 132h and 132h ′ in the support structure 100c of the third embodiment, and FIG. 11A shows the cutting blade 132h in the support structure 100c shown in FIG. FIG. 11B shows the cutting blade 132h ′ in the support structure 100c shown in FIGS.
As shown in FIG. 11, the cutting blades 132h and 132h ′ have a tapered surface 138a in which the thickness h decreases in the forward direction of the connecting flange 111b (the direction of arrow A1 in FIG. 11).
In the support structure 100c having such a configuration, dust such as grass and straw can be effectively cut.

Further, the cutting blades 132h and 132h ′ have a tapered surface 138b in which the thickness h decreases in the reverse direction of the connecting flange 111b (in the direction of arrow A2 in FIG. 11) instead of or in addition to the above configuration. May be.
In the support structure 100c having such a configuration, dust such as grass and straw can be effectively cut when the connecting flange 111b rotates in the reverse rotation direction A2.

  In addition, although the support structures 100a, 100b, and 100c of the tillage shaft 110 according to the first to third embodiments are configured to be applied to the chain case 333 side that acts as the support member, You may comprise so that it may be applied to the said side frame 334 side which acts.

FIG. 1 is a side view showing a tractor to which a support structure for a tillage shaft according to first to third embodiments of 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 tillage shaft according to the first and second embodiments. FIG. 4 is a cross-sectional view illustrating a schematic configuration of a support structure for a tillage shaft according to the third embodiment. FIG. 5 is a perspective view showing a dust cover and a tilling final shaft provided with the dust cover in the support structure of the first embodiment. FIG. 6 is a perspective view showing a dust cover and a tilling final shaft provided with the dust cover in the support structure of the second embodiment. FIG. 7 is a schematic view showing a first configuration example of the support structure of the second embodiment, and FIG. 7A shows a dust cover in the first configuration example and a tilling final provided with the dust cover. FIG. 7B is a rear view of the dust cover in the first configuration example, and FIG. 7C is a side view of the dust cover in the first configuration example. FIG. 8 is a schematic view showing second to fourth configuration examples of the support structure of the second embodiment, and FIG. 8A shows the β portion shown in FIG. 3 of the flange member in the second configuration example. FIG. 8B is a state transition diagram of the flange member in the third configuration example as viewed from above, and FIG. 8C is a state transition diagram as viewed from above. FIG. 8 (a) and FIG. 8 (b) are state transition diagrams of the state in which dust is discharged by centrifugal force when viewed from the side in the second and third configuration examples, and FIG. It is a figure which shows (alpha) part shown in FIG. 3 of the flange member in a structural example. FIG. 9 is a side view showing a flange portion and a cutting blade provided on the flange portion in another example of the support structure of the third embodiment. FIG. 10 is a cross-sectional view illustrating a schematic configuration of another example of the support structure of the third embodiment. FIG. 11 is a perspective view showing a cutting blade in the support structure of the third embodiment, FIG. 11 (a) shows the cutting blade in the support structure shown in FIG. 4, and FIG. 9 and the cutting blade in the support structure shown in FIG.

Explanation of symbols

100a, 100b, 100c ... Tilling shaft support structure 101 ... Bearing portion 110 ... Tilling shaft
111 ... Tilling final shaft 111a ... Shaft body 111b ... Connection flange
112 ... Tilling claw shaft 130a, 130b, 130c, 130c '... Dust cover
131... Main body 131 a. Outer peripheral surface of main body 132..
132c, 132d, 132e, 132f, 132g ... flange member
132d '... Tapered surface of flange member 132h, 132h' ... Cutting blade
134a, 134b, 135a, 135b, 153a, 153b ... uneven portions
136a ... convex part 137 ... flange part 138a, 138b ... taper surface of cutting blade
152 ... Fixed side member 154a ... Recess 333 ... Support member
410: Bearing member 420 ... Oil seal member
P ... Installation space Q1 ... First labyrinth structure Q2 ... Second labyrinth structure

Claims (11)

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 dust cover provided on the coupling flange so as to form a first labyrinth structure that cooperates with the fixed side member to prevent dust from entering the installation space of the bearing member and the oil seal member from the outside. Prepared,
The dust cover includes a main body part forming the first labyrinth structure, and one or a plurality of foreign matter exclusion parts protruding radially outward from an outer peripheral surface of the main body part. Support structure for tillage shaft.   The foreign matter exclusion portion is formed by a flange member provided over the entire outer peripheral surface of the main body portion so as to overlap the first labyrinth structure when viewed along the axial direction of the tilling shaft. The support structure for a tillage shaft according to claim 1.   On the surface of the flange member facing inward in the vehicle width direction, a tapered surface is provided on at least a part of the circumferential direction so as to be positioned inward in the vehicle width direction from the radially inner side to the outer side. The support structure for a tillage shaft according to claim 2.   The said flange member cooperates with the said fixed side member, and forms the 2nd labyrinth structure which prevents the penetration | invasion of the dust from the outside to the said 1st labyrinth structure, The Claim 2 or 3 characterized by the above-mentioned. Support structure for tillage shaft.   The support structure for a tillage shaft according to claim 4, wherein an uneven portion is provided on a surface of the flange member facing outward in the vehicle width direction.   6. The support structure for a tillage shaft according to claim 4, wherein an uneven portion is provided on a surface of the fixed side member facing inward in the vehicle width direction.   5. The tiller shaft support according to claim 4, wherein a concave portion is provided on one of the opposing surfaces of the flange member and the fixed side member, and a convex portion corresponding to the concave portion is provided on the other. Construction.   The support structure for a tillage shaft according to claim 1, wherein the foreign matter exclusion portion is a cutting blade.   The foreign matter removing portion includes a flange portion provided over the entire outer peripheral surface of the main body portion so as to overlap the first labyrinth structure when viewed along the axial direction of the tilling shaft, and the flange The support structure for a tillage shaft according to claim 1, further comprising a cutting blade provided on an outer peripheral edge of the portion.   The tiller shaft support structure according to claim 8 or 9, wherein the cutting blade has a tapered surface whose thickness decreases as it goes in a forward rotation direction of the connecting flange.   The tiller shaft support structure according to any one of claims 8 to 10, wherein the cutting blade has a tapered surface whose thickness decreases as it goes in the reverse direction of the connecting flange.

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