JP5300183B2 - Support structure for tillage shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide support structures of tilling shafts having simple structures, which effectively prevent 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: In the support structures 100 and 100' of the tilling shaft 110, a hinge plate 140 is integrally equipped with a plate main body 141, a first invasion prevention part 142 which is installed on the plate main body 141 so as to prevent the invasion of dust from the outside on the installation space P of the bearing member 410 and the oil seal member 420 in cooperation with the plate main body 141 and the free end parts 132 and 132' of dust covers 130 and 130' and a second invasion prevention part 143 which has a base end part 143a fastened to the plate main body 141 outside of the first invasion prevention part 142 in radial direction and prevents invasion of dust from outside to the first invasion prevention part by a tip part 143b in cooperation with a connection flange 111b. <P>COPYRIGHT: (C)2008,JPO&amp;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 inwardly in a direction and a tilling claw shaft connected to the tilling final shaft through the connecting flange so as not to rotate relative to the tilling axis. A hinge plate that is externally attached to the bearing portion in a state of being connected to a side plate of the tillage cover, and a dust cover having a base end portion fixed to the connection flange, and the hinge plate is external to the bearing portion. In cooperation with the plate body to be inserted and the free end of the dust cover, dust can be prevented from entering the installation space of the bearing member and the oil seal member from the outside. A first intrusion prevention portion provided on the plate body, a base end portion fixed to the plate body radially outward from the first intrusion prevention portion, and a distal end portion cooperating with the connection flange, And a second intrusion prevention portion integrally preventing dust from entering the first intrusion prevention portion, wherein the first intrusion prevention portion is an insertion groove that opens inward in the vehicle width direction, The dust cover has a base end surface portion fixed in a state of being opposed to the vehicle width direction outer end surface of the connection flange, and a cover portion extending outward in the vehicle width direction from a radial outer end portion of the base end surface portion, The cover portion includes a region positioned radially outward from the radially outer end portion of the base end surface portion toward the outer side in the vehicle width direction, and a vehicle width direction along the axial direction of the tilling shaft from the distal end portion of the region. and a free end portion extending outward, the free end Providing a support structure for cultivating shaft, characterized in that it is inserted into the insertion groove in a state in which at a predetermined distance from a surface of said insertion groove.

  Examples of the support member include a chain case and a side frame. In addition, the bearing member and the oil seal member may be directly installed on the bearing portion. For example, the bearing member and the oil seal member may be installed on the opening via a hollow holder attached to the opening of the bearing portion. Also good.

  In the support structure for the tillage shaft according to the present invention, the end portion of the second intrusion prevention portion can be exemplified as extending to a position facing the outer peripheral surface of the connection flange.

  Moreover, in the support structure of the tilling shaft according to the present invention, it is preferable that the second intrusion prevention unit is configured to form a space between the dust cover and the second intrusion prevention unit.

According to the support structure for the tillage shaft according to the present invention, the hinge plate cooperates with the plate body externally inserted into the bearing portion and the free end portion of the dust cover, so that the bearing member and the oil seal member The first intrusion prevention part provided on the plate body so as to prevent dust from entering the installation space from the outside, and the plate body at a base end portion radially outward from the first intrusion prevention part The first intrusion prevention unit is integrally provided with the second intrusion prevention unit that is fixed to the front end and has a front end portion that cooperates with the connection flange to prevent intrusion of dust from the outside into the first intrusion prevention unit. The portion is an insertion groove that opens inward in the vehicle width direction, and the dust cover is fixed to the outer end surface in the vehicle width direction of the connection flange in a facing state, and the radially outer end of the base end surface portion. Vehicle width from section A cover portion extending outwardly, and the cover portion is positioned radially outward from the radially outer end portion of the base end surface portion in the vehicle width direction and the distal end portion of the region A free end portion extending outward in the vehicle width direction along the axial direction of the tilling shaft, and the free end portion is inserted into the insertion groove with a predetermined interval from the surface of the insertion groove. Therefore, for example, even if dust such as soil enters from between the second intrusion prevention unit and the connection flange, in order to enter the installation space, the first intrusion prevention unit It is necessary to pass between the dust cover and 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 intrusion prevention unit is configured such that a space is formed between the second intrusion prevention unit and the dust cover, for example, dust is generated from between the second intrusion prevention unit and the connection flange. Even if it has entered, the space formed between the second intrusion prevention part and the dust cover can act as a storage space for the intruding dust, and can delay the entry of the dust into the installation space. As a result, it is possible to more effectively prevent dust from entering the installation space.

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 a tillage shaft support structure 100 according to a first embodiment of 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. 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 first 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 first 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 dust cover 130 and a hinge plate 140.

  The dust cover 130 has a base end portion 131 fixed to the connecting flange 111b, and the tip end portion 132a is outside the vehicle width direction so as to cover the installation space P of the bearing member 410 and the oil seal member 420 here. It extends toward.

The hinge plate 140 is extrapolated to the bearing portion 101 in a state of being connected to the side plate 151 of the tillage cover 150, and includes a plate body 141, a first intrusion prevention portion 142, a second intrusion prevention portion 143, Is integrated.
The plate main body 141 is extrapolated to the bearing portion 101, and the first intrusion prevention portion 142 cooperates with the free end portion 132 of the dust cover 130 to generate dust from the outside to the installation space P. The plate main body 141 is provided so as to prevent the intrusion.
In addition, the second intrusion prevention part 143 has a base end part 143a fixed to the plate body 141 radially outward from the first intrusion prevention part 142 and a distal end part 143b cooperating with the connection flange 111b. It is configured to prevent dust from entering the first intrusion prevention unit from the outside.

According to the support structure 100 of the tillage shaft 110 according to the first embodiment, the hinge plate 140 integrally includes the plate body 141, the first intrusion prevention unit 142, and the second intrusion prevention unit 143. For example, even if dust such as soil enters from Q1 between the second intrusion prevention unit 143 and the connection flange 111b, in order for the dust to enter the installation space P, P1 must pass between the first intrusion prevention unit 142 and the dust cover 130, so that the intrusion of the dust into the installation space P can be continuously delayed.
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 first embodiment, the second intrusion prevention unit 143 is disposed between the dust cover 130 and the space Q (here, the second intrusion prevention unit 143, the dust cover 130, and the connection flange 111b). A space Q) surrounded by is formed.
By providing such a configuration, the support structure 100 of the tillage shaft 110 is configured so that, for example, even when dust enters from between the second intrusion prevention unit 143 and the connecting flange 111b, the space Q It acts as a storage space for the invading dust, can further delay the intrusion of the dust into the installation space P, and more effectively prevent the dust from entering the installation space P. .

The first embodiment will be described more specifically. An opening 333a is provided in the chain case 333 on the inside of the bearing portion 101 in the vehicle width direction.
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. 4 is a perspective view showing the dust cover 130 and the tilling final shaft 111 provided with the dust cover 130 in the support structure 100 of the tilling shaft 110 shown in FIG. 3.
As shown in FIGS. 3 and 4, the dust cover 130 is fixed to the outer end surface of the connecting flange 111b in the vehicle width direction in an opposing state (for example, formed integrally with the connecting flange 111b by a joining means such as welding). A ring-shaped base end surface portion 131a and a cover portion 132a extending outward in the vehicle width direction from the radially outer end portion of the base end surface portion 131a, and the free end portion 132 of the cover portion 132a is It is configured to be close to the first intrusion prevention unit 142.
The connecting flange 111b has a disk shape as shown in FIG.

  As shown in FIG. 3, the hinge plate 140 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.

Specifically, the plate main body 141 has a connecting portion 141 a connected to the side plate 151.
The first intrusion prevention part 142 has a circumferential shape around the axis of the tillage shaft 110 and a vehicle width so that the free end part 132 of the cover part 132a of the dust cover 130 can be inserted at a predetermined interval. The insertion groove extends outward in the direction.

  In addition, the second intrusion prevention part 143 has a base end part 143a fixed to the plate body 141 radially outward from the first intrusion prevention part 142, and a distal end part 143b having an outer peripheral surface 111b ′ of the connecting flange 111b. The connecting flange 111b extends outward in the vehicle width direction so as to face the vehicle.

FIG. 5 shows a support structure 100 ′ of the tillage shaft 110 according to the reference example .
Next, the support structure 100 ′ of the tillage shaft 110 according to the reference example will be described with reference to FIG.

FIG. 5 is a cross-sectional view showing a schematic configuration of the support structure 100 ′ according to the reference example .
The reference example has substantially the same configuration as the first embodiment except that a dust cover 130 ′ is provided instead of the dust cover 130 in the first embodiment, and detailed description thereof is omitted. . In FIG. 5, the same members as those in the first embodiment are denoted by the same reference numerals.

In the support structure 100 ′ of the tillage shaft 110 according to the reference example , the dust cover 130 ′ is fixed to the outer end surface in the vehicle width direction of the connection flange 111 b (for example, by welding means or the like). The free end portion 132 ′ is formed as a substantially cylindrical member that is close to the first intrusion prevention portion 142.
The first intrusion prevention part 142 has a circumferential shape around the axis of the tillage shaft 110 and a vehicle width so that the free end part 132 ′ of the dust cover 130 ′ can be inserted at a predetermined interval. The insertion groove extends outward in the direction.

The support structure 100 ′ of the tillage shaft 110 according to the reference example has the same effects as the support structure 100 of the tillage shaft 110 according to the first embodiment in the following points .
That is, for example, even if dust such as soil enters from Q1 between the second intrusion prevention portion 143 and the connecting flange 111b, the first intrusion further occurs in order for the dust to enter the installation space P. P1 must pass between the prevention part 142 and the dust cover 130 ′, and thus the intrusion of the dust into the installation space P can be continuously delayed. It is possible to effectively prevent dust such as soil from entering the wall.
Further, the second intrusion prevention part 143 has a space Q (here, the space Q surrounded by the second intrusion prevention part 143, the dust cover 130 ′ and the connecting flange 111b) between the dust cover 130 ′ and the dust cover 130 ′. ) Is formed. Therefore, for example, even when dust intrudes from Q1 between the second intrusion prevention portion 143 and the connection flange 111b, the space Q acts as a storage space for the intruding dust and enters the installation space P. It becomes possible to more effectively prevent dust from entering.

Further, the side frame support structure 10 0 of cultivating shaft 110 according to the first implementation mode has been configured to be applied to the chain case 333 side, which acts as the support member, which acts as the support member You may comprise so that it may be applied to 334 side.

FIG. 1 is a side view showing a tractor to which a support structure for a tillage shaft according to a first embodiment 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 embodiment. FIG. 4 is a perspective view showing a dust cover in the support structure for the tilling shaft shown in FIG. 3 and a tilling final shaft provided with the dust cover. FIG. 5 is a cross-sectional view illustrating a schematic configuration of a support structure for a tillage shaft according to a reference example .

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
111b '... outer peripheral surface of connecting flange 112 ... tilling claw shaft
130, 130 '... dust cover 131, 131' ... base end of dust cover
132, 132 '... Free end of dust cover 140 ... Hinge plate
141 ... Plate body 142 ... First intrusion prevention part 143 ... Second intrusion prevention part
143a: base end portion of second intrusion prevention portion 143b ... distal end portion of second intrusion prevention portion
150 ... Tillage cover 151 ... Side plate of tillage cover 333 ... Support member
410: Bearing member 420 ... Oil seal member P: Installation space
Q: Space between the dust cover and the connecting flange

Claims (3)

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 hinge plate extrapolated to the bearing portion in a state of being connected to a side plate of the tillage cover;
A base cover is provided with a dust cover fixed to the connecting flange,
The hinge plate cooperates with a plate body externally attached to the bearing portion and a free end portion of the dust cover to prevent dust from entering the installation space of the bearing member and the oil seal member from the outside. The first intrusion prevention part provided on the plate body and the base end part are fixed to the plate body radially outward from the first intrusion prevention part and the distal end part cooperates with the connecting flange. A second intrusion prevention unit integrally preventing dust from entering the first intrusion prevention unit from the outside;
The first intrusion prevention portion is an insertion groove that opens inward in the vehicle width direction,
The dust cover has a base end surface portion fixed in a state of being opposed to an outer end surface in the vehicle width direction of the connection flange, and a cover portion extending outward in the vehicle width direction from a radially outer end portion of the base end surface portion, The cover portion includes a region positioned radially outward from a radially outer end portion of the base end surface portion toward a vehicle width direction outward and a vehicle width along the axial direction of the tilling shaft from the distal end portion of the region. And a free end portion extending outward in the direction, and the free end portion is inserted into the insertion groove at a predetermined interval from the surface of the insertion groove.   The tiller shaft support structure according to claim 1, wherein a distal end portion of the second intrusion prevention portion extends to a position facing an outer peripheral surface of the connection flange.   The tiller shaft support structure according to claim 1, wherein the second intrusion prevention unit is configured such that a space is formed between the second intrusion prevention unit and the dust cover.

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