JP2015000641A - Crawler traveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler traveling device that is improved in durability of a sealing member, by configuring such that sludge and water are hard to arrive at the sealing member.SOLUTION: A crawler traveling device includes a support shaft 11 for supporting a rotating wheel 7 for traveling, a support case 10 for covering the outside of the support shaft 11, a bearing 12 and a sealing member 17. The device includes: a protrusion 18 protruding into the shaft core direction of the support shaft 11, at an end part 10a of the rotating wheel 7 side in the support case 10 and at one of a rotating portion 7b rotating integrally with the rotating wheel 7; and a recess 19 formed in a ring shape mainly on the shaft core of the support shaft 11 on the other among the end part 10a of the support case 10 and the rotating portion 7b, and opened in the shaft core direction of the support shaft 11. The direction and position of the protrusion 18 and recess 19 are set so that the protrusion 18 gets into the recess 19.

Description

  The present invention relates to a crawler traveling device provided in a farm vehicle such as a combine or a construction vehicle such as a backhoe.

Patent Documents 1 and 2 show a structure in the vicinity of a driving sprocket (corresponding to a rotating wheel for traveling) in a crawler traveling device provided in a combine.
In Patent Documents 1 and 2, a drive shaft (corresponding to a support shaft) to which a drive sprocket is fixed and a support case that covers the outside of the drive shaft are provided, and an outer peripheral portion of the drive shaft and an inner peripheral portion of the support case are provided. A bearing is provided therebetween, and a seal member is provided on the drive sprocket side of the bearing between the outer peripheral portion of the drive shaft and the inner peripheral portion of the support case.

In Patent Documents 1 and 2, a drive sprocket (a member that rotates integrally with the drive sprocket) is provided with a ring-shaped convex portion protruding toward the end of the support case, and a ring-shaped protrusion is provided at the end of the support case. The protrusion of the support case is projected so as to face the drive sprocket (a member that rotates integrally with the drive sprocket), and the end of the support case is located inside the protrusion of the drive sprocket (the member that rotates integrally with the drive sprocket). The convex part of the part has entered.
As a result, the durability of the seal member is ensured by preventing the mud and water applied to the vicinity of the drive sprocket from reaching the seal member immediately.

Japanese Patent Laying-Open No. 2011-179642 (see FIG. 16) JP 2009-34020 A (see FIG. 14)

In recent years, it has been demanded to improve the durability of the seal member due to an increase in the necessity of traveling in a work place with a lot of mud and water, and an increase in work time.
An object of the present invention is to improve the durability of a seal member by configuring the crawler travel device so that mud and water are less likely to reach the seal member.

(Constitution)
The features of the present invention are as follows in the crawler traveling device.
A rotating wheel for traveling, a support shaft that supports the rotating wheel, and a support case that covers the outside of the support shaft;
A bearing is provided between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, and between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, closer to the rotating wheel than the bearing. A sealing member,
One of the end portion on the rotating wheel side of the support case and the rotating portion that rotates integrally with the rotating wheel is provided with a convex portion protruding in the axial direction of the support shaft, and the end portion of the support case, On the other of the rotating parts, a recess formed in a ring shape centering on the axis of the support shaft and opened in the axial direction of the support shaft is provided.
The direction and position of the convex part and the concave part are set so that the convex part enters the concave part.

(Operation and effect of the invention)
In the case where a labyrinth portion is provided outside the seal member so that mud and water do not easily reach the seal member, in Patent Documents 1 and 2, a portion having a shape that is intruded by an inlay structure with a convex portion and a convex portion (hereinafter, The labyrinth portion is composed of a convex portion and a concave portion, and is more complicated than the labyrinth portion of Patent Documents 1 and 2 according to the feature of the present invention. A labyrinth club.
Thereby, according to the feature of the present invention, it is difficult for mud and water to pass through the labyrinth part by the convex part and the concave part, and it becomes difficult for mud and water to reach the sealing member, thereby improving the durability of the sealing member. Can do.

(Constitution)
The features of the present invention are as follows in the crawler traveling device.
A rotating wheel for traveling, a support shaft that supports the rotating wheel, and a support case that covers the outside of the support shaft;
A bearing is provided between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, and between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, closer to the rotating wheel than the bearing. A sealing member,
A ring-shaped wall member is provided between the inner peripheral portion of the end portion of the support case and the outer peripheral portion of the support shaft and closer to the rotating wheel than the seal member.

(Operation and effect of the invention)
According to the feature of the present invention, even if mud or water enters the inside of the end portion of the support case, the mud or water is obstructed by the wall member and is difficult to reach the seal member. Can be improved.

(Constitution)
The features of the present invention are as follows in the crawler traveling device.
A rotating wheel for traveling, a support shaft that supports the rotating wheel, and a support case that covers the outside of the support shaft;
A bearing is provided between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, and between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, closer to the rotating wheel than the bearing. A sealing member,
One of the end portion on the rotating wheel side of the support case and the rotating portion that rotates integrally with the rotating wheel is provided with a convex portion protruding in the axial direction of the support shaft, and the end portion of the support case, On the other of the rotating parts, a recess formed in a ring shape centering on the axis of the support shaft and opened in the axial direction of the support shaft is provided.
Set the direction and position of the convex part and the concave part so that the convex part enters the concave part,
A ring-shaped wall member is provided between the inner peripheral portion of the end portion of the support case and the outer peripheral portion of the support shaft, and between the convex portion and the concave portion and the seal member.

(Operation and effect of the invention)
In the case where a labyrinth portion is provided outside the seal member so that mud and water do not easily reach the seal member, in Patent Documents 1 and 2, the labyrinth portion is configured by an inlay structure including a convex portion and a convex portion. On the other hand, according to the feature of the present invention, the labyrinth portion is constituted by the convex portion and the concave portion, and a labyrinth portion that is more complicated than the labyrinth portion of Patent Documents 1 and 2 is obtained.
Thereby, according to the feature of the present invention, it is difficult for mud and water to pass through the labyrinth part by the convex part and the concave part, and it becomes difficult for mud and water to reach the sealing member, thereby improving the durability of the sealing member. Can do.

As described above, even if the labyrinth portion including the convex portion and the concave portion is provided outside the seal member, it is expected that mud and water pass through the labyrinth portion and enter the inside of the end portion of the support case.
According to the feature of the present invention, even if mud or water passes through the labyrinth part and enters the inside of the end portion of the support case, the mud or water is obstructed by the wall member and does not easily reach the seal member. The durability of can be improved.

(Constitution)
It is preferable to have the following features of the present invention.
The convex portion is formed in a ring shape centered on the axis of the support shaft.

(Operation and effect of the invention)
In addition to the concave portion being continuous in a ring shape, if the convex portion is configured to be continuous in a ring shape as in the feature of the present invention, which of the outer peripheral portion of the labyrinth portion is formed by the convex portion and the concave portion. Even if mud or water intrudes from the part, the mud and water must pass through the labyrinth part by the convex part and the concave part. Can be improved.

(Constitution)
It is preferable to have the following features of the present invention.
The convex portion is provided at an end portion of the support case so as to face the rotating portion, and the concave portion is provided at the rotary portion so as to face an end portion of the support case.

(Operation and effect of the invention)
For example, as shown in Patent Documents 1 and 2, the area of the rotating portion that faces the end of the support case may be larger than the area of the portion that faces the rotating portion at the end of the supporting case. It is thought that there are many.
According to the feature of the present invention, by providing the rotating part with a concave part that seems to require a larger installation area (large radial width) than the convex part, the concave part can be reasonably provided in the rotating part and produced. This is advantageous in terms of cost.

(Constitution)
It is preferable to have the following features of the present invention.
The outer peripheral portion of the wall member is in contact with the inner peripheral portion of the end portion of the support case.

(Operation and effect of the invention)
According to the feature of the present invention, when mud or water enters the inside of the end of the support case, the mud or water passes between the inner periphery of the end of the support case and the outer periphery of the wall member. It is unlikely to reach the seal member, and mud and water will reach the seal member if it does not move to the inner peripheral side (support shaft side) of the wall member and exceed the inner peripheral portion of the wall member. Can not do it. Accordingly, even if mud or water enters the inside of the end portion of the support case, the mud and water are obstructed by the wall member and hardly reach the seal member, and the durability of the seal member can be improved. .

(Constitution)
It is preferable to have the following features of the present invention.
The outer peripheral portion of the wall member has a predetermined width along the axial direction of the support shaft and is in contact with the inner peripheral portion of the end portion of the support case.

(Operation and effect of the invention)
When the outer peripheral portion of the wall member has a predetermined width along the axial direction of the support shaft and contacts the inner peripheral portion of the end portion of the support case as in the feature of the present invention, the end of the support case The length (width) of the contact portion between the inner peripheral portion of the portion and the outer peripheral portion of the wall member is large, and the sealing performance of the contact portion between the inner peripheral portion of the end portion of the support case and the outer peripheral portion of the wall member is high. It becomes a thing (it becomes difficult to pass mud and water).
As a result, even if mud or water enters the inside of the end of the support case, the mud or water passes between the inner periphery of the end of the support case and the outer periphery of the wall member and reaches the seal member. This further reduces the durability of the seal member.

(Constitution)
It is preferable to have the following features of the present invention.
The wall member is formed of a flexible member.

(Operation and effect of the invention)
According to the feature of the present invention, for example, the outer peripheral part of the wall member is set to be slightly larger than the inner peripheral part of the end part of the support case, and the inner peripheral part of the end part of the support case is elastically deformed while the wall member is elastically deformed. The outer peripheral portion of the wall member is pressed against the inner peripheral portion of the end portion of the support case, and the sealability of the contact portion between the inner peripheral portion of the end portion of the support case and the outer peripheral portion of the wall member is further increased. It becomes expensive (more difficult to pass mud and water).
As a result, even if mud or water enters the inside of the end of the support case, the mud or water passes between the inner periphery of the end of the support case and the outer periphery of the wall member and reaches the seal member. This further reduces the durability of the seal member.

(Constitution)
It is preferable to have the following features of the present invention.
A groove portion into which the outer peripheral portion of the wall member enters is provided in the inner peripheral portion of the end portion of the support case.

(Operation and effect of the invention)
According to the feature of the present invention, the outer peripheral portion of the wall member enters the groove portion of the inner peripheral portion of the end portion of the support case, thereby sealing the contact portion between the inner peripheral portion of the end portion of the support case and the outer peripheral portion of the wall member. It becomes more highly prone (more difficult to pass mud and water).
As a result, even if mud or water enters the inside of the end of the support case, the mud or water passes between the inner periphery of the end of the support case and the outer periphery of the wall member and reaches the seal member. This further reduces the durability of the seal member.

  According to the features of the present invention, the outer peripheral portion of the wall member enters the groove portion of the inner peripheral portion of the end portion of the support case, whereby the position of the wall member at the end portion of the support case is determined, and inside the end portion of the support case Since it becomes difficult for the wall member to move, it is difficult for the wall member to move from a predetermined position (the groove portion on the inner peripheral portion of the end portion of the support case) and to exhibit the desired performance.

(Constitution)
It is preferable to have the following features of the present invention.
The wall member is a non-flexible seal portion positioned between a flexible seal portion that contacts an end portion of the support case, and an inner peripheral portion of the end portion of the support case and an outer peripheral portion of the support shaft. And a ring portion.

(Operation and effect of the invention)
According to the characteristics of the present invention, the wall member is mainly composed of an inflexible ring portion, so that the wall member is entirely hard. Thereby, even if mud or water enters the inside of the end of the support case and contacts the wall member, the wall member is hardly deformed, and the performance of the wall member can be maintained for a relatively long time.

(Constitution)
It is preferable to have the following features of the present invention.
The seal member includes an inner annular member, an outer annular member, and a seal lip member between the inner annular member and the outer annular member,
The gap between the convex portion and the concave portion between the inner annular member and the outer annular member is located on the inner peripheral side of the end portion of the support case in the radial direction of the seal member.

(Operation and effect of the invention)
The seal member is generally configured with an inner annular member, an outer annular member, and a seal lip member between the inner annular member and the outer annular member, so that there is a gap between the inner annular member and the outer annular member. If mud or water enters the inside of the sealing member, the wear of the sealing member is accelerated.

According to the feature of the present invention, the gap on the wall member side between the inner annular member and the outer annular member is located on the inner peripheral side of the end portion of the support case in the radial direction of the seal member. Yes.
As a result, even if mud or water enters the inside of the end of the support case and moves to the inner peripheral side of the wall member and exceeds the inner peripheral portion of the wall member to the seal member side, the gap of the seal member remains the wall member. Therefore, mud and water are unlikely to reach the gap between the seal members.
Therefore, even if mud or water enters the inside of the end portion of the support case, the mud and water are obstructed by the wall member and hardly reach the gap of the seal member, and the durability of the seal member can be improved. .

(Constitution)
It is preferable to have the following features of the present invention.
In the rotating part that rotates integrally with the rotating wheel, an inner recessed part opened toward the seal member is provided in a part between the projecting part and the recessed part and the outer peripheral part of the support shaft.

(Operation and effect of the invention)
According to the feature of the present invention, even if mud or water enters the inside of the end portion of the support case, it is considered that mud or water is temporarily held in the inner concave portion. It is unlikely that mud or water that has entered the inside of the part immediately reaches the seal member.
Thereby, even if mud or water enters the inside of the end portion of the support case, the state in which the mud or water reaches the seal member can be delayed, and the durability of the seal member can be improved.

(Constitution)
It is preferable to have the following features of the present invention.
The inner recess is formed in a ring shape centered on the axis of the support shaft.

(Operation and effect of the invention)
According to the feature of the present invention, the inner recess is continuously formed around the support shaft, and the volume of the inner recess is increased, so that mud and water enter the end of the support case. However, it is conceivable that a large amount of mud or water is temporarily held in the inner recess.
Thereby, even if mud or water enters the inside of the end portion of the support case, the state in which the mud or water reaches the seal member can be delayed, and the durability of the seal member can be improved.

(Constitution)
It is preferable to have the following features of the present invention.
The position of the rotating portion is determined by contacting the rotating portion that rotates integrally with the rotating wheel between the inner peripheral portion of the seal member and the outer peripheral portion of the support shaft, and the sealing member is moved by the rotating portion. It has a collar member that prevents being pressed,
At the contact portion between the rotating portion and the collar member, an O-ring is provided at an end portion on the collar member side in an inner peripheral portion of the rotating portion or an end portion on the rotating portion side in an inner peripheral portion of the collar member. With a storage groove for storage,
The storage groove portion includes a ring-shaped first surface portion parallel to a radial direction centered on the axis of the support shaft, and a ring-shaped second surface portion along the axis direction of the support shaft. ing.

(Operation and effect of the invention)
When the seal member is provided, the rotation rotates integrally with the rotating wheel between the inner peripheral portion of the seal member and the outer peripheral portion of the support shaft in order to prevent the seal member from being pressed and damaged by the rotating portion. There may be provided a collar member that determines the position of the rotating part by contacting the part and prevents the seal member from being pressed by the rotating part.
In this case, the mud and water that have entered the inside of the end of the support case pass through the contact portion between the rotating portion and the collar member and do not reach the outer periphery of the support shaft. An O-ring may be provided at the contact portion.

According to the feature of the present invention, when the inner groove of the rotating portion is provided with an O-ring storage groove at the end of the collar member side or at the end of the inner periphery of the collar member on the rotating portion side, A storage groove portion is configured by including a ring-shaped first surface portion parallel to the radial direction around the axis of the support shaft and a ring-shaped second surface portion along the axis direction of the support shaft.
Thereby, for example, when the storage groove portion is provided at the end portion on the collar member side in the inner peripheral portion of the rotation portion, the first surface portion of the storage groove portion and the surface portion on the rotation portion side of the collar member are in a parallel state. Is sandwiched between the first surface portion of the storage groove portion and the surface portion on the rotating portion side of the collar member, so that a force that presses the O-ring against the outer peripheral portion of the support shaft is unlikely to occur.
Therefore, for example, when a spline portion is formed on the outer peripheral portion of the support shaft, it is difficult for the O-ring to be worn by being pressed against the spline portion of the support shaft, and the durability of the O-ring can be improved. it can.

It is a side view of a crawler traveling device. It is sectional drawing of the vicinity of a driving wheel. It is sectional drawing of the vicinity of a sealing member. It is sectional drawing of the vicinity of the sealing member in 1st another form of implementation of invention. It is sectional drawing of the vicinity of the sealing member in 2nd another form of implementation of invention. It is sectional drawing of the vicinity of the sealing member in 3rd another form of implementation of invention. It is sectional drawing of the vicinity of the sealing member in 3rd another form of implementation of invention. It is sectional drawing of the vicinity of the sealing member in 3rd another form of implementation of invention. It is sectional drawing of the vicinity of the sealing member in 3rd another form of implementation of invention. It is sectional drawing of the vicinity of the sealing member in 4th another form of implementation of invention. It is a vertical front view of the vicinity of a wheel in the 6th another form of implementation of the invention.

[1]
FIG. 1 shows right and left crawler travel devices provided in a normal combine that is an example of an agricultural work vehicle. First, an outline of the crawler traveling device will be described.
As shown in FIG. 1, the crawler traveling device is supported by a track frame 2 supported by the body frame 1, a plurality of rolling wheels 3 supported by the track frame 2, a guide wheel 4 and a crawler guide 5, and the body frame 1. The upper wheel 6, the driving wheel 7 (corresponding to a rotating wheel) supported by the body frame 1, the crawler belt 8 and the like are provided.

[2]
Next, the drive wheel 7 will be described.
As shown in FIGS. 1 and 2, a mission case 9 is supported on the fuselage frame 1, and right and left drive shafts 11 (corresponding to support shafts) extend laterally from the mission case 9. The outer side of the drive shaft 10 is covered with cylindrical right and left axle cases 10 (corresponding to support cases) fixed to 9. A cylindrical end portion 10 a (corresponding to an end portion on the rotating wheel side of the support case) having a larger diameter than the center side of the axle case 10 is fixed to the axle case 10, and the outer peripheral portion of the drive shaft 11 and the axle case 10. A bearing 12 is provided between the end 10a and the inner periphery of the end 10a, and the position of the bearing 12 is determined by a stopper ring 13 provided on the inner periphery of the end 10a of the axle case 10.

  As shown in FIG. 2, the drive wheel 7 includes an outer portion 7a and an inner portion 7b (corresponding to a rotating portion that rotates integrally with the rotating wheel), and the outer portion 7a and the inner portion 7b are connected by a bolt 7c and a pin 7d. Has been configured. A claw portion 7e that hits a metal core (not shown) provided in the crawler belt 8 is provided in the outer portion 7a, and a spline portion 7f is provided in the inner peripheral portion of the inner portion 7b.

  As shown in FIG. 2, the spline portion 11 a is provided at the end of the drive shaft 11, and the spline portion 7 f of the drive wheel 7 is attached to the spline portion 11 a of the drive shaft 11. On the outer periphery of the drive shaft 11, a ring-shaped collar member 14 is attached between the inner portion 7b of the drive shaft 11 and the bearing 12, and the collar member 14 and the bearing 12 come into contact with each other so that the drive wheel 7 The inner part 7b of the lens and the collar member 14 are in contact with each other.

  As shown in FIG. 2, a screw shaft portion 11 b is provided at the end of the drive shaft 11, and a ring member 15 is attached to the outer periphery of the screw shaft portion 11 b of the drive shaft 11, so 7b and the ring member 15 are in contact. A nut 16 is attached to the screw shaft portion 11 b of the drive shaft 11, and the nut 16 is brought into contact with the ring member 15 and tightened to determine the position of the drive wheel 7 with respect to the drive shaft 11. It is fixed to the end of the.

[3]
Next, the seal member 17 will be described.
As shown in FIGS. 2 and 3, a seal member 17 is attached to the outer peripheral portion of the collar member 14, and a bearing is provided between the outer peripheral portion of the drive shaft 11 and the inner peripheral portion of the end portion 10 a of the axle case 10. A seal member 17 is provided closer to the drive wheel 7 than 12.

  As shown in FIG. 3, the seal member 17 includes a metal inner annular member 17a with rubber attached to the inner peripheral surface, a metal outer annular member 17b with rubber attached to the outer peripheral surface, and an inner annular member. A seal lip member 17c between the outer annular member 17b and the outer annular member 17b is provided. A gap 17d between the inner annular member 17a and the outer annular member 17b on the side of the drive wheel 7 (the convex portion 18 and the concave portion 19 side described later) is the inner circumference of the end portion 10a of the support case 10 in the radial direction of the seal member 17. It is located on the part side.

  As shown in FIG. 3, a ring-shaped and convex positioning portion 14 a is provided on the outer peripheral portion of the collar member 14, and a step portion 10 b is provided on the inner peripheral portion of the end portion 10 a of the axle case 10. The inner annular member 17a of the seal member 17 contacts the positioning portion 14a of the collar member 14, and the outer annular member 17b of the seal member 17 contacts the step portion 10b of the axle case 10, whereby the position of the seal member 17 is determined. ing.

  2 and 3, the length of the seal member 17 in the direction of the axis P1 of the drive shaft 11 (left and right direction in FIG. 3) is larger than the length of the collar 14 in the direction of the axis P1 (see FIG. 3). The length in the left-right direction) is long. Thus, even when the nut 16 is tightened, the inner portion 7b of the drive wheel 7 is unlikely to contact the seal member 17, and the seal member 17 is not pressed by the inner portion 7b of the drive wheel 7.

[4]
Next, the labyrinth portion provided between the drive wheel 7 and the end portion 10a of the axle case 10 will be described.
As shown in FIGS. 2 and 3, the shaft core P <b> 1 of the drive shaft 11 is attached to the end portion 10 a of the axle case 10 at a portion where the end portion 10 a of the axle case 10 and the inner portion 7 b of the drive wheel 7 face each other. A convex portion 18, which has a ring shape as a center and protrudes in the direction of the axis P <b> 1 of the drive shaft 11, is provided so as to face the inner portion 7 b of the drive wheel 7.

  As shown in FIGS. 2 and 3, the shaft core P <b> 1 of the drive shaft 11 is attached to the inner portion 7 b of the drive wheel 7 in a portion where the end portion 10 a of the axle case 10 and the inner portion 7 b of the drive wheel 7 face each other. A concave portion 19 that is open in the direction of the axis P1 of the drive shaft 11 in a ring shape as a center is provided so as to face the end portion 10a of the axle case 10.

  As shown in FIG. 3, the concave portion 19 includes an outer ring-shaped first convex portion 19a, an inner ring-shaped second convex portion 19b, and a bottom portion 19c between the first and second convex portions 19a, 19b. It is comprised, and the 2nd convex part 19b has come out to the edge part 10a side of the axle case 10 rather than the 1st convex part 19a. The direction and position of the convex portion 18 and the concave portion 19 are set so that the convex portion 18 enters the concave portion 19 (between the first and second convex portions 19a and 19b). Since it is in a rotating state, the labyrinth portion that prevents mud and water from entering the inside of the end portion 10 a of the axle case 10 from the outside is constituted by the convex portion 18 and the concave portion 19.

As shown in FIG. 2 and FIG. 3, a ring-like shape opened toward the seal member 17 in a portion between the convex portion 18 and the concave portion 19 and the outer peripheral portion of the drive shaft 11 in the inner portion 7 b of the drive wheel 7. A concave inner recess 20 is provided.
Thereby, even if mud or water passes between the convex portion 18 and the concave portion 19 from the outside and enters the inside of the end portion 10a of the axle case 10, the mud or water is retained in the inner concave portion 20, Mud and water are difficult to reach the seal member 17 (gap 17d).

[5]
Next, a structure for preventing mud and water from entering the drive wheels 7 and the spline portions 7f and 11a of the drive shaft 11 will be described.
As shown in FIGS. 2 and 3, the end of the inner peripheral portion of the collar member 14 on the bearing 12 side is notched, and an inclined surface 14 b that is inclined with respect to the shaft core P <b> 1 of the drive shaft 11 is formed. An O-ring 21 is attached to a space having a triangular cross section between the outer peripheral surface of the drive shaft 11, the bearing 12, and the inclined surface 14b of the collar member 14.

  As shown in FIGS. 2 and 3, at the contact portion between the inner portion 7 b of the drive wheel 7 and the collar member 14, the end portion on the collar member 14 side of the inner peripheral portion of the inner portion 7 b of the drive wheel 7 has an L-shaped cross section. A shaped storage groove 22 is provided. The storage groove 22 includes a ring-shaped first surface portion 22a parallel to the radial direction centered on the axis P1 of the drive shaft 11, and a ring-shaped second surface portion 22b along the direction of the axis P1 of the drive shaft 11. It is prepared for.

As shown in FIGS. 2 and 3, the O-ring 23 is attached to the storage groove portion 22, and mud and water that have entered the inner side of the end portion 10 a of the axle case 10 are separated from the inner portion 7 b of the drive wheel 7 and the collar member. The O-ring 23 prevents the drive wheel 7 and the spline portions 7 f and 11 a of the drive shaft 11 from reaching the contact portion with the O ring 23.
In this case, the storage groove portion 22 may be provided not on the inner side portion 7b of the drive wheel 7 but on the end portion on the drive wheel 7 side of the inner peripheral portion of the collar member 14, and the storage groove portion 22 may be provided on the inner side portion 7b of the drive wheel 7 and You may provide in both the inner peripheral parts of the collar member 14. FIG.

  As shown in FIG. 2, a packing 24 is provided in the space between the inner portion 7 b of the drive wheel 7, the drive shaft 11, and the ring member 15. Thus, the packing 24 prevents mud and water from reaching the drive wheel 7 and the spline portions 7f and 11a of the drive shaft 11 from between the screw shaft portion 11b of the drive shaft 11 and the ring member 15. The packing 24 prevents mud and water from reaching the drive wheel 7 and the spline portions 7 f and 11 a of the drive shaft 11 from between the inner portion 7 b of the drive wheel 7 and the ring member 15.

  As shown in FIGS. 2 and 3, a recess 19 (first and second protrusions 19 a, 19 b, bottom 19 c), an inner recess is formed in the inner portion 7 b of the drive wheel 7 on the end 10 a side of the axle case 10. The processing parts 20 and the storage groove part 22 are gathered and provided. In this way, the machining cost is reduced by consolidating a plurality of machining portions into one portion, that is, the portion on the end portion 10a side of the axle case 10 in the inner portion 7b of the drive wheel 7.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Mode for Carrying Out the Invention], a wall member 25 as shown below may be added.
As shown in FIG. 4, the wall member 25 is a ring-shaped disk and is integrally formed of a flexible member made of rubber or the like, and the wall member 25 (the inner peripheral portion 25a and the outer peripheral portion 25b) is driven. A predetermined width (thickness) is provided in the direction of the axis P1 of the shaft 11 (left and right direction in FIG. 4).

  As shown in FIG. 4, a groove portion 10 c into which the outer peripheral portion 25 b of the wall member 25 enters is provided in the inner peripheral portion of the end portion 10 a of the axle case 10, and the outer peripheral portion 25 b of the wall member 25 is a groove portion of the axle case 10. The wall member 25 is attached to the inner peripheral portion of the end portion 10a of the axle case 10 by entering into 10c.

  In the state shown in FIG. 4, the wall member 25 is provided between the inner peripheral portion of the end portion 10 a of the axle case 10 and the outer peripheral portion of the drive shaft 11 and between the convex portion 18 and the concave portion 19 and the seal member 17. It is in a state equipped. In a state where the outer peripheral portion 25b of the wall member 25 is in contact with the inner peripheral portion (groove portion 10c) of the end portion 10a of the axle case 10, the wall member 25 is in a state facing (in a state of closing) the inner concave portion 20. The inner peripheral portion 25 a of the wall member 25 is slightly away from the inner portion 7 b of the drive wheel 7 and the collar member 14.

As a result, as shown in FIG. 4, even if mud or water passes between the convex portion 18 and the concave portion 19 from the outside and enters the inside of the end portion 10 a of the axle case 10, the mud or water does not enter the wall member 25. And is guided to the inner recess 20 without reaching the gap 17d of the seal member 17.
Even if mud or water in the inner concave portion 20 comes out of the inner concave portion 20 and goes to the seal member 17 side, there is a gap between the inner peripheral portion 25a of the wall member 25 and the inner portion 7b of the driving wheel 7 and the collar member 14. Due to the small size, mud and water in the inner recess 20 are difficult to go out of the inner recess 20 and to the seal member 17 side.
Even if mud or water passes the inner peripheral portion 25a of the wall member 25 toward the seal member 17 side, the gap 17d of the seal member 17 remains on the inner peripheral portion side of the end portion 10a of the axle case 10 from the inner peripheral portion 25a of the wall member 25. Therefore, it is difficult for mud and water to reach the gap 17 d of the seal member 17.

[Second Embodiment of the Invention]
Instead of the wall member 25 of the above-mentioned [first another embodiment of the invention], a wall member 26 as shown below may be provided.
As shown in FIG. 5, the wall member 26 has an inner first ring portion 26 a (corresponding to a ring portion) parallel to the radial direction around the axis P <b> 1 of the drive shaft 11, and the axis P <b> 1 of the drive shaft 11. A second ring portion 26b (corresponding to the ring portion) along the outer periphery, a third ring portion 26c on the outer side parallel to the radial direction around the axis P1 of the drive shaft 11, and a seal portion 26d are provided.
The first, second, and third seal portions 26a, 26b, and 26c are made of metal, hard plastic, or the like, are rigid and integrally configured, and are non-flexible, and the seal portion 26d is made of rubber or the like to be flexible. The sealing part 26d is attached to the outer peripheral part of the 2nd ring part 26b.

  As shown in FIG. 5, the seal portion 26 d of the wall member 26 is in contact with the inner peripheral portion of the end portion 10 a (the convex portion 18) of the axle case 10, and the third ring portion 26 c of the wall member 26 is the end of the axle case 10. The wall member 26 is attached to the end portion 10a of the axle case 10 so as to come into contact with the tip portion of the portion 10a (the convex portion 18). In this state, the convex portion 18, the second and third ring portions 26 b and 26 c of the wall member 26, and the seal portion 26 d enter the concave portion 19.

  In FIG. 5, similarly to FIG. 4, a ring-shaped concave shape opened toward the seal member 17 in a portion between the convex portion 18 and the concave portion 19 and the outer peripheral portion of the drive shaft 11 in the inner portion 7 b of the drive wheel 7. The inner recess 20 may be provided.

[Third Another Embodiment of the Invention]
The wall member 26 of the above-mentioned [second alternative embodiment of the invention] may be configured as follows.
As shown in FIG. 6, the wall member 26 includes a first ring portion 26a, a second ring portion 26b, a third ring portion 26c, and a seal portion 26d similar to those in FIG. 5, and the third ring portion 26c. A seal portion 26d is attached to the end.
As a result, the second ring portion 26b of the wall member 26 comes into contact with the inner peripheral portion of the end portion 10a (convex portion 18) of the axle case 10, and the seal portion 26d (third ring portion 26c) of the wall member 26 becomes the axle. The wall member 26 is attached to the end portion 10a of the axle case 10 so as to come into contact with the tip end portion of the end portion 10a (convex portion 18) of the case 10.

As shown in FIG. 7, the wall member 26 includes a first ring portion 26a, a second ring portion 26b, a third ring portion 26c, and a seal portion 26d similar to those in FIG. A series of seal portions 26d are attached over the ring portions 26b and 26c.
Accordingly, the seal portion 26d (second ring portion 26b) of the wall member 26 comes into contact with the inner peripheral portion of the end portion 10a (convex portion 18) of the axle case 10, and the seal portion 26d (third ring) of the wall member 26 is contacted. The wall member 26 is attached to the end portion 10a of the axle case 10 so that the portion 26c) contacts the tip end portion of the end portion 10a (convex portion 18) of the axle case 10.

As shown in FIG. 8, the wall member 26 includes a first ring portion 26a, a second ring portion 26b, a third ring portion 26c, and a seal portion 26d similar to those in FIG. Separate seal portions 26d are attached to the ring portions 26b and 26c.
Accordingly, the seal portion 26d (second ring portion 26b) of the wall member 26 comes into contact with the inner peripheral portion of the end portion 10a (convex portion 18) of the axle case 10, and the seal portion 26d (third ring) of the wall member 26 is contacted. The wall member 26 is attached to the end portion 10a of the axle case 10 so that the portion 26c) contacts the tip end portion of the end portion 10a (convex portion 18) of the axle case 10.

As shown in FIG. 9, the wall member 26 includes a first ring portion 26a, a second ring portion 26b, and a seal portion 26d similar to those in FIG. 5, and does not include the third ring portion 26c. A seal portion 26d is attached to the two-ring portion 26b.
Thereby, the wall member 26 is in the end portion of the axle case 10 so that the seal portion 26d (second ring portion 26d) of the wall member 26 is in contact with the inner peripheral portion of the end portion 10a (convex portion 18) of the axle case 10. 10a.
In the above-mentioned [Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] [Second Alternative Embodiment of the Invention] and [Third Alternative Embodiment of the Invention], the wall member 25 and the wall Both members 26 may be provided.

[Fourth Embodiment of the Invention]
In the above-mentioned [Mode for Carrying Out the Invention], the following configuration may be adopted.
As shown in FIG. 10, between the driving wheel 7 and the end portion 10a of the axle case 10, a ring-shaped cover member 27 separate from the driving wheel 7 (corresponding to a rotating portion that rotates integrally with the rotating wheel). Are attached to the outer peripheral portion of the drive shaft 7 so as to rotate integrally with the drive wheel 7 and the drive shaft 11, the concave portions (first and second convex portions 19a, 19b, bottom 19c) and the inner concave portion 20 are covered. The member 27 may be provided. In this case, the 1st convex part 19a of the recessed part 19 has come out to the edge part 10a side of the axle case 10 rather than the 2nd convex part 19b.

In FIG. 10, the wall member 25 or the wall member 26 of the above-mentioned [first alternative embodiment of the invention] [second alternative embodiment of the invention] [third alternative embodiment of the invention] may be provided. Both the wall member 25 and the wall member 27 may be provided.
In FIG. 10, when the wall members 25 and 26 are provided, the convex portion 18 and the concave portion 19 are eliminated, and the end portion 10a of the axle case 10 is configured to face the cover member 27 with a small gap therebetween. As in Patent Documents 1 and 2, a labyrinth portion having an inlay structure including a convex portion and a convex portion may be configured between the end portion 10 a of the axle case 10 and the cover member 27. In FIG. 10, when the wall members 25 and 26 are provided, the inner recess 20 may be eliminated.

[Fifth Embodiment of the Invention]
In the above-mentioned [first alternative embodiment of the invention] [second alternative embodiment of the invention] [third alternative embodiment of the invention] (FIGS. 4 to 9), the convex portion 18 and the concave portion 19 are eliminated. The end portion 10a of the axle case 10 is configured so as to face the inner portion 7b of the drive wheel 7 with a small gap therebetween, or an inlay structure with convex portions and convex portions as in Patent Documents 1 and 2. The labyrinth portion may be configured between the end portion 10a of the axle case 10 and the inner portion 7b of the drive wheel 7 so that only the wall member 26 or the wall member 26 is provided. In this case, in the above-described configuration, both the wall member 26 and the wall member 27 may be provided.
In the above-mentioned [first alternative embodiment of the invention] [second alternative embodiment of the invention] [third alternative embodiment of the invention] (FIGS. 4 to 9), the inner recess 20 may be eliminated. .

[Sixth Embodiment of the Invention]
When the present invention is applied to the wheel 3 (corresponding to a rotating wheel), it may be configured as shown in FIG.
As shown in FIG. 11, a bracket 28 a is fixed to the cylindrical support case 28 by welding, and the bracket 28 a of the support case 28 is fixed to the track frame 2 with bolts 29. A support shaft 30 is rotatably supported by a pair of bearings 12 provided inside both ends of the support case 28, and a pair of rolling wheels 3 are supported by nuts 31 at both ends of the support shaft 30. It is fixed. A pair of seal members 17 is provided on the side of the roller 3 with respect to the bearing 12 inside both ends of the support case 28.

As shown in FIG. 11, the protrusions 18 shown in FIGS. 2 and 3 are provided at both ends of the support case 28, and the recesses 19 shown in FIGS. 2 and 3 are provided in both the wheels 3. .
In this case, in FIG. 11, the inner recesses 20 shown in FIG. 3 may be provided in both the rolling wheels 3, or the wall members 25 and 26 shown in FIGS. 4 to 9 may be provided in both ends of the support case 28. .

  In FIG. 11, when the wall members 25 and 26 shown in FIGS. 4 to 9 are provided at both ends of the support case 28, the protrusion 18 and the recess 19 are eliminated, and both ends of the support case 28 are turned. It is configured so as to be opposed to the ring 3 with a small gap, or, as in Patent Documents 1 and 2, the labyrinth part of the inlay structure with the convex part and the convex part is rolled with both ends of the support case 28. You may comprise between the ring | wheels 3. In FIG. 11, when the wall members 25 and 26 are provided, the inner concave portion 20 may not be provided.

[Seventh Embodiment of the Invention]
In the above-mentioned [Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Sixth Alternative Embodiment of the Invention], the following configuration may be adopted.
(1) The driving wheel 7 (outer part 7a or inner part 7b), the wheel 3 and the cover member 27 are provided with a convex part 18, and the end part 10a of the axle case 10 and the end part of the support case 28 are provided with a concave part 19.
(2) The driving wheel 7 is formed by integrally forming the outer portion 7a and the inner portion 7b without using the driving wheel 7 as a divided structure of the outer portion 7a and the inner portion 7b.
(3) The end portion 10a of the axle case 10 is not formed into a divided structure, and the end portion 10a is integrally formed with the axle case 10.
(4) The structure shown in FIGS. 2 to 11 is applied not only to the drive wheels 7 and the rolling wheels 3 but also to the guide wheels 4 and the upper rolling wheels 6. In this case, the guide wheel 4 and the upper roller 6 are rotating wheels, and the shaft that rotatably supports the guide wheel 4 and the upper roller 6 is a support shaft.
(5) The convex portions 18 are not formed in a series of continuous rings, but are formed in a ring shape with a part cut away, or a plurality of arc-shaped convex portions are arranged in a circle at predetermined intervals. A single convex portion 18 may be formed.

  The present invention is applicable not only to farm vehicles such as ordinary combiners and self-removable combiners, but also to construction vehicles equipped with crawler travel devices such as backhoes.

3, 7 Rotating wheel 7b, 27 Rotating portion 10, 28 Support case 10a End portion of support case 10c Groove portion at inner peripheral portion of end portion of support case 11, 30 Support shaft 12 Bearing 14 Color member 17 Seal member 17a Seal member 17a Inner annular member 17b Outer annular member of seal member 17c Seal lip member of seal member 17d Clearance of seal member 18 Convex part 19 Concave part 20 Inner concave part 22 Storage groove part 22a First surface part of storage groove part 22b Second surface part of storage groove part 25, 26 Wall member 25b Wall member outer peripheral portion 26a, 26b Wall member ring portion 26d Wall member seal portion P1 Axle of support shaft

Claims (14)

A rotating wheel for traveling, a support shaft that supports the rotating wheel, and a support case that covers the outside of the support shaft;
A bearing is provided between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, and between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, closer to the rotating wheel than the bearing. A sealing member,
One of the end portion on the rotating wheel side of the support case and the rotating portion that rotates integrally with the rotating wheel is provided with a convex portion protruding in the axial direction of the support shaft, and the end portion of the support case, On the other of the rotating parts, a recess formed in a ring shape centering on the axis of the support shaft and opened in the axial direction of the support shaft is provided.
A crawler traveling device that sets the direction and the position of the convex portion and the concave portion so that the convex portion enters the concave portion. A rotating wheel for traveling, a support shaft that supports the rotating wheel, and a support case that covers the outside of the support shaft;
A bearing is provided between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, and between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, closer to the rotating wheel than the bearing. A sealing member,
A crawler traveling device including a ring-shaped wall member between an inner peripheral portion of an end portion of the support case and an outer peripheral portion of the support shaft and closer to the rotating wheel than the seal member. A rotating wheel for traveling, a support shaft that supports the rotating wheel, and a support case that covers the outside of the support shaft;
A bearing is provided between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, and between the outer peripheral portion of the support shaft and the inner peripheral portion of the support case, closer to the rotating wheel than the bearing. A sealing member,
One of the end portion on the rotating wheel side of the support case and the rotating portion that rotates integrally with the rotating wheel is provided with a convex portion protruding in the axial direction of the support shaft, and the end portion of the support case, On the other of the rotating parts, a recess formed in a ring shape centering on the axis of the support shaft and opened in the axial direction of the support shaft is provided.
Set the direction and position of the convex part and the concave part so that the convex part enters the concave part,
A crawler running provided with a ring-shaped wall member between the inner peripheral portion of the end portion of the support case and the outer peripheral portion of the support shaft and between the convex portion and the concave portion and the seal member. apparatus.   The crawler traveling device according to claim 1, wherein the convex portion is formed in a ring shape centering on an axis of the support shaft.   The said convex part is provided in the edge part of the said support case so that it may face the said rotation part, The said recessed part is provided in the said rotation part so that it may face in the edge part of the said support case. The crawler traveling device according to any one of the above.   The crawler traveling device according to claim 2 or 3, wherein an outer peripheral portion of the wall member is in contact with an inner peripheral portion of an end portion of the support case.   The crawler traveling device according to claim 6, wherein an outer peripheral portion of the wall member has a predetermined width along an axial direction of the support shaft and is in contact with an inner peripheral portion of an end portion of the support case.   The crawler traveling device according to claim 6 or 7, wherein the wall member is configured by a flexible member.   The crawler traveling device according to claim 8, further comprising a groove portion into which an outer peripheral portion of the wall member enters in an inner peripheral portion of an end portion of the support case.   The wall member is a non-flexible seal portion positioned between a flexible seal portion that contacts an end portion of the support case, and an inner peripheral portion of the end portion of the support case and an outer peripheral portion of the support shaft. The crawler traveling device according to claim 6 or 7, comprising a ring portion. The seal member includes an inner annular member, an outer annular member, and a seal lip member between the inner annular member and the outer annular member,
The gap between the convex portion and the concave portion between the inner annular member and the outer annular member is located on the inner peripheral side of the end portion of the support case in the radial direction of the seal member. The crawler traveling apparatus as described in any one of -10.   The rotation part which rotates integrally with the said rotating wheel is provided with the inner side recessed part opened toward the said seal member in the part between the said convex part and the said recessed part, and the outer peripheral part of the said support shaft. The crawler travel device according to any one of 11.   The crawler traveling device according to claim 12, wherein the inner concave portion is configured in a ring shape centering on an axis of the support shaft. The position of the rotating portion is determined by contacting the rotating portion that rotates integrally with the rotating wheel between the inner peripheral portion of the seal member and the outer peripheral portion of the support shaft, and the sealing member is moved by the rotating portion. It has a collar member that prevents being pressed,
At the contact portion between the rotating portion and the collar member, an O-ring is provided at an end portion on the collar member side in an inner peripheral portion of the rotating portion or an end portion on the rotating portion side in an inner peripheral portion of the collar member. With a storage groove for storage,
The storage groove portion includes a ring-shaped first surface portion parallel to a radial direction centered on the axis of the support shaft, and a ring-shaped second surface portion along the axis direction of the support shaft. The crawler traveling device according to any one of claims 1 to 13.

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