JP2021030942A - Crawler type traveling device of working machine and method of manufacturing the same - Google Patents

Abstract

To provide a crawler type traveling device capable of suppressing the loosening of a bolt screwed to a motor flange portion and the deterioration of strength of the motor flange portion near a screw hole, by suppressing the wear of the motor flange portion of a fixed casing.SOLUTION: A crawler type traveling device 1 is equipped with a protection member 80 disposed on the outer side in a radial direction with respect to a motor flange portion 13 of a fixed casing 10 and is fixed to a bracket 32. The protection member 80 is configured to extend in a circumferential direction along an outer peripheral surface of the motor flange portion 13 so as to surround at least an outside part 13A that is a part positioned on the outer side in a vehicle fore-and-aft direction with respect to a vertical surface including a center axis of rotations of a traveling motor, of the motor flange portion 13, and to project to the outer side in a vehicle width direction from the bracket 32 to a position on the outer side in the vehicle width direction with respect to at least a screw hole formed on the outside part 13A, of the plurality of screw holes formed on the motor flange portion 13.SELECTED DRAWING: Figure 5

Description

The present invention relates to a crawler type traveling device mounted on a work machine and a method for manufacturing the same.

Conventionally, a crawler type traveling device mounted on a work machine such as a hydraulic excavator is known. For example, the crawler type traveling device disclosed in Patent Document 1 is fixed to a crawler frame extending in the front-rear direction of the vehicle, a bracket forming one end of the crawler frame, and a fixed casing for accommodating a traveling motor, and the fixed casing. It includes a rotating casing that is arranged adjacent to each other and rotates by the rotational force of the traveling motor, and a sprocket (wheel) that is fixed to the rotating casing. In the traveling device of Patent Document 1, a protective plate is attached to the rotating casing. This protective plate suppresses the contact of earth and sand with the rotating casing that rotates during traveling, and suppresses the wear of the rotating casing (paragraph 0032 of Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-201356

As described above, in the conventional traveling device, measures against wear of the rotating casing, which is a rotating member, have been taken, but no consideration is given to wear of a member that does not rotate even during traveling, such as a fixed casing. There wasn't.

However, in work performed at a work site containing a large amount of rocks and stones such as a crushed stone site, the rocks and stones frequently come into contact with not only the rotating casing but also the fixed casing when the traveling device travels. To do. The load applied to the fixed casing by the contact of the rocks and stones is larger than the load applied to the fixed casing by the contact of the earth and sand. Therefore, if the cumulative time of the work at the crushed stone site becomes long, wear may progress even in the fixed casing.

Here, the fixed casing has a flange portion (motor flange portion) for fixing the fixed casing to the bracket of the crawler frame. The motor flange portion has a plurality of screw holes arranged at intervals along the circumferential direction, and a plurality of bolts are screwed into the plurality of screw holes to form the bracket of the crawler frame. It is fixed. For this reason, among the fixed casings, in particular, when the motor flange portion is worn, there is a problem that the bolt is easily loosened and a problem that the strength of the motor flange portion in the vicinity of the screw hole is lowered. ..

The present invention has been made to solve the above problems, and by suppressing wear of the motor flange portion of the fixed casing, loosening of a bolt screwed into the motor flange portion and the above in the vicinity of a screw hole. An object of the present invention is to provide a crawler type traveling device for a work machine capable of suppressing a decrease in the strength of a motor flange portion and a method for manufacturing the same.

Provided are a crawler type traveling device mounted on a work machine, from a motor accommodating portion accommodating a traveling motor that generates a rotational force around a central axis facing the vehicle width direction and the motor accommodating portion. A fixed casing having a motor flange portion extending outward in the radial direction orthogonal to the central axis, and a rotary casing adjacent to the outside in the vehicle width direction with respect to the fixed casing and rotating by the rotational force of the traveling motor. A crawler frame extending in the vehicle front-rear direction, which has a bracket constituting one end of the crawler frame in the vehicle front-rear direction, and the bracket is inside the motor flange portion in the vehicle width direction. A crawler frame including a bracket flange portion facing the vehicle width direction with respect to the motor flange portion, a plurality of flange fixing bolts for fixing the motor flange portion to the bracket flange portion, and fixing to the rotary casing. It is bridged between the first wheel, the second wheel rotatably supported by the other end of the crawler frame in the vehicle front-rear direction, and the first wheel and the second wheel. A crawler belt and a protective member arranged outside the motor flange portion in the radial direction and fixed to the bracket are provided, and the bracket flange portions are formed at intervals in the circumferential direction thereof. The motor flange portion has a plurality of screw holes formed at a portion corresponding to the plurality of bolt insertion holes, and the plurality of flange fixing bolts have the plurality of bolts. Each of the protective members is inserted into the insertion holes and screwed into the plurality of screw holes, and the protective member is circumferentially along the outer peripheral surface of the motor flange portion so as to surround at least the outer portion of the motor flange portion. The outer portion is formed so as to extend, and the outer portion is a portion of the motor flange portion located outside the vertical surface including the central axis in the vehicle front-rear direction, and the protective member is formed by the plurality of screw holes. Of these, the bracket is configured to project outward from the bracket in the vehicle width direction to at least a position outside the vehicle width direction from the screw hole formed in the outer portion.

In the crawler type traveling device of this work machine, the outer portion of the motor flange portion can be effectively protected by the protective member. Specifically, it is as follows. Since the outer portion is a portion of the motor flange portion located outside the vertical plane including the central axis in the vehicle front-rear direction, the outer portion is close to the crawler belt. Therefore, rocks and stones are likely to stay in the space between the outer portion and the crawler belt when the traveling device travels at a work site such as a crushed stone site. Moreover, when the rocks and stones staying in the space move while contacting the outer portion as the rotating casing and the crawler belt adjacent to the outer portion rotate, a large load is applied to the outer portion. Wear of the outer portion is likely to proceed. On the other hand, the protective member is configured to extend along the outer peripheral surface of the motor flange portion so as to surround at least the outer portion. This makes it possible to reduce the frequency with which the rocks and stones collide with the outer portion of the motor flange portion. Further, the protective member projects from the bracket to the outside in the vehicle width direction to a position outside the vehicle width direction at least from the screw holes formed in the outer portion of the plurality of screw holes. It is configured. This makes it possible to effectively suppress the wear of the motor flange portion in the vicinity of the screw hole formed in the outer portion. Moreover, since both the protective member and the fixed casing are fixed to the bracket, the relative positions of the protective member and the motor flange portion of the fixed casing do not change even if the traveling motor rotates. This makes it possible to suppress the progress of wear of the motor flange portion due to the stone even when the stone enters between the protective member and the motor flange portion. Therefore, the crawler type traveling device can suppress loosening of the flange fixing bolt screwed into the motor flange portion and a decrease in strength of the motor flange portion in the vicinity of the screw hole.

In the crawler type traveling device of the work machine, the protective member extends in the circumferential direction so as to surround the entire circumference of the motor flange portion, and extends to a position outside the vehicle width direction from the plurality of screw holes. It is preferable that the bracket is configured so as to project outward in the vehicle width direction.

In this aspect, it is possible to reduce the frequency of collision of the rock or stone with the motor flange portion on the entire circumference of the motor flange portion including not only the outer portion but also a portion other than the outer portion. Further, it is possible to effectively suppress the wear of the motor flange portion in the vicinity of each of all the screw holes formed in the motor flange portion.

It is preferable that the crawler type traveling device of the work machine further includes at least one fixing member that detachably fixes the protective member to the bracket.

In this embodiment, when the protective member is worn out, it is not necessary to replace the entire bracket to which the protective member is fixed or the entire crawler frame including the bracket with another new one, and the protection is provided. Only the member need to be replaced with another new protective member.

In the crawler type traveling device of the work machine, the at least one fixing member includes a plurality of protective member fixing bolts, and the plurality of protective member fixing bolts are arranged at intervals in the circumferential direction. It is preferable that each of the protective member fixing bolts of the above is configured such that the shaft portion thereof faces the vehicle width direction, penetrates the bracket, and is screwed into the protective member.

In this aspect, the work of attaching and removing the plurality of protective member fixing bolts to the protective member and the work of attaching and removing the plurality of flange fixing bolts to the motor flange portion of the fixing casing are performed in the same direction. That is, since it can be performed from the vehicle width direction, workability is improved.

In the crawler type traveling device of the work machine, the rotating casing is an inner side surface facing inward in the vehicle width direction and continuous in an annular shape in the circumferential direction, and the inner side surface in the radial direction on the inner side surface. It has an outer peripheral surface that projects inward in the vehicle width direction from the inner peripheral edge and faces the outer side in the radial direction and is continuous in an annular shape in the circumferential direction. An end face that is adjacent to the inner surface with a gap in the vehicle width direction and is continuous in an annular or arc shape, and from the inner peripheral edge of the end face on the inner side in the radial direction to the inner side in the vehicle width direction. An inner peripheral surface that overhangs and is adjacent to the outer peripheral surface of the rotating casing with a gap in the radial direction and has an annular or arcuate continuous inner peripheral surface, and the outer peripheral surface of the rotating casing. It is preferable that a floating seal mechanism for sealing the gap between the fixed casing and the rotating casing is provided inside the radial direction.

The protective member according to this aspect forms a so-called labyrinth structure by having the end surface and the inner peripheral surface adjacent to the inner side surface and the outer peripheral surface of the rotating casing with a gap, respectively. It also has a function of suppressing the progress of wear of the motor flange portion and a function of suppressing foreign matter such as earth and sand from entering the floating seal mechanism. This makes it possible to suppress the progress of wear of the motor flange portion while suppressing an increase in the number of parts, and also to prevent foreign matter such as earth and sand from entering the floating seal mechanism.

In the crawler type traveling device of the work machine, the fixed casing is allowed to move relative to the bracket and the protective member in the vehicle width direction between the protective member and the motor flange portion. It is preferable that a radial gap is formed.

In this embodiment, the plurality of flange fixing bolts are removed from the plurality of screw holes in the motor flange portion so that the fixing casing is relatively moved in the vehicle width direction with respect to the bracket and the protection member. it can. As a result, maintenance of the crawler type traveling device can be easily performed. Further, this aspect makes it possible to manufacture the crawler type traveling device by the following manufacturing method.

The method of manufacturing the crawler type traveling device of the provided work machine includes a step of preparing the fixed casing, the crawler frame, the plurality of flange fixing bolts and the protective member, and the protective member on the bracket of the crawler frame. By moving the fixed casing relative to the bracket and the protective member in the vehicle width direction, the motor flange portion of the fixed casing is moved to the vehicle width with respect to the bracket flange portion of the bracket. The step of arranging the motor flange portion of the fixed casing inside the protective member in the radial direction while arranging the motor flange portion adjacent to the direction, and the motor flange portion of the bracket flange portion by the plurality of flange fixing bolts. Including the step of fixing.

In this manufacturing method, since the protective member is fixed to the bracket of the crawler frame, a structure in which a gap is formed between the protective member and the motor flange portion can be easily adopted. As a result, the fixed casing can be moved relative to the bracket and the protective member in the vehicle width direction while the protective member is fixed to the bracket, and can be moved inside the protective member in the radial direction. With the motor flange portion arranged, the motor flange portion can be fixed to the bracket flange portion by the plurality of flange fixing bolts. In this way, the protective member can be arranged around the motor flange portion without any inconvenience.

As described above, according to the present invention, by suppressing the wear of the motor flange portion of the fixed casing, the loosening of the plurality of bolts screwed into the motor flange portion and the motor flange portion in the vicinity of the plurality of screw holes. It is possible to suppress a decrease in the strength of the.

It is a side view which shows the hydraulic excavator which is an example of the work machine which mounts the crawler type traveling device which concerns on embodiment of this invention. It is a top view which shows the base frame of the hydraulic excavator of FIG. 1 and a pair of crawler frames. It is a side view which shows the base frame and the crawler frame of the hydraulic excavator of FIG. It is sectional drawing of the partial break in the IV-IV line of FIG. FIG. 4 is a cross-sectional view of a region surrounded by an alternate long and short dash line in FIG. It is the schematic for demonstrating the positional relationship between the motor flange of the fixed casing of the crawler type traveling device, and the protection member. It is a schematic diagram for demonstrating the positional relationship between the motor flange of the fixed casing of the crawler type traveling device which concerns on modification 1 of the said Embodiment, and a protection member. It is a schematic diagram for demonstrating the positional relationship between the motor flange of the fixed casing of the crawler type traveling device which concerns on modification 2 of the said Embodiment, and a protective member. It is sectional drawing of the main part in the crawler type traveling apparatus which concerns on modification 3 of the said embodiment. It is sectional drawing of the main part in the crawler type traveling apparatus which concerns on modification 4 of the said embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Overall structure of work machine]
FIG. 1 is a side view showing a hydraulic excavator 100 which is an example of a work machine on which the crawler type traveling device according to the embodiment is mounted. FIG. 2 is a plan view showing a base frame of the hydraulic excavator 100 of FIG. 1 and a pair of crawler frames. FIG. 3 is a side view showing the base frame and the crawler frame of the hydraulic excavator of FIG. FIG. 4 is a cross-sectional view of a partial break in line IV-IV of FIG. FIG. 5 is a cross-sectional view of the region surrounded by the alternate long and short dash line in FIG. The directions of "top", "bottom", "front", "rear", "left", and "right" shown in the drawings are shown for convenience to explain the crawler type traveling device according to the embodiment. It does not limit the moving direction and usage mode of the work machine.

The hydraulic excavator 100 shown in FIG. 1 includes a lower traveling body 101, an upper swivel body 102 rotatably mounted on the lower traveling body 101, and a working device 106 mounted on the upper swivel body 102. The upper swivel body 102 has a swivel frame 102a connected to the lower traveling body 101 and a cab 107 mounted on the swivel frame 102a. The working device 106 is rotatably connected to a boom 103 that is undulatingly connected to the front end of the swivel frame 102a (the right front end in the example shown in FIG. 1) and to the tip of the boom 103. It includes an arm 104 and a bucket 105 that is rotatably connected to the tip of the arm 104.

The lower traveling body 101 includes a pair of left and right crawler type traveling devices 1, 1 and a base frame 108 connecting the pair of crawler type traveling devices 1, 1 and a swivel bearing 101B supported by the base frame 108. Be prepared.

The base frame 108 connects the crawler frames 30 and 30, which will be described later, of the pair of crawler type traveling devices 1 and 1. The upper swivel body 102 is attached to the swivel bearing 101B.

[Structure of crawler type traveling device]
In FIG. 1, of the pair of crawler type traveling devices 1 and 1, only the left side crawler type traveling device 1 is shown. The pair of crawler type traveling devices 1 and 1 have the same structure except that the arrangement of the plurality of constituent members is reversed left and right. Therefore, in the following, mainly one of the pair of crawler type traveling devices 1 and 1 will be described. In the following, the crawler type traveling device 1 is simply referred to as a traveling device 1.

As shown in FIG. 2, the left-right direction is the vehicle width direction of the lower traveling body 101. In the traveling device 1 on the right side, the inside in the vehicle width direction is the left side, and the outside is the right side. In the traveling device 1 on the left side, the inside in the vehicle width direction is the right side, and the outside is the left side.

The traveling device 1 includes a fixed casing 10, a rotating casing 20, a crawler frame 30, a plurality of flange fixing bolts 40, a drive tumbler 50 (an example of a first wheel), and an idler 60 (of a second wheel). An example), a crawler belt 70, and a protective member 80 are provided.

The crawler frame 30 has a shape extending in the front-rear direction. The crawler frame 30 is connected to a frame main body 31 extending in the front-rear direction and one end (rear end in FIG. 1) of the frame main body 31, and one end of the crawler frame 30 (rear end in FIG. 1). ), And the idler bracket 39 which is connected to the other end (front end in FIG. 1) of the frame body 31 and constitutes the other end (front end in FIG. 1) of the crawler frame 30. , Have.

The tumbler bracket 32 rotatably supports the drive tumbler 50 via the fixed casing 10 and the rotary casing 20. The idler bracket 39 rotatably supports the idler 60.

As shown in FIGS. 3 and 4, the tumbler bracket 32 includes a bracket main body 33 and a bracket flange 34. The bracket main body 33 surrounds at least a part of the periphery of the motor accommodating portion 12, which will be described later.

The bracket flange portion 33 is a portion of the bracket main body portion 33 that projects inward in the radial direction from an outer end portion in the vehicle width direction (left-right direction). The bracket flange portion 33 is a portion having an annular shape as shown in FIG. The bracket flange portion 33 has a plurality of bolt insertion holes 35 formed at intervals in the circumferential direction thereof. The bracket flange portion 33 faces the motor flange portion 13 in the vehicle width direction inside the motor flange portion 13 described later in the vehicle width direction.

As shown in FIGS. 4 and 5, the fixed casing 10 includes a motor accommodating portion 12 accommodating a hydraulic traveling motor 11 that generates a rotational force around a central axis A facing in the vehicle width direction, and the motor accommodating portion 12. It has a motor flange portion 13 projecting outward from the portion 12 in the radial direction orthogonal to the central axis A. The motor accommodating portion 12 is a portion having a cylindrical shape having a bottom portion inside in the vehicle width direction, and the motor flange portion 13 is a radial direction from the outer end portion in the motor accommodating portion 12 in the vehicle width direction. It is a part having an annular shape extending to the outside of the. The motor flange portion 13 has a plurality of screw holes 14 formed in portions corresponding to the plurality of bolt insertion holes 35 of the bracket flange portion 34.

The rotary casing 20 is adjacent to the fixed casing 10 on the outer side in the vehicle width direction, and reduces the rotational force of the traveling motor 11 and transmits it to the drive tumbler 50. The rotary casing 20 has a speed reducer accommodating portion 22 in which a speed reducer 21 for decelerating the rotation of the traveling motor 11 is housed, and a flange portion 23 projecting outward from the speed reducer accommodating portion 22 in the radial direction. .. The speed reducer accommodating portion 22 is a portion having a cylindrical shape having a bottom portion on the outside in the vehicle width direction, and the flange portion 23 has a diameter from the inner end portion in the speed reducer accommodating portion 22 in the vehicle width direction. It is a part having an annular shape that extends outward in the direction. The flange portion 23 has a plurality of screw holes formed at intervals in the circumferential direction in order to screw bolts for fixing the drive tumbler 50 to the flange portion 23.

The plurality of flange fixing bolts 40 fix the motor flange portion 13 to the bracket flange portion 34. Specifically, the plurality of flange fixing bolts 40 are inserted into the plurality of bolt insertion holes 35 of the bracket flange portion 34, and are screwed into the plurality of screw holes 14 of the motor flange portion 13. As a result, the motor flange portion 13 is fixed to the bracket flange portion 34. The head 40A of each of the plurality of flange fixing bolts 40 is arranged inside the bracket flange portion 34 in the vehicle width direction, and the shaft portion 40B is arranged from the head 40A in a posture facing the vehicle width direction. Is also arranged outside in the vehicle width direction.

The tumbler bracket 50 has a plurality of bolt insertion holes formed in portions of the flange portion 23 corresponding to the plurality of screw holes, and the bolts are inserted into the plurality of bolt insertion holes, and the bolts are the flanges. By being screwed into the screw hole of the portion 23, it is fixed to the rotating casing 20.

The crawler belt 70 is configured by connecting a large number of shoes. The crawler belt is an endless belt that is bridged between the drive tumbler 50 and the idler 60 in a ring shape. A plurality of tooth portions are formed on the outer peripheral portion of the drive tumbler 50 so as to mesh with the crawler belt 70. When the drive tumbler 50 is rotated by the rotational force of the traveling motor 11, the crawler belt 70 circulates in the direction corresponding to the rotation direction of the drive tumbler 60, and the traveling device 1 moves forward or backward.

As shown in FIG. 5, in the traveling device 1, since the rotating casing 20 rotates relative to the fixed casing 10 via the bearing 131, the rotating casing 20 is arranged with a gap G with respect to the fixed casing 10. ing. The radial outer opening 140 in the gap G between the rotating casing 20 and the fixed casing 10 is open to the outside of these casings 10 and 20. Therefore, foreign matter such as earth and sand may enter the gap G from the opening. Therefore, the rotating casing 20 and the fixed casing 10 have a labyrinth structure 130 that makes it difficult for foreign matter that has entered the gap G to move inward in the radial direction. In the labyrinth structure 130, the gap G is not provided linearly in the radial direction but is provided in a polygonal line in the cross-sectional view shown in FIG. As a result, it becomes difficult for foreign matter that has entered the gap G from the radial outer opening 140 in the gap G to reach the floating seal mechanism 120.

The floating seal mechanism 120 is arranged at an inner opening in the radial direction in the gap G between the fixed casing 10 and the rotary casing 20. The floating seal mechanism 120 is an annular member arranged along the opening so as to close the opening on the inner side in the radial direction in the gap G. The floating seal mechanism 120 has a function of preventing leakage of oil contained in the space between the fixed casing 10 and the rotary casing 20, and a function of preventing foreign matter from entering the space.

The floating seal mechanism 120 has a pair of annular seal rings 121 and a pair of O-rings 122. One seal ring 121 presses one O-ring 122 against the inner peripheral surface of the rotating casing 20, and the other seal ring 121 presses the other O-ring 122 against the inner peripheral surface of the fixed casing 10. The pair of seal rings 121 are slidably adhered to each other, and when the rotary casing 20 rotates, the seal ring 121 attached to the rotary casing 20 is attached to the fixed casing 10. It rotates while being in close contact with the.

[Protective member]
The protective member 80 is a member for effectively protecting the motor flange portion 13 from a load during traveling.

FIG. 6 is a schematic view for explaining the positional relationship between the motor flange portion 13 of the fixed casing 10 and the protective member 80. As shown in FIGS. 4, 5 and 6, the protective member 80 is arranged outside the motor flange portion 13 in the radial direction. In the specific example shown in FIG. 6, the protective member 80 is a member having a cylindrical shape. That is, the protective member 80 is arranged so as to surround the entire outer peripheral surface of the motor flange portion 13.

As shown in FIG. 5, the protective member 80 extends from the bracket flange portion 34 of the tumbler bracket 32 to a position outside the vehicle width direction from all the screw holes 14 formed in the motor flange portion 13. It is configured to project outward in the vehicle width direction. That is, the outer end surface 81 of the protective member 80 in the vehicle width direction is located outside the vehicle width direction of the motor flange portion 13, and the tip of each shaft portion 40B of the plurality of flange fixing bolts 40. It is located outside the vehicle width direction. Further, in the specific example shown in FIG. 5, the end surface 81 of the protective member 80 is outside the opening 140 in the radial direction in the gap G between the rotating casing 20 and the fixed casing 10 in the vehicle width direction. Is located in.

However, the position of the end face 81 of the protective member 80 is not limited to the above specific example. The end face 81 of the protective member 80 may be located at least outside the screw hole 14 in the vehicle width direction.

The protective member 80 is joined to the bracket flange portion 34 of the tumbler bracket 32 (specifically, the tumbler bracket 32) so that the protective member 80 is joined to the tumbler bracket 32 (specifically, the tumbler bracket 32). The method of joining the protective member 80 to the tumbler bracket 32 is not particularly limited, but in the specific example shown in FIG. 6, welding is adopted.

FIG. 7 is a schematic view for explaining the positional relationship between the motor flange portion 13 of the fixed casing 10 of the traveling device 1 and the protective member 80 according to the first modification of the embodiment. FIG. 8 is a schematic view for explaining the positional relationship between the motor flange portion 13 of the fixed casing 10 of the traveling device 1 and the protective member 80 according to the second modification of the embodiment.

In the modified examples 1 and 2 shown in FIGS. 7 and 8, the protective member 80 may be arranged so as to surround the entire outer peripheral surface of the motor flange portion 13 like the protective member 80 shown in FIG. It is arranged so as to surround a part of the outer peripheral surface of the motor flange portion 13.

In the modified examples 1 and 2 shown in FIGS. 7 and 8, the protective member 80 is circumferentially along the outer peripheral surface of the motor flange portion 13 so as to surround at least the outer portion 13A of the motor flange portion 13. It is configured to extend. The outer portion 13A is a portion of the motor flange portion 13 located outside the vertical plane V including the central axis A in the vehicle front-rear direction. In FIGS. 7 and 8, the outside of the vehicle in the front-rear direction is the rear side. Therefore, in the modified example, when the protective member 80 is cut in a plane orthogonal to the central axis A, the cross section has an arc shape. The protective member 80 according to the modified example shown in FIGS. 7 and 8 is provided in the range indicated by the arcuate arrow in FIGS. 7 and 8, respectively. The modified example 1 shown in FIG. 7 illustrates the case where the central angle of the arc is 180 degrees, and the modified example 2 shown in FIG. 8 illustrates the case where the central angle of the arc is larger than 180 degrees. .. In the second modification, in the side view shown in FIG. 8, the upper end portion of the protective member 80 is located inside the outer region 13A in the vehicle front-rear direction (front side in FIG. 8), and the protective member 80 The lower end is located inside the vehicle in the front-rear direction (front side in FIG. 8) with respect to the outer region 13A.

The protective member 80 extends from the tumbler bracket 32 to the outside of the plurality of screw holes 14 in the vehicle width direction to at least a position outside the screw holes 14 formed in the outer portion 13A in the vehicle width direction. It is configured to protrude.

FIG. 9 is a cross-sectional view of a main part of the crawler type traveling device according to the third modification of the embodiment.

In the modified example 3 shown in FIG. 9, the rotating casing 20 has a first inner surface 201, a second outer peripheral surface 202, a second inner surface 203, and a second outer peripheral surface 204. The first inner side surface 201 is a surface that faces inward in the vehicle width direction and is continuous in an annular shape in the circumferential direction. The first outer peripheral surface 202 is a surface of the first inner surface 201 that projects inward in the vehicle width direction from the inner inner peripheral edge in the radial direction and faces the outer side in the radial direction, and is circular in the circumferential direction. It is continuous in a ring. The second inner surface 203 is a surface of the first outer peripheral surface 202 that projects inward in the radial direction from the inner peripheral edge in the vehicle width direction and faces inward in the vehicle width direction, and is a circle in the circumferential direction. It is continuous in a ring. The second outer peripheral surface 204 is a surface of the second inner surface 203 that projects inward in the vehicle width direction from the inner inner peripheral edge in the radial direction and faces the outer side in the radial direction, and is circular in the circumferential direction. It is continuous in a ring.

The protective member 80 has a first outer surface 81 composed of the end surface 81, a first inner peripheral surface 82, a second outer surface 83, and a second inner peripheral surface 84. The first outer surface 81 (end surface 81) is an end surface adjacent to the first inner surface 201 of the rotary casing 20 with a gap in the vehicle width direction and is continuous in an annular shape. .. The first inner peripheral surface 82 projects from the inner inner peripheral edge of the first outer surface 81 in the radial direction to the inside in the vehicle width direction with respect to the first outer peripheral surface 202 of the rotating casing 20. It is a surface adjacent to each other with a gap in the radial direction, and is continuous in an annular shape. The second outer surface 83 projects inward in the radial direction from the inner peripheral edge in the vehicle width direction of the first inner peripheral surface 82 with respect to the first inner surface 203 of the rotating casing 20. The surfaces are adjacent to each other with a gap in the vehicle width direction, and are continuous in an annular shape in the circumferential direction. The second inner peripheral surface 84 projects from the inner inner peripheral edge of the second outer surface 83 in the radial direction to the inside in the vehicle width direction with respect to the second outer peripheral surface 204 of the rotating casing 20. The surfaces are adjacent to each other with a gap in the radial direction, and are continuous in an annular shape in the circumferential direction.

As described above, the gap between the fixed casing 10 and the rotary casing 20 is sealed inside the rotary casing 20 in the radial direction with respect to the first and second outer peripheral surfaces 202 and 204. A floating seal mechanism 120 is provided.

In the third modification, the protective member 80 has the outer surfaces 81, 83 and the inner circumference adjacent to the inner surfaces 201, 203 and the outer peripheral surfaces 202, 204 of the rotating casing 20, respectively, with a gap. By having the surfaces 82 and 84, a second labyrinth structure 150 is further formed on the outer side in the radial direction of the labyrinth structure 130. As a result, the protective member 80 has both a function of suppressing the progress of wear of the motor flange portion 13 and a function of suppressing foreign matter such as earth and sand from entering the floating seal mechanism 120. This makes it possible to suppress the progress of wear of the motor flange portion 13 while suppressing an increase in the number of parts, and further suppress the entry of foreign matter such as earth and sand into the floating seal mechanism 120. it can.

FIG. 10 is a cross-sectional view of a main part of the crawler type traveling device according to the modified example 4 of the embodiment.

In the modified example 4 shown in FIG. 10, the traveling device 1 further includes a plurality of fixing members 90 that detachably fix the protective member 80 to the tumbler bracket 32. In the fourth modification, when the protective member 80 is worn out, the entire tumbler bracket 32 to which the protective member 80 is fixed or the entire crawler frame 30 including the tumbler bracket 32 is replaced with a new one. It is not necessary to replace only the protective member 80 with another new protective member 80.

The plurality of fixing members 90 are composed of a plurality of protective member fixing bolts 91. The plurality of protective member fixing bolts 91 are arranged at intervals in the circumferential direction. The head 91A of each of the plurality of protective member fixing bolts 91 is located inside the bracket flange portion 34 in the vehicle width direction, and the shaft portion 91B faces the vehicle width direction. It penetrates the bolt insertion hole 36 of the bracket 32 and is screwed into the screw hole 85 of the protective member 80.

In the fourth modification, the work of attaching and removing the plurality of protective member fixing bolts 91 to the protective member 80, and the work of attaching and removing the plurality of flange fixing bolts 40 to the motor flange portion 13 of the fixing casing 10. Since the work can be performed from the same direction, that is, from the inside in the vehicle width direction, workability is improved.

As described above, in the embodiment and its modification, at least the outer portion 13A of the motor flange portion 13 can be effectively protected by the protective member 80. Specifically, it is as follows.

Since the outer portion 13A is a portion of the motor flange portion 13 located on the outer side (rear side in FIGS. 6 to 8) of the motor flange portion 13 in the vehicle front-rear direction with respect to the vertical plane V including the central axis A, the crawler. It is close to the belt 70. Therefore, rocks and stones are likely to stay in the space between the outer portion 13A and the crawler belt 70 when the traveling device 1 travels at a work site such as a crushed stone site. Moreover, when the rocks and stones staying in the space move while contacting the outer portion 13A as the rotating casing 20 and the crawler belt 70 adjacent to the outer portion 13A rotate, the outer portion 13A is reached. A large load is applied, and the outer portion 13A is easily worn.

On the other hand, the protective member 80 is configured to extend along the outer peripheral surface of the motor flange portion 13 so as to surround at least the outer portion 13A. This makes it possible to reduce the frequency of collision of the rock or stone with the outer portion 13A of the motor flange portion 13. Further, the protective member 80 is located in the vehicle width direction from the tumbler bracket 32 to a position outside the vehicle width direction at least from the screw holes 14 formed in the outer portion 13A of the plurality of screw holes 14. It is configured to project outward. This makes it possible to effectively suppress the wear of the motor flange portion 13 in the vicinity of the screw hole 14 formed in the outer portion 13A.

Moreover, since the protective member 80 and the fixed casing 10 are both fixed to the tumbler bracket 32, even if the traveling motor 11 rotates, the protective member 80 and the motor flange portion 13 of the fixed casing 10 are used. The relative position with and does not change. This makes it possible to suppress the progress of wear of the motor flange portion 13 due to the stone even when the stone enters between the protective member 80 and the motor flange portion 13.

Therefore, the traveling device 1 can suppress the loosening of the flange fixing bolt 40 screwed into the motor flange portion 13 and the decrease in the strength of the motor flange portion 13 in the vicinity of the screw hole 14.

The protective member 80 shown in FIG. 6 extends in the circumferential direction so as to surround the entire circumference of the motor flange portion 13, and the tumbler bracket 32 extends to a position outside the plurality of screw holes 14 in the vehicle width direction. It is configured to project outward from the vehicle width direction. In this aspect, the frequency of collision of the rock or stone with the motor flange portion 13 is reduced on the entire circumference of the motor flange portion 13 including not only the outer portion 13A but also a portion other than the outer portion 13A. Can be done. Further, it is possible to effectively suppress the wear of the motor flange portion 13 in the vicinity of each of all the screw holes 14 formed in the motor flange portion 13.

As shown in FIGS. 5 and 6, the fixed casing 10 moves relative to the tumbler bracket 32 and the protective member 80 in the vehicle width direction between the protective member 80 and the motor flange portion 13. The radial gap S is formed. In this embodiment, the plurality of flange fixing bolts 40 are removed from the plurality of screw holes 14 of the motor flange portion 13, so that the fixing casing 10 is placed in the vehicle width with respect to the tumbler bracket 32 and the protective member 80. It can be moved relative to the direction. As a result, maintenance of the crawler type traveling device 1 can be easily performed. Further, this aspect makes it possible to manufacture the crawler type traveling device 1 by the following manufacturing method.

[Manufacturing method of traveling device]
The manufacturing method of the traveling device 1 includes a preparation step, a protective member fixing step, an arrangement step, and a flange fixing step.

In the preparatory step, the fixed casing 10, the crawler frame 30, the plurality of flange fixing bolts 40, the protective member 80, and other members constituting the traveling device 1 are prepared.

In the protective member fixing step, the protective member 80 is fixed to the tumbler bracket 32 of the crawler frame 30.

In the arrangement step, the fixed casing 10 is relatively moved in the vehicle width direction with respect to the tumbler bracket 32 and the protective member 80, so that the motor flange portion 13 of the fixed casing 10 is the tumbler bracket 32. The motor flange portion 13 of the fixed casing 10 is arranged inside the protective member 80 in the radial direction so as to be adjacent to the bracket flange portion 34 in the vehicle width direction.

In the flange fixing step, the motor flange portion 13 is fixed to the bracket flange portion 34 by the plurality of flange fixing bolts 40.

In this manufacturing method, since the protective member 80 is fixed to the tumbler bracket 32 of the crawler frame 30, a structure in which a gap is formed between the protective member 80 and the motor flange portion 13 is easily adopted. can do. As a result, the fixed casing 10 can be moved relative to the tumbler bracket 32 and the protective member 80 in the vehicle width direction while the protective member 80 is fixed to the tumbler bracket 32, and the protective member The motor flange portion 13 can be fixed to the bracket flange portion 34 by the plurality of flange fixing bolts 40 in a state where the motor flange portion 13 is arranged inside the radial direction of the 80. In this way, the protective member 80 can be arranged around the motor flange portion 13 without any inconvenience.

[Modification example]
The present invention is not limited to the embodiments described above. The present invention includes, for example, the following aspects.

The work machine to which the traveling device according to the present invention is applied is not limited to the hydraulic excavator. The present invention can be applied to various work machines equipped with traveling devices including crawlers, such as cranes, wheel loaders, bulldozers, graders and the like. Further, the traveling device according to the present invention can be widely applied to a self-propelled machine other than the working machine. Further, the traveling device according to the present invention may be a traveling device other than the crawler type traveling device.

1 Crawler type traveling device 10 Fixed casing 11 Traveling motor 12 Motor housing 13 Motor flange 13A Outer portion 14 Screw hole 20 Rotating casing 30 Crawler frame 31 Frame body 32 Tumble bracket (one end of crawler frame)
33 Bracket body 34 Bracket flange 39 Idler bracket (the other end of the crawler frame)
40 Flange fixing bolt 50 Drive tumbler (an example of the first wheel)
60 idler (an example of the second wheel)
70 Crawler belt 80 Protective member 100 Hydraulic excavator (example of work machine)
120 Floating seal mechanism

Claims (7)

It is a crawler type traveling device mounted on a work machine.
A fixed casing having a motor accommodating portion for accommodating a traveling motor that generates a rotational force around a central axis facing in the vehicle width direction and a motor flange portion extending outward in the radial direction orthogonal to the central axis from the motor accommodating portion. When,
A rotating casing that is adjacent to the outside of the fixed casing in the vehicle width direction and is rotated by the rotational force of the traveling motor.
A crawler frame extending in the vehicle front-rear direction, which has a bracket constituting one end of the crawler frame in the vehicle front-rear direction, and the bracket is inside the motor flange portion in the vehicle width direction. A crawler frame including a bracket flange portion facing the motor flange portion in the vehicle width direction, and a crawler frame.
A plurality of flange fixing bolts for fixing the motor flange portion to the bracket flange portion,
The first wheel fixed to the rotating casing and
A second wheel rotatably supported at the other end of the crawler frame in the vehicle front-rear direction.
A crawler belt bridged between the first wheel and the second wheel,
A protective member that is arranged on the outer side in the radial direction with respect to the motor flange portion and is fixed to the bracket is provided.
The bracket flange portion has a plurality of bolt insertion holes formed at intervals in the circumferential direction thereof, and the motor flange portion has a plurality of screws formed at a portion corresponding to the plurality of bolt insertion holes. The plurality of flange fixing bolts having holes are inserted into the plurality of bolt insertion holes and screwed into the plurality of screw holes, respectively.
The protective member is configured to extend in the circumferential direction along the outer peripheral surface of the motor flange portion so as to surround at least the outer portion of the motor flange portion, and the outer portion is the motor flange portion of the motor flange portion. A portion located outside the front-rear direction of the vehicle with respect to the vertical plane including the central axis, and the protective member is in the vehicle width direction with respect to at least a screw hole formed in the outer portion of the plurality of screw holes. A crawler-type traveling device for a work machine, which is configured to project from the bracket to the outside of the vehicle in the width direction of the vehicle. The crawler type traveling device for a work machine according to claim 1.
The protective member extends in the circumferential direction so as to surround the entire circumference of the motor flange portion, and protrudes outward from the bracket in the vehicle width direction to a position outside the vehicle width direction from the plurality of screw holes. A crawler-type traveling device for work machines configured to do so. The crawler type traveling device for a work machine according to claim 1 or 2.
A crawler-type traveling device for a work machine further comprising at least one fixing member for detachably fixing the protective member to the bracket. The crawler type traveling device for a work machine according to claim 3.
The at least one fixing member includes a plurality of protective member fixing bolts.
The plurality of protective member fixing bolts are arranged at intervals in the circumferential direction, and each of the plurality of protective member fixing bolts penetrates the bracket in a posture in which its shaft portion faces the vehicle width direction. A crawler-type traveling device for a work machine, which is configured to be screwed into the protective member. The crawler type traveling device for a work machine according to any one of claims 1 to 4.
The rotating casing is an inner side surface facing inward in the vehicle width direction and continuous in an annular shape in the circumferential direction, and from the inner peripheral edge of the inner side surface in the radial direction to the inside in the vehicle width direction. It has an outer peripheral surface that overhangs and faces outward in the radial direction and is continuous in an annular shape in the circumferential direction.
The protective member has an end face that is adjacent to the inner surface of the rotary casing with a gap in the vehicle width direction and is continuous in an annular shape or an arc shape, and an end face that is inside the end face in the radial direction. An inner peripheral surface that projects inward in the vehicle width direction from the inner peripheral edge and is adjacent to the outer peripheral surface of the rotating casing with a gap in the radial direction and is continuous in an annular or arc shape. Have and
A crawler-type traveling device for a work machine, provided with a floating seal mechanism for sealing a gap between the fixed casing and the rotary casing inside the rotary casing in the radial direction with respect to the outer peripheral surface. The crawler type traveling device for a work machine according to any one of claims 1 to 5.
A radial gap is formed between the protective member and the motor flange portion to allow the fixed casing to move relative to the bracket and the protective member in the vehicle width direction. Crawler type traveling device for work machines. The method for manufacturing a crawler type traveling device for a work machine according to claim 6.
A step of preparing the fixed casing, the crawler frame, the plurality of flange fixing bolts, and the protective member, and
The step of fixing the protective member to the bracket of the crawler frame and
By moving the fixed casing relative to the bracket and the protective member in the vehicle width direction, the motor flange portion of the fixed casing is adjacent to the bracket flange portion of the bracket in the vehicle width direction. A step of arranging the motor flange portion of the fixed casing inside the protective member in the radial direction, and a step of arranging the motor flange portion.
A method for manufacturing a crawler type traveling device, comprising a step of fixing the motor flange portion to the bracket flange portion with the plurality of flange fixing bolts.

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