JP2006219871A - Travel device and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower travel device facilitating access to the inside of a cover while positively protecting a travel motor by the cover. <P>SOLUTION: A cover body 65 provided at a travel frame 12 is provided with a hole part 76 for maintenance, and a reinforcing cover 67 for opening/closing the hole part 76 is detachably provided at the cover body 65. Even when an upward thrust of a rock or the like occurs during the operation of a hydraulic shovel in a stone crushing site or the like, load to the cover body 65 is dispersed by the deformation of the reinforcing cover 67 to prevent the deformation of the cover body 65 to protect it. The travel motor 18 covered with the cover 38 can thereby be positively protected. A relief valve 55 can be easily accessed via the hole part 76 by removing the reinforcing cover 67 from the cover body 65, and maintenance and inspection are facilitated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a traveling apparatus including a fluid pressure motor that rotationally drives drive wheels, and a work machine including the traveling apparatus.

  2. Description of the Related Art Conventionally, a traveling device for a work machine such as a hydraulic excavator has a long traveling frame, and a driving wheel is rotatably supported at one end of the traveling frame, and the other end is obeyed. A driving wheel is rotatably supported, and an endless crawler belt is wound around the traveling frame across the driving wheel and the driven wheel.

  A hydraulic motor that rotates the drive wheels is attached to the inside of one end of the traveling frame, and this hydraulic motor is covered with a cover attached to the traveling frame (see, for example, Patent Document 1). .)

  Specifically, as shown in FIG. 7 and FIG. 8, a motor housing portion 4 that houses a hydraulic motor (not shown) is provided at one end portion of the traveling frame 2 around which the crawler belt 1 is wound. 4 is provided with an opening 5 opened inside the traveling frame 2, and a cover 6 for closing the opening 5 is attached to the opening 5. The cover 6 is fixed to the traveling frame 2 by being tightened by a large number of bolts.

Furthermore, the hydraulic motor is provided with a relief valve that controls the internal pressure of the hydraulic motor to maintain the normal operation of the hydraulic motor. The relief valve faces the opening 5 in a state where the hydraulic motor is housed in the motor housing 4.
JP 2002-348912 A (page 3, FIG. 1)

  Since the traveling device as described above is located on the lower side of the work machine, for example, when the work machine is operated in a quarry or the like, the cover 6 is deformed by pushing up a rock or the like, and the deformation causes the hydraulic motor. May be damaged.

  In particular, if the relief valve of the hydraulic motor is damaged, the normal operation of the hydraulic motor may not be easy.

  For this reason, the further improvement of the cover 6 for protecting a hydraulic motor reliably is desired.

  Further, it is desirable to periodically maintain the relief valve of the hydraulic motor in order to ensure the normal operation of the hydraulic motor. However, in the traveling apparatus as described above, when the worker accesses the inside of the cover 6 In addition, the cover 6 covering the hydraulic motor must be removed once. And since this cover 6 is fixed to the traveling frame 2 by a large number of bolts, it takes time to remove the cover 6 and it is not easy to access the inside.

  The present invention has been made in view of the above points, and provides a traveling device that reliably protects a hydraulic motor by a cover and facilitates access to the inside of the cover, and a work machine including the traveling device. It is intended.

  According to the first aspect of the present invention, a traveling frame having an opening, a driving wheel rotatably provided on the traveling frame, a fluid pressure motor that rotationally drives the driving wheel, and the fluid pressure motor are covered. A cover provided on the traveling frame so as to close the opening, the cover having a maintenance hole, and a cover main body provided on the traveling frame, and detachably provided on the cover main body. , A traveling device provided with an auxiliary plate capable of opening and closing the hole portion by attaching and detaching, and providing a maintenance hole portion in the cover body provided on the traveling frame of the cover that covers the fluid pressure motor and closes the opening portion By providing an detachable auxiliary plate on the cover body that can open and close this hole, for example, even when a rock is pushed up, the auxiliary plate is deformed to disperse external force and protect the cover body, Pressure mode Together reliably protect, through the hole by removing the from the cover main body supporting plate become readily accessible to the inside of the cover, maintenance is facilitated.

  According to a second aspect of the present invention, in the traveling device according to the first aspect, the fluid pressure motor includes a pressure control valve that controls the internal pressure, and the pressure control valve is disposed on the traveling frame so as to face the opening. The cover body has a bent portion facing the pressure control valve and bent in an inclined shape corresponding to the outer shape of the fluid pressure motor, and a hole is provided in the bent portion, facing the opening. The bent portion facing the pressure control valve of the fluid pressure motor is bent in an inclined manner in the cover body corresponding to the outer shape of the fluid pressure motor, and a hole is formed in this bent portion, so that the hole becomes the pressure control valve. Access to the pressure control valve is facilitated, and a clearance between the pressure control valve and the cover, which is reduced by the bent portion, is secured by the hole.

  The invention according to claim 3 is the traveling device according to claim 2, wherein the auxiliary plate is attached to the cover main body across the bent portion, and the auxiliary plate is attached to the cover main body across the bent portion. The cover body is more reliably protected by making it difficult to transmit the external force applied to the auxiliary plate to the bent part.

  According to a fourth aspect of the present invention, in the travel device according to any one of the first to third aspects, the auxiliary plate is attached to and detached from the cover main body with a bolt, and the auxiliary plate can be attached to and detached from the cover main body with a bolt. Thus, the auxiliary plate can be easily attached and detached.

  According to a fifth aspect of the present invention, there is provided the traveling device according to any one of the first to fourth aspects, a revolving body provided on the traveling device so as to be capable of turning, and a work device provided on the revolving body so as to be operable. It is a working machine equipped with a hole for maintenance in the cover body provided in the traveling frame of the cover that covers the fluid pressure motor and closes the opening, and an auxiliary plate that can open and close this hole is attached to and detached from the cover body For example, even when a rock is pushed up, the auxiliary plate is deformed to disperse external force to protect the cover body, and to protect the hydraulic motor, and to secure the auxiliary plate from the cover body. Removal makes it easy to access the inside of the cover through the hole, facilitating maintenance and inspection.

  According to the first aspect of the present invention, a hole for maintenance is provided in the cover main body provided in the traveling frame, and an auxiliary plate capable of opening and closing the hole is provided in the cover main body so as to be detachable. Even when pushing up, the auxiliary plate can be deformed to protect the cover body and the hydraulic motor can be securely protected, and by removing the auxiliary plate from the cover body, the inside of the cover can be easily accessed. Maintenance and inspection become easier.

  According to the second aspect of the present invention, the bent portion facing the pressure control valve of the fluid pressure motor facing the opening is bent in an inclined manner to the cover body corresponding to the outer shape of the fluid pressure motor, and the bent portion By providing the hole portion, the hole portion comes close to the pressure control valve so that the pressure control valve can be easily accessed, and a clearance between the pressure control valve and the cover that is reduced by the bent portion can be secured by the hole portion.

  According to the invention described in claim 3, by attaching the auxiliary plate to the cover main body across the bent portion, it is difficult to transmit the external force applied to the auxiliary plate to the bent portion, and the cover main body can be more reliably protected.

  According to invention of Claim 4, an auxiliary | assistant board can be easily attached or detached by making an auxiliary | assistant board detachable to a cover main body with a volt | bolt.

  According to the invention described in claim 5, by providing a hole for maintenance in the cover body, and by providing an detachable auxiliary plate on the cover body for opening and closing the hole, for example, even when rocks or the like are pushed up The auxiliary plate is deformed to distribute the external force and protect the cover body, and the hydraulic motor can be securely protected, and by removing the auxiliary plate from the cover body, the inside of the cover can be easily accessed Maintenance and inspection become easier.

  Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIGS.

  4 and 6 show a hydraulic excavator as a work machine, and a lower traveling device 11 as a traveling device moves a pair of long traveling frames (this traveling frame is called a “track frame” or the like) 12 to the left and right. An upper swing body 15 as a swing body is provided on a center frame 13 provided on both sides and provided between the traveling frames 12 so as to be swingable via a swing bearing portion 14, and the front of the upper swing body 15 is provided. A cab 16 for protecting an operator is mounted on the left side of the unit, and a work device 17 is operably provided at the center of the front part of the upper swing body 15.

  As shown in FIGS. 1 and 6, the lower traveling device 11 includes a traveling motor 18 that is a hydraulic motor as a fluid pressure motor and a speed reducer at one end of a traveling frame 12 that is located on each of the left and right sides of the excavator. A gear-shaped sprocket 21 as a driving wheel that is driven to rotate by a traveling unit 20 having a final drive 19 as a shaft is pivotally supported, and an idler 22 as a driven wheel at the other end of each traveling frame 12 is rotatable. A crawler belt (this crawler belt is referred to as “track” or “crawler”) 23 is mounted around the sprocket 21 and the idler 22 so as to be able to rotate and move.

  The lower side of the crawler belt 23 is movable from the upper side by a plurality of lower rollers 25 (which are referred to as “track rollers”) that are arranged at the lower part of each traveling frame 12 and pivotally supported. Further, the upper portion of the crawler belt 23 is supported by a plurality of upper rollers pivotally supported on the upper portion of each traveling frame 12 via a support bracket 26 (these upper rollers are "carrier rollers", etc. It is supported by the lower side by 27).

  In the following description, the sprocket 21 side is the front side and the idler 22 side is the rear side.

  As shown in FIGS. 4 and 5, each traveling frame 12 includes a frame body 28 that is elongated in the front-rear direction, and a mounting portion 29 that is provided at the front end of the frame body 28 and to which the traveling portion 20 is attached. Have.

  The frame main body 28 is provided in a substantially rectangular tube shape, a support bracket 26 that rotatably supports each upper roller 27 is provided on the upper portion, and a lower support bracket (not shown) that rotatably supports each lower roller 25 Projecting at the bottom, and rib-shaped rising portions 32 for reinforcement are projected substantially horizontally from the upper and lower sides toward the center in the width direction of the excavator, and further, between the upper and lower rising portions 32 A plurality of reinforcing ribs 33 are provided, and the idler 22 shown in FIG. 6 is rotatably supported on the rear end side opposite to the attachment portion 29.

  As shown in FIGS. 1, 4 and 5, the mounting portion 29 protrudes from the front side of the bracket 34 provided in the left-right direction at the front end of the frame body 28, and the front side is substantially circular. A plate-shaped mounting plate portion 35 that is curved in a straight line and protrudes in the front-rear direction, and a rib portion 36 that protrudes substantially horizontally from the peripheral portion of the mounting plate portion 35 toward the center in the width direction of the hydraulic excavator. The bracket 34, the mounting plate portion 35 and the rib portion 36 form an opening 37 whose outer peripheral edge is partitioned, and a steel cover 38 covering the opening 37 is detachably attached. The motor accommodating portion 39 is partitioned inside.

  The bracket 34 is provided with a hose insertion hole (not shown) having a long hole shape in the vertical direction through which the hoses 41 and 42 shown in FIG. 3 as hydraulic piping connected to the traveling motor 18 are inserted. ing.

  As shown in FIGS. 3 to 5, these hoses 41 and 42 are inserted into a grommet 44 fitted into a hose insertion hole, a grommet 46 fitted into an insertion hole 45 formed in the center frame 13, and the like. In addition, the straps 47 and 47 are gathered together and covered by a hose cover 48 that is detachably attached to the rear portion of the bracket 34, and is illustrated via a swivel joint 49 disposed at the center of rotation of the upper swing body 15. The control valve is not connected, or is connected to a pilot manifold (not shown) for switching the traveling speed.

  Further, as shown in FIG. 1, the mounting plate portion 35 is formed with a round hole-like fitting hole 51 into which the final drive 19 is fitted at a substantially central portion. A number of bolt holes (not shown) for fixing the drive 19 are provided.

  Further, the rib portion 36 is provided with a large number of bolting portions 52 for fixing the cover 38 at the inner peripheral edge portion. A lower portion of the rib portion 36 is formed with a cutout portion corresponding to the bent shape of the cover 38 from an end portion on the center side in the width direction of the excavator.

  Here, the traveling motor 18 is, for example, a substantially cylindrical axial piston motor, and includes a swash plate, a cylinder block, a piston, and the like (not shown) inside, and a hose 41 from a hydraulic oil tank (not shown) provided in the upper swing body 15. It is operated by hydraulic oil supplied and discharged via Further, the travel motor 18 has an output shaft (not shown) projecting from one end side, and as shown in FIG. 1, a relief valve 55 as a pressure control valve for controlling the internal pressure by adjusting the set pressure at the other end side. Is protruding.

  Then, the traveling motor 18 has a motor so that the output shaft is directed to the final drive 19 side, that is, the outer side of the hydraulic excavator, and the relief valve 55 is biased to the opposite side of the final drive 19, that is, the lower side facing the opening 37. Arranged in the accommodating portion 39. Therefore, the relief valve 55 faces the cover 38 attached to the opening 37 in the state where the traveling motor 18 is attached.

  Further, as shown in FIGS. 1 and 3, the final drive 19 includes a substantially bottomed cylindrical casing 57 fitted into the fitting hole 51. The casing 57 has a traveling motor 18 on one end side. A first housing part 58 to be inserted and a second gear which is an internal gear provided on the opposite side of the first housing part 58 from the traveling motor 18 so as to be rotatable relative to the first housing part 58. And a housing portion 59. The casing 57 accommodates a reduction mechanism (not shown) connected to the output shaft of the travel motor 18 and meshed with the second housing part 59.

  Further, on the outer peripheral surface of the first housing portion 58, a first flange portion 61 that is attached to the side surface opposite to the motor housing portion 39 of the mounting plate portion 35 and is bolted from the motor housing portion 39 side extends over the entire circumference. Projecting. Further, as shown in FIG. 3, a second flange portion 62 protrudes from the outer peripheral surface of the second housing portion 59 over the entire circumference, and the second flange portion 62 is shown in FIG. 1. The sprocket 21 is attached by bolting.

  As shown in FIGS. 1 to 5, the cover 38 includes a cover body 65 attached to the opening 37 with a plurality of bolts 64, and a reinforcing cover as an auxiliary plate that can be attached to and detached from the cover body 65. 67.

  As shown in FIGS. 2 and 5, the cover main body 65 includes a main body upper portion 71, a bent portion 72 continuous with the lower portion of the main body upper portion 71, and a lower body portion 73 continuous with the lower portion of the bent portion 72. A plurality of bolts having an outer shape along the inner edge of the opening 37 in a side view and having bolts 64 inserted at positions slightly inside the outer peripheral edge portions of the main body upper portion 71 and the main body lower portion 73 Each hole 75 is formed. The cover body 65 is attached to the opening 37 such that the front side of the bent portion 72 is inclined upward with respect to the rear side.

  The main body upper portion 71 covers the opening portion 37 above the notch portion of the rib portion 36 with the cover 38 attached to the opening portion 37, and the upper and rear edges are formed in a straight line, and the front side Are formed in a circular arc shape, and the rear side is in close contact with the front side surface of the bracket 34 and is also in close contact with the inner edge surface of the rib portion 36 from the upper side to the front side.

  Further, the bent portion 72 has a longitudinal shape in the front-rear direction that is bent in a linearly inclined manner so as to approach the traveling frame 12 from the lower end portion of the main body upper portion 71 toward the lower direction corresponding to the outer shape of the traveling motor 18. It is a flat part, with the cover 38 attached to the opening 37, both front and rear end parts are fitted to the front and rear parts of the notch part of the rib part 36 without a gap, and is positioned facing the relief valve 55 of the travel motor 18 is doing. For this reason, in the motor accommodating portion 39, the gap between the cover 38 and the traveling motor 18 is the narrowest at the position of the bent portion 72.

  A square hole-like hole 76 is formed at the center of the bent part 72. The hole 76 has, for example, a longitudinal direction in the front-rear direction and a vertical dimension over substantially the entire vertical width of the bent portion 72. Further, the tip of the relief valve 55 faces the hole 76 with the cover 38 attached to the opening 37. For this reason, the maintenance check of the relief valve 55 and the adjustment of the set pressure can be performed through the hole 76.

  The main body lower portion 73 covers the opening 37 below the notch of the rib portion 36 with the cover 38 attached to the opening 37, and the lower edge is formed in an arc shape. The rib 36 is in close contact with the inner edge surface.

  On the other hand, the reinforcing cover 67 is a flat reinforcing cover body 82 that is attached to the main body upper portion 71 of the cover main body 65 by a plurality of bolts 81, and a curved curved surface that is continuously bent at the lower end of the reinforcing cover main body 82. And a flat mounting flange portion 85 that is bent continuously at the lower end portion of the curved surface portion 83 and is attached to the lower body portion 73 by a plurality of bolts 84.

  The reinforcing cover main body 82 has an upper edge portion formed in a straight line shape, and a lower end portion which is a continuous portion with the curved surface portion 83 is formed in a convex arc shape on the lower side. The reinforcing cover body 82 has a plurality of bolt insertion holes 87 into which bolts 81 are respectively inserted, and upper bolts formed on the lower end side of the upper body 71 corresponding to the bolt insertion holes 87. By tightening the bolt 81 in the hole 88, it is attached to the main body upper portion 71 so that the lower end side protrudes toward the bent portion 72 and the main body lower portion 73 in a side view.

  Further, the curved surface portion 83 is a circumferential surface that is bent substantially perpendicularly from the lower end portion of the reinforcing cover main body 82, and is formed in an inclined shape so that the tip is in contact with the outer surface of the bent portion 72. Accordingly, the reinforcing cover 67 is attached to the cover main body 65, and the lower side and the curved surface portion 83 of the reinforcing cover main body 82 straddle the bent portion 72 of the cover main body 65. The reinforcing cover main body 82, the curved surface portion 83, and the bent portion 72 A space 91 in which the hole 76 is located is formed between the two.

  The mounting flange portion 85 protrudes downward from a central region in the front-rear direction of the lower end portion on the front end side of the curved surface portion 83 toward the lower side substantially parallel to the reinforcing cover main body 82, and a bolt insertion hole portion into which the bolt 84 is inserted. A plurality of holes 93 are formed, and are attached to the lower body 73 by tightening bolts 84 into lower bolt holes 94 formed in the lower body 73 corresponding to these bolt insertion holes 93.

  Next, functions and effects of the embodiment shown in FIGS. 1 to 6 will be described.

  The cover body 65 provided in the traveling frame 12 is provided with a maintenance hole 76, and a reinforcing cover 67 capable of opening and closing the hole 76 is detachably provided on the cover body 65, so that, for example, a hydraulic excavator in a quarry, etc. Even when rocks and other objects are pushed up during operation, the reinforcing cover 67 is deformed to disperse the load on the cover body 65 to prevent the cover body 65 from being deformed and protected and covered with the cover 38. The travel motor 18 can be reliably protected, and the reinforcing cover 67 can be removed from the cover body 65 to easily access the inside of the cover 38 through the hole 76, specifically, the relief valve 55, facilitating maintenance and inspection. Become.

  Further, a bent portion 72 facing the relief valve 55 of the travel motor 18 facing the opening 37 is bent in an inclined manner to the cover body 65 corresponding to the outer shape of the travel motor 18, and a hole 76 is formed in the bent portion 72. In other words, by positioning the hole 76 in the part where the clearance between the traveling motor 18 and the cover 38 is the smallest, the hole 76 approaches the relief valve 55, and the relief valve 55 is more easily accessed via the hole 76. The clearance between the relief valve 55 and the cover main body 65 that can be reduced by the bent portion 72 can be secured by the hole 76.

  Further, by attaching the reinforcing cover 67 to the cover main body 65 across the bent portion 72, it is difficult to transmit the external force applied to the reinforcing cover 67 to the bent portion 72, and the cover main body 65 can be more reliably protected.

  Then, by making the reinforcing cover 67 detachable from the cover main body 65 with the bolts 81 and 84, the cover main body 65 can be easily attached and detached, and access to the inside of the cover 38 becomes easier.

  Further, by covering the hoses 41 and 42 connected to the traveling motor 18 with the hose cover 48, the hoses 41 and 42 can be prevented from being damaged, and good operability of the traveling motor 18 can be secured.

  Furthermore, by applying the lower traveling device 11 to a hydraulic excavator, the maintenance and inspection of the hydraulic excavator is facilitated, and the reliability of the hydraulic excavator can be improved.

  In the above embodiment, the part of the traveling motor 18 that faces the hole 76 is not limited to the relief valve 55, but faces any part of the traveling motor 18 that requires maintenance and inspection. Providing the hole 76 facilitates maintenance and inspection of the traveling motor 18.

  Further, the shape of the cover main body 65 and the reinforcing cover 67 of the cover 38 or the shape of the hole 76 is not limited to the above configuration.

  Furthermore, the lower traveling device 11 can be applied to work machines other than hydraulic excavators.

It is a front view which shows the principal part of one Embodiment of the traveling apparatus which concerns on this invention. It is a side view which shows the principal part of a traveling apparatus same as the above. It is a perspective view which shows a part of internal structure of a traveling apparatus same as the above. It is a top view which shows the principal part of the working machine provided with the traveling apparatus same as the above. It is AA sectional drawing shown in FIG. 4 of a traveling apparatus same as the above. It is a side view which shows a working machine same as the above. It is a perspective view which shows the principal part of the traveling apparatus of a prior art example. It is a perspective view which expands and shows the principal part of a traveling apparatus same as the above.

Explanation of symbols

11 Lower traveling device as a traveling device
12 Travel frame
15 Upper swing body as a swing body
17 Work equipment
18 Traveling motor as a fluid pressure motor
21 Sprocket as drive wheel
37 opening
38 Cover
55 Relief valve as pressure control valve
65 Cover body
67 Reinforcement cover as auxiliary plate
72 Bend
76 holes

Claims (5)

A traveling frame with an opening;
A drive wheel rotatably provided on the traveling frame;
A fluid pressure motor for rotationally driving the drive wheel;
A cover provided on the traveling frame so as to cover the fluid pressure motor and close the opening,
Cover
A cover body provided with a hole for maintenance and provided on the traveling frame;
A traveling device comprising an auxiliary plate that is detachably provided on the cover body and that can open and close the hole portion by the attachment and detachment. The fluid pressure motor includes a pressure control valve that controls the internal pressure, and is disposed on the traveling frame so that the pressure control valve faces the opening,
The cover body includes a bent portion that is opposed to the pressure control valve and is bent in an inclined shape corresponding to the outer shape of the fluid pressure motor,
The traveling device according to claim 1, wherein the hole is provided in the bent portion. The travel device according to claim 2, wherein the auxiliary plate is attached to the cover body across the bent portion. The traveling device according to any one of claims 1 to 3, wherein the auxiliary plate is attached to and detached from the cover body with a bolt. A traveling device according to any one of claims 1 to 4,
A swivel body that is turnably provided on the traveling device;
A work machine comprising: a work device operably provided on the swivel body.

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