JP2019105104A - Shovel - Google Patents

Abstract

To provide a shovel capable of suppressing the intrusion of mud, dust, etc. into a motor case, and suppressing deformation of a cover or the motor case or breakage of a fixing bolt due to foreign matter intrusion.SOLUTION: A shovel 100 includes a crawler type lower traveling body 1, an upper revolving body 3 mounted on the lower traveling body 1, a traveling hydraulic motor 16 as a drive source of the lower traveling body 1, a motor case 20 for housing the traveling hydraulic motor 16 therein, and a cover 22 for closing an inner opening 20D of the motor case 20. The cover 22 is fixed in contact with an end surface 20H on the inner opening 20D side of the motor case 20, and the outer shape of the cover 22 is smaller than the outer shape of the end surface 20H.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a shovel.

  Conventionally, in a lower case of a shovel, in a motor case that accommodates a traveling motor, a cover is bolted to the opening to cover. As a result, the traveling motor installed inside the motor case is protected from external force received by the rock or wood in the shovel traveling environment, and mud and dust are prevented from invading the inside of the motor case. There is.

JP-A-8-58643

  However, in the conventional cover described in Patent Document 1 etc., the cover is fitted and installed inside the motor case. With this structure, it is impossible to completely prevent mud and dust from invading the inside of the case from the gap between the motor case and the cover, and removing the mud accumulated inside the case when the motor in the case is maintained. For example, maintenance of the traveling motor may be degraded. In addition, when a piece of wood etc. is inserted into the gap between the motor case and the cover at any timing during traveling, the cover or the motor case may be deformed by the large external force according to the principle of scissors, or the cover may be fixed to the motor case May break.

  An object of the present disclosure is to provide a shovel capable of suppressing the intrusion of mud, dust, and the like into the inside of the motor case, and suppressing deformation of the cover or the motor case and breakage of the fixing bolt due to foreign matter intrusion.

  A shovel according to one aspect of the embodiment includes a crawler lower traveling body, an upper swing body mounted on the lower traveling body, a traveling hydraulic motor as a drive source of the lower traveling body, and the traveling hydraulic pressure. A motor case for housing the motor inside and a cover for closing the inner opening of the motor case, the cover is fixed in contact with the end surface on the inner opening side of the motor case, and the outer shape of the cover is And smaller than the outer shape of the end face.

  According to the present disclosure, it is possible to provide a shovel capable of suppressing the intrusion of mud, dust and the like into the inside of the motor case and suppressing the deformation of the cover and the motor case due to the intrusion of foreign matter and the breakage of the fixing bolt.

It is a side view of a shovel concerning one embodiment of the present invention. FIG. 6 is a partial cross-sectional view of a lower traveling body in which a configuration of a mounting portion of a traveling hydraulic motor is enlarged. It is the figure which looked at the motor case from the cover side in the state to which the cover was attached. It is IV-IV sectional drawing in FIG. It is sectional drawing which shows the modification of the shape of a cover.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  In the following description, the X direction, the Y direction, and the Z direction are directions perpendicular to one another, the X direction and the Y direction are horizontal directions, and the Z direction is a vertical direction. The X direction is the front-rear direction of the shovel 100, the front side is the X positive direction, and the rear side is the X negative direction. The Y direction is the lateral width direction of the shovel 100, the left side is the Y positive direction, and the right side is the Y negative direction. The Z direction is the height direction of the shovel 100, and the upper side is the Z positive direction, and the lower side is the Z negative direction.

  First, a schematic configuration of a shovel 100 according to the present embodiment will be described with reference to FIG. 1. FIG. 1 is a side view of a shovel 100 according to an embodiment of the present invention.

  The shovel 100 is provided with a crawler type lower traveling body 1. An upper revolving unit 3 is mounted on the lower traveling unit 1 via a turning mechanism 2. A boom 4 is attached to the upper swing body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 is attached to the tip of the arm 5. The boom 4, the arm 5, and the bucket 6 constitute a digging attachment which is an example of the attachment. The boom 4, the arm 5 and the bucket 6 are hydraulically driven by the boom cylinder 7, the arm cylinder 8 and the bucket cylinder 9 respectively. A power source such as the engine 11 is mounted on the upper revolving superstructure 3. A cabin 10 is installed in the upper revolving superstructure 3.

  The lower traveling body 1 mainly includes a frame 12, a crawler belt 13, a carrier roller 14, a track roller 15, a traveling hydraulic motor 16, a driven wheel 17, and the like.

  The frame 12 is a member that forms the frame of the lower traveling body 1. The frame 12 includes a central frame portion 12C coupled to the turning mechanism 2, a left frame portion 12L coupled to the Y positive direction side of the central frame portion 12C, and a right frame portion 12R coupled to the Y negative direction side (see FIG. 1) has the back of the sheet).

  The crawler belt 13 is an endless track (track) which is rotationally driven by the traveling hydraulic motor 16.

  The carrier roller 14 is a driven roller disposed between the frame 12 and the crawler belt 13 on the upper side of the frame 12. The track roller 15 is a driven roller disposed between the frame 12 and the crawler belt 13 below the frame 12.

  The traveling hydraulic motor 16 is attached to the rear end (X negative direction side end) of the frame 12. The traveling hydraulic motor 16 is a drive source of the lower traveling body 1.

  The driven wheel 17 is attached to the front end (X positive direction side end) of the frame 12.

  The crawler belt 13 meshes with a drive sprocket 16C (see FIG. 2) coupled to the rotation shaft of the traveling hydraulic motor 16 and the driven wheel 17.

  The crawler belt 13, the carrier roller 14, the track roller 15, the traveling hydraulic motor 16, and the driven wheel 17 are respectively provided in the left frame portion 12L and the right frame portion 12R.

  With this configuration, when the traveling hydraulic motor 16 rotates counterclockwise in FIG. 1, the crawler belt 13 also rotates counterclockwise to move the shovel 100 forward. Conversely, when the traveling hydraulic motor 16 rotates clockwise, the crawler belt 13 also rotates clockwise, and the shovel 100 retracts.

  FIG. 2 is a partial cross-sectional view of the lower traveling body 1 in which the configuration of the mounting portion of the traveling hydraulic motor 16 is enlarged. FIG. 2 shows a cross-sectional view of the frame 12 of the undercarriage 1 cut at an arbitrary XY plane. FIG. 2 is an enlarged view of the mounting portion of the traveling hydraulic motor 16 of the right frame portion 12R of the frame 12. Therefore, the "outside" used in the following description indicates the Y negative direction side and the "inner side" indicates the Y positive direction side, but in the case of the same left frame portion 12L configuration, the "outside" is reversed. It becomes the Y positive direction side, and "inside" becomes the Y negative direction side.

  As shown in FIG. 2, the upper swing body 3 is rotatable relative to the lower traveling body 1 with the position of the center joint 18 as a rotation center. The traveling hydraulic motor 16 is driven by hydraulic pressure supplied from a power source such as an engine 11 or a pump (not shown) provided on the upper swing body 3. This hydraulic pressure is supplied from the upper swing body 3 to the traveling hydraulic motor 16 through a pipe 19 disposed in the lower traveling body 1 through the center joint 18.

  The traveling hydraulic motor 16 is accommodated in a motor case 20 attached to the rear end (X negative direction side end) of the frame 12. The traveling hydraulic motor 16 has a motor unit 16A that outputs a driving force, and a reduction gear unit 16B that decelerates the driving force output from the motor unit 16A. The motor unit 16A and the reduction gear unit 16B are disposed, for example, along the rotational axis direction (Y direction) of the motor as shown in FIG.

  The motor case 20 has an outer side plate portion 20A disposed outside and a side plate portion 20B erected inward along the outer edge of the outer side plate portion 20A. In the outer side plate portion 20A, an outer opening 20C opened to the outside of the motor case is formed at a part of the center. On the other hand, along the inner peripheral surface of the side plate portion 20B, only the end face 20H of the side plate portion 20B is formed on the same plane on the inner side of the motor case 20 opposite to the outer side plate portion 20A and the Y axis direction. An open inner opening 20D is formed. In FIG. 2 and FIG. 3, the lead lines of the symbols of the openings are indicated by alternate long and short dashed lines.

  The motor portion 16A is accommodated inside the motor case 20 from the outer side plate portion 20A through the outer opening 20C. On the other hand, the reduction gear portion 16B is disposed outside the outer side plate portion 20A in contact with the outer side plate portion 20A. In other words, the reduction gear unit 16B closes the outer opening 20C and is disposed outside the motor case 20, and the motor unit 16A is disposed inside the motor case 20. The above-mentioned drive sprocket 16C is disposed on the outer periphery of the reduction gear portion 16B.

  The outer shape of the contact portion of the reduction gear portion 16B with the outer plate portion 20A of the motor case 20 is larger than the diameter of the outer opening 20C. Thus, the entire outer opening 20C of the motor case 20 can be closed, and the hermeticity of the motor case 20 can be enhanced. In the present embodiment, “enhancing the sealing property” means that at least stones, mud and the like are less likely to flow into the motor case 20, and airtightness that prevents the flow of gas is not necessary.

  The reduction gear portion 16B is bolted to the outer side plate portion 20A from the inner side of the outer side plate portion 20A of the motor case 20 to the outer periphery of the outer opening 20C, for example. Thus, the traveling hydraulic motor 16 is fixed to the motor case 20. Further, the gap between the motor and the case at the outer opening 20C can be made smaller, and the sealing property of the motor case 20 is further enhanced.

  A pipe 19 for supplying hydraulic pressure from the upper swing body 3 side is connected to the motor portion 16A inside the motor case 20 through an internal space 21 connecting the center joint 18 and the motor case 20 inside the frame 12. An opening 31 is provided in a surface of the rear end of the frame 12 exposed to the inside of the motor case 20, and the opening 31 communicates the internal space 21 of the frame 12 with the inside of the motor case 20. Similarly, an opening 33 is provided in a peripheral wall 32 provided around the center joint 18, and the opening 33 communicates the center joint 18 side of the internal space 21 of the frame 12 with the rear end of the frame 12. . The pipe 19 connects the center joint 18 and the motor portion 16A through the two openings 31 and 33 inside the frame 12. The motor unit 16A outputs a driving force by the hydraulic pressure supplied through the pipe 19.

  Since the pipe 19 is routed through the two openings 31 and 33 inside the frame 12 as described above, a space in which the inside of the motor case 20 is shielded is formed while maintaining the rigidity of the frame 12. With this configuration, the piping 19 for supplying hydraulic pressure can be arranged in the sealed space inside the frame 12, so that a situation where a foreign object such as stone collides with the piping 19 can be avoided while the shovel 100 is traveling, and the piping 19 can be assured Can be protected. Further, since it is not necessary to insert the pipe 19 from the outside of the motor case 20 into the interior, foreign matter such as earth and sand does not intrude into the motor case 20 due to the arrangement of the pipe 19.

  The inner opening 20D of the motor case 20 is closed by a cover 22. FIG. 3 is a view of the motor case 20 viewed from the cover 22 side with the cover 22 attached. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  As shown in FIGS. 3 and 4, the cover 22 is fixed in contact with the end face 20H on the inner opening 20D side of the motor case 20 (that is, the end face 20H of the side plate portion 20B) and the entire circumference of the end face 20H. . That is, the outer shape of the cover 22 is formed to be larger than the inner opening of the motor case 20 and smaller than the outer shape of the end face 20H of the side plate portion 20B. In the present embodiment, the "outside" means the contour shape or the outer edge shape of the cover 22 or the side plate portion 20B. In other words, over the entire periphery of the side plate portion 20B of the motor case 20, an outer peripheral surface 20F of the side plate portion 20B that faces the inside of the motor case 20, and the side plate portion It is arrange | positioned between 20B and the outer peripheral surface 20G facing the motor case 20 outer side among 20B.

  By forming the cover 22 in this manner, the entire inside opening 20D of the motor case 20 can be completely closed by the cover 22, and the hermeticity of the motor case 20 can be enhanced. In addition, since the sealing performance is enhanced, it is possible to prevent mud and dust from entering the inside of the case, and therefore the amount of mud and dust deposited inside the case 20 can be reduced. As a result, for example, when servicing the motor 16 in the case 20, maintenance of the traveling hydraulic motor 16 housed in the motor case 20, such as eliminating the time and effort of removing the mud accumulated inside the case with the cover 22 opened Improve.

  By the way, in the conventional motor case structure described in patent document 1 etc., a cover is fitted and installed inside the opening of a motor case. For this reason, it is easy to make a gap between the inner wall of the motor case and the outer peripheral surface of the cover, and if a piece of wood etc. is inserted into this gap, the cover or motor case may be deformed under a large external force according to the principle of wedge, There is a possibility that the bolt fixed to the may break. With respect to such conventional problems, in the present embodiment, as described above, the cover 22 is in contact with the end face 20H of the side plate portion 20B of the motor case 20, so that the inner wall of the motor case 20 and the cover 22 are The outer circumferential surface does not face each other, and a gap between the two can not occur. Thereby, it is possible to suppress the insertion of a piece of wood or the like into the gap between the motor case 20 and the cover 22 while the shovel 100 is traveling, so it is possible to suppress the deformation of the cover 22 and the motor case 20 due to foreign matter intrusion and the breakage of the fixing bolt 23 . Therefore, the shovel 100 of the present embodiment can suppress the intrusion of mud, dust, etc. into the motor case 20, and can suppress the deformation of the cover 22 or the motor case 20 due to the intrusion of foreign matter and the breakage of the fixing bolt 23.

  Since the side plate portion 20B of the motor case 20, particularly the outer peripheral surface 20G on the X negative direction side, faces the traveling direction of the shovel 100, it is susceptible to external forces from the road surface and the traveling environment. In the present embodiment, as shown in FIG. 4, the outer shape of the cover 22 is smaller than the outer shape of the end face 20H of the side plate portion 20B of the motor case 20. Therefore, the external force received from the road surface and the traveling environment can be mainly received by the motor case 20 instead of the cover 22, and the load received by the cover 22 and the fixing bolt 23 can be reduced.

  Inside the motor case 20, a mounting seat 20E (see FIG. 3) of the cover 22 is provided. The mounting seat 20E is disposed on the same plane as the end face 20H of the side plate portion 20B. A screw hole is formed in the mounting seat 20E, and the bolt 23 is screwed by passing through the insertion hole provided in the cover 22 so that the bolt 23 is fastened and the cover 22 is fixed to the motor case 20. With this configuration, the cover 22 can be attached to the end face 20H of the motor case 20 without a gap.

  FIG. 5 is a cross-sectional view showing a modification of the shape of the cover 22. As shown in FIG. The outline of FIG. 5 is the same as that of FIG. As shown in FIG. 5, the C surface 22 B may be formed on the outer peripheral surface 22 A of the cover 22 by chamfering. By providing the C surface 22B on the cover 22 in this manner, even if an external force is applied to the outer peripheral surface 22A of the cover 22, the external force can be dispersed and released in another direction by the C surface 22B. It is possible to further reduce the load that 23 receives.

  The present embodiment has been described above with reference to the specific example. However, the present disclosure is not limited to these specific examples. Those appropriately modified in design by those skilled in the art are also included in the scope of the present disclosure as long as the features of the present disclosure are included. The elements included in the above-described specific examples, and the arrangement, conditions, and shapes thereof are not limited to those illustrated, but can be appropriately modified. The elements included in the above-described specific examples can be appropriately changed in combination as long as no technical contradiction arises.

DESCRIPTION OF SYMBOLS 100 Excavator 1 lower traveling body 3 upper revolving structure 12 frame 16 hydraulic motor 16A for traveling 16A motor unit 16B reduction gear unit 18 center joint 19 piping 20 motor case 20C outer opening 20D inner opening 20E mounting seat 20H end surface 21 inner space 22 cover 22B C surface

Claims (5)

A crawler type lower traveling body,
An upper swing body mounted on the lower traveling body;
A traveling hydraulic motor which is a drive source of the lower traveling body;
A motor case for housing the traveling hydraulic motor therein;
A cover for closing the inner opening of the motor case;
Equipped with
The cover is fixed in contact with an end face on the inner opening side of the motor case,
The outer shape of the cover is smaller than the outer shape of the end face,
Excavator. The mounting seat of the cover is disposed on the same plane as the inside of the motor case and the end face.
The shovel according to claim 1. The traveling hydraulic motor includes a motor unit that outputs a driving force, and a reduction gear unit that decelerates the driving force output from the motor unit.
The motor case has an outer opening opposite to the inner opening,
The reduction gear unit is disposed outside the motor case so as to close the outer opening, and the motor unit is disposed inside the motor case.
The shovel according to claim 1 or 2. A center joint disposed at the rotation center of the upper swing body;
Piping for supplying hydraulic pressure from the upper swing body to the traveling hydraulic motor;
Equipped with
The pipe connects the center joint and the traveling hydraulic motor through an internal space connecting the center joint and the motor case inside the frame of the lower traveling body.
The shovel according to any one of claims 1 to 3. A C surface is formed on the outer periphery of the cover,
The shovel of any one of Claims 1-4.

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