JP2000291788A - Installation device for reduction gear cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a speed reduction gear cover to a casing without using a screw. SOLUTION: In this cover, a groove 13 is provided in the periphery direction of this side of the inner periphery cylindrical surface 11 of a casing 10 and also holes with a bottom 10a, 30a are provided while riding the surfaces of the casing 10 and cover 30. When the cover 30 is installed to the casing 10, at first, the cover 30 is inserted in the cylindrical surface 11 of the casing 10 through an O ring 23 and then a piece 22 integrated with a metal ring 21 is loosely inserted in the holes with a bottom 10a, 30a through a through hole 22a and also inserted in the groove 13 while elastically deforming the metal ring 21. Thereby, the metal ring 21 stops the come out of the cover 30 and piece 22 and the piece 22 stops the turning of the cover 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mounting a speed reducer cover applied to a traveling speed reducer of a construction machine such as a hydraulic shovel or a hydraulic crane.

[0002]

2. Description of the Related Art In construction machines such as hydraulic shovels and hydraulic cranes, the rotation of a traveling hydraulic motor is reduced by a traveling speed reducer to drive the lower traveling body. The traveling speed reducer usually includes a main body casing rotatably supported by a hydraulic motor via a bearing or the like, a multi-stage reduction mechanism provided in the casing, and a cover closing an opening of the main body casing. Be composed. The cover is detachably attached to the casing in order to perform disassembly and repair of the speed reduction mechanism. A device for attaching the reduction gear cover to the casing is described in, for example,
Japanese Patent Application Laid-Open No. 119569/1991 and Japanese Utility Model Laid-Open No. 3-55956.

In the apparatus described in Japanese Utility Model Laid-Open Publication No. 61-119657, a screw hole is provided which penetrates an outer peripheral wall of a main body casing in a radial direction, and is inserted into an opening of the main casing corresponding to the screw hole. A bottomed hole is provided on the outer peripheral surface of the cover. Then, the cover is fixed to the casing by screwing the plug screw from the screw hole to the bottomed hole. By fixing the casing and the cover with the plug screw as described above, the exposure of the bolt can be prevented, the damage of the bolt during traveling can be prevented, and the space for the mounting portion can be reduced.

In the structure described in Japanese Utility Model Laid-Open Publication No. 3-55956, screw portions are provided on the outer peripheral surface of the cover and the inner peripheral surface of the main body casing, and the cover is rotated and screwed into the main body casing to fix them. A drain hole (screw hole) is provided on the surface of the cover, and a plug screw having a protrusion at the tip is screwed into the screw hole, and the protrusion is provided between the teeth of the ring gear provided on the inner peripheral wall of the casing. Insert. Thus, the rotation of the cover with respect to the casing is prevented by the contact between the projection and the teeth of the ring carrier, and the cover is prevented from being loosened.

[0005]

However, in the structure described in Japanese Utility Model Application Laid-Open No. 61-119657, it is necessary to adjust the phase of the cover with respect to the casing at the time of assembly, and the structure described in Japanese Utility Model Application Laid-Open No. 3-55956 is used. In this case, it is necessary to adjust the phase of the plug screw with respect to the teeth of the ring gear, and the assemblability deteriorates. Further, in order to fasten the casing and the cover with screws, processing accuracy is required, and the processing cost increases. Further, a flange thickness for providing the screw portion is required, which tends to increase the weight of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for attaching a speed reducer cover in which the cover and the casing can be easily attached and detached without the necessity of forming screws on the casing or the cover.

[0007]

Means for Solving the Problems (1) Referring to FIGS. 1, 2 and 5 showing an embodiment, the invention of claim 1 is characterized in that a gear mechanism 20 which rotates in conjunction with a hydraulic motor is provided. A cylindrical casing 10 housed therein, and a casing 1
0 is detachably fitted to the inner peripheral surface 11 of the
And a disc-shaped cover 30 that covers the open end surface of the gearbox to seal the inside thereof. The inner peripheral surface 1 of the open end surface of the casing 10
1 and notches 10a, 30a respectively formed on the outer peripheral surfaces of the cover 30 and the notches 10a, 30a
The rotation preventing members 22 and 24 provided in the voids formed by matching the two with each other, and the concave portion 13 formed in the inner peripheral surface 11 of the casing 10 in the circumferential direction, and the outer peripheral surface edge of the cover 30 The above-mentioned object is achieved by providing an arc-shaped retaining member 21 that abuts the rotation preventing member 35 in the circumferential direction and crosses the rotation preventing members 22 and 24. (2) According to the second aspect of the present invention, as shown in FIG. 4, a traveling speed reducer 43 which is provided on the left and right sides of the traveling body 41 and transmits rotation from a traveling hydraulic motor to a drive shaft is housed therein. Cylindrical casing 10, and a disc-shaped cover 30 which is detachably fitted to the inner peripheral surface of the casing 10 and covers the open end surface of the casing 10 to hermetically seal the inside thereof.
The present invention is applied to a reduction gear cover mounting device having: Then, the inner peripheral surface 11 of the open end surface of the casing 10 and the cover 3
0 notch portions 10a, 3 formed on the outer peripheral surface, respectively.
0a, the detent members 22 and 24 provided in the voids formed by aligning the notches 10a and 30a with each other, and the recess 13 formed in the inner peripheral surface 11 of the casing 10 in the circumferential direction. The above-described object is achieved by providing an arc-shaped stopper member 21 that is interposed and abuts the outer peripheral surface edge portion 35 of the cover 30 in the circumferential direction and crosses the rotation stopper members 22 and 24. (3) The invention according to claim 3 is that the rotation preventing members 22, 24 and the retaining member 21 are integrated.

[0008] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 4 is an external view of a hydraulic shovel having a reduction gear cover mounting device according to an embodiment of the present invention. As shown in FIG. 4, the excavator includes a lower traveling body 41 and an upper revolving body 42 that is pivotally mounted on the lower traveling body 41 via a pivoting device (not shown). Undercarriage 4
Reference numeral 1 denotes a traveling speed reducer 43 for reducing the number of rotations of the output shaft of the traveling hydraulic motor on each of the left and right sides of the vehicle. The rotation of the traveling speed reducer 43 drives the crawler 44, and the hydraulic excavator travels.

FIG. 1 is a view taken in the direction of arrow A in FIG.
2 is a sectional view taken along the line II-II in FIG. In the following, the mounting direction of the reduction gear cover is referred to as a near side or a far side as indicated by arrows in FIG. As shown in FIG. 2, the traveling speed reducer 43 includes a rotatable casing 10 connected to a hydraulic motor (not shown), a plurality of stages of reduction gears 20 for transmitting driving force to driving wheels (not shown), and a casing. 1
And a cover 30 that is detachably fitted to the cylindrical surface 0. The inner peripheral wall of the casing 10 has a cylindrical surface 1
A ring gear 12 having a diameter smaller than that of the cylindrical surface 11 is formed on the inner side. A part of the reduction gear 20 is meshed with the ring gear 12, whereby the rotation from the hydraulic motor is reduced at a predetermined reduction ratio, and the crawler 44 is driven.

As shown in FIG. 1, an oil supply hole 31 for oil supply, a drain hole 32 for oil discharge, and a level hole 33 for checking the amount of oil are provided on the surface of the cover 30, respectively. A plug screw 34 is screwed to 31 to 33. Further, as shown in FIG. 2, the outer peripheral surface of the cover 30 has a stepped shape having a larger diameter on the back side than on the near side, and the stepped portion 35 has a tapered shape. In addition, such a cover 30 is formed by casting.

The cylindrical surface 3 on the back side (large diameter portion side) of the cover 30
6 is provided with a concave groove 37 in which the O-ring 23 is interposed. The cover 30 is made of this O-ring 23
The casing 10 is fitted to the cylindrical surface 11 of the casing 10 through the opening. The cylindrical surface 11 of the casing 10 has a groove 13
A metal ring 21 having an outer diameter larger than the cylindrical surface 11 of the casing 10 and an inner diameter smaller than the cylindrical surface 36 of the cover 30 is interposed in the groove 13. I have. The metal ring 21 is elastically deformable, and a part 21a (see FIG. 1) of the metal ring 21 in the circumferential direction is divided. On the other hand, the casing 10 and the cover 3
A circular hole 10a, 30a having a predetermined depth is provided on the front side surface of the cylinder 0, and a cylindrical piece 22 is loosely fitted in the circular hole 10a, 30a. A through hole 22a is provided on the side surface of the top 22 and a metal ring 21 is inserted through the through hole 22a through a dividing portion 21a, whereby the metal ring 21 and the top 22 are integrated.

Next, a method of attaching and detaching the cover 30 will be described with reference to FIG. 3, which is an enlarged view of a part a of FIG. When attaching the cover 30 to the casing 10, first, FIG.
As shown in (a), the cover 30 in which the O-ring 23 is interposed is fitted to the cylindrical surface 11 of the casing 10, and the cover 3
The cover 30 is inserted into the rear side until the 0 end face 38 comes into contact with the stepped portion 14 of the casing 10. Next, the top 22 integrated with the metal ring 21 is inserted into the circular holes 10a and 30a.
a, and the metal ring 21 is inserted into the groove 13 of the casing 10 as follows, for example. That is, an external force is applied to the metal ring 21 to deform it three-dimensionally (elastic deformation), and the metal ring 21 is pressed against the tapered surface 35 of the cover 30 (dotted line). The groove 13 of the casing 30 is composed of an arc portion 13a on the near side and a tapered portion 13b on the back side. In order to return to the shape, the diameter increases along the tapered portion 13b of the casing 10 and is hooked on the arc portion 13a (solid line).

When the hydraulic motor is driven to rotate from this state, the internal pressure of the casing 10 increases, and as shown in FIG. 3B, the cover 30 is pushed forward by the internal pressure p. Then, when the tapered surface 35 of the cover 30 comes into contact with the metal ring 21, the movement to the near side is further inhibited. At this time, the metal ring 21 functions as a stopper for the cover 30.

To check the supply and discharge of oil and the amount of oil, the casing 10 is rotated to set the oil supply hole 31 of the cover 30 directly above. Next, the plug screw 34 is removed using a tool such as a spanner. When the screws 34 are removed, a torque acts on the cover 30 in the direction in which the screws are loosened. However, since the phase (relative phase) of the cover 30 is regulated by the top 22, the rotation of the cover 30 is prevented. At this time, the top 22 functions as a stopper for the cover 30. When supplying oil, the oil supply hole 31 and the level hole 33 are both opened to supply oil. Then, when a predetermined amount of oil is accumulated and the oil overflows from the level hole 33, the oil supply is stopped.

On the other hand, when the cover 30 is to be removed, on the contrary, the top 22 is first removed while the cover 30 is pressed to the rear side, and a notch provided on the surface of the casing 10, for example. 14 (see FIG. 1), the metal ring 21 is contracted inward and removed from the groove 13. Next, the cover 30 is removed from the casing 10, and the reduction gear 20 is inspected and repaired.

As described above, according to the first embodiment, after the outer peripheral surface of the cover 30 for the speed reducer is fitted to the inner peripheral surface of the casing 10, the groove 13 provided on the inner peripheral surface of the casing 10 is formed. A metal ring 21 is attached to the casing 10 and the bottomed holes 10a and 30a are provided across the surfaces of the casing 10 and the cover 30, and the bottomed holes 10a and 30a are provided.
Since the stopper 22 is attached to a, the cover 30 can be easily attached and detached as compared with the case using screws. Further, since threading is not required, the processing cost can be reduced, the thickness of the flange can be reduced, and the device can be reduced in size and weight. Further, the mounting state of the metal ring 21 and the top 22 can be checked from the outside, and assembly errors and the like are prevented.

Second Embodiment FIG. 5 is a sectional view showing a mounting structure of a speed reducer cover according to a second embodiment of the present invention, and corresponds to FIG. 3 of the first embodiment. FIG. In FIG. 5, the same portions as those in FIG. 3 are denoted by the same reference numerals, and the differences will be mainly described below. The difference between the second embodiment and the first embodiment is the shape of the detent top. As shown in FIG. 5, the top 24 of the second embodiment is formed in a thin plate shape, and is loosely fitted on the inner side of the metal ring 21. Therefore, in the second embodiment, the metal ring 21 and the top 24 are separate bodies, and the metal ring 21 also functions as a stopper for the top 24.

As described above, according to the second embodiment, the metal ring 21 and the top 24 are separated from each other, and the top 24 is inserted into the back side of the metal ring 21. In addition to the shape, the notch 21a of the metal ring 21 is not required, and the processing cost is reduced.

As described above, according to the present invention, the ring 21 for retaining and the top 2 for preventing rotation are used without using screws.
It is characterized in that the cover 30 is fixed to the casing 10 using 2, 24, and the present invention is not limited to the above-described embodiment, but can be implemented in various forms. For example, in the above-described embodiment, the present invention is applied to the traveling speed reducer cover 30. However, the present invention can be similarly applied to anything other than traveling. Further, the metal ring 21 for retaining is not required over the entire circumference, and may be, for example, half or more. Further, the cross-sectional shape of the metal ring 21 may be other than circular.
Furthermore, the metal ring 21 and the pieces 22, 24 may be integrally joined by welding or the like.

In the correspondence between the above-described embodiment and the claims, the tops 22 and 24 serve as the detent members by the metal ring 2.
Reference numerals 1 each constitute a retaining member.

[0022]

As described above in detail, according to the present invention, the notch formed on the inner peripheral surface of the open end face of the casing and the notch formed on the outer peripheral face of the reduction gear cover coincide with each other. In addition to providing a detent member in the cavity, the concave member formed in the inner peripheral surface of the casing in the circumferential direction abuts the outer peripheral surface edge of the cover in the peripheral direction, and the detent member is traversed by the detent member. Since it is interposed, it is not necessary to thread a cover on the casing or the cover, and the cover can be easily attached to and detached from the casing.

[Brief description of the drawings]

FIG. 1 is an external view of a reduction gear cover mounting device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view (a cross-sectional view taken along the line II-II in FIG. 1) of the reduction gear cover mounting device according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a part a in FIG. 2;

FIG. 4 is an external view of a hydraulic shovel having a reduction gear cover mounting device according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a reduction gear cover mounting device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Casing 10a, 30a Circular hole 13 Groove 20 Principal gear 21 Metal ring 22, 24 frames 30 Cover 41 Lower traveling body 43 Reduction gear for traveling

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D015 AA00 3J063 AA15 AB12 AB44 AC01 BA01 BB02 BB19 BB27 BB46 CA01 CB41 CD46 CD67 XA05 XA12

Claims (3)

[Claims] 1. A cylindrical casing in which a gear mechanism that rotates in conjunction with a hydraulic motor is housed, and is detachably fitted to an inner peripheral surface of the casing to cover an open end surface of the casing. A mounting device for a speed reducer cover comprising a disk-shaped cover for sealing the inside thereof, wherein notches formed on an inner peripheral surface of an open end surface of the casing and an outer peripheral surface of the cover, respectively, A detent member provided in an empty space formed by matching the parts with each other; and a recess formed in a circumferential direction on an inner circumferential surface of the casing, and a circumferentially extending portion on an outer circumferential surface edge of the cover. An attachment device for a reduction gear cover, comprising: an arc-shaped stopper member that abuts and crosses the rotation stopper member. 2. A cylindrical casing, which is provided on the left and right sides of the traveling body of the vehicle and houses therein a traveling speed reducer for transmitting rotation from a traveling hydraulic motor to a drive shaft, and an inner peripheral surface of the casing. A reduction gear cover mounting device comprising a disc-shaped cover that is detachably fitted and covers the open end surface of the casing to cover the open end surface thereof, wherein the inner peripheral surface of the open end surface of the casing and the cover Notch portions respectively formed on the outer peripheral surface, a detent member provided in a space formed by matching the notch portions with each other, and a concave portion formed in an inner peripheral surface of the casing in a circumferential direction. A reduction gear cover, wherein the reduction gear cover is provided with an arc-shaped retaining member that abuts an outer peripheral surface edge of the cover in a circumferential direction and crosses the rotation preventing member. Mounting device. 3. The mounting device for a reduction gear cover according to claim 1, wherein the rotation preventing member and the retaining member are integrated.