JPH0771568A - Bearing fixing device for planetary gear reducer - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to securely mount the bearing. [Constitution] Bearing surface 1a of casing 1 and sprocket 2
The bearings 3, 3 are provided between the casing 1 and the bearing surface 2a of the casing 1.
In the planetary gear reducer for rotating the sprocket 2 by connecting the end portion 1b having a reduced diameter from the bearing surface 1a of the above with the carrier 4 of the planetary gear reducer by the spline 5 and the casing 1
A groove 6 is provided on the bearing end portion of the bearing surface 1a of the carrier 4, and a half plate 7 that abuts and engages with the bearing 3 is fitted into the groove 6 to prevent the carrier plate 4 from coming off on the side facing the bearing 3. The protrusion 4a is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear reducer used for driving a tracked vehicle, and more particularly to a bearing fixing device for a planetary gear reducer.

[0002]

2. Description of the Related Art Generally, in a tracked vehicle such as a hydraulic excavator, for example, as shown in FIG.
A step planetary gear reducer 12 is used. The installation position is directly connected to the hydraulic motor 11 serving as a drive source installed in the casing 13 so as to rotate at a reduced speed. On the outside of the housing 14 of the two-step planetary gear reducer 12, there is a sprocket 15 which is integrated by fastening, and when the two-step planetary gear reducer 12 is rotated, the teeth of the sprocket 15 mesh with the crawler belt 16 and the Since it is driven to rotate, the vehicle can run. The two-stage planetary gear reducer 12 is attached to the track frame 16 with bolts 17 via the casing 13.

The structure of the two-stage planetary gear reducer 12 will be briefly described. A sun gear shaft 19 is connected to a bearing 18 of the hydraulic motor 11 by a coupling 20, and a sun gear shaft 19 has a shaft end at a first stage sun gear. 21 is provided. First stage planetary gear 22 that meshes with first stage sun gear 21
Is supported by the first-stage carrier 23 and also meshes with the internal gear ring gear 24 of the cylindrical housing 14. The first-stage carrier 23 is connected to a second-stage sun gear 25 provided around the first-stage sun gear shaft 19 by a spline 26. The second stage sun gear 25 meshes with the second stage planetary gear 30,
The second stage planetary gear 30 is supported by the second stage carrier 29. The second stage carrier 29 is the casing 1
The bearing 13 is connected to a bearing pressing plate 27 attached to the end of the shaft 3 by means of a spline 28 and is integrated with the casing 13. The second stage planetary gear 30
Engages with the internal gear ring gear 24 to rotate the housing 14, which is a rotating body, by two stages of deceleration.

The housing 14 is the housing 14.
The support member 32, which is connected to the bolt 31 by the bolt 31, is integrally rotated. The support member 32 has an inner peripheral portion rotatably supported around the casing 13 via a bearing 33, and a sprocket 15 that engages with the crawler belt 16 and is driven to travel is attached to the outer peripheral portion with bolts 34. ing. In the figure, 35 is a floating seal,
Reference numeral 36 is a cover attached to the outermost end of the housing 14 by the bolt 34.

In the two-stage planetary gear reducer 12 constructed as described above, in order to hold the bearing 33 rotatably supporting the support member 32 having the sprocket 15 mounted on the outer periphery thereof, for example, FIG. As shown in an enlarged view of P part, the end face of the casing 13 is brought into contact with the pressing plate 27 having the outer periphery connected to the two-stage carrier 29 and the spline 28, and the shim 37 is provided in the gap with the bearing 33 to adjust the axial dimension. Or,
Alternatively, as shown in FIG. 5 (disclosed in Japanese Utility Model Laid-Open No. 62-34247), a stopper 44 spline-joined to the fixing member 42 and the carrier 43 on which the bearing 41 is fitted. (The same function as the pressing plate 27 in FIG. 4) is provided, and the stopper 44 is fastened to the nut 4
There is a type in which the nut 45 is tightened and the nut 45 is prevented from being loosened by the bolt 46 and held.

As a technique for fixing the bearing with a snap ring, there is Japanese Utility Model Laid-Open No. 4-1710.

[0007]

However, in the former case, the shim 37 needs to be adjusted, and at the same time, the pressing plate 2 is required.
To attach 7, it is necessary to tighten bolts 38. In the latter case, it is difficult to thread the large-diameter nut 45, and at the same time, a large space is required to mount the nut 45.

Further, the casing 13 shown in FIGS.
When the spline 28 of the carrier 29 and the carrier 29 is connected, the pressing plate 2 attached to the inner peripheral surface of the portion protruding from the outer peripheral surface of the carrier 29 to the casing 13 side and the end surface of the casing 13.
Since the spline 28 engages with the outer peripheral surface of the planetary gear 7, there is a problem that the planetary gear reducer 12 becomes long and cannot be made compact. Further, there is a problem that the end of the planetary gear reducer 12 is located substantially at the same position as the end of the crawler belt 16 and the planetary gear reducer 12 is damaged due to a collision of rock or the like during work.

Further, as shown in FIG. 7, the main parts of the above Japanese Utility Model Laid-Open No. 4-1710 are shown in FIG.
It consists of a carrier 52, a snap ring 53, and a bearing 54, and the carrier 52 and the casing 51 are splines 55.
The bearing 54 on the casing 51 is fixed by a snap ring 53 provided between the casing 52 and the carrier 52, and the carrier 5 prevents the snap ring 53 from falling off.
This is done by the recess 52a provided on the end face of No. 2. In the figure, 56 is a housing. However, in this case, since the snap ring used is large in size, it is very difficult to attach and detach, and at the same time, it has a drawback that it is easily detached.

The present invention provides a bearing fixing device for a planetary gear reducer, which makes it possible to easily fix the bearings in both the first and second inventions, and particularly in the second invention, in which the reduction gear case is made compact. Then, the purpose is to eliminate the drawbacks of the conventional technology.

[0011]

In order to achieve the above object, a bearing fixing device for a first planetary gear reducer according to the present invention comprises a hydraulic motor, a casing in which the hydraulic motor is fitted, and a hydraulic motor. And a casing for transmitting power to the sprocket via a planetary gear reducer, and by spline coupling the outer peripheral side of the casing in which the hydraulic motor is fitted and the inner peripheral side of the final stage carrier, The carrier is fixed so that the sprocket can be rotationally driven,
A bearing is provided between the both casings, and a bearing movement preventing member is provided between the end of the bearing and the protruding portion of the final stage carrier of the planetary gear reducer.

Further, in the above structure, the movement preventing member is a pair of half-divided plates, and the half-divided plates are held in an annular groove formed in the projecting portion of the final stage carrier and the end portion of the bearing. It is configured to do.

A second planetary gear reducer bearing fixing device according to the present invention includes a hydraulic motor, a casing in which the hydraulic motor is fitted, and a drive force of the hydraulic motor for driving a sprocket through the planetary gear reducer. And a casing that transmits the hydraulic motor is provided, the inner peripheral side of the casing in which the hydraulic motor is fitted and the outer peripheral side of the final stage carrier are spline-coupled, and the carrier is fixed so that the sprocket can be rotationally driven. A bearing is provided between both casings, and a movement preventing member of the bearing is provided between the end of the bearing and the protruding portion of the final stage carrier of the planetary gear reducer.

In the above structure, the movement preventing member is a half plate, and the half plate is held by a fixing ring.

[0015]

According to the first and second aspects of the invention, since the half-divided plate is used to prevent the movement of the bearing of the planetary gear reducer, it is easy to insert it into the groove and the drop-out of the carrier is fixed or fixed. It is prevented by a ring, and the inner or outer peripheral side of the final stage carrier of the planetary gear reducer and the outer or inner peripheral side of the casing in which the hydraulic motor is fitted are spline-coupled. The gear reducer case becomes shorter and compact.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention of the present invention will be described below with reference to an embodiment shown in FIGS. The bearing fixing device for a planetary gear reducer according to the first aspect of the present invention includes a casing 1 in which a hydraulic motor (not shown) is fitted, and a bearing 3 is provided between the bearing surface 1a and the bearing surface 2a of the sprocket 2.
3 is provided. And the bearing surface 1a of the casing 1
The end portion 1b having a smaller diameter is connected to the final stage carrier 4 of the planetary gear reducer by the spline 5 so that the carrier 4 is fixed and the sprocket 2 is rotationally driven. In such a planetary gear reducer, a groove 6 is provided in the bearing end portion of the bearing surface 1a of the casing 1, and the movement preventing member of the bearing 3 that abuts and engages with the bearing 3 (one example Will be described below as a half plate). A protrusion 4a for preventing the half plate 7 from coming off is provided on the side of the carrier 4 facing the bearing 3.

The structure of the planetary gear reducer relating to the present invention has been described in detail with reference to FIG. 6, so the description thereof will be omitted. However, FIG. 1 of the present invention shows the conventional bearings of FIGS. 4 and 5. A cross section of the upper part with a modified circumference is shown. Bearing 3
Is a pair of 3A and 3B, and the inner ring end on the right side of 3A is abutted against the bearing surface 1a of the casing 1 with the larger diameter portion 1c as a shoulder, and the inner ring end on the left side of 3B is the bearing of the bearing surface 1a of the casing 1. It is attached by abutting on a half plate 7 provided in the groove 6 at the end. Also, the outer ring end is sprocket 2
Of the bearing surface 2a.

The casing 1, which is the fixed side, and the final stage carrier 4 (which in the embodiment of FIG. 6 is a two stage carrier due to the two stage planetary gear reducer) are connected by a spline 5. As a result, the rotation of the two-step sun gear (25) shown in FIG. 6 causes the two-step planetary gear (30) to rotate, but since the carrier 4 is fixed, the ring gear (24) rotates and the sprocket of FIG. 2 will rotate. Thus, the bearing 3 is fixed by fitting the half-divided plate 7 mounted in the groove 6 as an intermediate fit so that the bearing 3 can be mounted without play. Further, when the vehicle is traveling, in order to prevent the half plate 7 from floating from the groove 6, the half plate 7 is prevented from floating on the opposite side of the bearing 3 in the radial direction of the carrier 4. Since the drop-out preventing protrusion 4a is provided, there is no possibility that the protrusion 4a floats up and comes out of the groove 6.

Next, the improved bearing fixing device portion of the planetary gear reducer, which is the main part of the second invention, will be described in detail with reference to FIG. A not-shown integrated hydraulic motor is fixed to the fixed casing 61,
The left side is formed in a tubular shape as shown, and the end surface 61b is at a right angle to the outer peripheral surface. The outer peripheral surface is the bearing surface 6
1a, a pair of bearings 63A and 63B are externally fitted, and the sprocket 62 is rotatably attached to the casing 61 via the bearings 63A and 63B.

The right inner ring end of the bearing 63A is mounted so that the larger diameter portion 61c of the casing 61 abuts against the bearing surface 61a of the casing 61, and the left inner ring end of the other bearing 63B is placed on the bearing surface 61a. It is attached at a position corresponding to one of the provided grooves 66. In the groove 66, a pair of arc-shaped half plates 67 that come into contact with and engage with the bearing 63B are attached so as to fit in the radial direction. Therefore, as compared with the conventional snap ring attachment, the attachment and detachment are easier. The outer ring side of both bearings 63A and 63B is on the sprocket 62.
Of the bearing surface 62a and the annular shoulder portion 62c having a diameter smaller than that of the bearing surface 62a.

The half-split plate 67 is fitted in the groove 66 in the middle so that the bearing 63B can be fixed and mounted without play, but a cover is provided on the outer side in the radial direction. Recessed portion 68a to prevent coming off
There is a fixed ring 68 having The fixing ring 68 is fitted from the end of the casing 61 along the bearing surface 61a, and is attached so that the recess 68a presses the outside of the half plate 67. As a result, it is possible to prevent a conventional problem such that the half plate 67 is lifted up when the vehicle is running.

Further, the final stage carrier 64 is provided with an overhanging portion 64a having an appropriate length which is reduced in diameter toward the inner circumferential surface on the casing 61 side. The outer circumferential surface of this overhanging portion 64a and the casing 61 are provided. The inner peripheral surface is connected by a spline 65. With this configuration, the entire length of the planetary gear reducer can be reduced.

[0023]

Since the present invention is constructed as described above, in the first invention, the bearing can be fixed very easily, and there is no fear of falling off. Therefore, the number of parts and the number of assembling steps are reduced as compared with the conventional case.

Further, in the second aspect of the invention, since the length of the planetary gear reducer itself is shortened, the end of the planetary gear reducer is provided close to the outside of the crawler belt as in the conventional case, which causes an obstacle. It is possible to prevent the occurrence of a defect such as collision with an object and damage.

Further, the fixing ring can prevent the half plate which is the fixing device of the bearing from rising.

[Brief description of drawings]

FIG. 1 is a sectional view of an upper half showing an embodiment of a bearing fixing device for a planetary gear reducer according to a first aspect of the present invention.

FIG. 2 is a front view of a half plate which is a main part of FIG.

FIG. 3 is a sectional view of an upper half showing an embodiment of a bearing fixing device for a planetary gear reducer according to a second aspect of the present invention.

FIG. 4 is a cross-sectional view showing a first example of a problem of a bearing fixing device of a conventional planetary gear reducer.

FIG. 5 is a cross-sectional view showing a second example of a problem of the bearing fixing device of the conventional planetary gear reducer.

FIG. 6 is a sectional view showing the structure of a conventional two-stage planetary gear reducer.

FIG. 7 is a cross-sectional view showing a third example of the problem of the bearing fixing device of the conventional planetary gear reducer.

[Explanation of symbols]

1 casing, 1a bearing surface, 1b end part, 2 sprocket, 2a bearing surface, 3A, 3B bearing, 4 final stage carrier, 4a retaining projection, 5 spline, 6 groove, 7 half plate, 61 casing,
61 end face, 61a bearing face, 61b end face, 62 sprocket, 63A, 63B bearing, 64 final stage carrier, 64a overhanging part, 65 spline, 66
Groove, 67 halves, 68 retaining ring.

Claims (4)

[Claims] 1. A hydraulic motor, a casing in which the hydraulic motor is fitted, and a casing for transmitting the driving force of the hydraulic motor to a sprocket via a planetary gear reducer, and the hydraulic motor is fitted in the casing. The outer peripheral side of the casing and the inner peripheral side of the final stage carrier are spline-coupled to each other to fix the carrier so that the sprocket can be rotationally driven. A bearing is provided between the both casings, and an end portion of the bearing is provided. A bearing fixing device for a planetary gear reducer, comprising a bearing movement preventing member provided between the planetary gear reducer and an overhanging portion of the final stage carrier. 2. The movement preventing member is a pair of half-divided plates, and the half-divided plates are held in an annular groove formed in an overhang portion of the final stage carrier and an end portion of the bearing. The bearing fixing device for the planetary gear reducer according to claim 1. 3. A hydraulic motor, a casing in which the hydraulic motor is fitted, and a casing for transmitting the driving force of the hydraulic motor to a sprocket via a planetary gear reducer, and the hydraulic motor is fitted in the casing. The inner peripheral side of the casing and the outer peripheral side of the final stage carrier are spline-coupled to each other so that the carrier can be fixed and the sprocket can be rotationally driven. A bearing is provided between the both casings and an end portion of the bearing is provided. A bearing fixing device for a planetary gear reducer, comprising a bearing movement preventing member provided between the planetary gear reducer and an overhanging portion of the final stage carrier. 4. The bearing fixing device for a planetary gear reducer according to claim 3, wherein the movement preventing member is a half plate, and the half plate is held by a fixing ring.