JP3149603U - Axle structure of industrial vehicle - Google Patents

Abstract

The present invention provides an axle structure for an industrial vehicle that does not require a special part such as a dust cover, is not reworked, and has excellent ease of assembly. SOLUTION: An axle 2, a wheel 10 that rotates together with the axle 2 and a tire 10 is attached, a planetary gear mechanism 3 connected to the axle 2, and a reduction gear 4 coupled to the planetary gear mechanism 3 are provided. A bearing 20 that rotatably supports the reduction gear 4 and a retainer 21 that supports the bearing 20 are provided. The retainer 21 is configured to extend so that the outer periphery thereof is close to the wheel 10 and to form a minute gap between the retainer 21 and the wheel 10. [Selection] Figure 1

Description

  The present invention relates to an axle structure for an industrial vehicle, and more particularly to an axle structure for an industrial vehicle including a holding means for holding a bearing that rotatably supports a reduction gear.

In general, in an industrial vehicle such as a forklift, an axle structure including a mission cover that rotatably supports an axle and a wheel to which a rotating tire is attached is provided. In an environment where work is performed by such an industrial vehicle, a string or a string-like object (hereinafter referred to as “string or the like” together) may be dropped on a road surface on which the vehicle travels.
In such a case, a string or the like lifted from the road surface via the tires of an industrial vehicle traveling on the road surface enters the inside of the wheel, and the mission cover that rotatably supports the axle and the axle as it is. May get caught in between. When such a state occurs, there is a risk of damaging the oil seal that seals the oil of a mechanism such as a rolling bearing that rotatably supports the axle. In particular, in a work environment in which strings and the like are likely to be scattered on the traveling road surface, the possibility that the strings and the like are caught on the axle is extremely high.

In order to prevent a string or the like from being caught on an axle, for example, an industrial vehicle axle structure shown in Patent Document 1 has been proposed. As shown in FIG. 4, an axle structure 51 for an industrial vehicle includes an axle 52, a planetary gear mechanism 53 for reducing rotation to the axle 52, and rotation from a motor (not shown) to the planetary gear mechanism 53. It is composed of a reduction gear 54 for transmission.
A hub 55 is fixed to the axle 52 and is rotatably supported by a transmission case 57 via a rolling bearing 56. An oil seal 58 for sealing oil for the rolling bearing 56 is provided between the mission case 57 and the hub 55. A wheel 60 to which a tire 59 is attached is fixed to the hub 55 with bolts 61.
On the other hand, the planetary gear mechanism 53 is composed of a central sun gear 62, a plurality of planetary gears 63 and an outer internal gear 64, and the axle 52 is connected to the planetary gear 63 via a planetary carrier 65. . The sun gear 62 is formed integrally with the reduction gear 54, and the rotation of the reduction gear 54 is input from the sun gear 62 to the planetary gear mechanism 53. Therefore, the rotation from the motor is transmitted from the reduction gear 54 to the sun gear 62 of the planetary gear mechanism 53, and from the planetary gear 63 to the axle 52 through the planet carrier 65, and the axle 52 rotates. Then, the rotation of the axle 52 is transmitted to the hub 55 and transmitted to the wheel 60 and the tire 59.
A groove 66 is provided on the outer periphery of the internal gear 64 of the planetary gear mechanism 53, and an arc-shaped dust cover 67 is attached to the groove 66. This dust cover 67 is formed by fastening two semicircular arc-shaped parts with bolts (not shown), and a rubber 68 is provided on the outer periphery of the dust cover 67.
The dust cover 67 serves to fill a gap between the wheel 60 and the internal gear 64, thereby preventing the string or the like from entering the inner side P of the wheel 60, and the string or the like is caught in the axle 52. Is prevented.

JP 2006-176044 A

  However, in the industrial vehicle axle structure 51 shown in FIG. 4, a dust cover 67 is specially provided as a part for preventing a string or the like from entering the inner side P of the wheel 60, and the dust cover 67 is fixed. In addition, a groove 66 is provided on the outer periphery of the internal gear 64 of the planetary gear mechanism 53. Since the processing of the groove 66 is performed after the processing of the teeth of the internal gear 64 is completed, the internal gear 64 may be deformed by the processing of the groove 66 and the meshing with the planetary gear 63 may be deteriorated. If the meshing is worsened, the transmission efficiency of the gear is reduced and abnormal noise is generated. In some cases, it is necessary to rework the teeth of the internal gear 64 after machining the grooves 66. There was a problem of becoming. Moreover, the assembly of the dust cover 67 is a configuration in which a semicircular arc-shaped part is fastened and attached with a bolt, and there is a problem that it takes time to assemble.

  The present invention has been made in view of the above-mentioned problems. The purpose of the present invention is to prevent special parts such as dust covers and internal gears from being processed in order to prevent the string or the like from getting caught in the axle. The present invention provides an axle structure for an industrial vehicle that does not require reworking and is excellent in ease of assembly of the axle structure.

  To achieve the above object, a mission cover that rotatably supports an axle, a wheel that rotates together with the axle and has a tire attached thereto, a planetary gear mechanism that is connected to the axle, and a planetary gear mechanism that is coupled and driven. An axle structure for an industrial vehicle, comprising: a reduction gear that transmits rotation from a portion; a bearing that rotatably supports the reduction gear; and a disk-like holding means that holds the bearing, and an outer periphery of the holding means Is extended close to the wheel, and a small gap is formed between the holding means and the wheel.

According to the first aspect of the present invention, the outer periphery of the holding means for holding the bearing extends close to the wheel, and a small gap is formed between the holding means and the wheel so that the string or the like is The holding means has a function of preventing entry into the inside. Thereby, since it is not necessary to newly provide special parts like a dust cover, the increase in the number of parts can be suppressed.
In addition, since it is not necessary to rework the processing as in the prior art, and no work for assembling the dust cover is required, the assemblability is excellent.

  The invention described in claim 2 is the invention described in claim 1, characterized in that the outer periphery of the holding means has a shape corresponding to the shape of the end of the wheel.

  According to the second aspect of the present invention, since the outer periphery of the holding means has a shape corresponding to the shape of the end of the wheel, the gap between the holding means and the end of the wheel has a complicated shape. Thereby, entering to the inside of wheels, such as a string, can be blocked more effectively.

  Invention of Claim 3 is an invention of Claim 1 or Claim 2, Comprising: Protrusion part is provided in the said mission cover, a protrusion part is extended near the wheel, The said protrusion part, wheel, It is characterized by a minute gap between the gaps.

  According to the invention of claim 3, by providing a new projecting portion on the mission cover, even if the string or the like passes between the holding means and the wheel for some reason and enters the inside of the wheel, the projecting portion By forming a small gap between the wheel and the wheel, it is possible to prevent further entry of the string or the like into the wheel and prevent the string or the like from being caught on the axle. Thus, by providing the holding means and the protruding portion, it is possible to more firmly prevent the string and the like from entering the inside of the wheel in two stages.

  According to the present invention, since the holding means for holding the bearing has a function of preventing the string and the like from entering the inside of the wheel, a special part for preventing the string and the like from entering the inside of the wheel is provided. It is not necessary and the increase in the number of parts can be suppressed. In addition, there is no need for reworking, and the assembly of the axle structure is excellent.

It is sectional drawing which shows the axle structure of the industrial vehicle which concerns on the 1st Embodiment of this invention. It is an enlarged view which shows the principal part of the axle structure of the industrial vehicle which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the axle structure of the industrial vehicle which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the axle structure of the industrial vehicle which concerns on a prior art.

(First embodiment)
Hereinafter, the axle structure of the industrial vehicle in 1st Embodiment is demonstrated based on FIG. 1, FIG. This embodiment shows an example applied to a forklift as an industrial vehicle.
As shown in FIG. 1, the axle structure 1 of a forklift decelerates rotation from an axle 2, a planetary gear mechanism 3 that decelerates rotation on the axle 2, and a motor (not shown) as a drive unit. The reduction gear 4 is transmitted to the gear mechanism 3.
The axle 2 is provided with an annular hub 5, and the axle 2 and the hub 5 are rotatably supported with respect to the mission cover 7 by two rolling bearings 6 that support the hub 5. The rolling bearing 6 is supplied with oil for lubrication, and an oil seal 8 for sealing the oil is provided between the hub 5 and the mission cover 7 in the vicinity of the rolling bearing 6.
A hub flange 9 extending in the radial direction is provided on the front end side of the axle 2 of the hub 5, and the hub 5 and the wheel 10 are fixed to the hub flange 9 by bolts 11. The wheel 10 includes a disk 12 that is fixed to the hub 5 with bolts 11, a rim 14 that holds the tire 13, and a flange 15 that is provided at an end of the rim 14.

Next, the planetary gear mechanism 3 will be described.
The planetary gear mechanism 3 is fixed to the mission cover 7 with a sun gear 16 positioned at the center of the planetary gear mechanism 3, a plurality of planetary gears 17 that revolve and rotate around the sun gear 16, and the planetary gear mechanism. 3 and an internal gear 18 in which teeth that mesh with the planetary gear 17 are formed. In the planetary gear mechanism 3, the planetary gear 17 is rotatably attached to the planet carrier 19, and is connected to the axle 2 via the planet carrier 19. On the other hand, the sun gear 16 is coupled to the reduction gear 4, and rotation from the motor to the reduction gear 4 is transmitted from the sun gear 16 to the planetary gear mechanism 3.

Here, the sun gear 16 and the reduction gear 4 are not integrally formed as in the prior art, and the sun gear 16 and the reduction gear 4 have a separate structure. The shaft of the sun gear 16 and the shaft of the reduction gear 4 are coupled by a spline (hereinafter referred to as spline coupling S), whereby the rotation of the reduction gear 4 is transmitted to the sun gear 16.
In this way, the sun gear 16 and the reduction gear 4 are allowed to move relative to each other in the axial direction of the gears 16 and 4 by spline coupling S between the sun gear 16 and the reduction gear 4. Thereby, the external force in the axial direction from the tire 13 is transmitted to the wheel 10, the hub 5, the axle 2, and the planetary gear mechanism 3, but is prevented from being transmitted to the reduction gear 4 and the motor by the spline coupling S. Is done.
And since the axis | shaft of the sun gear 16 and the reduction gear 4 was made into the spline coupling | bonding S in this way, the bearing 20 is provided between the planetary gear mechanism 3 and the reduction gear 4. FIG. The reduction gear 4 is rotatably supported by the bearing 20. Further, a retainer 21 as a holding means is provided on the outer periphery of the bearing 20 in order to hold the bearing 20. The retainer 21 is fixed to the housing 23 and the internal gear 18 by pins (not shown) and bolts (not shown).
Since the retainer 21 has a structure in which the reduction gear 4 and the sun gear 16 are separated as described above, the bearing 20 that rotatably holds the reduction gear 4 is required, and is provided to hold the bearing 20. .

Next, the shape of the retainer 21 will be described.
The retainer 21 has a disk shape in which a hole 22 for passing the shaft of the reduction gear 4 and the shaft of the sun gear 16 is provided at the center, and a bearing holding portion 24 for holding the bearing 20 is provided on the circumference of the hole 22. Is provided. On the other hand, as shown in FIG. 2, the outer periphery of the retainer 21 extends radially outward so as to be close to the wheel 10, and specifically between the retainer 21 and the wheel 10, specifically, the outer periphery of the retainer 21 and the wheel. The gaps between the flanges 15 as the end portions of the 10 are formed so as to form a minute gap. Therefore, the inner side P of the wheel 10 is covered and closed by the retainer 21 because the retainer 21 extends.
Here, the minute gap between the retainer 21 and the wheel 10 means that the retainer 21 and the wheel 10 (flange 15) do not come into contact with each other, and a string or string-like shape is formed between the retainer 21 and the wheel 10. This means an interval through which an object (string or the like) cannot pass. Therefore, the string or the like is prevented from entering the inner side P of the wheel 10 by such a minute gap.
Further, the outer periphery of the retainer 21 has a shape corresponding to the flange 15, that is, a shape following the shape of the flange 15. Specifically, the outer periphery of the retainer 21 includes an arc portion 26 shaped like the arc portion 25 of the flange 15 and a vertical portion 28 following the flange end portion 27.
Thus, by making the shape of the outer periphery of the retainer 21 follow the shape of the flange 15, the space between the retainer 21 and the wheel 10 is configured with a minute gap and a complicated shape. Furthermore, by making the retainer 21 and the flange 15 have a complicated shape, it becomes more difficult for the string or the like to pass through the gap between the retainer 21 and the wheel 10.
The shape of the outer periphery of the retainer 21 is simultaneously formed by cutting or the like when forming the hole 22 or the bearing holding portion 24 when the retainer 21 is processed.

As described above, according to the axle structure 1 of the forklift of the present embodiment, the shape of the retainer 21 necessary for holding the bearing 20 is extended so as to be close to the wheel 10, and the space between the retainer 21 and the wheel 10 is extended. Is configured to be a minute gap.
For this reason, when the forklift travels in an environment where the strings are scattered on the road surface, even if the strings lifted from the road surface via the tires 13 etc. reach the vicinity of the housing 23 or the wheel 10, A path through which the string or the like enters the inner side P of the wheel 10 is covered with the retainer 21 and is closed. Thereby, even if a string or the like lifted from the road surface via the tire 13 or the like wraps around the housing 23 side, the string or the like is prevented from entering the inner side P of the wheel 10 because it is blocked by the retainer 21. . Accordingly, the string or the like can be prevented from being caught on the axle 2, and the oil seal 8 is not damaged by the string or the like.

The first embodiment has the following effects.
(1) Since the retainer 21 for holding the bearing 20 has a function of preventing the string or the like from entering the inner side P of the wheel, a special part such as a dust cover is newly provided as in the prior art. There is no need. Therefore, an increase in the number of parts can be suppressed.
(2) Since the retainer 21 for holding the bearing 20 has a function of preventing a string or the like from entering the inner side P of the wheel 10, there is no troublesome work of assembling the dust cover as in the prior art. Excellent assemblability of structure.
(3) The shape of the outer periphery of the retainer 21 can be processed simultaneously when the retainer 21 is processed. Therefore, there is no need to rework after a new process such as forming a groove for attaching the dust cover or the internal gear 18 is processed.
(4) An arc portion 26 and a vertical portion 28 are provided on the retainer 21 so that the outer periphery of the retainer 21 follows the shape of the flange 15. Thereby, the shape of the space between the retainer 21 and the flange 15 (the end of the wheel 10) becomes complicated, and the string or the like can be made difficult to pass between the retainer 21 and the wheel 10. As a result, it is possible to effectively prevent a string or the like from entering the inner side P of the wheel 10.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
In this embodiment, the shape of the mission cover is changed with respect to the industrial vehicle axle structure 1 of the first embodiment, and a flange-shaped protrusion 30 whose end is close to the wheel 10 is provided on the mission cover 29. ing. The projecting portion 30 is configured to form a minute gap on the inner peripheral surface of the wheel 10 (rim 14).
Here, the minute gap between the protruding portion 30 and the inner peripheral surface of the wheel 10 means that the protruding portion 30 and the wheel 10 do not come into contact with each other, and a string or the like is formed between the protruding portion 30 and the wheel 10. It means an interval that cannot be passed.
Thus, by newly providing the projecting portion 30 on the inner side P of the wheel 10 in the mission cover 29, even if a string or the like passes between the wheel 10 and the retainer 21, the projecting portion 30 causes the projecting portion 30. By making the space between the wheel 10 and the wheel 10 minute, it is possible to prevent the cord or the like from further entering the front end side of the axle 2, and reliably prevent the cord or the like from being caught in the axle 2.
Further, since the projecting portion 30 is also formed at the same time by cutting when the mission cover 29 is formed, new processing or reworking does not occur.

The second embodiment has the following effects in addition to the effects of the first embodiment.
(5) The projecting portion 30 is provided on the mission cover 29, and a minute gap is formed between the projecting portion 30 and the wheel 10. Thereby, it is possible to prevent the string or the like from further entering the front end side of the axle 2 on the inner side P of the wheel 10 due to a minute gap between the protruding portion 30 and the wheel 10.
Thereby, it is possible to prevent the string from entering the inner side P of the wheel 10 more firmly in two stages together with the minute gap between the retainer 21 and the wheel 10.
(6) The shape of the protrusion 30 of the mission cover 29 can be processed simultaneously when the mission cover 29 is processed. Therefore, new processing such as forming a groove for attaching the dust cover and reworking are not required.

In the said 1st, 2nd embodiment, it is not limited above, You may change as follows.
In the second embodiment, a protrusion is provided on the mission cover so that the gap between the protrusion of the mission cover and the wheel is a minute gap. However, the protrusion has a minute gap between the wheel and the retainer. A new part may be provided. In this way, by providing the retainer with another member that forms a minute gap with the wheel, the structure of the retainer's outer periphery and the protruding portion prevents the string from entering the wheel. can do.
In the first and second embodiments, an example of an axle structure of a forklift has been described. However, the invention can be applied to an industrial vehicle having a member corresponding to a retainer, such as a towing vehicle or a construction machine.

DESCRIPTION OF SYMBOLS 1 Axle structure 2 Axle 3 Planetary gear mechanism 4 Reduction gear 7 Mission cover 10 Wheel 13 Tire 20 Bearing 21 Retainer (holding means)
29 Mission cover 30 Projection

Claims (3)

A mission cover that rotatably supports the axle,
A wheel that rotates with the axle and to which a tire is attached;
A planetary gear mechanism connected to the axle;
A reduction gear coupled to the planetary gear mechanism and transmitting rotation from a drive unit;
A bearing that rotatably supports the reduction gear;
An axle structure of an industrial vehicle comprising a disk-shaped holding means for holding the bearing,
An axle structure for an industrial vehicle, wherein an outer periphery of the holding means is extended close to the wheel, and a minute gap is formed between the holding means and the wheel.   2. The axle structure for an industrial vehicle according to claim 1, wherein an outer periphery of the holding means has a shape corresponding to a shape of an end portion of the wheel.   3. The industrial vehicle according to claim 1, wherein a protrusion is provided on the mission cover, the protrusion extends close to the wheel, and a minute gap is formed between the protrusion and the wheel. Axle structure.