JPH10203436A - Vehicle for earth work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a coagulation and wear phenomenon generated on a planetary gear train of its final reduction gear part during the excavation work by providing an oil groove for keeping the lubrication oil in a reverse tooth profile among the gears of the final reduction gear part. SOLUTION: Oil grooves 16a, 16b for feeding the lubrication oil are formed in at least one of reverse side tooth profile 7a of a sun gear 7. A large number of oil grooves 16a are formed along the tooth width direction of the tooth profile and several oil grooves 16b are formed in the tooth depth direction by connecting the oil grooves to each other in the tooth width direction, and the lubrication oil is kept by these oil grooves. When a traveling body is stopped during the excavation work of the ground, etc., the lubrication oil fed during the normal operation is kept in the oil grooves 16a, 16b because there are the oil grooves for feeding the lubrication oil in a reverse tooth profile 7a, and the excellent lubrication condition is kept to prevent generation of the coagulation and wear phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthworking vehicle having an earthworking implement for excavating earth and sand.

[0002]

2. Description of the Related Art An earthworking vehicle is provided with an earthworking implement for excavating earth and sand in front of the vehicle. During traveling, the drive wheels are transmitted from the engine to the endless track or the drive wheels via a speed change steering unit with a brake and a final reduction unit including a planetary gear train and a parallel gear train. On the other hand, during work such as excavation, the earthwork implement is repeatedly operated in the front-rear direction while the vehicle is stopped, but at this time, the brake of the gearshift steering unit is operated to join the vehicle body with the earthwork implement attached. Prevent the vehicle body from moving due to the reaction force.

[0003]

When the vehicle is stopped and the work is being performed, the connection between the final reduction gear and the speed change gear is fixed so as not to move as described above. On the other hand, since the external force applied to the earthworking implement tries to rotate the endless track or the drive wheel through the vehicle body, a rotational force is applied to the endless track section or the drive wheel side coupling portion, and the planetary gear train When the gears of the parallel gear train are stopped, the above-mentioned force is applied between the meshing tooth surfaces. Lubricating oil is stored in the lower portion inside the final reduction gear section, and the gears in the lower portion are immersed in the lubricating oil. During normal running, the gears mesh with each other and rotate, so the lubricating oil attached to the lower gear is carried to the upper gear by repeating rotation and meshing, preventing wear on the tooth surface, When an external force is applied in a state where the rotation of the gears is stopped during the operation as described above, the same gears receive the force in a meshed state, and therefore, the tooth surface of the planetary gear train or the parallel gear train. Has a problem in that the adhesive wear phenomenon occurs and damages the tooth surface.

[0004] It is an object of the present invention to provide an earthwork vehicle that prevents the adhesion and wear phenomenon that occurs in the planetary gear train of the final reduction gear section during excavation work.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of controlling the driving force of an engine to an endless track or drive through a traveling transmission mechanism including a speed change steering unit and a final reduction unit. An earthwork work vehicle configured to lock the traveling transmission mechanism during work using the mounted earthwork work tool by traveling by transmitting to a wheel, wherein a gear constituting the final reduction gear unit is provided. The present invention discloses an earthwork vehicle, wherein at least one of them has an oil groove for retaining lubricating oil on a trailing tooth surface.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a schematic view of an earthwork vehicle.
An arm unit 3 including a boom, an arm, and the like is attached to the front side of the vehicle body 2 so as to be rotatable in the front-rear direction. An earthworking work tool, for example, a bucket 3 a is connected to the tip of the arm unit 3. FIG. 3 shows the traveling mechanism of the earthwork vehicle, and the driving force (rotational force) of the engine 4 is shown.
Is transmitted to the endless track zone of the traveling body 1 via the speed change steering unit with brake 5 and the final reduction gear units 6 arranged on both sides thereof.

FIG. 4 shows the structure of the final reduction gear section 6.
A planetary gear train 11 composed of a sun gear 7, a planetary gear 8, a carrier 9, a ring gear 10 and the like;
a, a parallel gear train 12 composed of a small gear train 12b, and an output shaft 13. The output from the planetary gear train 11 is transmitted to the endless track zone of the traveling body 1 via the sprocket 14. Lubricating oil 15 is filled in the lower part of the final reduction gear unit 6, and the lubricating oil is supplied to each gear as the gear rotates.

FIG. 1 shows an example of the shape of the tooth surface of the sun gear 7 which is a feature of the present invention. Oil grooves 16a and 16b for supplying lubricating oil are formed in the reverse tooth surface 7a. Oil groove 1
6a are formed along the tooth width direction of the tooth surface,
b are formed in the tooth height direction by connecting oil grooves in the tooth width direction, and oil is held by these oil grooves.

The operation of the earthwork vehicle having the sun gear having the above-described shape will be described below. During normal traveling, the driving force from the engine 4 is transmitted to the endless track zone of the traveling body 1 via the transmission steering unit 5, the final reduction unit 6, the sprocket 14, and the like, and the vehicle travels. At this time, the planetary gear train 1
Since the gear 1 and the parallel gear train 12 are rotating, the lubricating oil 15 in the case is supplied, and good lubrication is obtained on the tooth surfaces of the sun gear 7, the planetary gear 8 and the like, and the adhesion and wear phenomenon does not occur. . On the other hand, during excavation work on the ground or the like, the traveling body 1 is stopped. Then, the bucket 3 a of the work implement for earthwork is repeatedly operated in the front-rear direction via the arm unit 3. At this time, a digging force F1 in the illustrated arrow direction A is applied to the bucket 3a as shown in FIG. Therefore, the traveling body 1
In order to keep the gears stopped, it is necessary to
, It is necessary to apply a counterforce F2 to the sprocket 14 in the direction indicated by arrow B in FIG. For this,
The opposing force F2 is also applied to the reverse tooth surface 7a of the sun gear 7 of the planetary gear train 11. At this time, the sun gear 7 is stopped, and the meshing point with the planetary gear 8 that meshes with the gear 7 always uses the same point without lubricating oil being supplied. Therefore, in the past, the oil film was cut off on the reverse tooth surface 7a, and the adhesion and wear phenomena 17, 17,... Were likely to occur on the reverse tooth surface as shown in FIG. However, if the oil groove 16 for supplying the lubricating oil is formed on the reverse tooth surface 7a as shown in FIG. 1, the lubricating oil supplied with the rotation of the gear during the normal operation such as the forward or backward movement is used. 16
Since it is held at a and 16b, a good lubricating state is maintained and the occurrence of the adhesion and wear phenomenon can be prevented.

FIG. 6 shows another example of the shape of the oil groove.
A recess 16 provided near the center of the reverse tooth surface 7a of the sun gear 7
d (groove on the ellipse) and oil groove 1 extending from the groove in the tooth width direction
6c, 16c,... Are provided for holding the lubricating oil. Further, the oil grooves 16c, 16c,... In the tooth width direction are not parallel, but are arranged so that the intervals at both ends are narrow along the tooth width direction, and the oil grooves 16c become wider toward the central recess 16d. According to this shape example, the lubricating oil supplied to the tooth surface toward the recess 16d collects regardless of whether the reverse tooth surface 7a is above or below the sun gear 7 with the rotation of the sun gear 7, so that the vehicle The retention efficiency of the lubricating oil during stoppage is improved.

FIG. 7 shows still another example of the shape of the oil groove. An elliptical groove 16e is formed at a position where the sun gear is likely to cause cohesive wear, that is, at a position closer to the tooth root than the pitch point.
A single or a plurality of them are arranged side by side, where the oil is held to prevent cohesive wear. According to this configuration, there is an advantage that the formation of the oil groove is simple.

In the above description, the gear provided with the oil groove on the advancing tooth surface has been described as the sun gear 7, but it is apparent that this is also effective when applied to other gears constituting the final reduction gear section. .

[0013]

According to the earthworking vehicle of the present invention, since the oil groove for supplying the lubricating oil is formed on the rearward tooth surface of the gear constituting the final reduction gear section, adhesion wear generated during earthworking. This has the effect of preventing the phenomenon and reducing damage to the tooth surface.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a shape of an oil groove on a reverse tooth surface of a gear which is a feature of the present invention.

FIG. 2 is a schematic diagram of an earthwork vehicle.

FIG. 3 is a diagram showing a driving mechanism.

FIG. 4 is a diagram showing a configuration of a final reduction gear unit.

FIG. 5 is an explanatory diagram of an adhesive wear phenomenon occurring on a tooth surface.

FIG. 6 is a diagram showing another example of the shape of the oil groove.

FIG. 7 is a view showing still another example of the shape of the oil groove.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 traveling body 2 body 3 arm unit 3a bucket 5 speed change steering unit 6 final reduction unit 7 sun gear 7a reverse gear 8 planetary gear 10 ring gear 11 planetary gear train 12 parallel gear train 15 lubricating oil 16a to 16e oil groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Maezawa 4-13-17 Nakagawa, Adachi-ku, Tokyo Hitachi Techno Engineering Co., Ltd. (72) Inventor Masaaki Komatsubara 603, Kandamachi, Tsuchiura-shi, Ibaraki Japan Tachiura Factory

Claims (5)

[Claims] An engine driving force is transmitted to an endless track or a drive wheel via a traveling transmission mechanism including a speed change steering unit and a final reduction gear unit, and the vehicle is driven. An earthworking vehicle configured to lock the traveling transmission mechanism at the time of operation, wherein at least one of the gears constituting the final reduction gear unit, and then the lubricating oil holding surface An earthwork vehicle having an oil groove. 2. The earthwork vehicle according to claim 1, wherein the gear provided with the oil groove is a sun gear. 3. The groove according to claim 1, wherein the oil groove is formed by a groove in a width direction of the reverse tooth surface and a groove in a height direction orthogonal to the groove in the width direction. The described earthwork vehicle. 4. The oil groove is formed such that an elliptical groove at the center of the reverse tooth surface and an interval from the elliptical groove toward an end in the face width direction and closer to the end are spaced from each other. The earthwork vehicle according to claim 1 or 2, wherein the vehicle is formed from a plurality of widened grooves. 5. The oil groove according to claim 1, wherein the oil groove is formed by one or a plurality of elliptical grooves provided on the root side of a pitch point of the reverse tooth surface. 6. An earthwork vehicle according to claim 1.