阅读说明：本技术 液压电机用减速器 (Speed reducer for hydraulic motor ) 是由 郑淳在 李正赫 于 2020-10-26 设计创作，主要内容包括：本发明的多样的实施例的液压电机用减速器可以包括：外壳,其能够旋转地结合于所述液压电机；两级以上的行星齿轮组,其配置于所述外壳的内部,且沿轴向配置于通过所述液压电机旋转的旋转轴；齿轮架,其以能够旋转的方式支撑所述行星齿轮组；止推板,其结合于所述齿轮架,并限制所述行星齿轮组的轴向移动；以及盖,其密封供给至所述外壳的内部的润滑油,所述盖包括游隙调节部件,该游隙调节部件沿轴向对所述止推板加压来调节所述两级以上的行星齿轮组的轴向游隙。(The reducer for a hydraulic motor of various embodiments of the present invention may include: a housing rotatably coupled to the hydraulic motor; two or more stages of planetary gear sets disposed inside the housing and axially disposed on a rotary shaft rotated by the hydraulic motor; a carrier rotatably supporting the planetary gear set; a thrust plate coupled to the carrier and restricting axial movement of the planetary gear set; and a cover that seals the lubricating oil supplied to the inside of the housing, the cover including a play adjustment member that pressurizes the thrust plate in an axial direction to adjust axial play of the two or more stages of planetary gear sets.)

1. A reducer for a hydraulic motor, comprising:

a housing rotatably coupled to the hydraulic motor;

two or more stages of planetary gear sets disposed inside the housing and axially disposed on a rotary shaft rotated by the hydraulic motor;

a carrier rotatably supporting the planetary gear set;

a thrust plate coupled to the carrier and restricting axial movement of the planetary gear set; and

a cover sealing the lubricating oil supplied to the inside of the housing,

the cover includes a play adjustment member that presses the thrust plate in the axial direction to adjust axial play of the two or more stages of planetary gear sets.

2. A reducer for a hydraulic motor according to claim 1,

the play adjusting member includes:

a stopper that is screwed into an opening formed in the cover so as to be movable in the axial direction; and

and a support nut coupled to an outer circumferential surface of the stopper and supporting the stopper.

3. A reducer for a hydraulic motor according to claim 2, comprising:

an O-ring interposed between the support nut and the stopper and preventing oil leakage of the lubricating oil.

4. A reducer for a hydraulic motor according to claim 2,

the stopper moves axially relative to the opening of the cover to axially press the thrust plate.

5. A reducer for a hydraulic motor according to claim 2,

a groove portion for forming an oil film between a contact surface of the stopper and the thrust plate is formed in a lower surface of the stopper.

Technical Field

The present invention relates to a hydraulic motor reducer, and more particularly, to a hydraulic motor reducer that controls an axial play of a planetary gear.

Background

Since a reduction gear mainly applied to a hydraulic motor for construction machinery requires a high torque, a reduction gear capable of reducing the rotation speed and increasing the torque is provided to the motor. At this time, the reduction gear device uses a planetary gear system, and uses two or more rows of planetary gear sets to increase the reduction ratio.

The planetary gear system is composed of a sun gear and a ring gear rotated by a rotation shaft, and a planetary gear engaged with the sun gear and transmitting a rotation force of the sun gear to the ring gear, and may include a carrier for revolution of the planetary gear. However, when machining a plurality of gears, a difference in axial height of each gear may occur due to machining tolerances.

Further, when the reduction gear is assembled, a gap in which the gear is movable in the axial direction occurs due to the accumulated assembly tolerance, and at this time, if the gap is too large, the meshing length of the gear is shortened due to the axial movement and sagging of the gear, and the gear may be moved in the axial direction when rotated. This adversely affects the life of the gear, and therefore, it is necessary to manage the size of the clearance.

In the conventional method for adjusting the axial clearance of the gear, after all the gears are assembled, the clearance in which the gears are movable in the axial direction is measured by a separate jig, and as shown in fig. 1b, plates (e.g., 90 of fig. 1 b) having different thicknesses are prepared in advance and assembled into a plate having a thickness suitable for the measured clearance, or as shown in fig. 1a, covers having different thicknesses are assembled.

That is, in order to manage the axial clearance of the reduction gear, it is necessary to measure the height after the gear is assembled in the reduction gear and select an appropriate plate or cover accordingly, and there is a problem that covers and plates of different sizes for fit management need to be manufactured.

Disclosure of Invention

Technical subject

The present invention has been made to solve the above problems, and an object of the present invention is to provide a speed reducer for a hydraulic motor, which controls an axial play of a planetary gear.

Technical scheme

The reducer for a hydraulic motor of various embodiments of the present invention may include: a housing rotatably coupled to the hydraulic motor; two or more stages of planetary gear sets disposed inside the housing and axially disposed on a rotary shaft rotated by the hydraulic motor; a carrier rotatably supporting the planetary gear set; a thrust plate coupled to the carrier and restricting axial movement of the planetary gear set; and a cover that seals the lubricating oil supplied to the inside of the housing, the cover including a play adjustment member that pressurizes the thrust plate in an axial direction to adjust axial play of the two or more stages of planetary gear sets.

Preferably, the play adjusting member may include: a stopper that is screwed into an opening formed in the cover so as to be movable in the axial direction; and a support nut coupled to an outer circumferential surface of the stopper and supporting the stopper.

Preferably, the reducer for the hydraulic motor may include: an O-ring interposed between the support nut and the stopper and preventing oil leakage of the lubricating oil.

Preferably, the stopper is axially movable relative to the opening of the cover to axially press the thrust plate.

Preferably, a groove portion for forming an oil film between a contact surface with the thrust plate may be formed on a lower surface of the stopper.

ADVANTAGEOUS EFFECTS OF INVENTION

The speed reducer for the hydraulic motor of various embodiments of the invention can control the axial play of the gear set.

Further, the process of separately manufacturing parts of different sizes or measuring the height in order to control the backlash of the gear train can be eliminated, so that the efficiency of the parts manufacturing and assembling process can be improved.

Drawings

Fig. 1a and 1b are sectional views illustrating a reducer structure for a hydraulic motor in the related art.

Fig. 2 is a sectional view of a reducer for a hydraulic motor illustrating various embodiments of the present invention.

Fig. 3a to 3c are views illustrating groove portions formed on the lower surface of a stopper according to various embodiments of the present invention.

Reference numerals

110: a cover, 113: step portion, 115: seal, 120: thrust plate, 130: planetary gear set, 131: sun gear, 132: planetary gear, 133: ring gear, 135: carrier, 150: rotation axis, 170: housing, 190: play adjustment member, 191: stopper, 193: support nut, 195: an O-ring.

Detailed Description

Hereinafter, for convenience of description, some embodiments of the present invention will be described with reference to the accompanying exemplary drawings. When reference numerals are given to components in each drawing, the same components are denoted by the same reference numerals as much as possible in different drawings.

The terms or words used in the present specification and claims should not be limited to general or dictionary meanings, but should be interpreted as meanings and concepts conforming to the technical idea of the present invention on the basis of the principle that the inventor can appropriately define the concept of the terms in order to explain his own invention in an optimum manner. In the description of the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), and the like may be used. Such terms are only used to distinguish one constituent element from another constituent element, and the nature, order, sequence, or the like of the constituent elements is not limited by the terms. When it is described that a certain component is "connected" or "coupled" to another component, it is to be understood that the component may be directly connected or coupled to the other component, but another component may be "connected" or "coupled" between the component and the other component.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferable embodiments of the present invention and do not represent all the technical ideas of the present invention, and therefore, it should be understood that various equivalents and modifications that can replace the embodiments may be possible at the time of the present application. In addition, detailed descriptions of well-known functions and configurations which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, one axial end portion of the rotation shaft 150 of the decelerator may be described as "upper side" or "upper side", and conversely, the other axial end portion connected to the hydraulic motor may be described as "lower side" or "lower side".

Hereinafter, the terms "decelerator for hydraulic motor" and "decelerator" may be used in combination.

The decelerator of various embodiments of the present invention may be coupled to one side of a hydraulic motor (not shown). The speed reducer may be connected to an output shaft (not shown) of the hydraulic motor, and may reduce the rotational speed of the output shaft of the hydraulic motor at a constant reduction ratio to ensure high torque.

A speed reducer for a hydraulic motor according to various embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 2 is a sectional view illustrating a reducer for a hydraulic motor according to various embodiments of the present invention, and fig. 3a to 3c are views illustrating groove portions formed on a lower surface of a stopper 191 according to various embodiments of the present invention.

Referring to fig. 2, the decelerator of various embodiments of the present invention may include a housing 170, a rotation shaft 150, a multi-stage planetary gear set, a cover 110, and a lash adjustment member 190 coupled to the cover 110. In the present invention, a technique is proposed to control the axial clearance or play generated by the planetary gear sets 130 of the multiple stages during the assembly of the reduction gear by the play adjusting member 190.

The decelerator of various embodiments of the present invention may include a housing 170. The housing 170 may be rotatably coupled to one axial side of the hydraulic motor. A ring gear 133 may be formed on an inner circumferential surface of the housing 170. Lubricating oil may be injected into the interior of the housing 170, and a cover 110 for sealing such lubricating oil may be coupled to an opposite-direction end portion of the hydraulic motor of the housing 170.

Further, the decelerator may include a rotation shaft 150, and the rotation shaft 150 may be connected to an output shaft of the hydraulic motor and rotate at the same rotation speed as the output shaft. The rotating shaft 150 may be coupled to the output shaft by a coupling (not shown), for example, but is not limited thereto. As will be described later, the planetary gear set 130 of the plurality of stages may be disposed on the rotary shaft 150 in the axial direction, and specifically, the sun gear 131 of the plurality of stages constituting the planetary gear set 130 may be disposed on the rotary shaft 150.

The speed reducer may include a planetary gear set 130. The planetary gear 130 may include a sun gear 131 coupled to the rotation shaft 150 and rotating together with the rotation shaft 150, a ring gear 133 disposed on an inner circumferential surface of the housing 170, and a planetary gear 132 engaged with the sun gear 131 and transmitting a rotational force of the sun gear 131 to the ring gear 133 at a reduced speed.

The sun gear 131 is coupled to the rotary shaft 150, and the sun gear 131 may rotate together with the rotation of the rotary shaft 150 by the rotation of the hydraulic motor.

The plurality of planetary gears 132 may be disposed between the sun gear 131 and the ring gear 133, and the plurality of planetary gears 132 may be supported by the carrier 135 and revolve around the sun gear 131. The planetary gears 132 may transmit the rotational force of the sun gear 131 to the ring gear 133 to rotate the ring gear 133, thereby allowing the housing 170 to rotate. A thrust plate 120(thrust plate) pressed by a stopper 191 as described later may be disposed on the upper end of the carrier 135.

The ring gear 133 may be disposed on an inner circumferential surface of the housing 170, and the housing 170 may rotate by rotating with the rotation of the planetary gears 132 and the carrier 135.

The planetary gear set 130 may be formed in one stage, but may be formed in multiple stages in order to increase the reduction ratio. The present specification may describe the planetary gear set 130 as including two stages, but is not limited thereto. Since the combination relationship of the planetary gear sets 130 of the respective stages is well known in the art, a detailed description thereof will be omitted.

When a two-stage planetary gear set 130 is included, as shown in fig. 2, it may be described as including a first planetary gear set 130 adjacent to the cover 110, and a second planetary gear set 130 adjacently disposed substantially parallel in the axial direction of the rotary shaft 150 with respect to the first planetary gear set 130. In the gear sets of the respective stages, play or movement in the axial direction may occur when the gears rotate due to machining tolerances and assembly tolerances of the gears. The present invention aims to prevent or minimize such axial play.

The decelerator may include a cover 110. The cover 110 may be coupled to the housing 170 in a direction opposite to the direction in which the housing 170 is coupled to the hydraulic motor to seal the inside of the housing 170. The cover 110 may be formed to have a prescribed thickness, and may be formed in a substantially plate shape. The cover 110 may include a stepped portion 113 concavely stepped in the axial direction of the rotation shaft 150. The stepped portion 113 may be formed substantially at the center portion of the cover 110, and preferably may be formed at a position corresponding to the rotation shaft 150. Further, a through hole penetrating the cap 110 in the axial direction may be formed in a substantially central portion of the stepped portion 113. The through-hole may be formed at a position corresponding to the rotation shaft 150. A screw thread may be formed on the inner circumferential surface of the through hole.

A seal 115 for preventing oil leakage of the lubricating oil may be interposed between the cover 110 and the housing 170.

According to various embodiments of the present invention, the play adjusting member 190 may be disposed at such a step portion 113 and a through hole of the cover 110. According to various embodiments of the present invention, the play adjustment member 190 may include a stopper 191 that axially presses the thrust plate 120, and a support nut 193 that fixedly supports the stopper 191 at a predetermined position.

The stopper 191 may be coupled to the through hole of the cover 110 to be movable in the axial direction. A screw thread corresponding to the screw thread formed on the inner circumferential surface of the through hole may be formed on the outer circumferential surface of the stopper 191. In one embodiment, an internal thread may be formed on an inner circumferential surface of the through hole, and an external thread may be formed on an outer circumferential surface of the stopper 191 to correspond thereto. Thus, the stopper 191 can be screwed with respect to the through hole, and when the worker rotates the stopper 191, the stopper 191 can move in the axial direction along the screw with respect to the through hole.

A working groove 192 for an operator to engage a tool for rotating the stopper 191 may be formed at one side of the stopper 191. Referring to fig. 3a to 3c, a groove 197 capable of accommodating lubricating oil may be formed on the lower end surface of the stopper 191 in contact with the thrust plate 120. In an embodiment, the groove portion 197 may be formed in a cross shape, but is not limited thereto, and may also be formed in a spiral shape or a radial shape in a manner corresponding to a rotation direction.

Since the stopper 191 and the thrust plate 120 can slide with each other in a state of contact, an oil film can be formed at a contact surface between the lower end surface of the stopper 191 and the upper end surface of the thrust plate 120 at the time of sliding by forming the groove portion 197 at the lower end surface of the stopper 191 to contain the lubricating oil in the groove portion 197. However, a groove portion for accommodating lubricating oil may be formed on the upper surface of the thrust plate 120.

The support nut 193 may be disposed coaxially with the through hole cover 110 at the step portion 113. The support nut 193 may be penetratingly coupled by the stopper 191, and may have a screw thread formed at an inner circumferential surface thereof for screw-coupling with the stopper 191. After the operator rotates the stopper 191 to move the stopper 191 to a predetermined position in the axial direction, the support nut 193 is screwed to the upper end of the stopper 191 to fix and support the stopper 191 at a desired position.

According to various embodiments of the present invention, an O-ring 195 may be disposed on an inner circumferential surface of the supporting nut 193, and the O-ring 195 may be interposed between the supporting nut 193 and the stopper 191 to prevent oil leakage of the lubricant inside the housing 170. In one embodiment, an O-ring 195 may be disposed at an axially lower end of the support nut 193.

The axial play control of the speed reducer by the play adjusting member 190 of the present invention can be performed as follows.

The operator rotates the stopper 191 coupled to axially penetrate the cap 110, so that the stopper 191 is screwed into the through hole to move axially. At this time, the lower end of the stopper 191 may contact the thrust plate 120, and the stopper 191 may be further rotated by the operator to press the thrust plate 120 in the axial downward direction. As the thrust plate 120 provided to the carrier 135 supporting the planetary gear 132 of the first stage is pressurized in the axial direction, the play between the planetary gears 132 configured in multiple stages can be adjusted.

After the operator rotates the stopper 191 to a desired position, the support nut 193 may be screwed to the stopper 191, and the stopper 191 may be fixedly supported at the corresponding position by tightening the support nut 193 to a position in contact with the step portion 113 of the cover 110.

That is, according to various embodiments of the present invention, the operator may control the axial play of the multi-stage planetary gear set 130 by simply rotating the stopper 191 in a state where the cover 110 is coupled to the housing 170.

Therefore, in the present invention, a process of measuring the axial height and measuring the corresponding play when assembling a reduction gear including the planetary gear set 130 of multiple stages as in the related art, and additionally inserting a plate of a corresponding thickness or adjusting the thickness of the cover 110 in order to correct the thickness equivalent to the play may be eliminated.

The fact that all the constituent elements constituting the embodiments of the present invention are combined into one or one to operate as described above does not mean that the present invention is necessarily limited to these embodiments. That is, all the components may be selectively combined and operated by one or more than one, without departing from the object scope of the present invention. In addition, unless otherwise stated to the contrary, the terms "including", "constituting" or "having" described above mean that the constituent element may be included, and thus should be interpreted as including other constituent elements as well, without excluding other constituent elements. Unless otherwise defined, all terms including technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms commonly used as terms defined in dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The above description is merely an exemplary description of the technical idea of the present invention, and a person having ordinary skill in the art to which the present invention pertains can make various modifications and variations within a scope not departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed herein are intended to illustrate the technical idea of the present invention, and not to limit the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited to these embodiments. The scope of the invention should be construed by the claims that follow, and all technical ideas within the range of equivalents thereof should be construed to fall within the scope of the claims of the invention.