JP2017072236A - Gear transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To configure a gear transmission device that allows smooth transmission while stabilizing a posture of a face gear.SOLUTION: The gear transmission device includes: a pinion gear; and the face gear G1 having a tooth part 2 at an outer periphery of a first face 1a of a disc part 1 and engaging with the pinion gear. A projection 20 is formed at a second face 1b of the disc part 1 where the tooth part 2 is not formed. A recess 21 capable of holding lubricant is formed at a projection end of the projection 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gear transmission provided with a pinion gear and a face gear in which teeth that mesh with the pinion gear are formed on the outer periphery of a disk-shaped disk portion.

  As a gear transmission device having the above-described configuration, Patent Document 1 discloses a technique in which a biasing member that biases the rotation center of the face gear toward the meshing side with respect to the pinion gear is mounted in order to adjust the meshing between the face gear and the pinion gear. It is shown.

  In Patent Document 2, a biasing member that biases the rotation center portion of the face gear toward the meshing side with respect to the pinion gear is mounted, and when the overload acts on the meshing portion of the face gear and the pinion gear, the meshing is attached. The technology that is released against the power is shown.

  Patent Document 3 discloses a technique in which a gear receiving portion is provided on the back surface of the face gear opposite to the surface on which the tooth portion is formed in order to regulate the inclination of the face gear. In this technology, a roller that is rotatably supported by a support shaft is provided as a gear receiving portion, and this roller is disposed at a position facing the meshing portion of the face gear and the pinion gear on the back surface of the face gear. ing.

JP-A-10-210901 JP 2004-132418 A JP 2001-78630 A

  Since each of the devices of Patent Documents 1 and 2 has a biasing member that biases toward the meshing side over the entire circumference of the face gear, the meshing depth between the face gear and the pinion gear is appropriately set. It is possible to maintain and suppress a decrease in durability. However, if the posture of the face gear rotation axis is shaken, the relative posture of the tooth portions at the meshing portion of the face gear and the pinion gear may change, and smooth relative movement may be hindered, resulting in a reduction in power transmission efficiency. was there.

In the device of Patent Document 3, since the gear receiving portion is disposed at the back surface position opposite to the meshing position of the pinion gear and the face gear, the meshing depth between the face gear and the pinion gear is appropriately maintained to reduce durability. Can be suppressed. Moreover, in this apparatus, the smooth relative movement of the tooth parts in the meshing part is maintained to suppress a decrease in power transmission efficiency.
However, in the apparatus of Patent Document 3, since the roller of the gear receiving portion is configured to always contact the back surface of the face gear, not only energy loss occurs when the face gear rotates, but also the gear receiving portion is provided. The number of parts increased.

  That is, there is a need for a gear transmission that enables smooth transmission while stabilizing the posture of the face gear.

A feature of the present invention includes a pinion gear, and a face gear having a tooth portion protruding from one first surface at the outer peripheral portion of the disk-shaped disc portion and meshing with the pinion gear,
A protrusion having a length set in advance along the circumferential direction of the face gear with respect to the rotational axis of the face gear is formed on the other second surface of the disk portion where the tooth portion is not formed. A recess is formed at the protruding end to hold the lubricating oil.

According to this configuration, the projecting portion formed on the second surface is arranged so as to be close to the inner surface of the housing or the like of the apparatus or to be in light contact with each other. Even when the posture of the face gear changes so that the core swings, it is possible to stabilize the posture of the face gear by the protruding portion coming into contact with the inner surface of the housing or the like. Further, the lubricating oil is held in the concave portion formed in the protruding portion, and even if the protruding portion contacts the inner surface of the housing or the like, the lubricating oil suppresses an increase in resistance due to friction and realizes smooth rotation.
Therefore, a gear transmission device has been constructed that enables smooth transmission while stabilizing the posture of the face gear.

  In the present invention, the recess may be formed along the extending direction of the protrusion at a central position in the width direction of the protrusion.

  In this way, by forming the concave portion at the center position of the width of the protruding portion, the lubricating oil is sent out from the center in the width direction of the protruding portion to the inside and outside, and reliably to the contact portion between the inner surface of the housing and the protruding portion Supply and lubricate without bias. Moreover, since the recessed part is formed along the extension direction (length direction) of a protrusion part, it becomes possible to send the lubricating oil from a recessed part along an extension direction, and to improve a friction reduction effect.

  In the present invention, the communicating portion extending from the recess to the opening end that opens to at least one of the inside and the outside of the projecting portion in the radial direction of the rotation axis is provided in the rotational direction of the face gear. You may prepare for the state extended to the lower side.

  According to this, it becomes possible to guide the lubricating oil present in at least one of the inner side and the outer side of the projecting portion to the concave portion through the communicating portion as the face gear rotates, and good lubricity can be maintained.

  In the present invention, the cross-sectional area of the communication portion may be set to be larger than the cross-sectional area at the position where the communication portion communicates with the recess.

  Thus, if the cross-sectional area of the opening end portion of the communicating portion is larger than the cross-sectional area of the position where the communicating portion communicates with the concave portion, the lubricating oil existing outside the protruding portion is greatly opened via the opening end portion that is largely opened. It becomes easy to take in the communication portion, and a sufficient amount of lubricating oil can be supplied to the recess.

  In the present invention, a wide portion having an enlarged width is formed in a part of the projecting portion, and the opening end portion is an end portion on the lower side in the rotational direction among both end portions in the rotational direction of the wide portion. And it may open to the position where the lubricating oil stays during rotation of the face gear.

  According to this, when the face gear rotates, the lubricating oil staying in contact with the wide portion of the projecting portion is reliably guided from the downstream opening of the wide portion to the communicating portion. An amount of lubricating oil can be positively supplied to the recess.

It is a cross-sectional view of a gear transmission. It is the II-II sectional view taken on the line of FIG. It is sectional drawing which shows the positional relationship of a protrusion part and a case inner surface. It is a figure which shows a protrusion part and a communication part. It is a figure which shows the communication part of another embodiment (a). It is a figure which shows the communication part and wide part of another embodiment (b).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration of gear transmission]
As shown in FIGS. 1 and 2, a face gear G1 that is rotatable about the first axis X1 and a pinion gear G2 that is rotatable about the second axis X2 at a position that is different from the first axis X1. The gear transmission is configured by meshing with each other and housed in the housing H.

  This gear transmission is provided in a transmission system that drives the face gear G1 at a reduced speed by driving and rotating the pinion gear G2 with an actuator such as an electric motor.

  The face gear G1 has a plurality of tooth portions 2 formed in a protruding form on the outer peripheral portion of the first surface 1a of the disc-shaped disc portion 1 with the first axis X1 as the center, and an output shaft 4 in the central drive hole 3. Are connected in the inserted state. The face gear G1 is supported with respect to the housing H via the output shaft 4 so as to be rotatable about the first axis X1. Further, in the face gear G1, a protrusion 20 described later is formed with respect to the second surface 1b opposite to the first surface 1a.

  The face gear G1 is assumed to be manufactured by forging or pressing using a metal material, but a plurality of tooth portions 2 and protrusions 20 may be manufactured by cutting the material. Further, it may be manufactured by resin molding using a mold.

  The pinion gear G2 is configured as a helical gear integrally formed with two gear portions 11 (tooth portions of the pinion gear G2) that are screw-shaped with respect to the shaft 10, and is supported rotatably about the second axis X2. The pinion gear G2 is rotatably supported with respect to the housing H by bearings 13 disposed at the inner end position and the intermediate position.

  The housing H has a structure in which the lid case 16 is overlapped and sealed with the main case 15 and accommodates the face gear G1 and the pinion gear G2. In particular, on the inner side of the main case 15, a flat case inner surface 15S is formed in a posture orthogonal to the first axis X1.

(Protrusion)
As shown in FIGS. 3 and 4, in the gear transmission in which the gear portion 11 of the pinion gear G2 meshes with a part of the tooth portion 2 of the face gear G1, the pressing force of the pinion gear G2 tilts the posture of the face gear G1 ( Acting in the direction of tilting the posture of the first axis X1. In order to stabilize the posture of the face gear G1 in such a situation, the protruding portion 20 is formed on the second surface 1b of the face gear G1, and the protruding end is lightly brought into contact with the case inner surface 15S. In addition, you may make the protrusion part 20 adjoin to case inner surface 15S.

  That is, the protrusion 20 on the face gear G1 is a circle centered on the first axis X1 with respect to the second surface 1b opposite to the first surface 1a on which the tooth portion 2 of the disk portion 1 is formed. A protrusion is formed along the circumferential region.

  The protruding portion 20 is annularly arranged at a position overlapping the center in the tooth width direction of the tooth portion 2 when viewed in the direction along the first axis X1, and the protruding end of the protruding portion 20 has a width of the protruding portion 20. A concave portion 21 is formed in a groove shape in a circumferential region centered on the first axis X1 at the center in the direction.

  In the projecting portion 20, a plurality of communicating portions 22 are formed in a groove shape so as to guide the lubricating oil outside (inner and outer) of the projecting portion 20 to the recess 21. These communication portions 22 may be formed on one or both of the inner peripheral side and the outer peripheral side of the protruding portion 20, and in the present embodiment, those formed on the inner peripheral side are shown.

  The communication portion 22 is formed in such a posture that grease as external lubricating oil is fed into the concave portion 21 as the face gear G1 rotates. That is, the face gear G1 rotates in the direction of the rotation direction F indicated by the arrow. When the face gear G1 rotates in the rotation direction F, the communicating portion is opened so that the opening end 22A is opened downstream in the rotation direction F. 22 is formed.

  That is, the communication portion 22 is formed in the recess 21 to feed the grease into the recess 21 among the open end 22A formed on the outer surface of the protrusion 20 so as to be upstream in the direction of introducing the grease, and the communication portion 22. And a connection end 22B to be connected. In this configuration, the position of the opening end 22A is formed so as to project toward the downstream side in the rotation direction F of the face gear G1 and to protrude inward in the radial direction of the disk unit 1.

  The gear transmission can also be configured to rotate the face gear G1 in both forward and reverse directions. In the gear transmission of this configuration, two types of communication portions 22 are formed, a communication portion 22 for feeding grease into the recess 21 during forward rotation and a communication portion 22 for feeding grease (lubricating oil) into the recess 21 during reverse rotation. It is also possible to do. In addition, when forming two types of communicating parts 22 in any one of the inner side and the outer side of the protrusion part 20, each is formed with a different attitude | position. It is also possible to form one of the two types of communicating portions 22 inside the projecting portion 20 and form the other outside the projecting portion 20.

(Lubrication configuration)
Grease (an example of lubricating oil) is stored inside the housing H, and the lubrication between the tooth portion 2 of the face gear G1 and the gear portion 11 of the pinion gear G2 is supplied by this grease to achieve smooth operation. Realized. The grease is also present between the case inner surface 15S of the main case 15 and the second surface 1b of the face gear G1. Accordingly, the grease existing on the inner side in the radial direction from the projecting portion 20 on the second surface 1b is introduced into the communication portion 22 from the opening end portion 22A by the rotation of the face gear G1, and is supplied to the recess portion 21 through the connection end portion 22B. Is done.

  With such a configuration, even if a strong force acts between the tooth portion 2 of the face gear G1 and the gear portion 11 of the pinion gear G2, and this force acts in a direction that changes the posture of the face gear G1, the protruding portion 20 and the case inner surface 15S are in contact with each other, so that the posture of the face gear G1 is stably maintained. Furthermore, since grease can be continuously supplied between the protruding portion 20 and the case inner surface 15S, the face gear G1 can be smoothly rotated to suppress wear between the protruding portion 20 and the case inner surface 15S, thereby improving durability. Is possible.

[Another embodiment]
In addition to the above-described embodiments, the present invention may be configured as follows (the components having the same functions as those of the embodiments are given the same numbers and symbols as those of the embodiments).

(A) The communication part 22 may be formed in a hole shape. Further, the communication portion 22 is connected to the recess 21 by connecting the opening cross-sectional area of the opening end 22A for taking in grease (lubricating oil) as shown in FIG. You may set larger than the opening cross-sectional area of 22B.

  In this other embodiment, the opening width Wa of the opening end 22A is set wider than the opening width Wb of the connection end 22B. In order to set the opening cross-sectional area of the opening end 22A to be larger than the opening cross-sectional area of the connection end 22B, the respective opening widths are made equal and the opening depth (the dimension in the direction along the first axis X1) is set. ) May be different.

  With this configuration, when the grease outside the protruding portion 20 is fed into the communication portion 22, it is possible to take in the grease through the open end 22 </ b> A that is largely open and supply the grease to the recess 21, so that a sufficient amount of grease can be supplied. Can be supplied to the recess 21.

(B) As shown in FIG. 6, a wide portion 20A in which a part of the protrusion 20 is enlarged is formed integrally with the protrusion 20, and of the wide portion 20A, the rotation direction F of the face gear G1 is increased. You may form the opening end part 22A for taking in grease to the communicating part 22 in a downstream position.

  With this configuration, when the face gear G1 rotates in the rotation direction F, the grease that has come into contact with the wide portion 20A stays on the downstream side of the wide portion 20A and is guided from the open end 22A to the communication portion 22. A sufficient amount of grease can be supplied to the recess 21. In addition, in the structure which forms the communication part 22 in such a position, you may set the opening cross-sectional area of 22 A of opening edge parts larger than the opening cross-sectional area of 22 A of connection ends like another embodiment (a). . Further, a plurality of wide portions 20A may be formed, and the communication portion 22 may be formed in each.

  Since the gear transmission can be configured to rotate the face gear G1 in both the forward and reverse directions, the position where the wide portion 20A is sandwiched so that grease (lubricating oil) can be supplied to the recess 21 when rotating in any direction. You may form the opening end part 22A of the communication part 22 in two places (position which pinches | interposes the wide part 20A in the circumferential direction of the face gear G1).

(C) The protrusion 20 may be formed with a length set in advance in the circumferential direction around the first axis X1. That is, this protrusion 20 does not necessarily need to be formed in an annular shape over the entire circumference, and a plurality of protrusions 20 can be formed by partially forming in a circumferential region centered on the first axis X1. May be formed independently. Further, the communication part 22 may be formed on the outer peripheral side of the protruding part 20. Furthermore, the protrusion 20 can be formed in a plurality of circumferential regions having different radii around the first axis X1.

  The present invention can be used in a gear transmission provided with a pinion gear and a face gear.

DESCRIPTION OF SYMBOLS 1 Disc part 1a 1st surface 1b 2nd surface 2 Tooth part 20 Protruding part 21 Recessed part 22 Communication part 22A Opening end part G1 Face gear G2 Pinion gear X1 Rotation axis (1st axis)

Claims (5)

With pinion gears,
A face gear having a tooth portion protruding from one first surface at the outer peripheral portion of the disk-shaped disc portion, and meshing with the pinion gear,
A protrusion having a length set in advance along the circumferential direction of the face gear with respect to the rotational axis of the face gear is formed on the other second surface of the disk portion where the tooth portion is not formed. A gear transmission in which a recess for holding lubricating oil is formed at a protruding end.   The gear transmission according to claim 1, wherein the recess is formed along the extending direction of the protrusion at a central position in the width direction of the protrusion.   A communicating portion extending from the recess to the lower side in the rotational direction of the face gear extends from the recess to the opening end that opens to at least one of the inside and the outside of the protruding portion in the radial direction of the rotating shaft. The gear transmission according to claim 1, wherein the gear transmission is provided in a state of being released.   The gear transmission according to claim 3, wherein a cross-sectional area of the communication portion is set to be larger than a cross-sectional area at a position where the communication portion communicates with the recess. A wide part with an enlarged width is formed on a part of the protruding part,
The opening end portion is an end portion on the lower side in the rotation direction among both end portions in the rotation direction of the wide portion, and opens at a position where the lubricating oil stays during rotation of the face gear. Item 5. The gear transmission according to Item 3 or 4.

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