JP2016105015A - Gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear device capable of rationally supporting a pinion inside of a case accommodating a pinion and a face gear.SOLUTION: A gear device includes a pinion 2 having a first end portion 2b connected to a driving portion M and a second end portion 2c different from the first end portion 2b, and driving and rotating around a first rotating shaft core X, a face gear 1 rotating around a second rotating shaft core Y different from the first rotating shaft core X, and engaged with the pinion 2, and a case 3 accommodating the pinion 2 and the face gear 1. The second end portion 2c of the pinion 2 is held in a region opposed to the face gear 1, and a holding portion 5 for preventing the pinion 2 from separating from the face gear 1 in driving the pinion 2, is disposed inside of the case 3.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a gear device in which a pinion and a face gear mesh with each other.

Patent Document 1 discloses a gear device having a pinion that rotates around a first rotation axis and a face gear that rotates around a second rotation axis in a direction different from the first rotation axis and meshes with the pinion. Is described.
In this gear device, in order to prevent the pinion from moving away from the face gear when the pinion is driven, a boss portion is provided around the face gear axis, and the pinion is provided in a circumferential groove provided on the outer peripheral surface of the boss portion. Is supported at one end. One end of the pinion is supported by entering the peripheral groove so as to be relatively slidable, and movement in a direction away from the face gear is restricted.

JP 2009-287581

  In the conventional gear device described above, it is necessary to increase the diameter of the boss portion in which the circumferential groove is provided in the face gear as the inter-axis distance between the first rotating shaft core and the second rotating shaft core increases. For this reason, the occupation area of the face gear becomes large, and the gear device tends to be large.

  In view of the above situation, there is a demand for a gear device that can rationally support the pinion inside the case that accommodates the pinion and the face gear.

  A characteristic configuration of the gear device according to the present invention includes a first end connected to the drive unit and a second end different from the first end, and rotates around the first rotation axis. A pinion, a face gear that rotates around a second rotation axis different from the first rotation axis and meshes with the pinion, and a case that accommodates the pinion and the face gear, and the pinion The second end is held at a portion facing the face gear, and a holding portion is provided inside the case to prevent the pinion from moving away from the face gear when the pinion is driven. .

The gear device of this configuration holds the second end portion that is not connected to the drive unit of the pinion at a portion facing the face gear in a holding portion provided inside the case. Therefore, the structure of the holding portion can be simplified and the assembly of the pinion is facilitated as compared with the case where the holding portion that holds the second end portion so as to wrap around the entire circumference is provided. .
Since the holding portion at the second end of the pinion is provided in the case facing the face gear across the pinion, it is not necessary to apply special processing to the face gear or the pinion in order to form the holding portion. Further, since the holding portion can be disposed only in the region of the second end portion of the pinion, the area occupied by the holding portion can be reduced, and the gear device can be configured compactly.

  Another feature of the present invention is that the holding portion includes a swing restricting portion that prevents the pinion from swinging along the plane direction of the face gear.

When the pinion is driven, the pinion may swing along the plane direction of the face gear based on the driving torque or the like.
By performing the swing restriction as in this configuration, the state of engagement of the pinion with the face gear can be optimally maintained.

  Another feature of the present invention is that the holding portion includes an urging mechanism that adjusts an urging force that directs the second end portion of the pinion toward the face gear.

In some cases, the pinion may not be properly pressed against the face gear simply by assembling the case having the holding portion integrally provided, due to a dimensional error of the case.
Therefore, as in this configuration, by adjusting the urging force that directs the second end of the pinion toward the face gear after assembly of the case, the second end of the pinion is pressed by the holding portion, and the pinion and the face gear Can be set optimally.

  Another characteristic configuration of the present invention is that the case includes a resin filling portion adjacent to the holding portion so as to move the holding portion toward the pinion as the biasing mechanism.

  If it is this structure, the urging | biasing force to the 2nd edge part of a pinion can be adjusted with the simple structure which provides the space which forms a resin filling part adjacent to a holding | maintenance part with the filling amount of the resin to the space. it can.

  Another feature of the present invention is that a bearing is attached to the second end of the pinion.

  By mounting the bearing on the second end of the pinion as in this configuration, the rotational resistance of the pinion can be reduced and the operation of the gear device can be made smooth.

  Another characteristic configuration of the present invention is that the holding portion includes a restricting portion that prevents the bearing from coming out of the pinion in a direction along the first rotation axis.

When the bearing rotates during driving of the pinion, the bearing may move on the pinion along the extending direction of the first rotating shaft core and drop off from the pinion.
Then, like this structure, a holding part is provided with a control part, it can be set as the state which assembled | attached the bearing with respect to the holding part reliably, and the reliability of a gear apparatus can be improved.

  Another feature of the present invention is that the second end of the pinion is made of a magnetic material, and at least a portion of the holding portion that faces the second end is made of a magnet. .

Like this structure, the 2nd end part of a pinion can be made to adsorb | suck to a magnet by making the magnet of a holding | maintenance part oppose the 2nd end part comprised with the magnetic material in a pinion. As a result, even if the contact state between the pinion and the face gear is rattled, and the pinion and the face gear repeatedly contact and separate from each other and abnormal noise and vibration occur, the pinion is At the two ends, rattling does not occur and vibration during rotation is unlikely to occur. As a result, the pinion can transmit the rotational force to the face gear in a stable posture.
On the other hand, when the second end of the pinion is magnetized to the same polarity as the magnet of the holding part, the second end repels the holding part, so that the pinion is always urged toward the face gear. Can do. Also in this case, rattling of the pinion and shake during rotation can be reduced.

It is a perspective view which shows the inside of a gear apparatus. It is a top view which shows a gear meshing structure. It is a side view which shows a gear meshing structure. It is sectional drawing which shows a gear meshing structure. It is a front view of the principal part which shows the support structure of a pinion. It is sectional drawing which shows the gear meshing structure in 2nd Embodiment. It is a front view of the principal part which shows the support structure of the pinion in 3rd Embodiment. It is a perspective view which shows the principal part of the gear apparatus in 4th Embodiment. It is sectional drawing of the principal part which shows the support structure of the pinion in 4th Embodiment. It is sectional drawing of the modification of 4th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 to 5 show the gear device of the first embodiment.
The gear device of the present embodiment is installed in, for example, an automobile AMT (automatic manual transmission) (not shown), and operates the AMT by linking the clutch operating member A to the rotation of the face gear 1.

As shown in FIGS. 1 to 4, the gear device rotates about a pinion 2 that rotates around the first rotation axis X and a second rotation axis Y in a direction different from the first rotation axis X. And a case 3 for housing the pinion 2 and the face gear 1.
The second rotation axis Y is an axis having an offset d with respect to the first rotation axis X and parallel to a direction perpendicular to the first rotation axis X.

The pinion 2 is a helical gear with a small number of teeth that is rotatably supported around the first rotation axis X, and has two tooth portions 2a formed in a spiral shape around the first rotation axis X. ing.
The pinion 2 includes a base side shaft portion 2b and a distal end side shaft portion 2c concentrically sandwiching the tooth portion 2a from the axial direction.

The pinion 2 is connected to the output shaft of the electric motor M, which is the drive portion of the base side shaft portion 2b, and is driven to rotate around the first rotation axis X by the drive of the electric motor M.
Accordingly, the base side shaft portion 2b corresponds to a first end portion connected to the driving portion, and the distal end side shaft portion 2c corresponds to a second end portion different from the first end portion.
A first bearing (rolling bearing) 4 a is assembled to a fixing seat plate 3 a for the case 3 of the electric motor M. The base side shaft portion 2b is rotatably supported by the first bearing 4a.
A second bearing (rolling bearing) 4b is attached to the distal end side shaft portion 2c, and a large-diameter portion 2d for positioning the second bearing 4b is provided.

The face gear 1 is a sector face gear formed in a sector shape with the second rotation axis Y as the center, and a gear forming portion 1 a that meshes with the pinion 2 is provided in an arc belt shape with the second rotation axis Y as the center. is there.
The face gear 1 is supported so as to be reciprocally rotatable within a certain angular range around the second rotational axis Y by rotating and rotating the pinion 2 forward and backward with the electric motor M.

The face gear 1 has a boss portion 1b on a flat fan-shaped substrate 1c, and a gear forming portion 1a protruding integrally on one side of the fan-shaped substrate 1c.
A support shaft 3b is fixed to the inner upper portion of the case 3 in a cantilever posture protruding downward.
The face gear 1 is supported so as to be rotatable around the second rotation axis Y by inserting the support shaft 3b through the boss portion 1b.

  As shown in FIG. 4, on the inner side of the case 3, the other end portion of the end portion of the pinion 2 that is not connected to the drive portion, that is, the distal end side shaft that is not connected to the output shaft of the electric motor M A holding portion 5 that holds the portion 2 c at a portion facing the face gear 1 is provided. The holding portion 5 presses the pinion 2 toward the face gear 1 via the second bearing 4b. Thereby, the contact state of the pinion 2 and the face gear 1 is maintained. The holding portion 5 holds the tip side shaft portion 2c of the pinion 2 at a portion facing the face gear 1, and prevents the pinion 2 from moving away from the face gear 1 when the pinion 2 is driven.

  A fitting recess 6 that opens toward the face gear 1 is formed on the inner surface side of the case 3. The holding part 5 has a fitting member 5 a that is assembled integrally with the case 3 by fitting into the fitting recess 6 from a direction parallel to the second rotation axis Y, for example.

The fitting member 5 a holds the cylindrical outer peripheral surface of the second bearing 4 b from the radial direction parallel to the second rotation axis Y.
Therefore, the fitting member 5a includes a semicircular arc-shaped holding surface 5b and a second bearing 4b from the pinion 2 to the first rotating shaft as seen in the direction along the first rotating shaft X as shown in FIGS. A slip-out restricting portion 5c that prevents the slip in the direction along the core X is provided.

The semicircular arc-shaped holding surface 5 b constitutes a swing restricting portion that prevents the pinion 2 from swinging along the plane direction of the face gear 1.
The plane direction of the face gear 1 means a direction along a plane orthogonal to the second rotation axis Y.

The holding portion 5 brings the holding surface 5b of the fitting member 5a fitted in the fitting recess 6 into close contact with the cylindrical outer peripheral surface of the second bearing 4b toward the face gear 1, and also comes out and restricts the portion 5c. Is brought into contact with the end surface in the axial direction of the second bearing 4b.
Accordingly, the holding portion 5 presses the second bearing 4b toward the face gear 1 so that the pinion 2 abuts against the face gear 1, and prevents the second bearing 4b from coming off from the distal end side shaft portion 2c. .

In the present embodiment, as shown in FIG. 2, the pinion 2 is disposed across the gear forming portion 1a of the face gear 1 so that the second bearing 4b is located between the gear forming portion 1a and the boss portion 1b. It is.
Thereby, the short pinion 2 can be provided so that the second bearing 4b does not interfere with the gear forming portion 1a, and the case 3 can be downsized, and the degree of freedom in arrangement of the holding portion 5 can be increased.

As shown in FIG. 4, the holding portion 5 includes a biasing mechanism 7 that adjusts a biasing force that directs the distal end side shaft portion 2 c toward the face gear 1.
The urging mechanism 7 fills the resin filling portion 7a adjacent to the holding portion 5 with the resin in contact with the fitting member 5a so as to move the fitting member 5a toward the pinion 2. In preparation.

The resin filling portion 7a is provided with a filling space 7b that communicates with the fitting recess 6 and a communication path 7c that communicates the filling space 7b with the outside of the case in the case 3, and injection into the filling space 7b through the communication path 7c. The uncured resin filled with is cured.
FIG. 4 shows the resin filling portion 7a in which the uncured resin is cured after the uncured resin is injected into the filling space 7b and the communication path 7c is closed with the plug 7d.

  Note that the urging mechanism 7 may be any mechanism that causes the elastic bending deformation of the pinion 2 so that the pinion 2 is pressed against the face gear 1. The uncured resin to be filled is preferably one that continues to exhibit elastic force even when cured, but may be one that does not exhibit elastic force after curing.

[Second Embodiment]
FIG. 6 shows the gear device of the second embodiment.
The gear device of the present embodiment is different from the first embodiment in that the urging mechanism 7 is configured by screwing the case 8 with a screw 8 that pushes the fitting member 5a toward the face gear 1 side. ing.

In this embodiment, the pressing force of the pinion 2 against the face gear 1 can be easily adjusted by appropriately adjusting the screwing depth of the screw 8.
Other configurations are the same as those of the first embodiment.

[Third Embodiment]
FIG. 7 shows a gear device according to a third embodiment.
The gear device of the present embodiment includes a V-shaped holding surface 5b in which the fitting member 5a holds the cylindrical outer peripheral surface of the second bearing 4b from the radial direction, and the V-shaped holding surface 5b is the pinion 2 This is different from the first embodiment in that it constitutes a swing restricting portion that prevents the face gear 1 from swinging along the plane direction.

With this configuration, the two portions of the holding surface 5b always come into contact with the outer peripheral surface of the second bearing 4b, so that the tip side shaft portion 2c of the pinion 2 can be held without rattling.
Other configurations are the same as those of the first embodiment.

[Fourth Embodiment]
8 and 9 show a gear device of the fourth embodiment.
As shown in FIGS. 8 and 9, the fitting member 5 a is configured by a magnet 10 having a semicircular holding surface 5 b as viewed in the direction along the first rotation axis X. On the other hand, the second bearing 4b is made of a magnetic material. Thus, the magnet 10 is disposed at least in a portion of the holding portion 5 that faces the distal end side shaft portion 2c.
In the magnet 10, both end portions 10a and 10c in the circumferential direction are set to a negative electrode, and the central portion 10b is set to a positive electrode. The magnet 10 is set such that the region of the central portion 10b is larger than the regions of both end portions 10a and 10c in the circumferential direction. For this reason, the outer peripheral surface of the second bearing 4b is influenced by the magnetic force of the central portion 10b of the magnet 10 and is magnetized to the negative electrode.

  In this way, the magnet 10 and the second bearing 4 b are attracted, and the distal end side shaft portion 2 c of the pinion 2 is held by the holding portion 5. As a result, vibration during rotation of the pinion 2 can be reduced, and the pinion 2 can transmit the rotational force to the face gear 1 in a stable posture.

  On the other hand, the second bearing 4b and both end portions 10a, 10c of the magnet 10 have the same polarity. For this reason, if there is a gap between the both end portions 10a, 10c and the second bearing 4b, the second bearing 4b receives a repulsive force from the both end portions 10a, 10c and is separated from the both end portions 10a, 10c. Held at the position. Thereby, the axial runout of the horizontal direction of the front end side shaft part 2c of the pinion 2 can be suppressed.

In addition, the setting of the polarity of the magnet 10 is arbitrary, and the attraction and repulsion states between the magnet 10 and the second bearing 4b can be set as appropriate.
Other configurations are the same as those of the first embodiment.

[Modification of Fourth Embodiment]
FIG. 10 shows a modification of the gear device of the fourth embodiment.
In the present embodiment, the tip side shaft portion 2 c of the pinion 2 is made of a magnetic material, and the sliding member 11 is disposed on the inner peripheral surface of the magnet 10. For this reason, the front end side shaft portion 2 c of the pinion 2 attracted to the central portion 10 b of the magnet 10 can rotate while sliding with respect to the sliding member 11. Thereby, the rotational resistance of the pinion 2 is reduced.
The sliding member 11 is configured integrally with the magnet 10 or is fixed to the inner peripheral surface of the magnet 10 by adhesion or the like.
Other configurations are the same as those of the fourth embodiment.

[Other Embodiments]
1. A gear device in which the second rotation axis Y does not have an offset with respect to the first rotation axis X may be used.
2. A gear device having a disk-shaped face gear 1 may be used.
3. In the above embodiment, the pinion 2 may not include the second bearing 4b.

  The present invention is not limited to the gear device equipped in the AMT for automobiles, and can be used for a gear device for various purposes in which a pinion and a face gear mesh.

1 Face gear 2 Pinion 2b Base side shaft (first end)
2c Tip side shaft (second end)
3 Case 4b Second bearing 5 Holding portion 5b Holding surface (swing restricting portion)
5c Pull-out restricting part 7 Energizing mechanism 7a Resin filling part 10 Magnet M Electric motor (drive part)
X 1st rotation axis Y 2nd rotation axis

Claims (7)

A pinion having a first end connected to the drive unit and a second end different from the first end, and drivingly rotating around the first rotation axis;
A face gear that rotates around a second rotation axis different from the first rotation axis and meshes with the pinion; and a case that houses the pinion and the face gear;
The second end portion of the pinion is held at a portion facing the face gear, and a holding portion is provided inside the case to prevent the pinion from moving away from the face gear when the pinion is driven. A gear device.   The gear device according to claim 1, wherein the holding portion includes a swing restricting portion that prevents the pinion from swinging along a planar direction of the face gear.   The gear device according to claim 1, wherein the holding portion includes a biasing mechanism that adjusts a biasing force that directs the second end portion of the pinion toward the face gear.   The gear device according to claim 3, wherein the urging mechanism includes a resin filling portion adjacent to the holding portion so as to move the holding portion toward the pinion.   The gear device according to any one of claims 1 to 4, wherein a bearing is attached to the second end portion of the pinion.   The gear device according to claim 5, wherein the holding portion includes a restriction portion that prevents the bearing from coming out of the pinion in a direction along the first rotation axis. The second end of the pinion is made of a magnetic material;
The gear apparatus as described in any one of Claims 1-6 by which the site | part which opposes the said 2nd end part among the said holding parts is comprised with the magnet.

Images