JP2008014392A - Gear meshing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gear meshing structure sufficiently securing the deflecting function of a tooth portion to prevent backlash while securing the positioning function of gears to mesh with each other. <P>SOLUTION: In the gear meshing structure, a bridge member 31 is used to form a slit 14 between rack teeth 12 of a sector gear 10 and a body 11 for permitting the deflection of the rack teeth 12, and both ends 31E1, 31E2 of the bridge member 31 is fixed to (integrally formed with) both end connection portions 14E1, 14E2 of the slit 14 as a deflection non-influenced portion 15. The bridge member 31 has a positioning recessed portion 32 formed for engaging with a positioning pin 22 of a pinion gear 20. Thus, the deflection of the rack teeth 12 is permitted without precluding the function of the slit 14, and the sector gear 10 and the pinion gear 20 are easily positioned to initially mesh with each other without the need for visual check. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gear meshing structure.

As a conventional gear meshing structure, when a rotation transmitted from one to the other by two gears meshed with each other is a reciprocating rotation, a meshing structure of a sector gear and a pinion gear is generally used. Used in regulators and wiper drive units, or drive units that tilt the louver that adjusts the blowing direction at the air-conditioning air outlet of an air conditioner.When rotating in a reciprocating manner using sector gears and pinion gears in this way The backlash of the gear is generated at the rotation direction switching portion, and the smooth reciprocation is hindered.

  Therefore, for example, in the louver drive section of the air-conditioning air outlet, the sector gear is composed of two gears arranged coaxially so as to be able to rotate relative to each other with a slight pitch shift, and an elastic force between the two gears. By giving force, the occurrence of backlash is prevented (see, for example, Patent Document 1).

  However, in this case, it is necessary to prepare two gears with different pitches, and to have a resilient force between them, so that the structure is complicated and the cost is inevitably increased.

For this reason, as a means for preventing backlash with a simple structure, a slit is formed between the main body part along the tooth part forming part of at least one gear, and the tooth part is bent along with the crushing of the slit. Thus, there is one that can prevent backlash with the resilience at that time (see, for example, Patent Document 2).
JP 2003-237361 A JP 2000-355212 A

   By the way, in the meshing structure of the gears reciprocally rotated in this way, in order to match the initial position at the time of reciprocating rotation, positioning portions such as marks are provided on the respective gears, and these positioning portions are aligned at the time of assembly.

  If such a positioning part is formed by engaging parts that engage with each other, the rigidity in the vicinity of the tooth part is increased, and the degree of freedom of bending of the tooth part may be reduced, and backlash may not be sufficiently prevented.

  Therefore, the present invention provides a gear meshing structure that can sufficiently secure a bending function of a tooth portion for preventing backlash while securing a positioning function of gears meshing with each other.

  The invention according to claim 1 is a gear meshing structure, and is provided between the tooth portion formed on the outer peripheral portion of the main body portion and the tooth portion and the main body portion on the inner peripheral side of the tooth portion. A first gear having a bending allowance portion that allows the tooth portion to bend; a second gear that meshes with the tooth portion of the first gear; and the second gear. A positioning part for adjusting the meshing position, and a member fixed to a bending non-influencing part that does not affect the bending of the tooth part of the first gear, and is engaged with the positioning part of the second gear to And a member having a positioning portion for adjusting the meshing position of the gear.

  The invention according to claim 2 is the gear meshing structure according to claim 1, wherein the positioning portion of the second gear is a projection, and the positioning portion of the first gear is the It is a positioning recessed part engaged with a projection part, It is characterized by the above-mentioned.

  A third aspect of the present invention is the gear meshing structure according to the first or second aspect, wherein the bending non-influencing portion connects the tooth portion and the main body portion at both ends of the bending allowing portion. It is a both-ends connection part, The said member is a bridge-like member provided along the said tooth | gear part, Comprising: The both-ends part is a bridge-like member fixed to the said both-ends connection part, It is characterized by the above-mentioned.

  A fourth aspect of the present invention is the gear meshing structure according to the third aspect, wherein one of both end portions of the bridge-like member is rotatable to one of the both end connecting portions via a hinge portion. The other end of the bridge-like member is detachably engaged with the other end of the both-end connecting portion.

  A fifth aspect of the present invention is the gear meshing structure according to the third aspect, wherein the bridge-shaped member is integrally formed with the first gear.

  A sixth aspect of the present invention is the gear meshing structure according to the fifth aspect, wherein both end portions of the bridge-shaped member are integrally formed with the both end connecting portions.

  The invention according to claim 7 is the gear meshing structure according to claim 1 or 2, wherein the deflection non-influencing portion is a main body portion of the first gear, and the member is one side surface of the main body portion. It is the plate-shaped member fixed to.

  According to the first aspect of the present invention, since the bending of the tooth portion is allowed by the bending allowance portion, backlash can be efficiently prevented. Further, the positioning of the first gear and the second gear can be performed by both positioning portions. At this time, since the member forming the positioning portion of the first gear is fixed to the bending non-affected portion, the bending of the tooth portion is allowed without hindering the function of the bending allowing portion, and the backlash is sufficient. Can be prevented.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the protrusion as the positioning part of the second gear engages with the concave part as the positioning part of the first gear to engage the first part. -Since the second gears are positioned, the structure is simple. Further, positioning can be performed accurately and easily without visual observation.

  According to a third aspect of the present invention, in addition to the effects of the first and second aspects, the member is formed of a bridge-shaped member disposed along the tooth portion of the first gear, and both end portions thereof are formed. Is fixed to both end connecting portions provided on both ends of the bending allowance portion, the rigidity of the bridge-like member is prevented from affecting the bending allowance portion, and thus backlash can be efficiently prevented.

  According to the fourth aspect of the invention, in addition to the effect of the third aspect, when the first gear is assembled, the one end portion of the bridge-shaped member is centered on the hinge portion provided at the one end portion of the bending allowance portion. It is only necessary to rotate and engage the other end portion with the other end portion of the bending allowance portion, and it is possible to simplify the assembling property of the member having the positioning portion and to improve the assembling workability.

  According to the fifth and sixth aspects of the invention, in addition to the effect of the third aspect of the invention, since the bridge-shaped member is integrally formed with the first gear, the number of parts is small and parts management is easy. There is an advantage to become.

  According to the seventh aspect of the invention, in addition to the effects of the first and second aspects, the plate-like member as the member forming the positioning portion is fixed to the main body portion of the first gear. The formed plate-like member can be prevented from affecting the bending allowance portion, and consequently backlash can be efficiently prevented.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 3 show a first embodiment of a gear meshing structure according to the present invention, FIG. 1 is a front view of a state in which a first gear and a second gear are meshed at an alignment position, and FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG.

  As shown in FIGS. 1 to 3, the gear meshing structure of the present embodiment is meshed with a sector gear 10 as a first gear in which rack teeth 12 are formed on the outer periphery of the main body 11 and the sector gear 10. This is applied to the meshing portion with the pinion gear 20 as the second gear.

  On the sector gear 10 side and the pinion gear 20 side, positioning portions 13 and 21 for adjusting the meshing positions of both gears 10 and 20 are provided, respectively, and between the rack teeth 12 and the main body portion 11 of the sector gear 10. A slit 14 is formed as a bending allowance portion that allows the rack teeth 12 to be bent.

  And in this invention, the positioning part 13 of the said sector gear 10 is formed in the member 30 with the sector gear 10, and the member 30 is fixed to the bending non-influence part 15 which does not influence the bending of the rack tooth | gear 12 of the sector gear 10. It has become.

  In the present embodiment, the sector gear 10 is used as a drive lever of an air mix door that adjusts the opening between an outside air introduction port and an inside air introduction port of an air conditioner mounted on an automobile, and is rotated by an electric motor that is rotationally controlled. The rotation amount of the pinion gear 20 is transmitted to the sector gear 10, and the rotation axis of the air mix door fixed to the rotation center hole 16 of the sector gear 10 is controlled to rotate.

  The main body 11 of the sector gear 10 has a fan shape centered on the rotation center hole 16, the rack teeth 12 are formed on the outer periphery thereof, and the slits 14 are formed along the inner periphery of the rack teeth 12. Is formed in an arc shape.

  In this embodiment, the slit 14 is composed of an outer peripheral side main slit 14a and an inner peripheral side sub slit 14b arranged concentrically, and the sub slit 14b is formed shorter than the main slit 14a. The rack teeth 12 are allowed to bend and deform by the main slit 14a and the sub slit 14b.

  In the sector gear 10 configured as described above, the bending non-influencing portion 15 that does not affect the bending deformation of the rack teeth 12 includes both end connecting portions 14E1 that connect the main body portion 11 and the rack teeth 12 at both ends of the slit 14. 14E2 and the entire main body 11.

  Here, the member 30 is formed as a bridge-shaped member 31 provided along the rack teeth 12, and both end portions 31 </ b> E <b> 1 and 31 </ b> E <b> 2 are fixed to both end connection portions 14 </ b> E <b> 1 and 14 </ b> E <b> 2 of the slit 14. In this embodiment, the bridge-shaped member 31 is formed integrally with the sector gear 10 as the first gear.

  As shown in FIG. 2, the bridge-shaped member 31 is formed in a bow shape with a member having a rectangular cross section, its both end portions 31E1 and 31E2 are bent toward the center of the main body portion 11, and the bent pieces are connected to both ends. It is integrally formed with the parts 14E1 and 14E2.

  At this time, the positioning portion 21 of the pinion gear 20 is a positioning pin 22 as a protrusion, and the positioning portion 13 of the sector gear 10 is formed as a positioning recess 32 that engages with the positioning pin 22.

  That is, in this embodiment, as shown in FIG. 1, the bridge-shaped member 31 is recessed on the main body 11 side at a portion corresponding to the initial meshing position of the pinion gear 20, and the recessed portion is used as the positioning recess 32. The initial meshing position is when the positioning pin 22 of the pinion gear 20 is positioned at the bottom of the positioning recess 32.

  According to the gear meshing structure of the present embodiment having the above-described configuration, the bridge-like member 31 in which the positioning recess 32 of the sector gear 10 is formed is fixed to the both-end coupling portions 14E1 and 14E2 of the slit 14 which is the bending non-influencing portion. The deflection of the rack teeth 12 is allowed without impeding the function of the slits 14.

  For this reason, when the pressing force which acts on the meshing part of the rack teeth 12 and the pinion gear 20 changes, the rack teeth 12 are allowed to bend and backlash can be efficiently prevented.

  In the present embodiment, the positioning of the sector gear 10 and the pinion gear 20 is performed by engaging the positioning pin 22 formed on the pinion gear 20 with the positioning recess 32 formed on the bridge-shaped member 31. Positioning can be performed accurately and easily without visual inspection.

  Further, the member 30 is formed of a bridge-shaped member 31 disposed along the rack teeth 12, and both end portions 31E1 and 31E2 are fixed to the both end connecting portions 14E1 and 14E2 of the slit 14 (in this example, integrally formed). As a result, the rigidity of the bridge-shaped member 31 can be prevented from affecting the slit 14 and, in turn, backlash can be efficiently prevented.

  The effects of this embodiment are listed below.

  The meshing structure of the gear according to the present embodiment includes a main body part 11, a tooth part 12 formed on the outer peripheral part of the main body part 11, and the tooth part 12 and the main body part 11 on the inner peripheral side of the tooth part 12. A first gear 10 (sector gear in this example) having a bending allowance part 14 (slit 14 in this example) provided between and allowing the tooth part 12 to bend, and a tooth part of the first gear 10 The second gear 20 that meshes with the gear 12, the positioning portion 21 that is provided on the second gear 20 to match the meshing positions of the two gears 10 and 20, and the teeth 12 of the first gear 10 are bent. A member 30 fixed (integrally formed in this example) to the unaffected bending non-influencing portion 15 for engaging with the positioning portion 21 of the second gear 20 to match the meshing positions of the two gears 10, 20. And a member 30 having the positioning portion 13.

  Therefore, since the member 30 having the positioning portion 13 is fixed to the bending non-influencing portion 15, the bending of the tooth portion 12 is allowed without impeding the function of the bending allowing portion 14. It can be prevented efficiently. Of course, the positioning of the first gear 10 and the second gear 20 can be performed by the positioning portion 13 formed on the member 30 and the positioning portion 21 formed on the second gear 20.

  Further, in the gear meshing structure of the present embodiment, the positioning portion 21 of the second gear 20 is a protrusion 22 and the positioning portion 13 of the first gear 10 is engaged with the protrusion 22. This is a positioning recess 32.

  Therefore, the protrusion 22 as the positioning portion 21 of the second gear 20 is engaged with the concave portion 32 as the positioning portion 13 of the first gear 10, so that the positioning of the first and second gears 10, 20 is performed. Therefore, the positioning can be performed accurately and easily without visual observation.

  Further, in the gear meshing structure of the present embodiment, the bending non-influencing portion 15 is both end connecting portions 14E1 and 14E2 that connect the tooth portion 12 and the main body portion 11 at both ends of the bending allowing portion 14. The member 30 is a bridge-shaped member provided along the tooth portion 12, and both the end portions 31E1 and 31E2 are fixed to the both-end connecting portions 14E1 and 14E2.

  Therefore, by forming the member 30 having the positioning portion 13 with the bridge-like member 31 provided along the tooth portion 12 of the first gear 10, the rigidity of the bridge-like member 31 affects the deflection allowing portion 14. This can prevent backlash efficiently.

  In the gear meshing structure of the present embodiment, the bridge-shaped member 31 is integrally formed with the first gear 10. More specifically, both end portions 31E1 and 31E2 of the bridge-shaped member 31 are integrally formed with the both end connecting portions 14E1 and 14E2. Therefore, there are advantages that the number of parts is small and parts management is easy.

(Second Embodiment)
4 and 5 show a second embodiment of the present invention, in which the same components as in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 5 is a perspective view showing a state in which the first gear and the second gear mesh with each other in the opened state, and FIG. 5 shows that the first gear and the second gear mesh with each other in a state where the bridge-shaped member is properly attached. It is a perspective view which shows the state which carried out.

  In the present embodiment, one of the both end portions 31E1 and 31E2 (that is, one end portion 31E1) of the bridge-shaped member 31 is one of the both end connecting portions 14E1 and 14E2 provided at both end portions of the slit 14 (that is, one connecting portion). 14E1) and the other end of the both end portions 31E1 and 31E2 (that is, the other end portion 31E2) is connected to the other end of the both end connecting portions 14E1 and 14E2 (that is, the other end portion 31E2). The point which is detachably engaged with the other connecting portion 14E2) is different from the first embodiment.

  The engagement structure of the other end portion 31E2 of the bridge-shaped member 31 includes an engagement pin 34 protruding from the main body portion 11 near the other connecting portion 14E2 of the slit 14 and the other end portion 31E2 of the bridge-shaped member 31. An engagement hole 35a formed in the distal end portion of the bent piece 35 is bent in the direction of the main body portion 11 and is detachably fitted to the engagement pin 34.

  Of course, the bridge-shaped member 31 is formed with a positioning recess 32 for engaging the positioning pin 22 of the pinion gear 20.

  With the above-described configuration, according to the gear meshing structure of the present embodiment, one end portion 31E1 of the bridge-like member 31 is rotatably connected to one connecting portion 14E1 of the slit 14 via the hinge portion 33, and the other end. Since the part 31E2 is detachably engaged with the other connecting part 14E2, when the sector gear 10 is assembled, the bridge-like member 31 is rotated around the hinge part 33, and the other end 31E2 is connected to the other of the slits 14. In the structure in which the bridge member 31 is formed separately from the sector gear 10, the assembling property of the bridge member 31 is simplified and the assembling workability is improved.

(Third embodiment)
6 to 8 show a third embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 6 is a first gear. FIG. 7 is a cross-sectional view taken along line BB in FIG. 6, and FIG. 8 is an alignment of the first gear and the second gear. It is a perspective view of the state meshed | engaged in the position.

  In this embodiment, the point from which the member 30 is formed with the plate-shaped member 36 as shown in FIGS. 6-8 differs from 1st and 2nd embodiment. The plate-like member 36 is fixed to one side surface 11 a of the main body 11 that is the bending non-influencing portion 15, and an outer peripheral portion thereof covers one side of the rack teeth 12.

  That is, the plate-like member 36 is formed in a fan shape along a predetermined range of the outer peripheral portion of the main body portion 11, and the inner peripheral portion 36a thereof is coupled to the one side surface 11a of the main body portion 11 as shown in FIG. Further, an outer peripheral portion 36b corresponding to the rack teeth 12 is lifted from the inner peripheral portion 36a in a stepped manner to cover one side of the rack teeth 12.

  In the present embodiment, the plate-like member 36 is formed with an opening 36 c that avoids the protrusion 17 of the main body portion 11.

  Of course, the plate-like member 36 is formed with a positioning recess 32 that engages with the positioning pin 22 of the pinion gear 20 in the outer peripheral portion 36b.

  With the above-described configuration, according to the gear meshing structure of the present embodiment, since the plate-like member 36 formed as the member 30 is fixed to the main body portion 11, the plate-like member 36 in which the positioning recess 32 is formed affects the slit 14. And, in turn, backlash can be efficiently prevented.

  By the way, although the gear meshing structure of the present invention has been described by taking the first to third embodiments as examples, the present invention is not limited to these embodiments, and various other embodiments are adopted without departing from the gist of the present invention. For example, the bending allowance portion is not limited to the slit 14 and may be a structure that allows the rack teeth 12 to be bent, for example, a thin wall portion, and the slit 14 is formed by the main slit 14a and the sub slit 14b. It is not limited to a double structure, but may be a single structure or a triple structure or more.

The front view of the state which the 1st gear and the 2nd gear in 1st Embodiment of this invention meshed | engaged in the alignment position. Sectional drawing along the AA line in FIG. The perspective view of the state which the 1st gear and the 2nd gear in 1st Embodiment of this invention meshed | engaged in the alignment position. The perspective view which shows the state which the 1st gear and the 2nd gear meshed in the state in which the bridge-shaped member in 2nd Embodiment of this invention was opened. The perspective view which shows the state which the 1st gear and the 2nd gear meshed in the state in which the bridge-shaped member in 2nd Embodiment of this invention was attached normally. The front view of the state which the 1st gear and the 2nd gear in 3rd Embodiment of this invention meshed | engaged in the alignment position. Sectional drawing along the BB line in FIG. The perspective view of the state which the 1st gear and 2nd gear in 3rd Embodiment of this invention meshed | engaged in the alignment position.

Explanation of symbols

10 Sector gear (first gear)
DESCRIPTION OF SYMBOLS 11 Main body part 12 Rack tooth | gear 13 Positioning part 14 Slit (deflection allowable part)
14E1, 14E2 Slit connection portion 15 Deflection non-influence portion 20 Pinion gear (second gear)
21 Positioning part 22 Positioning pin (protrusion)
31 Bridge-shaped member
32 Positioning recessed part 33 Hinge part 36 Plate-shaped member (member)

Claims (7)

The tooth part (12) formed on the outer peripheral part of the main body part (11) and the tooth provided between the tooth part (12) and the main body part (11) on the inner peripheral side of the tooth part (12) A first gear (10) having a deflection allowing portion (14) that allows the deflection of the portion;
A second gear (20) meshing with the teeth (12) of the first gear (10);
A positioning portion (21) provided on the second gear (20) for aligning the meshing positions of both gears (10, 20);
A member fixed to a bending non-influencing portion (15) that does not affect the bending of the tooth portion (12) of the first gear (10), the positioning portion (21) of the second gear (20); And a member having a positioning portion (13) for engaging and aligning the meshing positions of both gears (10, 20). The gear meshing structure according to claim 1,
The positioning part (21) of the second gear (20) is a protrusion (22), and
The gear meshing structure, wherein the positioning portion (13) of the first gear (10) is a positioning recess (32) that engages with the protrusion (22). The gear meshing structure according to claim 1 or 2,
The bending non-influencing portion (15) is a both-end connecting portion (14E1, 14E2) that connects the tooth portion (12) and the main body portion (11) at both ends of the bending allowing portion (14).
The member (30) is a bridge-like member provided along the tooth portion (12), and both end portions (31E1, 31E2) are fixed to the both end connection portions (14E1, 14E2). A gear meshing structure characterized by being a member (31). The gear meshing structure according to claim 3,
One of both end portions (31E1, 31E2) of the bridge-like member (31) is rotatably connected to one of the both end connecting portions (14E1, 14E2) via a hinge portion (33), and the bridge A gear meshing structure characterized in that the other of both end portions (31E1, 31E2) of the shaped member (31) is detachably engaged with the other of the both end connecting portions (14E1, 14E2). The gear meshing structure according to claim 3,
The gear-meshing structure, wherein the bridge-shaped member (31) is integrally formed with the first gear (10). The gear meshing structure according to claim 5,
The gear meshing structure, wherein both end portions (31E1, 31E2) of the bridge-like member (31) are integrally formed with the both end connecting portions (14E1, 14E2). A gear meshing structure according to claim 1 or 2,
The deflection non-influence portion (15) is a main body portion (11) of the first gear,
The gear meshing structure, wherein the member (30) is a plate-like member (36) fixed to one side surface of the main body (11).

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