JPH04114839U - Driving force connection/disconnection mechanism for vehicle mirrors - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To reduce the vertical dimension of the driving force connection/disconnection mechanism of a vehicle mirror and to keep the force required for driving force connection/disconnection constant. [Structure] Consisting of a base member 1 fixed to the vehicle body side, and a mirror body that supports the mirror and is rotatably attached to a fixed shaft 2 provided on the base member, the gear is rotated by the power of the drive source. In a vehicle mirror that rotates the mirror body, the driving force connection/disconnection mechanism 31 includes a ring gear 25 provided on the outer periphery of a fixed shaft and meshing with a gear, and a first engagement groove 27 formed on the inner periphery of the ring gear. , a ball member 30 that engages with the second engagement groove 23 formed on the outer periphery of the fixed shaft and the first and second engagement grooves to lock the ring gear on the fixed shaft side; A spring that presses downward forms an inclined surface that resists the pressing force of the spring 34 and disengages the ball member upward from the first engagement groove when an overload is applied to the mirror body side. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a driving force connection/disconnection mechanism for vehicle mirrors.

0002

[Conventional technology]

Some vehicle mirrors installed in cars and other vehicles are electrically foldable. A vehicle mirror like this usually consists of a base member fixed to the vehicle body and a support member for the mirror. and a mirror body rotatably attached to a fixed shaft provided on the base member. A final speed reducer provided on the mirror body by the power of a drive source such as a motor. The mirror body is rotated by rotating the gear around the fixed axis.

0003 By the way, in such a vehicle mirror, the mirror body is rotated while the mirror body is rotating. The main body may hit a telephone pole etc. and become unable to rotate. In such cases, the motor and Since overload is applied to the motor and reduction gear group, a disconnection mechanism is installed to cut off the driving force of the motor. It's on. FIG. 5 shows a longitudinal sectional view of such a driving force cutting mechanism, in which 100 is fixed to the vehicle body side. 101 is a fixed shaft fixed to the base member; 102 is a fixed shaft 101; A ring gear 103 is rotatably and vertically movably fitted to the ring gear 102. 104 is an engagement ring fixed to the fixed shaft 101, and 105 is an engagement ring fixed to the top surface. The upper part of the steel ball 103 is engaged with the groove 105 in the groove formed in the matching ring 104. , this engagement is maintained by the elasticity of the spring 106. The outer periphery of the ring gear 102 is supported by the mirror body side and is connected from the motor side. The final reduction gear 107, which transmits the driving force of the When the gear 107 rotates and revolves around the outer periphery of the ring gear 102, the The rotation of the main body of the roller is performed.

0004 On the other hand, while the mirror body is rotating, the mirror body hits a utility pole, etc., and the motor is activated. If the mirror body becomes unable to rotate despite the Due to the driving force of The motor and reduction gear group rotate as the drive force is cut off. Prevent overload from being applied.

[0005]

[Problem that the idea aims to solve]

However, in such a vehicle mirror, the ring gear 102 and the engagement ring 1 04 are overlapped vertically, so the vertical dimension of the driving force connection/disconnection mechanism increases. There is a case. Also, when the steel ball 103 leaves the groove 105, the ring gear 102 Since the ring gear 102 will be moved downward, the ring gear 102 should be positioned upward by this distance in advance. This is also the cause of the increase in the vertical dimension of the driving force connection/disconnection mechanism. becomes.

[0006] Also, when the driving force is turned off, that is, when the steel ball 103 leaves the groove 105, Since the ring gear 102 moves down along the fixed shaft 101, the ring gear 102 and the fixed Friction occurs between the fixed shaft 101 and this friction causes the steel ball 103 to separate from the groove 105. There is a problem in that it is difficult to maintain a constant force when doing so.

[0007]

[Means to solve the problem]

In order to solve the above problems, the present invention has a base member fixed to the vehicle body side and a mirror. A mirror that supports the base member and is rotatably attached to a fixed shaft provided on the base member. The gear provided on the mirror body is driven by the power of the drive source. A vehicle mirror that rotates around a fixed axis to rotate the mirror body. and a driving force connection/disconnection mechanism for connecting/disconnecting the power of the drive source between the fixed shaft and the gear. The drive force connection/disconnection mechanism is provided on the outer periphery of the fixed shaft and meshes with the gear. a ring gear, a first engagement groove formed on the inner peripheral side of the ring gear, and a first engagement groove formed on the inner circumferential side of the ring gear; A second engagement groove formed on the outer periphery is engaged with the first engagement groove and the second engagement groove. , a ball member that locks the ring gear on the fixed shaft side through this engagement, and a ball member that locks the ring gear on the fixed shaft side; and a spring that presses the lever member downward, and the first engagement groove includes a mirror. When an overload is applied to the main body side, the ball member resists the pressing force of the spring. It is characterized by forming an inclined surface that causes the first engagement groove to separate upwardly from the first engagement groove.

[0008]

[Effect]

Normally, the ball member engages with the first engagement groove of the ring gear and the second engagement groove of the fixed shaft. The ring gear is fixed to the fixed shaft side. Therefore, fixing the ring gear as before Eliminates the need for an engagement ring that sometimes engages steel balls, reducing the vertical dimensions of the driving force disconnection mechanism. can be reduced. Also, since the ring gear does not move up and down, the dimensions for this It can be made smaller, and there is no frictional force between it and the fixed shaft, so it is easy to disconnect and disconnect the driving force. The required force can be kept constant.

[0009]

【Example】

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a foldable door mirror, and FIG. 2 is an exploded view of the same essential parts. In the figure, 1 is a base member that is fixedly supported on the vehicle body side, and the center step part 1 of the base member 1 is A is integrally provided with a cylindrical fixed shaft 2, and a plurality of engagements are provided on the upper surface of the central step 1a. The matching grooves 1b... are formed radially. Further, the central step portion 1a on the upper surface of the base member 1 Appropriate locations around the surrounding area are for mirror body stoppers that engage with the bracket 3 side, which will be described later. A projecting piece 1c is formed extending in the radial direction of the fixed shaft 2.

0010 A base portion 3a of a bracket 3 is rotatably fitted onto the fixed shaft 2, and the base portion 3a of the bracket 3 is rotatably fitted to the fixed shaft 2. A mirror drive unit 5 is fixed to the outside of the bracket 3 so that the mirror drive unit 5 is fixed to the outside of the bracket 3.

[0011] A spherical portion 9 is formed on the front side of this mirror drive unit 5, and this spherical portion 9 is used to drive the mirror. A mirror holder (not shown) supporting the mirror holder (not shown) is swingably supported. Specifically, the above The ball portion 9 is fitted into the receiving portion of the mirror holder and formed on the mirror holder. Locking portions 9c and 9d formed on the sides of the spherical portion 9 are engaged with the groove portion having a rectangular cross section.

0012 Motors 14 and 15 are provided in the mirror drive unit 5 as shown in FIG. , a worm 14b fixed to the rotating shafts 14a, 15a of these motors 14, 15. , 15b are meshed with gears (not shown) fixed to the outer peripheries of the operating rods 16, 17. operation Ball portions 16a, 17a are formed at the tips of the rods 16, 17, and these ball portions 16a, 1 7a is fitted into a receiving portion formed on the mirror holder.

[0013] On the other hand, on the lower surface of the base 3a of the bracket 3, there are a plurality of holes corresponding to the engagement grooves 1b. Engagement holes 3b are formed, and steel balls 20 are fitted into the engagement holes 3b. One of these steel balls 20 The portion protrudes downward through the engagement hole 3b, and this protruding portion engages with the engagement groove 1b. . These engagement grooves 1b and steel balls 20 constitute a positioning mechanism 21.

[0014] A vertical groove 23 having a substantially semicircular cross section is provided on the outer periphery of the large diameter portion 2a of the fixed shaft 2. ... is formed, and the upper end side of this groove 23 is formed to be open above the large diameter portion 2a. Fixed A ring gear 25 is rotatably fitted to the upper outer periphery of the large diameter portion 2a of the shaft 2. A washer w is arranged between the lower surface of the gear 25 and the stepped portion 3c of the bracket 3. The lower surface of the ring gear 25 is pressed against the upper surface of the stepped portion 3c of the bracket 3 by the washer w. to maintain the specified gap.

[0015] A hanging portion 25a is formed at the lower end of the outer circumference of the ring gear 25, and this hanging portion 25a is a stepped portion. 3c is rotatably fitted to the upper outer periphery. Also, the inner circumference of the ring gear 25 has an inclined step. 26, and three engaging grooves 27 are formed at equal intervals on the upper surface of this stepped portion 26. The engagement groove 27 consists of inclined parts 27a, 27b and a bottom part 27c, and the inclined parts 27a, 2 7b is tapered with respect to the axial direction A of the ring gear 25, as shown in FIG. (C, D directions), and a direction B perpendicular to the axis of the ring gear 25 as shown in FIG. It is also tapered (in the E direction). Furthermore, the bottom portion 27c is also E as shown in FIG. tilt in the direction.

[0016] The groove 23 of the fixed shaft 2 and the engagement groove 27 of the ring gear 25 have both 23 and 27. A steel ball 30 that engages with the ring gear 25 is provided, and the engagement of the steel ball 30 causes the ring gear 25 to The fixed shaft 2 remains fixed. Driven by this steel ball 30, groove 23, and engagement groove 27 A force connection/disconnection mechanism 31 is configured. A spring receiver 28 is fixed to the upper end of the fixed shaft 2, and the spring receiver 28 and the steel ball 30 are connected to each other. A spring 34 is arranged between the spring receiving plate 29 that abuts the end, and the steel ball 30 is held constant. Press down with the elasticity of.

[0017] A support portion 32 is provided above the base portion 3a of the bracket 3, and this support portion 32 It supports the motor 33 and shaft 36. A worm wheel is provided on the upper outer periphery of the shaft 36. A gear 36c is formed on the lower outer periphery of the worm wheel 36b. b engages with a worm 33b provided on the rotating shaft 33a of the motor 33.

[0018] A boss portion 38 is formed on the lower surface of the support portion 32, and the boss portion 38 and the bracket 3 side are connected to each other. A support shaft 39 is fixedly installed between. This support shaft 39 has a ring gear 40 and a ring gear. 41 is rotatably provided, and a large diameter gear 40a and a small diameter gear are arranged on the outer periphery of the ring gear 40. A gear 40b is formed, and the gear 40a is screwed into the gear 36c. Outside ring gear 41 Similarly, a large diameter gear 41a and a small diameter gear 41b are formed around the circumference.

[0019] A support shaft 43 is formed near the boss portion 38 on the lower surface of the support portion 32, and a small The tip of the diameter portion 43a fits into a support shaft 45 formed on the bracket 3 side. of the support shaft 43 A ring gear 46 is rotatably provided on the outer periphery of the ring gear 46. A gear 46a and a small diameter gear 46b are formed, and the gear 46a is a gear of the ring gear 40. The gear 46b is screwed into the gear 41a of the ring gear 41. Further, a ring gear 48 is provided on the outer periphery of the support shaft 45, and this ring gear 48 has a large diameter gear. It consists of a gear 48a and a small diameter gear 48b, and the gear 48a is the gear of the ring gear 41. 41b, and the gear 48b is screwed to the outer periphery of the ring gear 25.

[0020] The motor 33, each gear 40, 41, 46, 48, fixed shaft 2, etc. are covered by a cover 50. and the cover 50, mirror holder, mirror, etc. are fixed to the bracket 3. These are covered with a mirror housing 51 to protect them. The above-mentioned bracket 3, mirror drive unit 5, mirror holder, mirror, and motor fixed with the motor 33, each gear 40, 41, 46, 48, mirror housing 51, etc. A mirror body 52 that tilts with respect to the fixed axis 2 is configured.

[0021] In the above, the switch in the vehicle interior is pressed while the mirror body 52 is in the use position. When the motor 33 is operated, this rotation is caused by the worm 33b and the worm wheel. The signal is transmitted to the shaft 36 via the gear 36b, and is transmitted from there via the gear 36c and the gear 40a. is transmitted to the ring gear 40. Furthermore, this rotation is transmitted to the ring gear 46 via the gear 40b. It is transmitted from here to the ring gear 41 via gear 46b and gear 41a, and here The signal is transmitted to the ring gear 48 via gear 41b and gear 48a.

[0022] Here, the ring gear 25 is fixed to the fixed shaft 2 by the steel balls 30. Therefore, the ring gear 48 rotates and revolves around the outer circumference of the ring gear 25, and the mirror body 52 tilts between a use position and a storage position. At this time, the steel ball 20 is inserted from the engagement groove 1b. The steel ball 20 is detached from the mirror body 52 at the use position or the storage position and is returned to another position. It engages with the engagement groove 1b.

[0023] On the other hand, the mirror body 52 hits an obstacle such as a telephone pole during the tilting operation, and the tilting stops. If the ring gear 48 stops rotating, even in such a case, the motor The motor 33 will still continue to operate, and if this continues for a long time, the motor 33 and Each gear may be overloaded for a long time, resulting in negative effects. However, this In such a case, rotational force is applied to the ring gear 25 due to the rotation of the ring gear 48, As a result, the steel ball 30 is inserted into the engagement groove 27 via the inclined portion 27a or the inclined portion 27b. In other words, the driving force disconnection mechanism 31 is disconnected, and the ring gear 25 begins to rotate around the fixed shaft 2, which adversely affects the motor 33 and each gear. It is prevented from coming out. Also, according to such a structure, the mirror body 52 has a front or rear direction. Even when the mirror body 52 is forcibly tilted by applying force from the side, the motor 33 and each gear can be prevented from being overloaded.

[0024] By the way, in this embodiment, the engagement groove 27 of the ring gear 25 and the groove 23 of the fixed shaft 2 are made of steel. A driving force connection/disconnection mechanism 31 is constructed by engaging the balls 23, and such a structure According to the conventional method, a steel ball is engaged between a locking plate and a ring gear to drive the The locking plate can be eliminated compared to the one that constitutes the force connection/disconnection mechanism, and therefore this Accordingly, the vertical dimensions of the driving force connection/disconnection mechanism 31 can be shortened. Also, ring gear Since 25 does not move up or down, this movement space is no longer required, and in this respect Also, the vertical dimensions of the driving force connection/disconnection mechanism 31 can be shortened. Also, ring gear 25 Since no frictional force is generated between the fixed shaft 2 and the fixed shaft 2, the force required to connect and disconnect the driving force remains constant. be able to.

[0025] Furthermore, the meshing position of the ring gear 25 and the ring gear 48 is approximately at the same height as the steel ball 30. Therefore, it is possible to prevent the ring gear 25 from tilting when the driving force is connected or disconnected.

[0026]

[Effect of the idea]

As described above, according to the present invention, the steel balls are engaged when fixing the ring gear as in the conventional case. Eliminates the need for a mating engagement ring, making it possible to reduce the vertical dimensions of the driving force disconnection mechanism. can. Also, since the ring gear does not move up and down, it is possible to reduce its dimensions. In addition, since no frictional force is generated between the fixed shaft and the fixed shaft, the force required to connect and disconnect the driving force is unified. can be kept constant.

[Brief explanation of drawings]

[Figure 1] Longitudinal cross-sectional view of foldable door mirror

[Figure 2] Exploded diagram of main parts of foldable door mirror

[Figure 3] Front view of engagement groove

[Figure 4] Cross-sectional view taken along line 4-4 in Figure 3

[Figure 5] Longitudinal cross-sectional view of a conventional driving force disconnection mechanism

[Explanation of symbols]

1...Base member 2...Fixed axis 23...Second engagement groove 25...Ring gear 27...First engagement groove 27a, 27b...slanted part 30...Steel ball 31...Driving force connection/disconnection mechanism 48...Gear on the mirror body side

Claims (1)

[Scope of utility model registration request] 1. Consisting of a base member fixed to the vehicle body side, and a mirror body that supports the mirror and is rotatably attached to a fixed shaft provided on the base member, the mirror body is rotated by the power of a drive source. In a vehicle mirror configured to rotate a mirror body by rotating a provided gear around the fixed shaft, a driving force connection/disconnection mechanism is provided between the fixed shaft and the gear to connect/disconnect the power of the drive source. , this driving force connection/disconnection mechanism is provided with a ring gear provided on the outer periphery of the fixed shaft and meshing with the gear, a first engagement groove formed on the inner periphery of the ring gear, and a first engagement groove formed on the outer periphery of the fixed shaft. a second engagement groove, a ball member that engages across the first engagement groove and the second engagement groove, and locks the ring gear on the fixed shaft side by this engagement; and the ball member and a spring that presses the ball member downward, and the first engagement groove is configured such that when an overload is applied to the mirror body side, the ball member is moved into the first engagement against the pressing force of the spring. A driving force connection/disconnection mechanism for a vehicle mirror, characterized in that an inclined surface is formed to allow upward separation from a matching groove.