JP2012031902A - Shift switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift switching device that has a simple configuration for obtaining accurate shift positions, and can improve the durability of the components of an electric motor and a power transmission mechanism, etc.SOLUTION: The shift switching device includes: an electric motor 12, a shifting switching mechanism 14, and a power transmission mechanism 13. The shift switching mechanism 14 has: a detent turning plate 51 that has a recess and a projection corresponding to a shift position and is configured to turn; a detent spring 52 configured to be engaged with the recess for deciding a turning position for the detent turning plate 51. The power transmission mechanism 13 has: a large-diameter side gear 47 for receiving power from the electric motor 12; and an adjust lever 48 for receiving the power from the large-diameter side gear 47 and transmitting the power to the detent rotating plate 51. A first play portion is formed between the large-diameter side gear 47 and the adjustment lever 48 in order to avoid power transmission at a certain position to the detent rotating plate 51, and a second play portion is formed at the large-diameter side gear 47.

Description

  The present invention relates to a shift switching device including an electric motor driven according to a driver's shift operation, and more particularly to a shift switching device for a transmission mounted on a vehicle such as an automobile.

  Conventionally, as this type of shift switching device, an electric motor, a worm provided on the output shaft of the electric motor, a worm wheel that meshes with the worm, a control shaft that is arranged coaxially with the worm wheel, and a control shaft that is fixed It is known that includes a detent lever, a detent mechanism that determines the rotation position of the detent lever, and a range switching valve that is connected to the detent lever and switches the range position according to the rotation position of the detent lever (for example, Patent Document 1).

  In this conventional shift switching device, the control shaft is provided with a coupling portion that couples with the worm wheel, and this coupling portion is engaged with the boss portion that is the rotational axis of the worm wheel so that the end portion of the control shaft can be relatively rotated. It has a combined structure. In this coupling portion, a play portion having a predetermined play amount is provided between the boss portion and the control shaft, and both can rotate relative to each other within the range of the play amount.

The play amount is set to a dimension that allows the so-called detent lever to be self-propelled. That is, within the range of the play amount, the detent spring roller in the detent mechanism has a concave portion adjacent to the top of one convex portion of the concave portion and the convex portion formed on the detent lever at a position corresponding to the shift position. The self-propelled detent lever is allowed to engage with the trough portion only by the pressing force of the detent spring.
Within this play amount range, the power of the electric motor is not transmitted to the detent lever via the worm wheel and the control shaft.

  In this way, by providing a play part in the coupling part, the detent lever range position is accurately determined by the self-propelled function of the detent mechanism even if the detent lever does not stop at the target rotational position accurately due to the power of the motor. can do. As a result, the rotation control of the electric motor can be simplified, and the degree of freedom in selecting the type of electric motor is increased.

JP 05-118436 A

  However, in the conventional shift switching device as described above, even when the energization of the motor is stopped, the motor rotates and power is transmitted to the detent lever due to the inertia of the motor. In this way, when the power of the electric motor after the energization stops is applied to the detent lever with the start of the self-running of the detent lever described above, when the concave portion of the detent lever is engaged with the roller of the detent spring in the detent mechanism, the concave portion is a roller. Will come in contact with the momentum. That is, the transmission of the power of the electric motor precedes, and in addition to the self-running of the detent lever, the detent lever is rotated by the power of the electric motor. There was a possibility that an excessive load was applied.

  This contact causes an excessive load on the recess and the roller, and the electric motor locks, and an excessive torque is generated between the recess and the roller, so that peripheral components such as an electric motor, a reduction gear, and a worm wheel are There is a problem that damage may be caused by impact or excessive torque, and durability may be lowered.

  The present invention has been made to solve the conventional problems as described above, and can obtain an accurate shift position with a simple structure, and can also improve the durability of components such as an electric motor and a power transmission mechanism. It is an object to provide a shift switching device that can be improved.

  In order to solve the above problems, the shift switching device according to the present invention is (1) a shift that switches a shift position that includes an electric motor that outputs power in response to a shift operation, and a parking position and a non-parking position other than the parking position. In a shift switching device including a switching mechanism and a power transmission mechanism that transmits the power of the electric motor to the shift switching mechanism, the shift switching mechanism is formed between a recess corresponding to the shift position and the recess. A detent rotation plate that has a convex portion and rotates, and a detent spring that engages with the concave portion and determines the rotation position of the detent rotation plate, and the power transmission mechanism is a power of the electric motor. A first power transmission member that receives power from the first power transmission member, and the detent A second power transmission member that transmits power to the moving plate, and the first power transmission when the detent spring is in a predetermined rotation position that engages with the convex portion of the detent rotation plate. A first play portion where the power of the first power transmission member is not transmitted to the second power transmission member is formed between the member and the second power transmission member, and the first power A second play portion where the power of the electric motor is not transmitted is formed on the transmission member.

  With this configuration, even when the shift switching device is switched from the non-parking position to the parking position, after the motor is de-energized, even if the motor continues to rotate due to its inertia and the power is output, the power is the first Since the second play portion provided on the power transmission member of the first embodiment does not transmit to the first power transmission member, the impact action due to the excessive driving force generated by the contact between the detent spring and the concave portion of the detent rotation plate is avoided. Is done. That is, the power of the motor is transmitted to the detent rotation plate while the power is not transmitted to the first power transmission member by the second play portion provided on the first power transmission member. Since the detent rotation plate is rotated only by the pressing force of the detent spring, when the detent spring is engaged with the recess, the detent rotation plate is quickly engaged without applying an impact.

  In addition, even when the parking position is switched to the non-parking position, even if power is output after the motor is de-energized, the power is generated by the other second play portion provided in the first power transmission member. Since the power is not transmitted to the first power transmission member, an impact effect due to an excessive driving force caused by contact between the detent spring and the concave portion of the detent rotation plate is avoided. That is, the power of the electric motor is transmitted to the detent rotation plate while it is not transmitted to the first power transmission member by the other second play portion provided in the first power transmission member. Since the detent rotation plate is rotated only by the pressing force of the detent spring, when the detent spring is engaged with the recess, the detent rotation plate is quickly engaged without applying an impact.

  That is, in any shift switching operation, the shift switching device according to the present invention is not shocked when the switching is completed, and the shift can be switched quickly. Therefore, in the shift switching device according to the present invention, the durability of components such as the electric motor and the power transmission mechanism is improved with a simple structure in which the second play portion is formed on the first power transmission member. be able to.

  In addition, since the first play portion where power is not transmitted is formed between the first power transmission member and the second power transmission member, the detent rotation plate is within the range of the first play portion. It can be rotated only by the pressing force of the detent spring, and an accurate rotation position of the parking position and the non-parking position can be obtained, and an accurate shift position can be obtained. In other words, the detent spring can be accurately engaged with the recess serving as the parking position by the pressing force of the detent spring. Further, the detent spring can be accurately engaged with the recess that is in the non-parking position by the pressing force of the detent spring.

  In the shift switching device according to (1) above, (2) the power transmission mechanism includes a drive gear coupled to the output shaft of the electric motor, and the first power transmission member meshes with the drive gear. And the second play portion is constituted by a missing tooth portion from which predetermined teeth of the driven gear are removed.

  With this configuration, the power transmission mechanism has a drive gear connected to the output shaft of the electric motor, and the first power transmission member has a driven gear that is engaged with and driven by the drive gear. The power is reliably transmitted to the first power transmission member. In addition, since the second play portion is constituted by the toothless portion from which the predetermined tooth of the driven gear is omitted, the power output from the electric motor is within the range of the second play portion with a simple structure. Therefore, the transmission is reliably avoided, and the detent rotation plate can be rotated only by the pressing force of the detent spring prior to the power transmission of the electric motor. As a result, when the detent spring is engaged with the recess, the detent spring is quickly engaged without any impact. Therefore, in the shift switching device according to the present invention, the durability of the components such as the electric motor and the power transmission mechanism is simplified by simply forming the toothless portion as the second play portion on the first power transmission member. Can be improved.

  In the shift switching device according to (1) above, (3) the power transmission mechanism includes a drive wheel coupled to an output shaft of the electric motor, and the first power transmission member frictions the drive wheel. It has a driven wheel which contacts, and the 2nd play part is constituted by a small diameter part which has a radius smaller than a radius of the perimeter at a predetermined peripheral position of the driven wheel.

  With this configuration, the power transmission mechanism has drive wheels connected to the output shaft of the electric motor, and the first power transmission member has driven wheels that are engaged with and driven by the drive wheels. Power is transmitted to the first power transmission member by frictional contact. In addition, since the second play portion is configured by a small diameter portion having a radius smaller than the radius of the outer periphery at the outer peripheral position of the driven wheel, the power output from the electric motor can be obtained by the simple structure. The transmission is reliably avoided in the range of the play portion, and the detent rotation plate can be rotated only by the pressing force of the detent spring prior to the power transmission of the electric motor. As a result, when the detent spring is engaged with the recess, the detent spring is quickly engaged without any impact. Therefore, in the shift switching device according to the present invention, the durability of the components such as the electric motor and the power transmission mechanism is simplified by simply forming the toothless portion as the second play portion on the first power transmission member. Can be improved.

  In addition, since the first power transmission member has a small-diameter portion, when the power transmission mechanism is assembled, the first power transmission member can be easily assembled without applying an extra load to the driven wheels and the drive wheels. Can be assembled. That is, when the driven wheel is incorporated at a position where the driven wheel contacts the small diameter portion while maintaining a predetermined positional relationship between the driven wheel and other components such as the detent rotation plate, the driven wheel and the driven wheel are It can be assembled without being deformed, and can be assembled while maintaining an appropriate contact pressure. By assembling in this way, power is transmitted from the driving wheel to the driven wheel with an optimum frictional force.

  Further, in the shift switching device according to the above (1) to (3), (4) the first power transmission member has an engagement hole that engages with the second power transmission member, and a rotation shaft. The second power transmission member has an engagement projection inserted into the engagement hole and rotates together with the rotation shaft so as to rotate around the rotation shaft. An inner wall of the first power transmission member and the engagement protrusion connected to the rotation shaft and connected to the detent rotation plate so as to rotate together with the detent rotation plate. Is engaged, power is transmitted from the first power transmission member to the second power transmission member, and the first play portion is defined between the engagement protrusion and the inner wall. It is characterized by comprising a gap.

  With this configuration, the first play portion is a gap defined between the engagement protrusion formed on the second power transmission member and the inner wall surrounding the engagement hole formed on the first power transmission member. Therefore, transmission of power from the first power transmission member to the second power transmission member is more reliably avoided at the first play portion. Therefore, in the range of the first play portion, the detent rotation plate can be rotated only by the pressing force of the detent spring, and an accurate rotation position of the parking position and the non-parking position can be obtained and an accurate shift can be achieved. You can get a position. In other words, the detent spring can be accurately engaged with the recess serving as the parking position by the pressing force of the detent spring. Further, the detent spring can be accurately engaged with the recess that is in the non-parking position by the pressing force of the detent spring.

  According to the present invention, it is possible to provide a shift switching device capable of obtaining an accurate shift position with a simple structure and improving the durability of components such as an electric motor and a power transmission mechanism.

1 is a perspective view of a front portion of a vehicle showing a transaxle and an engine equipped with a shift switching device according to a first embodiment of the present invention. 1 is an exploded perspective view of a shift switching device according to a first embodiment of the present invention. It is a top view in the state where the cover of the shift switching device concerning a 1st embodiment of the present invention was removed. It is a side view showing a part of shift shift device concerning a 1st embodiment of the present invention. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention. It is a top view of the small diameter side gear of the shift switching apparatus which concerns on 1st Embodiment of this invention. It is a top view of the large diameter side gear of the shift switching device concerning a 1st embodiment of the present invention. FIG. 3 is a plan view of an adjustment lever of the shift switching device according to the first embodiment of the present invention. It is a top view of the detent rotation plate of the shift switching device concerning a 1st embodiment of the present invention. It is the enlarged plan view which expanded a part of detent rotation plate of the shift switching apparatus which concerns on 1st Embodiment of this invention. It is an operation | movement chart which shows the state of operation | movement of the shift switching apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) shows the non-parking lock state of a shift switching apparatus, (b) is cancellation | release of a non-parking locking state. Indicates the started state. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) shows the state which the adjustment lever of the shift switching apparatus separated from limit switch SW1, (b) is a detent. The state which has the roller part of a spring in front of the top part of a detent rotation plate is shown. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) shows the state which has the roller part of the detent spring of a shift switching apparatus immediately after the top part of a detent rotation plate. , (B) shows a state in which the roller portion of the detent spring has started self-propelled. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) shows the state in which the roller part of the detent spring of a shift switching apparatus is in the middle of self-propelled, (b) Indicates a state in which the power transmission of the small-diameter side gear is cut. It is a top view which shows a part of shift switching device concerning a 1st embodiment of the present invention, (a) shows the state where shift switching device is in a parking lock, and (b) shows the release of parking lock. Indicates the state that has been performed. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) shows the state which the adjustment lever of the shift switching apparatus separated from limit switch SW2, (b) is a detent. The state which has the roller part of a spring in front of the top part of a detent rotation plate is shown. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) shows the state which has the roller part of the detent spring of a shift switching apparatus immediately after the top part of a detent rotation plate. (B) shows a state where the roller part of the detent spring is in the middle of self-running. It is a top view which shows a part of shift switching apparatus which concerns on 1st Embodiment of this invention, (a) is the roller part of the detent spring of a shift switching apparatus in the middle of self-propelled, and power transmission of a small diameter side gear is The cut state is shown, and (b) shows the parking lock state of the shift switching device. It is a disassembled perspective view of the shift switching apparatus which concerns on 2nd Embodiment of this invention. It is a top view in the state where the cover of the shift switching device concerning a 2nd embodiment of the present invention was removed. It is a side view which shows a part of shift switching apparatus which concerns on 2nd Embodiment of this invention. It is a top view which shows a part of shift switching apparatus which concerns on 2nd Embodiment of this invention. It is a top view of the small diameter side gear of the shift switching apparatus which concerns on 2nd Embodiment of this invention. It is a top view of the large diameter side gear of the shift switching device concerning a 2nd embodiment of the present invention. It is a perspective view which shows a part of automatic transmission with which the shift switching apparatus which concerns on 3rd Embodiment of this invention is applied.

  Hereinafter, a first to third embodiments of a shift switching device according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 thru | or FIG. 19 (a), (b) is a figure which shows the shift switching apparatus 10 which concerns on 1st Embodiment of this invention.
As shown in FIG. 1, the shift switching device 10 is provided in a transaxle 3 connected to the engine 2 of the vehicle 1, and rotates the output shaft of the vehicle 1 in accordance with the shift operation of the driver of the vehicle 1. It is connected to a parking lock mechanism 20 that locks and unlocks.

  The shift switching device 10 constitutes a so-called shift-by-wire shift control system that detects a driver's shift operation input by a sensor or switch and selects a shift position according to the detection signal. And a shift position composed of a non-parking position other than the parking position.

  In this shift switching device 10, when the parking switch 4 provided in the driver's seat of the vehicle 1 is operated and turned ON, the shift position is switched to the parking position, the output shaft is locked by the parking lock mechanism 20 of the vehicle 1, and the vehicle 1. The stop state is maintained. Further, when the parking switch 4 is released, the parking switch 4 is switched to the non-parking position, the output shaft is unlocked by the parking lock mechanism 20 of the vehicle 1, and the vehicle 1 is allowed to travel.

  In the shift switching device according to the present invention, the shift operation may be performed by a structure other than the structure in which the driver's shift operation input operates the parking switch. For example, when the driver slides the shift lever provided in the driver's seat of the vehicle 1 to the parking range, the shift operation is performed with a structure in which the output shaft is locked by the parking lock mechanism based on the selected parking range. It may be made.

A configuration of the shift switching device 10 according to the first embodiment will be described.
As shown in FIGS. 2 and 3, the shift switching device 10 controls the case 11, the electric motor 12, the power transmission mechanism 13, the shift switching mechanism 14, the limit switches SW1 and SW2, and the electric motor 12 (not shown). An electronic control unit (ECU: Electronic Control Unit) and a fixing screw 15 for fixing the electric motor 12 to the case 11 are configured.

  The electronic control unit includes a CPU (Central Processing Unit), a ROM that stores processing programs, a RAM that temporarily stores data, an EEPROM that includes an electrically rewritable nonvolatile memory, an A An input port including an / D converter and a buffer, and an output port are included.

  The case 11 includes a case main body 21, a support plate 22 that supports the power transmission mechanism 13, a substrate 23, a cover 24, a fixing screw 25 that fixes the support plate 22 to the case main body 21, and a substrate 23 on the support plate 22. And a fixing screw 26 for fixing the screw.

  The case body 21 is formed in a box shape with one end open, and includes a support wall 31 that supports the electric motor 12 and the power transmission mechanism 13, and side walls 32, 33, 34, 35 that protrude perpendicularly from the edge of the support wall 31. 36, a mounting portion 37A provided in the side wall 32 and having a through hole 37a, a mounting portion 37B provided in the side wall 34 and having a through hole 37b, and a mounting portion provided in a corner of the side wall 35 and the side wall 36 and having a through hole 37c. It includes a portion 37 </ b> C and a connection portion 39 provided between the side wall 33 and the side wall 34.

Mounting bolts (not shown) are inserted into the through holes 37 a and 38 a so that the case main body 21 is attached to the transaxle 3 of the vehicle 1.
The case body 21 includes a stud 21 a provided at a joint between the side wall 32 and the side wall 33, a stud 21 b provided at a joint between the side wall 33 and the side wall 34, and a joint between the side wall 34 and the side wall 35. And a stud 21d provided at a joint portion between the side wall 36 and the side wall 32.

The support wall 31 includes support portions 31a, 31b, and 31c, mounting bosses 31d, 31e, and 31f, and switch mounting portions 31g and 31h.
The electric motor 12 is fixed to the support portion 31 a by the fixing screw 15 and is supported by the support wall 31.

  Further, the power transmission mechanism 13 is supported by the support portions 31b and 31c. A fixing screw 25 is screwed to each of the mounting bosses 31d, 31e, 31f, and the support plate 22 is fixed to the mounting bosses 31d, 31e, 31f by this fixing screw 25. Yes.

  The connection unit 39 is configured to accommodate a connector having a connection terminal (not shown) and the like, and lead wires such as the electric motor 12 and limit switches SW1 and SW2 are connected via the connector.

  The support plate 22 has a support portion 22a, is fixed to the case main body 21, and supports one end of the power transmission mechanism 13 by the support portion 22a.

The board 23 is made of a printed wiring board on which a conductor wiring pattern is formed, and is mounted between the support plate 22 and the cover 24, and an electronic control unit (ECU) (not shown) is mounted on the electric motor. 12, it functions as a connection circuit for electronic components such as limit switches SW1 and SW2.
In the shift switching device according to the present invention, a connection circuit for electronic components such as the electric motor 12 and the limit switches SW1 and SW2 may be configured by a wiring member such as a lead wire instead of the substrate 23.

  The cover 24 is formed in a box shape with one end opened, and mounting portions 24a are provided at the respective corners. The studs 21a, 21b, 21c, and 21d of the case main body 21 are inserted into the mounting portions 24a, respectively. Is fixed to the case main body 21.

The electric motor 12 is configured by a motor such as a DC brush motor, an SR motor (Switched Reluctance Motor), and the like, and outputs power from the output shaft 12a when energized.
You may make it comprise the motor 12 with what has another structure. For example, a reduction mechanism such as a cycloid reduction gear having an eccentric plate, an external gear, and an internal gear inside may be provided.

  The power transmission mechanism 13 includes a small-diameter side helical gear 41, a large-diameter side helical gear 42, a rotating shaft 43, bearings 44 and 45, a rotating shaft 46, and a large-diameter side gear 47 serving as a first power transmitting member. An adjustment lever 48 as a second power transmission member and a mounting ring 49 are included.

  The small-diameter side helical gear 41 is fixed to the output shaft 12a of the electric motor 12, and the power output from the output shaft 12a is transmitted to the large-diameter side helical gear 42.

  The large-diameter side helical gear 42 has a gear 42 a and a small-diameter side gear 42 b as a drive gear formed integrally with the gear 42 a, and is engaged with the small-diameter side helical gear 41 and transmitted from the small-diameter side helical gear 41. Is greatly decelerated and transmitted to the large diameter gear 47 via the small diameter gear 42b.

  As shown in FIGS. 4 to 6, the small-diameter side gear 42 b is constituted by a spur gear having 13 teeth of n1 to n13 and meshes with the large-diameter side gear 47.

  The rotating shaft 43 is inserted into the large-diameter side helical gear 42 and is configured to rotate together with the large-diameter side helical gear 42. The rotating shaft 43 is attached to the bearing 44 attached to the support portion 31 b of the case body 21 and the support portion 22 a of the support plate 22. The bearing 45 is supported rotatably.

  The rotating shaft 46 includes a connecting portion 46a connected to the shift switching mechanism 14, a support portion 46b that rotatably supports the large-diameter side gear 47, and an adjusting lever 48 between the connecting portion 46a and the supporting portion 46b. And a connecting part 46c that is spline-coupled, and a rotating part 46d that is supported by the support part 31c of the case body 21 and rotates between the connecting part 46c and the connecting part 46a.

  As shown in FIGS. 5 and 7, the large-diameter side gear 47 is formed with a through hole 47a into which the support portion 46b of the rotation shaft 46 is inserted, and a rotation portion that rotates around the support portion 46b. It has a support portion 47b, a spur tooth portion 47c as a driven gear formed in a fan shape, and an engagement hole 47d formed through the spur tooth portion 47c.

  Flat teeth 47c are teeth a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, formed on the arc-shaped outer periphery. Of the 19 flat teeth of r and s, it has a missing tooth portion 47e with the e-tooth cut and a missing tooth portion 47o with the o-tooth cut. The spur tooth portion 47c and the small diameter side gear 42b are engaged with each other.

  The missing tooth portion 47e and the missing tooth portion 47o of the large-diameter gear 47 constitute a second play portion in the shift switching device according to the present invention.

  As shown in FIGS. 4 and 8, the adjustment lever 48 includes a coupling portion 48 b in which a spline coupling hole 48 a is formed so as to be spline coupled with the coupling portion 46 c of the rotating shaft 46, and an engagement hole of the large-diameter side gear 47. An engaging projection 48c inserted into 47d and a pair of projecting portions 48d and 48e formed so as to project in a direction perpendicular to a line connecting the centers of the coupling portion 46c and its opposite end.

When the engaging protrusion 48c of the adjusting lever 48 is inserted into the engaging hole 47d of the large-diameter side gear 47, there is a gap between the engaging protrusion 48c and the inner wall 47n of the large-diameter side gear 47 surrounding the engaging hole 47d. S ₁ and S ₂ are formed, and the gaps S ₁ and S ₂ constitute a first play portion in the shift switching device according to the present invention.

  When the adjusting lever 48 rotates together with the rotating shaft 46, the projecting portions 48d and 48e engage with the limit switches SW1 and SW2, respectively. Further, when the adjusting lever 48 is rotated together with the rotating shaft 46, the engaging protrusion 48c and the inner wall 47n surrounding the engaging hole 47d of the large-diameter side gear 47 are engaged, and after the engagement, the adjusting lever 48 is engaged. And the large-diameter side gear 47 are rotated together.

  The adjusting lever 48 constitutes a second power transmission member in the shift switching device according to the present invention.

  As shown in FIGS. 2 and 3, the mounting ring 49 is mounted on the support portion 46 b of the rotating shaft 46 and restricts the large-diameter side gear 47 from coming out of the rotating shaft 46.

  The shift switching mechanism 14 includes a detent rotation plate 51, a detent spring 52, a spring retainer 53, and a mounting bolt 54 that attaches the detent spring 52 and the spring retainer 53 to the transaxle 3.

  As shown in FIGS. 4, 5, 9, and 10, the detent rotation plate 51 includes a connection portion 51 a that is connected to the connection portion 46 a of the rotation shaft 46 and an engagement portion 51 b that is engaged with the detent spring 52. And a coupling portion 51c coupled to the parking lock mechanism 20.

The connecting portion 51a is formed with a connecting hole 51e having a notch 51d into which a protrusion formed on the connecting portion 46a of the rotating shaft 46 is inserted, and the connecting portion 46a of the rotating shaft 46 is inserted into the connecting shaft 51a. It is connected to 46 so that it cannot rotate relative to it.
When engaged with the detent spring 52, the engaging portion 51b has a concave portion 51f that becomes a non-parking position, a concave portion 51g that becomes a parking position, and a convex portion 51h that is formed between the concave portion 51f and the concave portion 51g. ing.

Recess 51f has a recess having a radius _{r 1} semicircular, similar to the recess 51f also recesses 51 g, and has a recess having a radius _{r 1} semicircular.
Protrusions 51h, the curvature radius of the top portion 51t is formed in _{r 2,} the convex curve Cf connecting the top 51t and the recess 51f, and a convex curve Cg connecting the top 51t and the concave portion 51g Have.

  The connecting portion 51c is integrally formed by bending with respect to the connecting portion 51a, and has a through hole 51k having a notch.

  As shown in FIGS. 2 to 4, the detent spring 52 has a main body 52a, a mounting portion 52b, and a roller portion 52c. The roller portion 52c is engaged with the concave portions 51f and 51g of the detent rotation plate 51. When combined, the roller portion 52c and the concave portions 51f and 51g are engaged with each other with a predetermined contact pressing force (N).

The main body 52a is formed of a leaf spring made of an elastic material, and one end thereof is integrally formed with the attachment portion 52b and the other end thereof with the roller portion 52c.
A through hole is formed in the attachment portion 52b, and the attachment bolt 54 is inserted therethrough.
The roller portion 52c includes a roller 52r, a support shaft 52s that rotatably supports the roller 52r, and a support portion 52u that supports both ends of the support shaft 52s.

The spring retainer 53 fixes the attachment portion 52b of the detent spring 52 to the transaxle 3 and restricts the main body 52a from being excessively deformed when the main body 52a of the detent spring 52 is elastically deformed.
With this configuration, when the detent rotation plate 51 rotates together with the rotation shaft 46, the roller 52r of the detent spring 52 has a predetermined pressing force on the contact surfaces of the convex portions 51h and the concave portions 51f and 51g of the detent rotation plate 51. And the roller 52r can move smoothly while rotating on the contact surface.

As shown in FIG. 2, the limit switch SW1 is a limit switch provided with a hinge lever. When this hinge lever is pressed by a predetermined stroke, it is turned on and a detection signal is output, and it is turned off when the pressure is released.
The limit switch SW1 is attached to the switch attachment portion 31g of the case body 21, and is turned on when the adjustment lever 48 rotates together with the rotation shaft 46 and the projection 48d presses the hinge lever, and the shift switching mechanism. 14 is detected to be in the parking lock state.

  The limit switch SW2 is configured in the same manner as the limit switch SW1 and is attached to the switch attachment portion 31h of the case body 21. The adjustment lever 48 rotates together with the rotation shaft 46, and the protrusion 48e presses the hinge lever. At this time, the shift switching mechanism 14 is detected to be in a non-parking lock state.

  Note that these limit switches SW1 and SW2 may be configured by switches other than the limit switch having a hinge lever. For example, it may be a push-type limit switch or a non-contact type position detection switch that electrically detects the position of the object to be detected.

  As shown in FIGS. 2 and 3, the parking lock mechanism 20 includes a parking rod 61, a parking cam 62, a cam spring 63, a parking pole 64, and a parking gear 65.

  The parking rod 61 is made of a rod-shaped member, and is bent so as to be orthogonal to the axial direction of the parking rod 61. The parking rod 61 is connected to the connecting portion 51c of the detent rotation plate 51 and moved to the transaxle 3 in the axial direction. It has a support end portion 61 b that can be supported and a spring support portion 61 c that supports the cam spring 63.

The connecting end portion 61a has an engaging pin (not shown) press-fitted so as to be engaged with a notch of the through hole 51k having a notch of the connecting portion 51c of the detent rotation plate 51, and through this engaging pin. It is non-rotatably connected to the connecting portion 51c.
The spring support portion 61 c is formed so as to protrude perpendicular to the axial direction of the parking rod 61 between the connection end portion 61 a and the support end portion 61 b and supports the end portion of the cam spring 63.

  The parking cam 62 has an inclined engagement surface that engages with the parking pole 64 and is formed in a truncated cone shape. The parking cam 62 has a through-hole penetrating in the axial direction, and a parking rod 61 is inserted into the through-hole, and is attached to the parking rod 61 so as to be movable in the axial direction.

  The cam spring 63 is composed of a compression coil spring and is attached to the parking rod 61. One end is supported by the spring support 61c of the parking rod 61 and the other end presses the parking cam 62 toward the support end 61b of the parking rod 61. is doing.

The parking pole 64 has a cam engaging portion 64 a that engages with the parking cam 62, a support portion 64 b that is rotatably supported by the transaxle 3, and a meshing portion 64 c that meshes with the parking gear 65.
When the detent rotation plate 51 rotates and the parking rod 61 moves to the support end 61b side, the parking pole 64 is pressed by the parking cam 62 and rotates around the support 64b to mesh. The portion 64c is engaged with the parking gear 65.

The parking gear 65 includes a gear 65a that is provided integrally with a gear mechanism that constitutes the transaxle 3 and is connected to an output shaft from which the power of the engine 2 is output.
The gear 65a has a plurality of concave portions 65b formed at equal intervals on the circumference so as to mesh with the meshing portion 64c of the parking pole 64, and a plurality of convex portions 65c formed between the concave portions 65b.

Next, the switching operation of the shift switching device 10 in the first embodiment will be described.
The state diagram shown in the upper part of FIG. 11 is a reduced scale display of FIGS. 12 (a), 12 (b) to 16 (a), (b), and shows the state of operation of the shift switching device 10. Yes. In addition, the filled horizontal frame in the lower row shows the operating state of the components described in the left frame, the horizontal axis direction indicates the passage of time, and the vertical axis direction indicates the energized state and the operating state. Yes.

  In FIG. 11, the detent rotation plate 51 of the shift switching device 10 shown in FIG. 12A is moved from the rotation position of the non-parking position to the detent rotation plate 51 of the shift switching device 10 shown in FIG. The operation until the rotation position of the parking position is reached is shown. In contrast to the operation shown in FIG. 11, the rotation direction of the detent rotation plate 51 of the shift switching device 10 is reversed from the rotation position of the parking position to the rotation position of the non-parking position. The operation is almost the same as that shown in FIG.

  FIG. 11 and FIG. 12A are driving states in which the vehicle 1 is traveling or idling, the parking switch 4 is released, and the shift switching device 10 is determined as the rotation position of the non-parking position. It shows that it is in a state.

In this non-parking lock state, the first play portions of the gaps S ₁ and S ₂ are between the engaging protrusion 48c of the adjusting lever 48 and the inner wall 47n of the large-diameter side gear 47 surrounding the engaging hole 47d. It is defined. Within the range of the first play portion, the power of the electric motor 12 is not transmitted to the adjusting lever 48, and the adjusting lever 48 is disconnected from the electric motor 12 and rotated only by the pressing force due to the elastic deformation of the detent spring 52. Thus, the rotational position of the non-parking position is determined with high accuracy.

When the vehicle 1 is stopped and the parking switch 4 shown in FIG. 1 is pushed by the driver, the electronic control unit energizes the motor 12, and when the motor 12 is operated, the output shaft 12 a rotates and the power transmission mechanism 13 has a small diameter. The large-diameter side gear 47 starts to rotate via the side helical gear 41.
At this time, as shown in the lower part of FIG. 11, a relatively small load is applied to the electric motor 12 so as to rotate the large-diameter side gear 47. The limit switch SW2 is in the ON state, the limit switch SW1 is in the OFF state, and it is detected that the shift switching device 10 is in the non-parking lock state.

Subsequently, as shown in FIGS. 11 and 12B, the large-diameter gear 47 starts to rotate in the direction indicated by the arrow, and surrounds the engaging protrusion 48c and the engaging hole 47d of the adjusting lever 48. When the inner wall 47n side gear 47 are in contact, i.e., if a gap S ₂ becomes zero, by being pushed by the large-diameter gear 47, the adjustment lever 48 starts to rotate in the same direction as the large diameter side gear 47.
Subsequently, after the adjustment lever 48 starts to rotate, the detent rotation plate 51 starts to rotate with a slight time lag. Since there is a slight clearance at the connecting portion between the detent rotation plate 51 and the rotation shaft 46, a slight time lag occurs.

  When the detent rotation plate 51 starts to rotate, the detent rotation plate 51 starts to slide in the direction in which the roller 52r is pushed up by the convex portion 51h against the pressing force of the main body 52a of the detent spring 52. Therefore, the load applied to the electric motor 12 is maximized. At this time, the limit switch SW2 is in the ON state, the limit switch SW1 is in the OFF state, and it is detected that the shift switching device 10 is still in the non-parking lock state.

  Subsequently, as shown in FIGS. 11 and 13A, the adjustment lever 48 is in a state where the engagement protrusion 48c of the adjustment lever 48 and the inner wall 47n of the large-diameter gear 47 surrounding the engagement hole 47d are in contact with each other. The detent rotation plate 51 is pushed by the large diameter side gear 47 and rotates in the same direction as the large diameter side gear 47, and the detent rotation plate 51 gradually pushes up the roller 52r of the detent spring 52 by the convex portion 51h. At this time, the limit switch SW2 is in the ON state, the limit switch SW1 is in the OFF state, and it is detected that the shift switching device 10 is still in the non-parking lock state.

Subsequently, as shown in FIGS. 11 and 13B, the adjustment lever 48 is pushed by the large-diameter side gear 47 and further rotated in the same direction as the large-diameter side gear 47, and the detent rotation plate 51. However, the roller 52r of the detent spring 52 is gradually pushed up by the convex portion 51h.
As the contact position between the convex portion 51h of the detent rotation plate 51 and the roller 52r approaches the top portion 51t of the convex portion 51h, the slope of the curve Cf shown in FIG. 10 becomes gentler, so the load applied to the motor 12 decreases. .

  At this time, the limit switch SW2 is separated from the adjusting lever 48 and is in the OFF state, and the limit switch SW1 is also in the OFF state, so that the shift switching device 10 is in the middle of switching from the non-parking position to the parking position. It has been detected that

  Subsequently, as shown in FIGS. 11 and 14A, the adjustment lever 48 is pushed by the large-diameter side gear 47 and further rotated in the same direction as the large-diameter side gear 47, and the detent rotation plate 51. The contact position between the convex portion 51h and the roller 52r reaches the top portion 51t of the convex portion 51h and passes therethrough. The load applied to the convex portion 51h of the detent rotation plate 51 and the electric motor 12 is further reduced.

  At this time, the limit switch SW2 is separated from the adjusting lever 48 and is in the OFF state, and the limit switch SW1 is also in the OFF state, so that the shift switching device 10 is in the middle of switching from the non-parking position to the parking position. It has been detected that

Subsequently, as shown in FIGS. 11 and 14B, the adjustment lever 48 is pushed by the large-diameter side gear 47 and further rotated in the same direction as the large-diameter side gear 47, and the detent rotation plate 51. The contact position between the convex portion 51h and the roller 52r moves to the downward inclined portion of the convex portion 51h.
At this time, the roller 52r is pressed in the direction of the recess 51g of the detent rotation plate 51 by the main body 52a of the detent spring 52. That is, the roller 52r is sucked in the direction of the concave portion 51g, and the load applied to the convex portion 51h of the detent rotation plate 51 and the electric motor 12 is minimized.

  At this time, the limit switch SW2 is maintained in the OFF state separated from the adjustment lever 48, and the limit switch SW1 is also in the OFF state, so that the shift switching device 10 is in the middle of switching from the non-parking position to the parking position. It has been detected that

  11 and 15A, the adjustment lever 48 is subsequently pushed by the large-diameter side gear 47 and further rotated in the same direction as the large-diameter side gear 47, and the convex portion of the detent rotation plate 51 is shown. The contact position of 51h and the roller 52r has shown the state which moved to the inclination part of the convex part 51h.

  At this time, the roller 52r is pressed in the direction of the recess 51g of the detent rotation plate 51 by the main body 52a of the detent spring 52 and sucked in the direction of the recess 51g. The 3n teeth of the small diameter side gear 42 b are engaged with each other, and the power of the electric motor 12 is transmitted to the detent rotation plate 51.

That is, the roller 52r is in a state where the slope of the curve Cg shown in FIG. 10 is lowered by the power of the electric motor 12 and the elastic force of the main body 52a of the detent spring 52.
At this time, the limit switch SW1 is pushed by the protrusion 48d of the adjusting lever 48 and is turned on, and the limit switch SW2 is still in the off state, so that the shift switching device 10 is switched from the non-parking position to the parking position. It is detected. Based on this detection, energization of the motor 12 is stopped by the electronic control unit.

11 and 15 (b) show that, even after the energization of the motor 12 is stopped, the motor 12 continues to rotate due to its inertia, and power by the inertia force is output from the output shaft 12a. Since no power is transmitted to the large-diameter side gear 47 due to the toothless portion 47 o formed in 47, the detent rotation plate 51 precedes the large-diameter side gear 47 and a gap S ₂ ′ is generated. Indicates the state.

  At this time, rotation of the detent rotation plate 51 by the power of the electric motor 12 is avoided. As a result, the roller 52r of the detent spring 52 slides on the curve Cg toward the recess 51g of the detent rotation plate 51 only by its elastic force.

That is, the detent rotation plate 51 is sucked until the roller 52r of the detent spring 52 is placed in the rotation position of the recess 51g, and is in a so-called self-running state. Prior to the gear 47, a clearance S ₂ ′ is secured. At this time, the limit switch SW2 is maintained in the OFF state separated from the adjusting lever 48, and the limit switch SW1 is in the ON state, so that it is detected that the shift switching device 10 is switched from the non-parking position to the parking position. Has been.

  11 and 16 (a) show that after the energization of the electric motor 12 is stopped, the transmission of the power output from the output shaft 12a of the electric motor 12 is avoided due to its inertia, and the detent spring precedes the transmission of the electric power of the electric motor 12. 52 shows that the roller 52r 52 slides on the curve Cg toward the recess 51g of the detent rotation plate 51 only by its elastic force, and the roller 52r is engaged with the recess 51g.

Immediately before the roller 52r is engaged with the recess 51g, the p teeth of the large diameter gear 47 and the five teeth of the small diameter gear 42b are engaged, and the power of the electric motor 12 is transmitted to the large diameter gear 47 again. Power is not transmitted to the detent rotation plate 51 by the gap S ₂ ′. Therefore, the roller 52r is pressed and engaged with the recess 51g only by the elastic force of the main body 52a of the detent spring 52. By this engagement, the rotation of the detent rotation plate 51 is stopped.
At this time, the limit switch SW2 is maintained in the OFF state separated from the adjustment lever 48, and the limit switch SW1 is in the ON state, so that it is detected that the shift switching device 10 is in the parking lock state. .

Then, after the rotation of the detent rotation plate 51 is stopped, the rotation due to the inertia of the electric motor 12 is stopped, and the large-diameter side gear 47 is stopped in a state where the clearance S _{2 ″} (<S ₂ ′) is left. Show.
In FIG. 11 and FIG. 16B, the load applied to the electric motor 12 becomes no-load due to the stop of the rotation of the electric motor 12, and the shift switching from the non-parking position to the parking position is performed in the shift switching device 10. The state is shown, and the shift switching operation is completed.

  At this time, the limit switch SW2 is maintained in the OFF state separated from the adjustment lever 48, and the limit switch SW1 is in the ON state, so that it is detected that the shift switching device 10 is in the parking lock state. .

  Thus, when the detent rotation plate 51 switches from the non-parking position where the recess 51f and the roller 52r are engaged to the parking position where the recess 51g and the roller 52r are engaged, the detent rotation plate 51 rotates around the rotation shaft 46. Move. By this rotation, the parking rod 61 shown in FIGS. 2 and 3 moves to the parking pole 64 side, and the parking cam 62 presses the cam engaging portion 64 a of the parking pole 64.

  At this time, the parking pole 64 rotates around the support end 61b, and the meshing portion 64c of the parking pole 64 engages with the recess 65b of the parking gear 65. By this engagement, the parking lock mechanism 20 is locked, the rotation of the output shaft of the vehicle 1 is locked, and the rotation of the wheels is prevented.

  Next, the shift switching operation from the parking position to the non-parking position will be described with reference to FIGS. 17 (a), (b) to FIG.

FIG. 17A shows a state where the shift switching device 10 is in the parking lock state shown in FIG. 16B and the parking switch 4 shown in FIG. 1 is released by the driver.
In this state, the motor 12 is energized by the electronic control unit, the motor 12 is operated, the output shaft 12a rotates, and the large-diameter gear 47 rotates in the direction of the arrow via the small-diameter helical gear 41 of the power transmission mechanism 13. To do. When the engaging projection 48c of the inner walls 47n and the adjustment lever 48 of the large diameter side gear 47 surrounding the engaging hole 47d is in contact, i.e., a gap _{S 1} is zero, the adjustment lever 48 to the large diameter side gear 47 It is pushed and starts to rotate in the same direction as the large diameter side gear 47.

  At this time, the roller 52r of the detent spring 52 is pushed up against the pressing force of the main body 52a by a curve Cg of 51h shown in FIG. 10 of the detent rotation plate 51. Subsequently, the limit switch SW1 is separated from the adjustment lever 48 and is turned OFF, and it is detected that the parking lock state of the shift switching device 10 has been released.

  Subsequently, as shown in FIG. 17B, the adjustment lever 48 has a large diameter in a state where the engagement protrusion 48c of the adjustment lever 48 and the inner wall 47n of the large diameter side gear 47 surrounding the engagement hole 47d are in contact with each other. The detent rotation plate 51 is pushed by the side gear 47 and rotates in the same direction as the large-diameter side gear 47, and the detent rotation plate 51 further pushes up the roller 52r of the detent spring 52 by the convex portion 51h. At this time, the limit switches SW1 and SW2 are in the OFF state, and it is detected that the shift switching device 10 is in the non-parking lock state.

  Subsequently, as shown in FIGS. 11 and 18A, the adjustment lever 48 is pushed by the large-diameter side gear 47 and further rotated in the same direction as the large-diameter side gear 47, and the detent rotation plate 51. However, when the contact position between the convex portion 51h and the roller 52r exceeds the top portion 51t of the convex portion 51h, the load applied to the electric motor 12 decreases, and the roller 52r of the detent spring 52 moves toward the concave portion 51f of the detent rotation plate 51. And descend.

  Subsequently, as shown in FIG. 18B, the adjustment lever 48 is pushed by the large-diameter side gear 47 and further rotated in the same direction as the large-diameter side gear 47, and the convex portion of the detent rotation plate 51. The contact position between 51h and the roller 52r moves to the inclined portion indicated by the downward curve Cf of the convex portion 51h.

  At this time, the roller 52r is pressed in the direction of the recess 51g of the detent rotation plate 51 by the main body 52a of the detent spring 52. That is, the roller 52r is sucked in the direction of the recess 51g. The teeth 6n of the small-diameter side gear 42b and the teeth f of the large-diameter side gear 47 mesh with each other, and the load applied to the convex portion 51h of the detent rotation plate 51 and the electric motor 12 is minimized.

  At this time, the limit switch SW2 is maintained in the OFF state separated from the adjustment lever 48, and the limit switch SW1 is also in the OFF state, so that the shift switching device 10 is in the middle of switching from the non-parking position to the parking position. It has been detected that

FIG. 19A shows that, even after the energization of the electric motor 12 is stopped, the electric motor 12 continues to rotate due to its inertia, and the power due to the inertial force is output from the output shaft 12a. Since no power is transmitted to the large-diameter side gear 47 due to the missing tooth portion 47e, the detent rotation plate 51 is shown in a state where a clearance S ₁ ′ is generated ahead of the large-diameter side gear 47.

  At this time, rotation of the detent rotation plate 51 by the power of the electric motor 12 is avoided. As a result, prior to the power transmission of the electric motor 12, the roller 52r of the detent spring 52 slides on the curve Cf toward the recess 51f of the detent rotation plate 51 only by its elastic force.

That is, the detent rotation plate 51 is sucked until the roller 52r of the detent spring 52 is placed in the rotation position of the recess 51g, and is in a so-called self-running state. Prior to the gear 47, a clearance S ₁ ′ is secured. At this time, the adjustment lever 48 kicks the limit switch SW2 and becomes ON, and it is detected that the shift switching device 10 has been switched from the parking position to the non-parking position.

FIG. 19B shows a state where the roller 52r of the detent spring 52 is engaged with the detent rotation plate 51 while being pressed against the recess 51f of the detent rotation plate 51, and the rotation of the detent rotation plate 51 is stopped. After stopping the rotation of the detent rotation plate 51, it is rotated due to the inertia of the electric motor 12 stops, S _1'' larger diameter gear 47 while leaving the (<S 1 _') is stopped.

By stopping the rotation of the electric motor 12, the load applied to the electric motor 12 becomes a no-load state, and the shift switching operation from the parking position to the non-parking position in the shift switching device 10 is completed.
At this time, since the limit switch SW2 is maintained in the ON state pressed by the adjustment lever 48, it is detected that the shift switching device 10 is in the non-parking lock state.

  When the shift switching device 10 completes the shift switching operation from the parking position to the non-parking position, the parking lock mechanism 20 is unlocked, the rotation of the output shaft of the vehicle 1 is unlocked, and the rotation of the wheels is prevented. The wheel is released and the wheel can rotate.

  Since the shift switching device 10 according to the first embodiment is configured as described above, the following effects are obtained.

  That is, the shift switching device 10 includes an electric motor 12 that outputs power in response to a shift operation, a shift switching mechanism 14 that switches a shift position that includes a parking position and a non-parking position, and the power of the electric motor 12 that is used for the shift switching mechanism 14. And a power transmission mechanism 13 for transmitting to the vehicle.

  The shift switching mechanism 14 is engaged with the detent rotation plate 51 having the concave portions 51f and 51g and the convex portion 51h corresponding to the shift position, and the concave portions 51f and 51g. And a detent spring 52 for determining a moving position.

The power transmission mechanism 13 further includes a large-diameter side gear 47 that receives power from the electric motor 12, and an adjustment lever 48 that receives power from the large-diameter side gear 47 and transmits power to the detent rotation plate 51. When the spring 52 is in a predetermined rotation position where the spring 52 is engaged with the convex portion 51 h of the detent rotation plate 51, a gap as a first play portion where power is not transmitted between the large-diameter side gear 47 and the adjustment lever 48. S ₁ and S ₂ are formed, and missing tooth portions 47 e and 47 o are formed as second play portions where the power of the electric motor 12 is not transmitted to the large-diameter side gear 47.

  As a result, even after the shift switching device 10 is switched from the non-parking position to the parking position, after the energization of the electric motor 12 is stopped, the rotation of the electric motor 12 is continued due to its inertia, and power is output from the output shaft 12a. The power is not transmitted to the large-diameter side gear 47 by the toothless portion 47 o provided in the large-diameter side gear 47, so that the power is generated by the contact between the roller 52 r of the detent spring 52 and the concave portion 51 g of the detent rotation plate 51. Impact action due to excessive driving force is avoided. That is, while the power is not transmitted to the large-diameter side gear 47 by the toothless portion 47 o provided in the large-diameter side gear 47, the detent rotation plate 51 is arranged so that the detent spring 52 of the detent spring 52 precedes the power transmission of the electric motor 12. Since it rotates only by the pressing force of the main body 52a, when the roller 52r is engaged with the recess 51g, an impact is not applied, and an effect of prompt engagement is obtained.

  Even when the parking position is switched to the non-parking position, even if power is output from the output shaft 12 a after the energization of the electric motor 12 is stopped, the power is not supplied to the missing tooth portion 47 e provided in the large-diameter gear 47. As a result, the large-diameter side gear 47 is not transmitted, so that the impact action caused by the excessive driving force generated by the contact between the roller 52r of the detent spring 52 and the recess 51f of the detent rotation plate 51 is avoided. In other words, the detent rotation plate 51 has the main body 52a of the detent spring 52 prior to the power transmission of the electric motor 12 while it is not transmitted to the large diameter gear 47 by the toothless portion 47e provided on the large diameter gear 47. Therefore, when the roller 52r is engaged with the recess 51f, an impact is not applied and the effect of prompt engagement is obtained.

In other words, in any shift switching operation, there is no impact when switching is completed, and an effect that the shift can be switched quickly is obtained.
Therefore, in the shift switching device 10 according to the first embodiment, the durability of components such as an electric motor and a power transmission mechanism is improved with a simple structure in which the missing gear portions 47e and 47o are formed in the large-diameter side gear 47. The effect that it can be improved is obtained.

Further, since gaps S ₁ and S ₂ are formed as _first play portions where power is not transmitted between the large-diameter side gear 47 and the adjustment lever 48, the detent is within the range of the first play portions. The rotation plate 51 can be rotated only by the pressing force of the detent spring 52, and accurate rotation positions of the parking position and the non-parking position can be obtained, and an accurate shift position can be obtained. In other words, the pressing force of the detent spring 52 allows the roller 52r to accurately engage with the recess 51g serving as the parking position. In addition, the pressing force of the detent spring 52 allows the roller 52r to accurately engage with the recess 51f that is in the non-parking position.

(Second Embodiment)
20 to 25 are diagrams showing a second embodiment of the shift switching device according to the present invention. The same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted.

  As shown in FIGS. 20 and 21, the shift switching device 70 in the second embodiment is similar to the first embodiment in the case 11, the electric motor 12, the power transmission mechanism 71, the shift switching mechanism 14, and the switch SW1. , SW 2, an electronic control unit (ECU) for controlling the electric motor 12 (not shown), and a fixing screw 15 for fixing the electric motor 12 to the case 11. The shift switching device 70 has a structure that differs from the first embodiment only in the power transmission mechanism 71.

  The power transmission mechanism 71 includes a small-diameter side helical gear 41, a large-diameter side helical gear 72, a rotating shaft 43, bearings 44 and 45, a rotating shaft 46, and a large-diameter composed of a driven wheel as a first power transmitting member. A side ring 73, an adjustment lever 48 as a second power transmission member, and a mounting ring 49 are included.

  The large-diameter side helical gear 72 has a gear 72 a and a small-diameter side ring 72 b as a driving wheel formed integrally with the gear 72 a, and meshes with the small-diameter side helical gear 41 to be transmitted from the small-diameter side helical gear 41. Is greatly decelerated and transmitted to the large-diameter side ring 73 via the small-diameter side ring 72b.

  As shown in FIGS. 22 to 24, the small-diameter side ring 72 b is configured by a ring having a smooth surface, and is in frictional contact with the large-diameter side ring 73.

  22 to 25, the large-diameter side ring 73 is formed with a through hole 73a into which the support portion 46b of the rotation shaft 46 is inserted, and a rotation portion 73b that rotates around the support portion 46b. And a contact portion 73c as a driven wheel formed in a fan shape, and an engagement hole 73d formed therethrough.

The contact portion 73c is formed in an arc shape having a predetermined radius of curvature with the through hole 73a as a center, and has cutout portions 73e and 73f that are partially non-contact with the small diameter side ring 72b.
The notch 73e is formed at the same position as the notch portion 47e formed on the large diameter gear 47 in the first embodiment, and the notch 73f is formed on the large diameter gear 47 in the first embodiment. It is formed at the same position as the missing tooth portion 47o.

  The notches 73e and 73f constitute a second play portion in the shift switching device according to the present invention, and have the same effects as the notch portions 47e and 47o of the large-diameter side gear 47 in the first embodiment. is doing. Further, the notches 73e and 73f constitute a small diameter portion having a radius smaller than the radius of the outer periphery of the contact portion 73c in the shift switching device according to the present invention.

  Since the large-diameter side ring 73 has cutout portions 73e and 73f as small-diameter portions, an extra load is applied to the large-diameter side ring 73 and the small-diameter side ring 72b when the power transmission mechanism 71 is assembled. Can be assembled easily without hanging.

  That is, the large-diameter side ring 73 is located at a position where the small-diameter side ring 72b contacts the notches 73e and 73f while maintaining a predetermined positional relationship between the large-diameter side ring 73 and the adjusting lever 48 and the detent rotation plate 51. As a result, the large-diameter side ring 73 and the small-diameter side ring 72b can be assembled without deformation, and can be assembled while maintaining an appropriate contact pressure. With such an assembling method, power can be transmitted from the small diameter side ring 72b to the large diameter side ring 73 with an optimum frictional force.

  Note that the switching operation of the shift switching device 70 in the second embodiment is performed in substantially the same manner as the switching operation shown in FIGS. 11 to 19A and 19B of the shift switching device 10 in the first embodiment described above. Therefore, the description is omitted.

  Since the shift switching device 70 according to the second embodiment is configured as described above, the following effects are obtained.

  That is, the shift switching device 70 outputs the electric power 12 according to the shift operation, the shift switching mechanism 14 for switching the shift position including the parking position and the non-parking position, and the power of the electric motor 12 for the shift switching mechanism 14. And a power transmission mechanism 71 for transmitting to the vehicle.

  The shift switching mechanism 14 is engaged with the detent rotation plate 51 having the concave portions 51f and 51g and the convex portion 51h corresponding to the shift position, and the concave portions 51f and 51g. And a detent spring 52 for determining a moving position.

The power transmission mechanism 71 further includes a large-diameter side ring 73 that receives power from the electric motor 12 and an adjustment lever 48 that receives power from the large-diameter side ring 73 and transmits power to the detent rotation plate 51. When the spring 52 is in a predetermined rotation position where the spring 52 is engaged with the convex portion 51 h of the detent rotation plate 51, a gap as a first play portion where no power is transmitted between the large-diameter side ring 73 and the adjustment lever 48. S ₁ and S ₂ are formed, and notches 73 e and 73 f are formed as second play portions where the power of the motor 12 is not transmitted to the large-diameter side ring 73.

  As a result, after the shift switching device 70 is switched from the non-parking position to the parking position, after the motor 12 is de-energized, the motor 12 continues to rotate due to its inertia and power is output from the output shaft 12a. However, the power is not transmitted to the large-diameter side ring 73 by the notch 73 f provided in the large-diameter side ring 73, so that the roller 52 r of the detent spring 52 and the recess 51 g of the detent rotation plate 51 are in contact with each other. The impact action caused by the excessive driving force generated in the above is avoided.

  In other words, the detent rotation plate 51 has the main body of the detent spring 52 prior to the power transmission of the electric motor 12 while the power is not transmitted to the large diameter ring 73 by the notch 73 f provided in the large diameter ring 73. Since the roller 52r is rotated only by the pressing force of 52a, when the roller 52r is engaged with the recess 51g, an impact is not applied, and an effect of prompt engagement can be obtained.

  Even when the parking position is switched to the non-parking position, even if power is output from the output shaft 12 a after the energization of the electric motor 12 is stopped, the power is transmitted by the notch 73 e provided in the large-diameter side ring 73. Further, since it is not transmitted to the large-diameter side ring 73, an impact action due to an excessive driving force generated by the contact between the roller 52r of the detent spring 52 and the recess 51f of the detent rotation plate 51 is avoided. In other words, the detent rotation plate 51 is provided with the main body 52a of the detent spring 52 prior to the power transmission of the electric motor 12 while it is not transmitted to the large diameter ring 73 by the notch 73e provided in the large diameter ring 73. Since it rotates only by pressing force, when the roller 52r is engaged with the recess 51f, there is no impact, and the effect of prompt engagement is obtained.

In other words, in any shift switching operation, there is no impact when switching is completed, and an effect that the shift can be switched quickly is obtained.
Therefore, in the shift switching device 10 in the second embodiment, the durability of components such as an electric motor and a power transmission mechanism is improved with a simple structure in which notches 73e and 73f are simply formed in the large-diameter side ring 73. The effect that it can be made is acquired.

Further, as in the first embodiment, gaps S ₁ and S ₂ are formed between the large-diameter side ring 73 and the adjusting lever 48 as first play portions where power is not transmitted. The detent rotation plate 51 can be rotated only by the pressing force of the detent spring 52 within the range of the play portion, and an accurate rotation position of the parking position and the non-parking position can be obtained to obtain an accurate shift position. be able to. In other words, the pressing force of the detent spring 52 allows the roller 52r to accurately engage with the recess 51g serving as the parking position. In addition, the pressing force of the detent spring 52 allows the roller 52r to accurately engage with the recess 51f that is in the non-parking position.

(Third embodiment)
FIG. 26 is a diagram showing a third embodiment of the shift switching device according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The shift switching device 100 according to the third embodiment is provided in an automatic transmission 101 of a vehicle as shown in FIG.
The automatic transmission 101 includes a case 102, a parking lock mechanism 103 that locks and unlocks the rotation of the output shaft 101a of the automatic transmission 101 when the vehicle is stopped, and a transmission mechanism (not shown) that forms a shift stage when the vehicle is traveling. And a hydraulic control device 104 that controls the transmission mechanism with hydraulic pressure.

  As in the first embodiment, the shift switching device 100 is a so-called shift-by-wire shift control system that detects a shift operation input of a driver by a sensor or a switch and selects a shift position according to the detection signal. It is composed. In the shift switching device 100, unlike the first embodiment, a shift position including a parking position and a non-parking position such as a drive position (D) other than the parking position, a neutral position (N), and a reverse position (R) is provided. It is supposed to switch.

  As in the first embodiment, the shift switching device 100 includes an electric motor 111, a shift switching mechanism 112, and a power transmission mechanism 113 that receives power output from the electric motor 111 and transmits power to the shift switching mechanism 112. It consists of

  The electric motor 111 is configured similarly to the electric motor 12 of the first embodiment.

  The shift switching mechanism 112 includes a detent rotation plate 121 and a detent spring 122. The shift switching mechanism 112 is configured to switch between a parking position (P) and a non-parking position in accordance with the operation of the shift lever by the driver. The non-parking position includes, for example, a reverse position (R), a neutral position (N), and a drive position (D), and establishes a gear position corresponding to any position according to the operation of the shift lever by the driver. For this purpose, a manual valve 104a provided in the hydraulic control device 104 is operated.

  As in the first embodiment, the detent rotation plate 121 has a recess corresponding to each of the parking position (P), reverse position (R), neutral position (N), and drive position (D) selected by the shift lever. It is formed on the side 121a. One end of the parking lock mechanism 103 is connected to the other end 121b of the detent rotation plate 121, and the end of the spool 104b of the manual valve 104a is connected to the projecting piece 121c. Yes.

  Further, the detent rotation plate 121 is fixed to one end of the power transmission mechanism 113 so as to be integrally rotatable. Of the parking position (P), the reverse position (R), the neutral position (N), and the drive position (D). When the power transmission mechanism 113 operates corresponding to the position selected by the shift lever, it is tilted in four stages. Further, the detent rotation plate 121 is configured to move the spool 104b of the manual valve 104a in the axial direction according to the tilt thereof.

The detent spring 122 includes an attachment portion 122 a attached to the manual valve 104 a of the hydraulic control device 104, and a roller portion 122 b that engages with each recess of the detent rotation plate 121.
When the roller portion 122b is engaged with any one of the recesses of the detent rotation plate 121, the rotation position of the detent rotation plate 121 is determined. That is, the position is determined as any one of the parking position (P), the reverse position (R), the neutral position (N), and the drive position (D).

The power transmission mechanism 113 is configured in the same manner as the power transmission mechanism 13 of the first embodiment, and although not shown, configures a power transmission mechanism of the shift switching device according to the present invention.
That is, the power transmission mechanism 113 receives the power from the motor 111 and the second power transmission member that receives power from the first power transmission member and transmits power to the detent rotation plate 121 of the shift switching mechanism 112. Power transmission member. When the detent rotation plate 121 is at a predetermined rotation position where the detent spring 122 is engaged with the convex portion of the detent rotation plate 121, the detent rotation plate 121 is between the first power transmission member and the second power transmission member. A first play portion where the power of the first power transmission member is not transmitted to the second power transmission member is formed, and a second play portion where the power of the electric motor 111 is not transmitted to the first power transmission member. Is formed. The power transmission mechanism 113 has a drive gear connected to the output shaft of the electric motor 111, and the first power transmission member has a driven gear that is driven by meshing with the drive gear. The portion is constituted by a missing tooth portion from which predetermined teeth of the driven gear are removed.

  The power transmission mechanism 113 is configured in the same manner as the power transmission mechanism 13 of the first embodiment, so that at least two concave portions and convex portions formed between the concave portions, for example, a parking position (P), reverse It can be applied to two adjacent positions among the position (R), neutral position (N), and drive position (D).

  That is, the power transmission mechanism 113 is similar to the power transmission mechanism 13 of the first embodiment. The small-diameter side helical gear 41, the large-diameter side helical gear 42, the rotating shaft 43, the bearings 44 and 45, and the rotating shaft 46 By including the large-diameter side gear 47 as the first power transmission member, the adjusting lever 48 as the second power transmission member, and the mounting ring 49, it is applied to two adjacent positions. be able to.

  Further, the small-diameter side helical gear 41, the large-diameter side helical gear 42, the large-diameter side gear 47 as the first power transmission member, and the adjustment lever 48 as the second power transmission member are placed in the parking position (P). , Reverse position (R), neutral position (N) and drive position (D) can be formed so as to be applicable to four positions. For example, by forming the toothless portions on the large-diameter side gear 47 corresponding to the above-mentioned four positions, the electric motor 111 corresponds to each of the above-mentioned positions similarly to the power transmission mechanism 13 of the first embodiment. The transmission of the power output from can be partially avoided.

  The parking lock mechanism 103 includes a parking gear 131, a parking pole 132, and a parking rod 133. When the driver operates a shift lever (not shown) to select a parking range, the automatic transmission The rotation of the output shaft 101a 101 is prevented so that the vehicle is stopped.

  The parking gear 131 is fixed to the output shaft 101a of the automatic transmission 101 so that it cannot rotate relative to the output shaft 101a, and rotates together with the output shaft 101a. The parking gear 131 is provided with a plurality of fitting teeth on the outer peripheral surface thereof.

  The parking pole 132 is provided at a position facing the outer peripheral surface of the parking gear 131, and a locking portion 132 a that fits the fitting tooth of the parking gear 131 is formed. The parking pole 132 is configured such that the locking portion 132a can be selectively fitted to the fitting teeth of the parking gear 131. That is, the parking pole 132 is rotatably attached at one end thereof to the case 102 of the automatic transmission 101, for example, so that the parking pole 132 can rotate in any direction approaching or separating from the parking gear 131 with the one end side as a fulcrum. It has become.

  One end of the parking rod 133 is connected to the shift switching mechanism 112 and a tapered cone-shaped parking cam 134 is attached to the other end. The parking rod 133 slides the parking cam 134 in the axial direction according to the tilt of the shift switching mechanism 112.

  In addition, the parking rod 133 pushes the parking cam 134 toward the parking pole 132 in accordance with the tilt of the shift switching mechanism 112, so that the parking pole 132 comes close to the parking gear 131 side and the parking pole 132 is locked. The portion 132a is fitted to the fitting teeth of the parking gear 131.

  In the shift switching device 10 according to the first embodiment, the small-diameter side gear 42b as the driving gear is constituted by a gear having 13 teeth, and the large-diameter side gear 47 as the driven gear is replaced with 19 of a to s. The case where it comprised with what has a missing tooth part of two places among the number of teeth was demonstrated. However, in the shift switching device according to the present invention, the drive gear and the driven gear may be configured with a structure other than the structure of the first embodiment.

  For example, you may make it comprise the number of teeth of the small diameter side gear as a drive gear with less than 13. Further, the small-diameter side gear as the drive gear may be formed larger than that of the first embodiment, and may be configured with a tooth number greater than thirteen. In these cases, the large-diameter side gear as the driven gear may be configured with the number of teeth and the shape corresponding to these small-diameter side gears.

  As described above, the shift switching device according to the present invention can obtain an accurate shift position with a simple structure and can improve durability of components such as an electric motor and a power transmission mechanism. This is effective, and is useful for general shift switching devices for vehicles such as automobiles.

10, 70, 100 Shift switching device 11, 102 Case 12, 111 Electric motor 12a, 101a Output shaft 13, 71, 113 Power transmission mechanism 14, 112 Shift switching mechanism 20, 103 Parking lock mechanism 41 Small-diameter side helical gear 42, 72 Large diameter Side helical gear 42a, 72a Gear 42b Small diameter side gear (drive gear)
43 Rotating shaft 46 Rotating shaft 47 Large-diameter side gear (first power transmission member)
47c Spur tooth (driven gear)
47d engagement hole 47e, 47o missing tooth part (second play part)
47n Inner wall 48 Adjust lever (second power transmission member)
48c Engagement protrusion 51, 121 Detent rotation plate 51f Recessed part (non-parking position)
51g recess (parking position)
51h Convex 51t Top 52, 122 Detent spring 52r Roller 61 Parking rod 72b Small-diameter side ring (drive wheel)
73 Large-diameter side ring (first power transmission member)
73c Contact part (driven wheel)
73e, 73f Notch (second play portion, small diameter portion)
S ₁ and S ₂ gaps (first play portion)
SW1, SW2 limit switch

Claims (4)

An electric motor that outputs power in response to a shift operation;
A shift switching mechanism for switching a shift position comprising a parking position and a non-parking position other than the parking position;
A power transmission mechanism for transmitting the power of the electric motor to the shift switching mechanism;
In the shift switching device provided with
The shift switching mechanism has a concave portion corresponding to the shift position and a convex portion formed between the concave portions and rotates, and a detent rotation plate that engages with the concave portion and rotates the detent rotation plate And a detent spring that determines the position,
The power transmission mechanism includes a first power transmission member that receives power from the electric motor, and a second power transmission member that receives power from the first power transmission member and transmits power to the detent rotation plate. Have
When the detent spring is in a predetermined rotation position where the detent spring is engaged with the convex portion of the detent rotation plate, the second power transmission member is disposed between the first power transmission member and the second power transmission member. A first play portion where the power of the first power transmission member is not transmitted is formed on the power transmission member, and a second play portion where the power of the electric motor is not transmitted is formed on the first power transmission member. A shift switching device characterized by that.   The power transmission mechanism includes a drive gear coupled to the output shaft of the electric motor, and the first power transmission member includes a driven gear that is engaged with and driven by the drive gear. The shift switching device according to claim 1, wherein the portion is constituted by a missing tooth portion from which predetermined teeth of the driven gear are removed.   The power transmission mechanism has a drive wheel connected to the output shaft of the electric motor, the first power transmission member has a driven wheel that frictionally contacts the drive wheel, and the second play portion is 2. The shift switching device according to claim 1, wherein the shift switching device is configured by a small diameter portion having a radius smaller than a radius of the outer periphery at a predetermined outer peripheral position of the driven wheel. The first power transmission member has an engagement hole that engages with the second power transmission member and is connected to the rotation shaft so as to rotate around the rotation shaft;
The second power transmission member has an engagement projection inserted into the engagement hole, is connected to the rotation shaft so as to rotate together with the rotation shaft, and the detent rotation plate Connected to the detent rotation plate to rotate together,
Power is transmitted from the first power transmission member to the second power transmission member by engaging the inner wall of the first power transmission member surrounding the engagement hole and the engagement protrusion.
The said 1st play part is comprised by the clearance gap defined between the said engagement protrusion and the said inner wall, The claim of any one of Claim 1 thru | or 3 characterized by the above-mentioned. Shift switching device.

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