JP4296596B2 - Inhibitor switch structure of automatic transmission - Google Patents

Description

  The present invention relates to an inhibitor switch structure for an automatic transmission.

  Conventionally, an inhibitor switch structure for detecting a select position of a range selector has been proposed in an automatic transmission that switches a range by operating a manual valve in accordance with a select position of a range selector such as a select lever (patent) References 1 and 2).

  In the inhibitor switch structure of Patent Document 1, a circular portion fixed to a plate rotating to a position corresponding to a select position of a select lever is engaged with a holder fixed to a spool of a manual valve, and the movable pin of the position sensor is engaged with the holder. Is engaged. As a result, the spool is driven to a position corresponding to the rotational position of the plate and the range of the automatic transmission is switched, and the movable pin is driven to a position corresponding to the rotational position of the plate and the select position of the select lever is changed. It is detected by a position sensor.

  In the inhibitor switch structure of Patent Document 2, the valve pin fixed to the spool of the manual valve is engaged with a plate that rotates to a position corresponding to the select position of the select lever, and the contact portion of the position sensor is slid onto the conduction region of the plate. Touching. As a result, the spool is driven to a position corresponding to the rotational position of the plate, the range of the automatic transmission is switched, and the sliding contact position of the contact portion with respect to the conductive region is moved to a position corresponding to the rotational position of the plate. The select position of the select lever is detected by the position sensor.

US Pat. No. 6,098,482 US Pat. No. 5,325,083

  In the inhibitor switch structure of Patent Document 1, since the circular portion and the movable pin are engaged with the holder fixed to the spool, the spool is easily deformed by the force received by the holder from the circular portion and the movable pin. Further, since the circular portion and the movable pin are engaged with the same holder, the movement amount per unit rotation angle of the plate is equal between the circular portion and the movable pin. In order to switch the range reliably, the amount of movement of the circular part that drives the spool needs to be set to be large to some extent. Therefore, the size of the position sensor in the moving direction of the movable pin in which the amount of movement per unit angle becomes equal to the circular part. It will increase. Furthermore, since the movable pin is engaged with the fixed holder at the end of the spool, the position of the position sensor is limited. Furthermore, since the circular portion is inserted into the U-shaped groove of the holder and the movable pin is inserted into the long hole of the holder and engaged, the gap between the U-shaped groove and the circular portion and the long hole are A clearance is formed between each of the movable pins. Therefore, when the plate rotates in the direction opposite to that before realizing the range from the state where the predetermined range is realized, the circular portion first moves by the clearance between the U-shaped groove and engages with the U-shaped groove. Then, after the holder moves together with the spool by the clearance between the long hole and the movable pin and engages with the movable pin, the movable pin starts moving. Therefore, a large deviation occurs between the start of range switching by the manual valve and the start of selection position switching detected by the position sensor.

In the inhibitor switch structure of Patent Document 2, since the conduction region of the rotating plate is easily separated from the contact portion of the position sensor, poor electrical contact between the conduction region and the contact portion, and thus detection failure by the position sensor, is likely to occur. . Further, since the valve pin is inserted and engaged with the cam groove of the plate, a clearance is formed between the cam groove and the valve pin. Therefore, when the plate rotates from the state where the predetermined range is realized in the direction opposite to that before the range is realized, the plate rotates after the clearance between the cam groove and the valve pin and engages the valve pin. Starts moving. Therefore, a large deviation occurs between the start of range switching by the manual valve and the start of selection position switching detected by the position sensor.
An object of the present invention is to provide an inhibitor switch structure for an automatic transmission that solves the above-described problems.

  According to the first aspect of the present invention, the first driving member that drives the spool of the manual valve and the movable member of the position sensor are driven by the rotating member that rotates to the position corresponding to the select position of the range selector. A second drive member is fixed. Here, the eccentric distance of the first drive member relative to the rotation center of the rotation member is the first distance, and the eccentric distance of the second drive member relative to the rotation center of the rotation member is a second distance shorter than the first distance. is there. Therefore, the second drive member is smaller than the first drive member with respect to the movement amount of the rotation member per unit rotation angle. Therefore, even if the amount of movement of the first drive member is set to a certain extent in order to switch the range reliably, the amount of movement of the second drive member can be kept small. The size of the position sensor becomes smaller in the direction.

  According to the first aspect of the present invention, the second drive member can be fixed at various positions of the rotating member as long as the second distance satisfies the above-described condition. The degree of freedom of arrangement of the position sensor with which the member is engaged increases.

  Further, according to the first aspect of the present invention, the second drive member fixed to the rotating member engages with the movable member of the position sensor, so that the movable member is attached to the manual valve for the purpose of driving the movable member. There is no need to engage the spool. As a result, the spool receives a force directly from the first drive member engaged with the spool, but does not receive a force directly from the movable member, so that the twist deformation can be prevented.

  Still further, according to the first aspect of the present invention, the second drive member fixed to the rotating member mechanically engages the movable member of the position sensor, so that the second drive member is detached from the movable member. It is easy to prevent. Therefore, in the position sensor that detects the selection position of the range selector based on the movement position of the movable member, it is difficult for detection failure to occur.

According to the second aspect of the present invention, the maximum dimension in the moving direction of the spool is the first dimension between the first insertion hole and the first driving member into which the first driving member is inserted in the spool of the manual valve. A clearance (hereinafter referred to as a first clearance) is formed. Further, a clearance (hereinafter referred to as a first dimension) between the second insertion hole into which the second driving member is inserted in the movable member of the position sensor and the second driving member, where the maximum dimension in the moving direction of the movable member is the second dimension. Two clearances) are formed. Here, when the first dimension and the second dimension are δ ₁ and δ ₂ respectively, and the first distance and the second distance are r ₁ and r ₂ , respectively, δ ₁ / r ₁ = δ ₂ / r ₂ Is established. In such an invention, when the rotating member rotates from the state in which the predetermined range is realized in the direction opposite to that before the range is realized, the first drive member moves while the maximum dimension of the first clearance. The two drive members move by the maximum dimension of the second clearance. Therefore, after the first driving member and the second driving member are engaged with the corresponding first insertion hole and second insertion hole almost simultaneously, the spool and the movable member start to move almost simultaneously. Therefore, a deviation hardly occurs between the start of the range switching by the manual valve and the start of the selection position switching detected by the position sensor.

  According to the invention described in claim 3, since the second drive member is disposed between the rotation center of the rotation member and the first drive member, the structure of the inhibitor switch structure is changed in the radial direction of the rotation member. Can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an inhibitor switch structure 2 of an automatic transmission according to an embodiment of the present invention. The automatic transmission to which the inhibitor switch structure 2 of the present embodiment is applied includes a plurality of friction elements that are engaged or released according to the hydraulic pressure applied from the hydraulic circuit, and the range according to the combination of engagement and release of each friction element. Will switch. Here, a parking (P) range, a reverse (R) range, a neutral (N) range, and a forward (D) range are prepared as ranges of the automatic transmission. The inhibitor switch structure 2 applied to such an automatic transmission includes a detent plate 10, a detent spring 20, a manual valve 30, a valve side drive pin 50, a position sensor 60, and a sensor side drive pin 90.

  In the flat detent plate 10, the rotation shaft 11 perpendicular to the plate surfaces 10 a and 10 b is supported by the case of the automatic transmission, and the detent plate 10 is around the rotation center O that is the center of the rotation shaft 11. It can be turned. That is, in this embodiment, the detent plate 10 corresponds to a “rotating member”. In the following description, among the rotation directions of the detent plate 10, the clockwise direction in FIGS. 1, 3 to 5 is referred to as a normal rotation direction X, and the counterclockwise direction in FIGS. To do. As shown in FIG. 6, the rotation shaft 11 is connected to a select lever 16 as a “range selector” via a link mechanism 14. The select lever 16 is provided with four select positions of P, R, N, and D, and the detent plate 10 rotates to a position corresponding to the select position of the select lever 16.

  Specifically, the detent plate 10 rotates to the position P shown in FIG. 3 when the select lever 16 is operated to the select position P, and the position R shown in FIG. 1 when the select lever 16 is operated to the select position R. Rotate to. Further, the detent plate 10 rotates to the position N shown in FIG. 4 when the select lever 16 is operated to the select position N, and to the position D shown in FIG. 5 when the select lever 16 is operated to the select position D. And turn. In this embodiment, the positions P, R, N, and D appear in this order as the detent plate 10 rotates in the normal rotation direction X.

As shown in FIG. 1, four grooves 18 are formed on the outer peripheral edge of the detent plate 10.
The other end portion 20b of the detent spring 20 having the one end portion 20a attached to the case of the automatic transmission is fitted into one of the groove portions 18 according to the rotational position of the detent plate 10 (FIGS. 1, 3 to 5). See). Due to this fitting action, the detent plate 10 reliably stops rotating when the select lever 16 is not operated, and is positioned at a desired rotating position.

  The manual valve 30 has a valve body 31 and a spool 41. The valve body 31 is formed in a cylindrical shape and is attached to the case of the automatic transmission. In the valve body 31, a D range pressure port 32, a line pressure port 33, an R range pressure port 34, and a drain pressure port 35 are formed in order from the one end portion 31 a side in the axial direction toward the other end portion 31 b side. The line pressure port 33 is connected to line pressure generating means such as a hydraulic pump that generates line pressure, and is supplied with line pressure from the line pressure generating means. The D range pressure port 32 is connected to a hydraulic circuit that applies a hydraulic pressure to a friction element engaged in the D range in the automatic transmission, and supplies the hydraulic pressure to the hydraulic circuit. The R range pressure port 34 is connected to a hydraulic circuit that applies a hydraulic pressure to a friction element that is engaged in the R range in the automatic transmission, and supplies the hydraulic pressure to the hydraulic circuit. The drain pressure port 35 is connected to a drain that is open to the atmosphere, and discharges hydraulic oil to the drain. In the present embodiment, the end 31a of the valve body 31 is also connected to the drain, and the hydraulic oil can be discharged from the end 31a to the drain.

  The spool 41 is accommodated on the inner peripheral side of the valve body 31 and supported by the valve body 31, and can reciprocate in the axial direction. In the following description, among the reciprocating movement directions of the spool 41, the right direction in FIGS. 1 to 5 and 7 is the forward direction S, and the left direction in FIGS. In the spool 41, a first land 42 is formed at one end 41a in the axial direction, and a second land 43 is formed on the other end 41b side from the end 41a. The range of the automatic transmission is switched by changing the overlapping positions of the lands 42, 43 and the peripheral wall portions 36, 37, 38, 39, 40 of the valve body 31 according to the movement position of the spool 41.

  Specifically, when the spool 41 moves to the position P shown in FIG. 3, the first land 42 overlaps the peripheral wall portions 37, 38 on both sides of the line pressure port 33, and the R range pressure port 34 of the drain pressure port 35 The second land 43 overlaps the peripheral wall 40 on the opposite side. As a result, the line pressure port 33 is disconnected from all other ports 32, 34, and 35, so that the line pressure is not supplied to both the D range pressure port 32 and the R range pressure port 34. Range is realized.

  When the spool 41 moves to the position R shown in FIG. 1, the first land 42 overlaps the peripheral wall portion 37 between the line pressure port 33 and the D range pressure port 32, and the drain pressure port 35 and the R range pressure port 34. The second land 43 overlaps the peripheral wall 39 between the two. As a result, the line pressure port 33 communicates with the R range pressure port 34, so that the line pressure is supplied to the R range pressure port 34 and the R range is realized in the automatic transmission. At this time, the D range pressure port 32 is not in communication with the line pressure port 33 and communicates with the drain through the end 31 a of the valve body 31, so that no line pressure is supplied to the D range pressure port 32.

  When the spool 41 moves to the position N shown in FIG. 4, the first land 42 overlaps the peripheral wall portion 37 between the line pressure port 33 and the D range pressure port 32, and the line pressure port 33 and the R range pressure port 34. The second land 43 overlaps the peripheral wall 38 between the two. As a result, the line pressure port 33 is disconnected from all other ports 32, 34, and 35, so that no line pressure is supplied to both the D range pressure port 32 and the R range pressure port 34. Range is realized.

When the spool 41 moves to the position D shown in FIG. 5, the first land 42 overlaps the peripheral wall portion 36 of the D range pressure port 32 opposite to the line pressure port 33, and the line pressure port 33 and the R range pressure port The second land 43 overlaps the peripheral wall portion 38 between the second land 43 and the peripheral wall portion 34. As a result, the line pressure port 33 communicates with the D range pressure port 32, so that the line pressure is supplied to the D range pressure port 32 and the D range is realized in the automatic transmission. At this time, since the R range pressure port 34 is not in communication with the line pressure port 33 and is in communication with the drain pressure port 35, no line pressure is supplied to the R range pressure port 34.
In this embodiment, as the spool 41 moves in the positive direction S, the positions P, R, N, and D appear in this order.

As shown in FIGS. 1 and 2, the valve-side drive pin 50 is fixed to the detent plate 10 so as not to be relatively displaced, and can be rotated together with the detent plate 10. The valve side drive pin 50 protrudes in a cylindrical shape from one plate surface 10a of the detent plate 10 and is eccentric with respect to the rotation center O by a predetermined distance r ₁ (see FIG. 8). A valve-side insertion hole 44 having a constant width in the moving direction of the spool 41 is formed at the end 41 b of the spool 41, and the valve-side drive pin 50 is inserted into the valve-side insertion hole 44. A minute clearance 48 having a maximum dimension of a predetermined dimension δ ₁ is formed between the valve side drive pin 50 and the side wall portions 45 and 46 of the valve side insertion hole 44 in the moving direction of the spool 41. When the detent plate 10 rotates in the forward rotation direction X, as shown in FIG. 2, the valve side drive pin 50 engages the side wall 45 on the positive direction S side of the valve side insertion hole 44 to move the spool 41 in the forward direction. Drive to S. On the other hand, when the detent plate 10 rotates in the reverse rotation direction Y, as shown in FIG. 7, the valve side drive pin 50 engages with the side wall portion 46 on the reverse direction T side of the valve side insertion hole 44 to reverse the spool 41. Drive in the direction T. By such an operation, the spool 41 moves to positions P, R, N, and D corresponding to the rotational positions P, R, N, and D of the detent plate 10, respectively.
As described above, in the present embodiment, the valve side drive pin 50 corresponds to the “first drive member”, the eccentric distance r ₁ with respect to the rotation center O corresponds to the “first distance”, and the maximum dimension δ _{1 of the} clearance 48 is Corresponds to "first dimension".

  As shown in FIGS. 1 and 2, the position sensor 60 includes a housing 61, a movable member 71, and a detection circuit 81. The housing 61 is attached to the case of the automatic transmission. The movable member 71 is supported by the housing 61 so as to be capable of reciprocating in the direction along the axial direction of the spool 41. In the following description, among the reciprocating directions of the movable member 71, the right direction in FIGS. 1 to 5 and 7 is referred to as the forward direction U, and the left direction in FIGS. The detection circuit 81 is configured by an electric circuit, predicts and detects the select position of the select lever 16 based on the moving position of the movable member 71, and outputs a signal representing the detection result. Specifically, the detection circuit 81 outputs a signal indicating the select position P when the movable member 71 moves to the position P shown in FIG. 3, and selects the select position R when the movable member 71 moves to the position R shown in FIG. Output a signal that represents Further, the detection circuit 81 outputs a signal representing the select position N when the movable member 71 moves to the position N shown in FIG. 4, and represents the select position D when the movable member 71 moves to the position D shown in FIG. Output a signal. In this embodiment, as the movable member 71 moves in the positive direction U, the positions P, R, N, and D appear in this order.

As shown in FIGS. 1 and 2, the sensor-side drive pin 90 is fixed to the detent plate 10 so as not to be relatively displaced, and can be rotated together with the detent plate 10. The sensor side drive pin 90 protrudes in a cylindrical shape from one plate surface 10a of the detent plate 10, and is eccentric with respect to the rotation center O by a predetermined distance r ₂ (see FIG. 8). The movable member 71 has a sensor-side insertion hole 74 having a constant width in the moving direction of the movable member 71, and the sensor-side drive pin 90 is inserted into the sensor-side insertion hole 74. A minute clearance 78 having a maximum dimension of the predetermined dimension δ ₂ is formed between the sensor side drive pin 90 and the side wall portions 75 and 76 of the sensor side insertion hole 74 in the moving direction of the movable member 71. When the detent plate 10 rotates in the forward rotation direction X, as shown in FIG. 2, the sensor side drive pin 90 engages with the side wall portion 75 on the positive direction U side of the sensor side insertion hole 74 to move the movable member 71 forward. Drive in the direction U. On the other hand, when the detent plate 10 rotates in the reverse direction, the sensor side drive pin 90 engages with the side wall portion 76 on the reverse side V of the sensor side insertion hole 74 as shown in FIG. Drive in the direction V. With this operation, the movable member 71 moves to positions P, R, N, and D corresponding to the rotational positions P, R, N, and D of the detent plate 10, respectively.
As described above, in the present embodiment, the sensor-side drive pin 90 corresponds to the “second drive member”, the eccentric distance r ₂ with respect to the rotation center O corresponds to the “second distance”, and the maximum dimension δ _{2 of the} clearance 78 is Corresponds to “second dimension”.

  In this embodiment, when the select position of the select lever 16 is switched, the rotation position of the detent plate 10 is switched to a position corresponding to the select position of the switching destination. Then, the movement position of the spool 41 is switched to a position corresponding to the rotational position of the detent plate 10 at the switching destination, and a range corresponding to the moving position, that is, a range corresponding to the selection position of the switching destination is realized in the automatic transmission. The At the same time, the moving position of the movable member 71 is switched to a position corresponding to the rotational position of the switching destination of the detent plate 10, and a signal indicating the selection position of the switching destination is output from the detection circuit 81.

Next, the eccentric distances r ₁ and r ₂ of the drive pins 50 and 90 with respect to the rotation center O of the detent plate 10 and the clearances 48 and 78 between the drive pins 50 and 90 and the corresponding insertion holes 44 and 74, respectively. A method for setting the maximum dimensions δ ₁ and δ ₂ will be described.
(I) In order to switch the range reliably by the manual valve, the distances between the movement positions P, R, N, and D of the spool 41 are increased to some extent, and the lands 42 and 43 of the spool 41 and the valve body 31 are It is necessary to take a large overlapping portion with the peripheral wall portions 36, 37, 38, 39, and 40. Therefore, it is desirable to increase the movement amount θ ₀ · r ₁ per unit rotation angle θ ₀ of the detent plate 10 for the valve side drive pin 50 engaged with the spool 41. On the other hand, in order to reduce the physique of the position sensor 60, it is necessary to reduce the moving range of the movable member 71. Therefore, the sensor-side drive pin 90 engaged with the movable member 71 is rotated by the unit of the detent plate 10. It is desirable to reduce the movement amount θ ₀ · r ₂ per angle θ ₀ . In the present embodiment above, as the eccentric distance r ₂ of the sensor-side drive pin 90 against rotation center O as shown in FIG. 8 is shorter than the eccentric distance r ₁ of the valve-side driving pin 50 against rotation center O, the eccentric The distances r ₁ and r ₂ are set.

(II) When the select position of the select lever 16 is switched from, for example, the position P to the position R and the R range is realized, the drive pins 50 and 90 are respectively inserted into the corresponding insertion holes 44 and 74 as shown in FIG. The side wall portions 45 and 75 on the positive direction S and U side are engaged. As a result, clearances 48 and 78 of the maximum dimensions δ ₁ and δ ₂ correspond between the drive pins 50 and 90 and the side wall portions 46 and 76 on the opposite sides T and V of the corresponding insertion holes 44 and 74, respectively. It occurs in the moving direction of the elements 41 and 71. In this state, when the select position is switched from the position R to the position P, the detent plate 10 is rotated in the reverse rotation direction Y, and the drive pins 50 and 90 are in the opposite T and V side wall portions 46 and 76. Start moving towards. After this, as shown in FIG. 7, if the drive pins 50 and 90 are engaged with the side wall portions 46 and 76 on the reverse direction T and V sides almost simultaneously, the corresponding elements 41 and 71 start moving almost simultaneously. Thus, it is difficult for a deviation to occur between the start of the range switching by the manual valve 30 and the start of the selection position switching detected by the position sensor 60. Such a principle is applied when the detent plate 10 rotates in the direction opposite to that before the realization of an arbitrary range.

Therefore, in the present embodiment, the drive pins 50 and 90 move when the rotation angle of the detent plate 10 that rotates in the direction opposite to that before the range is realized becomes the predetermined angle θ from the state in which the range is realized. The inhibitor switch structure 2 is designed so that the quantities θ · r ₁ and θ · r ₂ coincide with the maximum dimensions δ ₁ and δ _{2 of the} corresponding clearances 48 and 78, respectively. That is, in the present embodiment, the eccentric distances r ₁ and r ₂ and the maximum dimensions δ ₁ and δ ₂ are set so that (Expression 3) obtained from the following (Expression 1) and (Expression 2) is satisfied. Needless to say, the eccentric distances r ₁ and r ₂ are set so as to satisfy the condition r ₁ > r ₂ described in (I) above.
(Formula 1) δ ₁ = θ · r ₁
(Formula 2) δ ₂ = θ · r ₂
(Formula 3) δ ₁ / r ₁ = δ ₂ / r ₂

In the inhibitor switch structure 2 described above, the sensor-side drive pin 90 is smaller than the valve-side drive pin 50 with respect to the movement amount per unit rotation angle θ ₀ of the detent plate 10 by the setting of (I) above. . Therefore, even if the movement amount of the valve-side drive pin 50 is set to be large to some extent, the movement amount of the sensor-side drive pin 90 can be kept small, so that in the movement direction of the movable member 71 with which the sensor-side drive pin 90 is engaged. The physique of the position sensor 60 becomes small.

  In the inhibitor switch structure 2, the sensor-side drive pin 90 fixed to the detent plate 10 engages with the movable member 71, so that the movable member 71 is connected to the spool 41 of the manual valve 30 for the purpose of driving the movable member 71. It is not engaged with. As a result, the spool 41 receives a driving force directly from the sensor-side driving pin 90, but does not receive a force directly from the movable member 71, thereby preventing twisting deformation.

  Further, in the inhibitor switch structure 2, the sensor side drive pin 90 fixed to the detent plate 10 is inserted into the sensor side insertion hole 74 of the movable member 71 and mechanically engaged. It is difficult to leave 71. Therefore, in the position sensor 60 that detects the select position of the select lever 16 based on the movement position of the movable member 71, a detection failure due to the separation of the sensor side drive pin 90 from the movable member 71 is avoided.

Furthermore, in the inhibitor switch structure 2, when the detent plate 10 is rotated from the realization state of the predetermined range to the direction opposite to that before the realization of the range by the setting of (II) above, the valve side drive pin 50 is cleared by the clearance 48. while moving largest dimension [delta] ₁ of minute, sensor side drive pin 90 moves maximum dimension [delta] ₂ minutes clearance 78. Thus, after the valve side drive pin 50 and the sensor side drive pin 90 are engaged with the corresponding valve side insertion hole 44 and sensor side insertion hole 74 almost simultaneously, the spool 41 and the movable member 71 move almost simultaneously. Begin to. Therefore, a deviation hardly occurs between the start of the range switching by the manual valve 30 and the start of the selection position switching detected by the position sensor 60.

Further, in the inhibitor switch structure 2, the sensor side drive pin 90 is placed at various locations on the detent plate 10 as long as the eccentric distance r ₂ with respect to the rotation center O of the detent plate 10 satisfies the conditions (I) and (II). Can be fixed. For example, a sensor-side drive pin 90 may be disposed between the rotation center O and the valve-side drive pin 50 as shown in FIG. 1, or the valve is sandwiched between the rotation center O as shown in FIG. The sensor side drive pin 90 may be disposed on the side opposite to the side drive pin 50. In this way, the arrangement position of the sensor-side drive pin 90 can be set freely to some extent, so that the degree of freedom of arrangement of the position sensor 60 in which the sensor-side drive pin 90 engages the movable member 71 can be increased. . When the sensor-side drive pin 90 is disposed between the rotation center O and the valve-side drive pin 50, the physique of the detent plate 10 in the radial direction of the detent plate 10 as shown in FIG. The physique of the inhibitor switch structure 2 can be made smaller than that shown in FIG.

As mentioned above, although one Embodiment of this invention was described, this invention is not limitedly interpreted by this embodiment.
For example, in the above-described embodiment, the select lever 16 is used as the “range selector”, but a device that can switch the select position corresponding to the range of the automatic transmission by operating a button or the like may be used as the “range selector”. Good. In the above-described embodiment, the select lever 16 as the “range selector” and the detent plate 10 as the “rotating member” are mechanically connected via the link mechanism 14. And the detent plate 10 may be electrically connected by a shift-by-wire method.

Furthermore, in the above-described embodiment, the eccentric distances r ₁ and r ₂ and the maximum dimensions δ ₁ and δ ₂ are set so that the above (Expression 3) is satisfied, but the above (Expression 3) is not satisfied. Also good.
Furthermore, in the above-described embodiment, an example in which the present invention is applied to an automatic transmission in which four types of ranges P, R, N, and D are prepared has been described. In addition, the present invention may be applied to an automatic transmission provided with a low range, a second speed range, and the like.

It is a fragmentary sectional front view which shows the inhibitor switch structure by one Embodiment of this invention. It is a top view which expands and shows the principal part of the inhibitor switch structure by one Embodiment of this invention. It is a figure for demonstrating the action | operation of the inhibitor switch structure by one Embodiment of this invention, Comprising: It is a fragmentary sectional front view corresponding to FIG. It is a figure for demonstrating the action | operation of the inhibitor switch structure by one Embodiment of this invention, Comprising: It is a fragmentary sectional front view corresponding to FIG. It is a figure for demonstrating the action | operation of the inhibitor switch structure by one Embodiment of this invention, Comprising: It is a fragmentary sectional front view corresponding to FIG. It is a schematic diagram which shows the connection state of the detent plate of the inhibitor switch structure by one Embodiment of this invention, and a select lever. FIG. 3 is a diagram for explaining the operation of the inhibitor switch structure according to the embodiment of the present invention, and is a plan view corresponding to FIG. 2. It is a schematic diagram for demonstrating the setting method of the eccentric distance by one Embodiment of this invention. It is a figure which shows the modification of the inhibitor switch structure by one Embodiment of this invention, Comprising: It is a fragmentary sectional front view equivalent to FIG. It is a figure which shows the modification of the inhibitor switch structure by one Embodiment of this invention, Comprising: It is a fragmentary sectional front view equivalent to FIG.

Explanation of symbols

2 Inhibitor switch structure, 10 Detent plate (rotating member), 11 Rotating shaft, 16 Select lever (Range selector), 20 Detent spring, 30 Manual valve, 31 Valve body, 41 Spool, 44 Valve side insertion hole (1st (Insertion hole), 48 clearance, 50 valve side drive pin (first drive member), 60 position sensor, 61 housing, 71 movable member, 74 sensor side insertion hole (second insertion hole), 78 clearance, 81 detection circuit, 90 Sensor side drive pin (second drive member)

Claims (3)

A rotating member that rotates to a position corresponding to the select position of the range selector;
A first drive member fixed to the pivot member, wherein the eccentric distance relative to the pivot center of the pivot member is a first distance;
A manual which has a spool engaged with the first drive member and driven by the first drive member to a position corresponding to the rotation position of the rotation member, and which switches the range of the automatic transmission according to the movement position of the spool A valve,
A second drive member fixed to the pivot member, wherein the eccentric distance relative to the pivot center of the pivot member is a second distance shorter than the first distance;
A movable member that is engaged by the second drive member and is driven by the second drive member to a position corresponding to the rotational position of the rotational member; A position sensor for detecting the select position;
An automatic switch inhibitor switch structure characterized by comprising: A first insertion hole into which the first drive member is inserted into the spool, wherein a maximum dimension of a clearance formed between the first drive member in the moving direction of the spool is a first dimension; The manual valve has an insertion hole,
The second insertion hole into which the second drive member is inserted in the movable member, and the maximum dimension of the clearance formed between the second drive member in the moving direction of the movable member is the second dimension. The position sensor has a second insertion hole;
Said first dimension and [delta] _1, the second dimension and [delta] _2, the first distance and _{r 1,} when the second distance was _{r 2, δ 1 / r 1} = δ 2 / r 2 is The inhibitor switch structure for an automatic transmission according to claim 1, wherein:   The inhibitor switch structure for an automatic transmission according to claim 1 or 2, wherein the second drive member is disposed between a rotation center of the rotation member and the first drive member.

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