JP2003234048A - Control switch for automatic shift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control switch for an automatic shift making a position of contact and opening of a moving contact in high precision. <P>SOLUTION: An arcuate rib 32 is formed projecting from an inner wall surface of a base 7. Height A of the rib 32 is formed higher than the height B of a fixed contact 7. Furthermore, an end surface on an end surface side of the fixed contact 7 is made an arc surface 32A and the radius R of the arc surface 32A is set to be approximately the same as the height A. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for generating a position signal indicating a shift position such as parking, reverse, neutral, drive, second speed, first speed, by a shift lever switching operation of an automatic transmission in an automobile. The present invention relates to a transmission control switch.

[0002]

2. Description of the Related Art Conventionally, in a vehicle equipped with an automatic transmission, a shift operation of a shift lever causes parking, reverse,
A control switch for an automatic transmission that generates a position signal indicating a shift position of the automatic transmission such as neutral, drive, second speed, and first speed is used, and an operation command is issued to a microcomputer of a control system according to each position signal. To give.

As an example of this kind of automatic transmission control switch, as shown in FIGS. 9 to 12, a cover 51a made of aluminum die casting and a synthetic resin attached to the cover 51a via a rubber packing 66 are used. A housing 51 including a base 51b and a movable body 60 rotatably housed in the housing 51 are provided. The housing 51 is attached to the automatic transmission ATM as shown in FIG. 9 and the shift lever is operated. The movable body 6 is attached to the manual shaft 41 for shift switching which rotates according to
For some, 0 is fixed. The movable body 60 rotates integrally with the manual shaft 41 according to the rotation of the shift lever, and has a shaft portion 61 fixed to the manual shaft 41, and a recessed portion 5 of the cover 51a provided so as to project from the shaft portion 61.
2 has a contact holder 62 made of synthetic resin that rotates in a space formed by 2 and uses a tightening nut 6 to rotate the shaft portion 61.
Are fastened and fixed to the manual shaft 41. The housing 51 is provided with a bearing portion 53 that rotatably supports the shaft portion 61. Annular rubber seals 65a and 65b are formed in the annular recess formed on the inner peripheral surface of the bearing 53.
Is installed.

On the inner surface of the base 51b, arc-shaped fixed contacts 54a, 54b _1, ..., 54c, 54d _1, ... Are arranged by inserts on four concentric circles centered on the center of rotation of the movable body 60. These fixed contacts 54a, 54
b ₁ ..., 54c, the output circuit consisting of connected lead terminal 54d ₁ ... is through the connector terminals in the connector portion 55 provided at the upper portion of the housing 51 in diagram disposed in a recess of the outer base 51b Have been outsourced to the outside. The concave portion on the outer side of the base 51b is filled with an adhesive 56 to seal the output circuit from the outside.

On the innermost circumference of the above fixed contacts
The fixed contact 54a of is a signal corresponding to each shift position.
A common fixed contact for energizing the system circuit and backlight
It is configured to rotate the movable body 60 corresponding to each shift position.
Formed by an arc-shaped conductive plate that includes all turning angle positions
And fixed contacts 54b arranged on the second circumference ₁
Of the ..., The smallest number with respect to the reference line L in FIG.
Corresponds to the turning angle position, that is, the parking position (P)
Fixed contact 54b₁Is the parking position
Fixed contact for extracting the position signal of
I am configuring. Also, it is the second smallest with respect to the reference line L.
To the wrong rotation angle position, that is, the reverse position (R).
Corresponding fixed contact 54₂Is in reverse position
Fixed contact and bar for extracting the position signal of (R)
Fixed contacts for turning on / off the power of the backlight
It also serves as a fixed contact. In addition to the reference line L
And the third smallest rotation angle position, that is, neutral
Fixed contact 54 provided corresponding to position (N)₃
Takes the position signal of the neutral position (N).
It constitutes a fixed contact for protrusion. Furthermore, the above groups
The fourth smallest rotation angle position with respect to the line L,
Fixed contact provided for live position (D)
54_FourDrive position (D) position signal
It constitutes a fixed contact for taking out. Similarly, the above groups
5th smallest rotation angle position with respect to the line L, that is, 2
Fixed contact 5 provided for the high speed position (D)
Four_FiveTakes the position signal of the second speed position (2)
It forms a fixed contact for output and has the largest rotation angle position.
Position, that is, the position (L) corresponding to the 1st speed is provided.
Fixed contact 54₆Is the 1st position (L) position
A fixed contact for extracting the position signal.
It

Fixed contacts 54c arranged on the third circumference
Constitutes a common fixed contact for turning on / off the energization path to the start motor at the parking position (P) and the neutral position (N), and the length thereof is from the parking position (P) to the neutral position (N). It corresponds to the rotation angle range of the movable body 60 up to.

The fixed contact 5 arranged on the fourth circumference
4d ₁ and 54d ₂ are electrically connected to each other to form fixed contacts for turning on / off the energization path to the start motor at the parking position (P) and the neutral position (N). On the surface of the contact holder 62 facing the base, movable contacts 63A and 63B biased by a spring 64 toward the cover 51b side are arranged in a row in the radial direction from the center of rotation. Is formed to have a length dimension extending over the circumference of the circle and the circumference of the second circle, and is adapted to move on both circles. Further, the movable contact 63A is formed to have a length dimension extending over the third circumference and the fourth circumference so as to move on both circumferences.

FIG. 14 shows a conceptual circuit configuration of the electrical connection of the automatic transmission control switch. The contact ST at the starter position of the ignition switch SW is opened / closed by the movable contact 63B of the automatic transmission control switch. The fixed contact 54c is connected to the fixed contact 54c, and the contact IG which is closed after the ignition switch SW is started is connected to the fixed contact 54b which is opened and closed by the movable contact 63A of the automatic transmission control switch. That is, these fixed contacts 54c and 54b are the non-ground side electrodes of the vehicle-mounted battery BT, in this case the positive electrode is the ignition switch SW.
Connected via. In addition, fixed contacts 54d ₁ and 54d opened and closed by the movable contact 63A between the fixed contacts 54c and
₂ has one end of the start motor M and a fixed contact 54b.
_{1 to} 54b ₆ are each signal system circuit (indicated by the display lamp L ₁
With connecting one end of ~L indicated by _6), the 54b2 in addition to the signal system circuit, is connected to one end of the back lamps Lb.

Thus, in the automatic transmission control switch, the movable body 60 is integrally rotated in response to the rotation operation of the shift lever, and the movable contacts 63A and 63B are between the corresponding fixed contacts. on and off the display lamp L ₁ ~L ₆ outputs a position signal to the signal system circuit as switching output by contact and separable to or, on and off the current path to start the motor M, also the backlight Lb can be turned on and off.

[0010]

[Patent Document 1] Japanese Patent Laid-Open No. 3-249461

[0011]

In the conventional automatic transmission control switch described above, and in the conventional example described above, the fixed contacts 54a are inserted into the base 51b as shown in FIG. Since the surface is the same as the surface of the base 51b and the contact tip surface of the movable contact 63 is slidably moved to open / close, the open / close arc causes insulation deterioration (carbonization) of the resin when the reverse circuit is opened / closed.
As a result, the above-mentioned short circuit between electrodes is likely to occur, and when the movable contact 63 moves along the boundary, it causes chattering, which causes electrical noise, which may cause a malfunction of a signal system circuit (for example, a microcomputer). Or open / close arc AR
There is also a problem of increasing resin deterioration and further promoting contact wear. In addition, the movable contact 63A on the base 51b,
When the contact tip surface of 63B slides, the abrasion powder of the resin generated by the sliding causes the fixed contacts 54a ... And the movable contacts 63A, 63.
It adhered to B and caused contact failure. Further, when the fixed contacts 54a ... Are inserted in the difference, the position of the boundary portion varies due to the relationship of the insert mold, or the resin molding burrs are generated on the side portions of the fixed contacts 54a. There was also a problem.

Further, since the movable contacts 63A and 63B are biased by springs and rattling is provided inside the contact holder 62, the movable contact 6 depends on the rotating direction of the movable body 60.
3A (or 63B) is tilted as shown by the chain double-dashed line in FIG. 16, so that the contact / separation position is displaced and has hysteresis, which causes a problem of unstable operation.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a control switch for an automatic transmission, which can make the contact / separation position of a movable contact highly accurate. Especially.

[0014]

In order to achieve the above object, the invention according to claim 1 is provided with a movable body that rotates in the housing in response to a switching operation of a shift lever of an automatic transmission,
The movable contact is integrally attached to the movable body, and a fixed contact that comes into contact with and separates from the movable contact according to the rotation of the movable body is formed in the housing.
In an automatic transmission control switch that takes out a position signal that indicates the shift position of the automatic transmission according to opening and closing, each fixed contact is exposed on the inner wall surface of the resin base that forms the housing with the cover and The sliding contact surface is made higher than the inner wall surface of the base, and arc-shaped ribs are formed to project on the inner wall surface of the base on the circumference located between the fixed contacts arranged in parallel so as to be opened and closed by the same movable contact. The position of the rib end face is made to substantially coincide with the position connecting the end faces of both fixed contacts, and the height of the rib from the inner wall surface of the base is made higher than the height of the fixed contact from the inner wall surface of the base, and The end surface is a rounded surface, and each movable contact is spring-biased toward the fixed contact so that it can move in the direction perpendicular to the surface of the fixed contact, and the movable contact rides on the rib. And said that the content was.

The invention of claim 2 is characterized in that, in the invention of claim 1, the rounded surface of the end surface of the rib is formed with a radius substantially the same as the height dimension of the rib.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to embodiments. 1 to 8 show an embodiment of the present invention. In this embodiment, a substantially fan-shaped housing 1 assembled by joining a cover 2 made of aluminum die casting and a base 3 made of synthetic resin with a rivet 4 is assembled. And a movable body 10 rotatably housed inside the housing 1.

As shown in FIGS. 5 and 8, the movable body 10 is made of zinc die-cast and has a cylindrical shaft portion 13 at one end and three movable contacts 15 elastically biased outward by a spring 14.
A contact holder 12 made of synthetic resin that holds A, 15B, and 15C is provided, and the contact holder 12 is housed and fixed in a box-shaped housing 11 that is integrally connected to the shaft 13. A movable body 10 is provided on a main part of the housing 1 formed into a substantially fan shape.
The bearing portion 5 for pivotally supporting the shaft portion 13 of the
A tightening nut 6 for fixing the shaft portion 13 to a manual shaft (shown in FIG. 9) 41 is screwed to the tip portion of the shaft portion 13 protruding toward the side. In the figure, 8 is a rubber packing interposed between the cover 2 and the base 3, and 9 is a shaft portion 13.
Is a rubber seal that comes into contact with and seals the bearing portion 5.
Reference numeral 31 denotes a hole for communicating the housing 1 with the atmosphere, which is closed by a resin cap 18 having a communication hole 17, and a filter for passing air and blocking water is internally provided inside.

The base 3, fixed contacts 7a will be described later to one end portion _{1 ..., 7b 1 ..., 7} c 1 ..., 7d, 7e 1 ...
Is formed by insert-molding a plurality of conductors 7 ... In which the base side portion of the bearing portion 5 and the connector portion 20 are formed by secondary molding. Each fixed contact 7a ₁ ..., 7
b ₁ ..., 7 c ₁ ..., 7 d, 7 e ₁ ... are arranged on five circles having different diameters with the bearing portion 5 as a center, and the movable body 10 is movable in the housing 1. Along with this, the movable contact 15A in the contact holder 14 moves along both circumferences so as to straddle over the innermost first circumference and the adjacent second circumference. Contact 15C is the outermost third
Of the movable contact point 15B and the movable contact point 15B.
Is on the fifth circle between the fourth circle and the second circle and the fourth circle
It is designed to move across the circumference of.

The fixed contacts 7a _1, ..., 7b ₁ are formed on the inner bottom surface of the connector portion 20 which is surrounded by the peripheral wall 21 and is formed in a cylindrical shape.
, 7 c ₁ ..., 7 d, 7 e ₁ ...
The tips of ... are projected in two rows to form the connector terminals 16. An outer flange portion (flange portion) 22 is provided on the outer peripheral surface of the housing 1 at the base of the connector portion 20. As shown in FIG. 6, the outer collar portion 22 has a housing 1
Is formed to have a width dimension larger than the thickness. Further, as shown in FIGS. 4 to 6, a plurality of reinforcing ribs 23 are arranged in a row along the longitudinal direction of the outer collar portion 22 on the bottom surface (the surface on the bearing portion 5 side) of the outer collar portion 22, By providing the plurality of ribs 23, the thickness of the outer flange portion 22 can be reduced while ensuring sufficient strength, and the overall size of the housing 1 can be reduced.

The housing 1 is provided with a screw insertion hole 19 into which a mounting screw for mounting on a vehicle body (or automatic transmission ATM) is inserted. The normal direction of the opening surface of the connector portion 20 (the direction of (a) in FIG. 7) is fixed from the normal direction of the bottom surface of the vehicle (the direction of (b) in the same figure) in a state where the housing 1 is attached to the regular mounting position of the vehicle body. Angle θ (θ
The connector portion 20 is provided so as to be inclined by 30 ° to 60 °.

Now, the fixed contacts 7a ₁ ..., 7b ₁ ..., 7
c ₁ ..., 7d, 7e ₁ ... is Ro設as the contact surface is positioned higher than the surface of the base 3, fixed contacts 7a ₁ which is disposed on the first circumference movable member 10 The movable contact 5A of the movable body 10 is exposed at the position of the base 3 which can be contacted when it is rotated to the parking position (P).
It is connected to the non-grounded side electrode of the vehicle-mounted battery, for example, the + electrode, via the starter side contact of the ignition key switch. Similarly, fixed contacts 7a arranged on the first circumference
₂ is provided on the same conductive plate 7 as the fixed contact 7a ₁ and is exposed at the position of the base 3 to which the movable contact 5A of the movable body 10 can come in contact when the movable body 10 is rotated to the neutral position (N). .

Fixed contacts 7 arranged on the second circumference
b ₁ and 7b ₂ are fixed contact 7 by the movable contact 5A.
intended to turn on and off between a _1, 7a _2, fixed contacts 7b ₁ are movable member 10 is a parking position (P) to pivot to a movable contact 5A of the movable member 10 is a base 3 that can contact when It is exposed to the position, and the positions of both end faces thereof are set to the same rotation angle as the positions of both end faces of the fixed contact 7a ₁ .
Further, the fixed contact 7b ₂ is provided on the same conductive plate 7 as the fixed contact 7b _1, and when the movable body 10 is rotated to the neutral position (N), the movable contact 5A of the movable body 10 is exposed to the position of the base 3. The fixed contact 7a ₁ is provided with both ends thereof at the same rotation angle as the positions of both ends of the fixed contact 7a ₁ .
Both fixed contacts 7b ₁ and 7b ₂ are connected to one end of the start motor.

On a fifth circumference that is adjacent to the second circumference on the outside.
Fixed contact 7c₁~ 7c ₃And on the fifth circle
Fixed contact 7d arranged on the fourth circumference that is adjacent to the outside
Is turned on and off by the movable contact 5B of the movable body 10.
Fixed contact 7c₁Is the movable body 10
Movable contact of the movable body 10 when rotated to the position (P)
5B is exposed at the position of the base 3 where it can come into contact, and fixed contacts
7c₂The movable body 10 to the neutral position (N)
The movable contact 5B of the movable body 10 can be contacted when the movable body 10 is rotated.
The fixed contact 7c is exposed at the position of the base 3₃Is the movable body 10
Of the movable body 10 when the vehicle rotates to the second speed position (2)
The moving contact 5B is exposed at the position of the base 3 which can be contacted.
Each fixed contact 7c₁~ 7c₃Are different conductors 7
Connected to one end of the corresponding signal system circuit.
Be done.

The fixed contacts 7e _{1 to} 7e ₃ arranged on the outermost _third circumference are fixed to the movable contact 10 between the fixed contacts 7e _{1 to} 7e ₃ arranged on the fourth circumference. Moving contact 5
It is turned on / off by C, and the fixed contact 7e ₁ is exposed at the position of the base 3 to which the movable contact 5C of the movable body 10 can contact when the movable body 10 is rotated to the reverse position (R). The fixed contact 7e ₂ is the movable contact 5 of the movable body 10 when the movable body 10 is rotated to the drive position (D).
B is exposed at a position of the base 3 which can be contacted with the fixed contact 7
e ₃ is exposed at a position of the base 3 where the movable contact 5B of the movable body 10 can contact when the movable body 10 is rotated to the first speed position (L), and the fixed contacts 7e _{1 to} 7e ₃ are They are formed on different conductive plates 7 and are connected to one end of the signal system circuit corresponding to each. The conductive plate 7 corresponding to the fixed contact 7e ₁ is also connected to one end of the back lamp.

Then, the fixed contact 7d arranged in the fourth position.
Is a common fixed contact, and the length is set so that the movable contacts 5B and 5A can contact each other when the movable body 10 moves in the range from the parking position (P) to the first speed position (L). 3, the fixed contact 7d
The conductive plate 7 formed with is connected to the + electrode of the vehicle-mounted battery through a contact that is turned on after the ignition key switch is started.

Further, the position of the end surface of the fixed contact 7d on the parking position (P) side and the position of the outer end surface of the fixed contact 7c ₁ are set to the same rotation angle.
Position of the end face on the 1st speed position (L) side of d and the fixed contact 7
The position of the outer end surface of e ₃ is set to the same rotation angle. Here, the base 3 between the circumference where the fixed contacts 7a ₁ ... are arranged and the circumference where the fixed contacts 7b ₁ ... are arranged has the same rotation as the outer end face of the fixed contacts 7a ₁ , 7b _1. has an end face of the dynamic angle, the arcuate rib 32 ₁ that extends opposite to the fixed contacts 7a _1, 7b ₁ side, at one end an end face of the same rotation angle and the inner end surface of the fixed contacts 7a _1, 7b ₁ An arcuate rib 32 ₂ having an end face having the same rotation angle as the outer end faces of the fixed contacts 7a ₂ and 7b _{2 on} the other end, and the fixed contacts 7a ₂ and 7
Have an end face with the same rotation angle as the outer end face of b ₂ at one end,
A rib 32 ₃ extending toward the non-fixed contacts 7a ₂ and 7b ₂ is integrally projected.

Fixed contact 7c₁The circumference where ... is placed
To the base 3 between the fixed contact 7d and the circumference where the fixed contact 7d is arranged.
Is the fixed contact 7c₁The same rotation angle as the outer end face of 7d
Anti-fixing contact 7c₁, Extended to the 7d side
Arc-shaped rib 32_FourAnd fixed contact 7c₁Same as the inner end face of
It has an end face with one rotation angle at one end and a fixed contact 7c at the other end.
₂Fixed contact 7c₁Hold the end face with the same rotation angle as the side end face.
Rib 32_FiveAnd fixed contact 7c₂Fixed contact 7
c₃One end has an end face with the same rotation angle as the side end face, and the other end
Fixed contact 7c₃Fixed contact 7c₂Same rotation as the side end face
Arc-shaped rib 32 having an angled end surface₆And fixed contact 7c
₃Has an end face with the same rotation angle as the outer end face of the
Point 7c₃Arc-shaped rib 32 extending toward the side₇And one
It is set up.

Fixed contact 7e₁The circumference where ... is placed
To the base 3 between the fixed contact 7d and the circumference where the fixed contact 7d is arranged.
Is the fixed contact 7e₁End face with the same rotation angle as the outer end face of
With fixed contact 7e₁Arc-shaped rib extending to the side
32₈And fixed contact 7e₁Fixed contact 7e₂Same as side edge
It has an end face with one rotation angle at one end and a fixed contact 7e at the other end.
₂Fixed contact 7e₁Hold the end face with the same rotation angle as the side end face.
Rib 32₉And fixed contact 7e₂Fixed contact 7
e₃One end has an end face with the same rotation angle as the side end face, and the other end
Fixed contact 7e₃ Fixed contact 7e₂Same rotation as the side end face
Arc-shaped rib 32 having an angled end surface_TenAnd fixed contact 7e
₃Has an end face with the same rotation angle as the outer end face of the
Point 7e₃Arc-shaped rib 32 extending toward the side₁₁Integrated with
I am doing it.

The relationship between these ribs 32 ₁ and fixed contacts 7a is shown in FIGS. As shown in the figure, the height A of the rib 32 is formed higher than the height B of the fixed contact 7, and the end face of the fixed contact 7 on the end face side is a rounded face 32A, and the radius R of the rounded face 32A is the height A. As described above, in the embodiment, the height is set to be substantially the same as the height A. An air gap G is provided between the side surface of the end of the rib 32 and the corresponding side surface of the fixed contact 7 of the rib 32.

Thus, in the automatic transmission control switch, the movable body 10 is integrally rotated in response to the rotation operation of the shift lever, and the movable contacts 15A to 15C are provided between the corresponding fixed contacts. The position signal is output as a switching output to the signal system circuit by turning on and off, turning on and off the display lamp, turning on and off the energizing path to the start motor, and turning on and off the backlight.

When the movable contact 15 is separated from the fixed contact 7, the tip of the tip of the movable contact 15 having a semicircular cross section is fixed while sliding on the fixed contact 7, as shown in FIG. When the movable contact 15 moves near the end surface of the contact 7, the front surface of the movable contact 15 positioned slightly above the tip in the traveling direction hits the rounded surface 32A of the rib 32, and the movable contact 15 has the spring 14 attached. It will ride on the rib 32 against the force. By this riding, the tip of the movable contact 15 is separated from the fixed contact 7, and the movable contact 15 slides on the rib 32.

On the other hand, when the movable contact 15 comes into contact with the fixed contact 7, when the movable contact 15 comes to the end of the rib 32 while sliding on the rib 32, the tip of the movable contact 15 is biased by the spring 14 and the rounded surface 32A. It will descend onto the fixed contact 7 while sliding on. After that, the tip of the movable contact 15 comes into contact with the fixed contact 7, and the movement of the movable contact 15 causes the tip of the movable contact 15 to slide on the fixed contact 7.

Here, the tip of the movable contact 15 comes into contact with the rounded surface 32A of the rib 32 to start riding and the tip is separated from the fixed contact 7, and the tip of the movable contact 15 is rounded with the rib 32. The position where the tip comes in contact with the fixed contact 7 while descending while contacting the surface 32A is the rounded surface 32 of the rib 32.
The position is the same as defined by A, and conventional hysterisis does not occur. Moreover, the rounded surface 32A of the rib 32 hardly wears the tip of the movable contact 15, so that the contact / separation position hardly changes with time and stable operation can be obtained, and the life can be extended.

Further, in the case of the fixed contacts 7e ₁ and 7d for turning on / off the energization of the backlight, even if an opening / closing arc occurs between the movable contact 15C and the movable contact 15C, the air gap G between the rib 32 ₈ causes the rib without affecting the 32 _8, it becomes possible to prevent the occurrence of insulation deterioration such as to prevent carbonization of the ribs 32 _8.

[0035]

According to the invention of claim 1, in the automatic transmission control switch configured as described above, each fixed contact is exposed on the inner wall surface of the resin base forming the housing together with the cover, and each fixed contact. The sliding contact surface of is higher than the inner wall surface of the base, and an arcuate rib is formed protruding on the inner wall surface of the base on the circumference located between the fixed contacts arranged in parallel so as to be opened and closed by the same movable contact. ,
The position of the rib end face is made to substantially coincide with the position connecting the end faces of both fixed contacts, and the height of the rib from the inner wall surface of the base is made higher than the height of the fixed contact from the inner wall surface of the base, and The end face is a rounded surface, and each movable contact is spring-biased toward the fixed contact so that it can move in the direction perpendicular to the surface of the fixed contact, and it can ride on the ribs, so that the wear of the movable contact does not occur. The number of positions where the movable contact is separated from the fixed contact can be set with high accuracy by the molding die accuracy, compared with the case where the fixed contact is inserted into the base and the base surface and the fixed contact surface are flush with each other. Since the upper opening / closing arc hardly affects the ribs, there is little change in the contact / separation position between the movable contact and the fixed contact, making stable contact / separation possible and extending the service life. It is also inclined by the movable contact slide being further biased spring, without contact and separable position is changed by the sliding direction, there is an effect that therefore hysteresis is not generated.

According to the second aspect of the present invention, since the rounded surface of the end surface of the rib is formed with a radius substantially the same as the height dimension of the rib, the dimension of the rounded surface is set so that the switching position can be obtained with high accuracy. The height can be used as a reference for the determination, and there is an effect that the rounded surface can be easily manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part of the above.

FIG. 3 is a front view of the above cover.

FIG. 4 is a front view of the above.

FIG. 5 is a side sectional view of the above.

FIG. 6 is a side view showing a state of attachment to the above automatic transmission.

FIG. 7 is a rear view of the above.

FIG. 8 is a rear view of the above movable body.

9A and 9B are views showing a conventional example and conceptually showing a state of being attached to an automobile, in which FIG. 9A is a bottom view and FIG. 9B is a side view.

FIG. 10 is a front view of the above.

FIG. 11 is a side sectional view of the above.

FIG. 12 is a side view showing a state of attachment to the above automatic transmission.

FIG. 13 is a front view of the above base.

FIG. 14 is a conceptual electrical connection diagram of the above.

FIG. 15 is an explanatory diagram of the above problem.

FIG. 16 is an explanatory diagram of the above problem.

[Explanation of symbols]

3 base 7 fixed contact 10 movable body 15 movable contact 32 Rib 32A Rounded surface R Radius G Air gap A, B Height

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomohiro Uchida             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 3J552 MA01 NA01 PA53 QC10 VA62W                 5G019 AA03 AF33 AG13 AM31 CX12                       SK01 SY01                 5G051 JA21 JA27 JA32

Claims (2)

[Claims] 1. A movable body that rotates in a housing in response to a switching operation of a shift lever of an automatic transmission, a movable contact is integrally attached to the movable body, and the movable contact corresponds to rotation of the movable body. In the control switch for an automatic transmission, a fixed contact that comes into contact with and separates from the housing is formed in the housing, and a position signal indicating a shift position of the automatic transmission according to the contact and opening between the movable contact and the fixed contact is taken out. Each fixed contact is exposed on the inner wall surface of the resin base that forms the cover together with the sliding contact surface of each fixed contact higher than the inner wall surface of the base, and they are arranged in parallel so that they can be opened and closed by the same movable contact. An arcuate rib is formed on the inner wall surface of the base on the circumference located between the fixed contacts, and the position of the rib end face is substantially the same as the position connecting the end faces of both fixed contacts. In addition, the height of the rib from the inner wall surface of the base is made higher than the height of the fixed contact from the inner wall surface of the base, and the end face of the rib is a rounded surface, and each movable contact is relative to the surface of the fixed contact. A control switch for an automatic transmission, characterized in that it is spring-biased in the direction of a fixed contact so as to be movable in the vertical direction, and is freely mounted on the rib. 2. The control switch for an automatic transmission according to claim 1, wherein the rounded surface of the end surface of the rib is formed with a radius substantially the same as the height dimension of the rib.