JPH05119047A - Detector of input rotation of automatic transmission gear - Google Patents

Abstract

PURPOSE:To always enable the detection of a planetary gear input rotation of an automatic transmission gear without incurring an increase in axial dimensions. CONSTITUTION:A sensor rotor 9 is mounted on the outer circumstance of a carrier of a planetary gear P and the outer diameter side of the sensor rotor 9 is led out to the outer circumference of the planetary gear P through a clearance between a clutch 7 and a ring gear 6 to be opposed to a sensor pickup 10 mounted on a case 3. The rotation of the sensor rotor 9 mounted on the carrier 2 is detected with the sensor pickup 10 on the outer circumference of the planetary gear P. As a result, an input rotation of a planetary gear transmission gear is always detected regardless of the fixing or releasing of a sungear 4 with a brake 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission, and more particularly to an input rotation detecting device for detecting the input rotation of the automatic transmission.

[0002]

2. Description of the Related Art In an automatic transmission, it is necessary to detect input rotation for lock-up control, gear change control and the like. Conventionally, as a means for detecting the input rotation, there is one that welds and fixes a sensor rotor to a drum of a brake that engages and disengages a sun gear with a case in an overdrive portion and detects the rotation. Also, as another means, the actual exploitation 6
As disclosed in Japanese Unexamined Patent Publication No. 0-74057, there is also a sensor rotor provided between the oil pump and the overdrive portion by spline coupling to the input shaft of the overdrive portion. As another means, as disclosed in Japanese Utility Model Laid-Open No. 62-71566, a sensor is inserted in an oil pump, and rotation is detected by using a spline tooth provided on an input shaft as a sensor rotor.

[0003]

However, in the case where the sensor rotor is attached to the brake drum,
Although it has the advantage that detection can be performed with a small ring-shaped component without increasing the axial dimension of the automatic transmission, the sun gear is fixed to the case by the brake during overdrive operation. There is a constraint that cannot be detected.

On the other hand, in the case where the sensor rotor is directly spline-coupled to the input shaft, there is an advantage that the rotation can always be detected regardless of whether the overdrive is operating or not.
The sensor rotor becomes a large member that extends directly to the shaft, and an axial space for inserting the sensor rotor is required between the oil pump and the overdrive part. Furthermore, the sensor rotor is interposed in the portion that receives the thrust of the sun gear consisting of a helical gear. Therefore, it is necessary to add a bearing, and there is a problem that the axial space, the number of parts, and the weight increase correspondingly.

Further, in the case where the spline teeth of the input shaft are used as the sensor rotor, there is a problem that the detection accuracy is not good because the tooth profile cannot be increased because the diameter of the rotating portion is small and the number of teeth is limited.

In view of such circumstances, the present invention is capable of constantly detecting the planetary gear input rotation of the automatic transmission,
It is an object of the present invention to provide an input rotation detection device that can suppress the increase in the number of parts and the weight, and can maintain a sufficient detection accuracy without increasing the size in the axial direction.

[0007]

In order to solve the above problems, an input rotation detecting device of the present invention is connected to a carrier connected to an input shaft, a sun gear engaged with the case, and an output shaft. A planetary gear having a ring gear, a clutch connecting the carrier to the sun gear, and a brake engaging the sun gear with the case, wherein the clutch is arranged on the input side of the planetary gear. , A sensor rotor is attached to an outer peripheral portion of the carrier, and an outer diameter side of the sensor rotor is led to an outer periphery of a planetary gear through a gap between the clutch and the ring gear so as to face a sensor pickup attached to the case. And

[0008]

In the input rotation detecting device according to the present invention having such a structure, the rotation of the sensor rotor mounted on the carrier is detected by the sensor pickup on the outer periphery of the planetary gear, and as a result, the planetary gear transmission is operated. Input rotation is always detected regardless of whether the sun gear is fixed or released by the brake.

According to the present invention, the sensor rotor is attached to the outer periphery of the carrier, so that the carrier is used as a connecting member to the input shaft, and the inner diameter side member of the sensor rotor is reduced. The rotor can be made smaller and lighter. Further, since the outer diameter side of the sensor rotor is led out to the outer periphery of the planetary gear through the gap between the clutch and the ring gear, which is an opening to the outer periphery of the planetary gear transmission, the shaft of the planetary gear transmission is added by adding the sensor rotor. There is no increase in the directional dimension.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial side sectional view showing an input rotation detecting device arrangement portion of an automatic transmission to which the present invention is applied, and FIG. 2 is a front view showing a state in which a sensor rotor of the input rotation detecting device is attached to a carrier of a planetary gear. 3 is III-II in FIG.
It is a sectional view taken on the line I. In this example, the input rotation detection device is
It is arranged in the overdrive portion of a five-speed transmission in which a main transmission composed of a simple-coupling three-planetary gear train and a front-mounted overdrive planetary gear are combined.

The overdrive portion includes a carrier 2 connected to an input shaft 1 to which turbine rotation of the torque converter is input, a sun gear 4 engaged with a case 3 of the transmission,
A planetary gear P having a ring gear 6 connected to an output shaft 5 connected to a main transmission composed of a simple connection 3 planetary gear train, a clutch 7 connecting the carrier 2 to the sun gear 4, and a brake 8 engaging the sun gear 4 to the case 3. And the clutch 7 is a planetary gear transmission in which the clutch 7 is arranged on the input side of the planetary gear P. In such a transmission, since a gap is formed over the entire circumference between the clutch 7 and the ring gear 6, the sensor unit is
The sensor rotor 9 is attached to the outer peripheral portion of the carrier 2, and the planetary gear P is passed through the gap on the outer diameter side of the sensor rotor 9.
Of the sensor pickup 10 fixed to the case 3 so as to face the sensor pickup 10.

Further, in detail about the configuration of each part,
The carrier 2 is connected to a radial flange 11 formed integrally with the rear end of the input shaft 1 connected to the turbine of the torque converter T and the lockup clutch. Carrier 2
The member constituting is configured such that arm piece portions 22 projecting radially from four outer circumferences of a disk portion 21 made of a thick plate are bent at right angles at the outer circumference portion, and the end portions of the arm piece portions 22 are respectively It is welded and fixed to the outer peripheral portion of the radial flange 11. Each of the radial flange 11 and the disc portion 21 of the carrier member is provided with four holes 12 and 23 aligned with each other, and the support shaft of the pinion gear is supported in these holes.

The sun gear 4 is fitted around the input shaft 1,
An inner race F1 of the one-way clutch F is integrally formed at the front end thereof, and the inner circumference of the inner race F1 is supported by the input shaft 1 via a bearing 13. The bearing arrangement avoiding the inner circumference of the sun gear 4 is the planetary gear P.
The effect that the outer diameter of the sensor rotor 9 is reduced without changing the gear ratio of the sensor rotor 9 is increased. Is useful for. Ring gear 6
Is connected to the output shaft 5 by an outer peripheral tooth meshing with the inner peripheral tooth and a ring gear flange 61 fitted to the output shaft 5 by an inner peripheral spline.

The inner annular member 71 forming the hub of the clutch 7 is provided with a spline on its outer circumference for supporting the frictional engagement element slidably in the axial direction, and on the inner circumference thereof is a one-way clutch F.
It has a spline that meshes with the outer race F2 of
The notch at the rear end is provided between the arm piece 22 and the disc 21
It is welded and fixed to the outer circumference.

As shown in FIG. 3, the sensor rotor 9 has a conical flange portion 92 that is inclined rearward from the radial flange portion 91 on the inner diameter side toward the outer radial direction, and a circumferential flange portion that is bent and extends forward. 93, and an axial slit 94 for pulse counting by the sensor pickup 10 is formed at a front end of the circumferential flange portion 93 at a predetermined pitch along the circumference. The sensor rotor 9 is attached to the inner annular member 71 by spot welding at a position on the outer peripheral side of the arm piece 22 by bringing the reduced diameter portion 95 formed on the inner peripheral side thereof into contact with the rear end surface of the inner annular member 71. ing. On the other hand, the sensor pickup 10 is attached to the transmission case 3, and its sensing portion 10a is provided in a protruding manner in the case 3 by utilizing a space formed by moving the friction engagement element of the brake 8 forward. Has been done.

The outer annular member 81, which also serves as the drum of the clutch 7 and the hub of the brake 8, has a spline for axially slidably supporting a friction engagement element on its inner and outer circumferences, and connects the servo cylinder 72 of the clutch 7. As a member, it is connected to the inner race F1 of the one-way clutch F. A servo piston 82 of the brake 8 is provided on the outer diameter side of a center support S provided behind the planetary gear P, and an annular operation that extends forward on the outer diameter side and faces the friction engagement element. The member 83 extends to the outer peripheral side of the sensor rotor 9 and covers the sensor rotor 9, but the sensor pickup 10 arrangement portion is cut out to directly connect the sensing portion 10a of the sensor pickup 10 and the axial slit 94. The opposite is allowed.

In the input rotation detecting device constructed as described above, the turbine rotation of the torque converter T is caused by the carrier 2.
When the sun gear / carrier is directly connected by releasing the brake 8 and engaging the clutch 7, the rotation of the carrier 2 is always detected by the sensor rotor 9 regardless of the overdrive state by engaging the brake 8 and releasing the clutch 7. Can be detected with a sufficiently large diameter portion, and the input rotation can always be detected with high accuracy.

According to the input rotation detecting device of the above embodiment,
Since the conical flange portion 92 is formed on the sensor rotor 9 to avoid the interference with the rear end of the outer annular member 81, the effect that the forward movement of the outer annular member 81 for securing the gap is unnecessary can be obtained. There is. Further, since the transfer of the frictional engagement element of the brake 8 to the front side is originally the movement to the dead space side formed with the oil pump, it does not result in a significant increase in the axial dimension. Further, since the sensing portion 10a of the sensor pickup 10 is opposed to the axial slit 94 of the sensor rotor 9 by utilizing the return spring arrangement portion where the operation member 83 is originally cut, the brake servo side is particularly affected. Not even.

Although the present invention has been described above in detail based on an embodiment in which it is applied to an overdrive portion of a 5-speed automatic transmission, the object of application of the present invention and the specific detailed structure are not limited to the above. Various configurations can be adopted within the scope described in the claims.

[Brief description of drawings]

FIG. 1 is a partial side sectional view showing an input rotation detection device installation portion of an automatic transmission to which the present invention is applied.

FIG. 2 is a front view showing a state in which a sensor rotor of the input rotation detection device is attached to a carrier of a planetary gear.

3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 1 Input Shaft 2 Carrier 3 Case 4 Sun Gear 5 Output Shaft 6 Ring Gear 7 Clutch 8 Brake 9 Sensor Rotor 10 Sensor Pickup P Planetary Gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Sumiya, 10 Takane, Fujii-cho, Anjo-shi, Aichi Prefecture Aisin A-Daburi Co., Ltd. (72) Kazuma Tsukamoto, 10 Takane, Fujii-cho, Anjo-shi, Aichi N.A.Daburi Co., Ltd.

Claims (1)

[Claims] 1. A planetary gear having a carrier connected to an input shaft, a sun gear engaged with a case, and a ring gear connected to an output shaft, a clutch connecting the carrier to the sun gear, and the sun gear. A planetary gear transmission having a brake that engages with the case, wherein the clutch is disposed on the input side of the planetary gear, and a sensor rotor is attached to an outer peripheral portion of the carrier, and an outer diameter side of the sensor rotor is attached to the clutch. And an input rotation detecting device for an automatic transmission, which is led out to the outer periphery of the planetary gear through a gap between the ring gear and the ring gear and is opposed to a sensor pickup attached to the case.