JP2001173761A - Sensor structure of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a need for variation of the internal part of an automatic transmission since a rotation sensor is mounted and to reduce an overall length and size, in the sensor structure of the automatic transmission. SOLUTION: A rotation sensor to detect rotation of an input shaft is situated at a transmission case at a portion corresponding to a direct clutch drum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor structure of an automatic transmission, and more particularly to a sensor structure of an automatic transmission that detects rotation of an input shaft so as to confirm each gear position.

[0002]

2. Description of the Related Art A power transmission device for a vehicle includes a transmission, a differential, and the like in order to appropriately transmit the driving force of an engine to wheels according to a traveling state. BACKGROUND ART As a transmission, there is an automatic transmission that automatically performs a shift operation according to a traveling state of a vehicle.

As shown in FIG. 5, for example, in a three-speed automatic transmission 202, an engine crankshaft (not shown) is used.
Long input shaft 2 supported by the end portion of the shaft and the transmission case 204
06, and a torque converter 208 is provided between one end of the
An auxiliary shaft 210 is spline-coupled coaxially to the other end of the input shaft 206 and supported by a side case 212. The auxiliary shaft 210 and the input shaft 206 serve as a planetary gear unit constituting an auxiliary transmission mechanism. , Front and rear planetary gear units 214 and 216, and the front and rear planetary gear units 21
4 and 216, a forward clutch 218, a one-way clutch 220, and a first reverse brake 222 are provided.
Input shaft 206 and rear planetary gear unit 216 at high speed
The direct clutch drum 2 fixed to the rear sun gear 224 so as to connect with the rear sun gear 224
The direct clutch 228 provided with the direct clutch drum 226 is provided on the side case 212 side.
A second-speed brake band 230 is provided on the outer peripheral surface of the motor, and an output shaft 232 is provided on the input shaft 206 by loose fitting. A reduction driven gear 238 meshing with the reduction drive gear 234 and a reduction driven gear 23 are provided on the counter shaft 236.
A differential drive gear 240 is provided adjacent to the differential gear 8 and the differential case 2 of the differential 242 is provided on the differential drive gear 240.
A differential driven gear 246 fixed to 44 is engaged. Also, the input shaft 2 is controlled so as to confirm each gear position.
A rotation sensor 248 is attached to the side case 212 in order to detect the rotation of the auxiliary shaft 210 as the rotation of 06. The reason why the rotation sensor 248 is attached in this manner is that when it is determined whether or not the automatic transmission 202 is shifting gears as instructed by the control means, the rotation of the input shaft 206 / the rotation of the output shaft 232 and the number of gear stages are determined. The gear ratio is compared with the gear ratio. During normal running, the engine speed /
It can be estimated from the differential output rotation speed, but when the slip amount of the torque converter 208 is large during acceleration running, uphill running, etc., it is difficult to make the determination. This is because it is necessary to dispose the rotation sensor 248 at the subsequent stage.

As shown in FIG. 6, in a three-speed automatic transmission 302, for example, a torque is applied between an engine crankshaft (not shown) and an input shaft 306 supported by a transmission case 304. A converter 308 is provided, and the transmission case 304 and the side case 310 are coaxial with the input shaft 306.
An output shaft 312 is provided to support the output shaft 312. The output shaft 312 includes front and rear planetary gear units 314 as planetary gear units constituting an auxiliary transmission mechanism.
316 is provided so as to be loosely fitted, and the front and rear planetary gear units 314 and 316 perform shifting.
Forward clutch 318 and one-way clutch 320
And a first reverse brake 322,
The direct clutch drum 326 fixed to the sun gear 324 so as to connect the input shaft 306 and the sun gear 324 of the front planetary gear unit 314 and the rear planetary gear unit 316 at the third speed as the specific speed.
Is provided, a second-speed brake band 330 is provided on the outer peripheral surface of the direct clutch drum 326, a reduction drive gear 332 is provided on the output shaft 312, and the counter is set in parallel with the input shaft 306 and the output shaft 312. A shaft 334 is supported by the transmission case 304, and a reduction driven gear 336 that meshes with the reduction drive gear 332 is provided at one end of the counter shaft 334, and a differential drive gear 338 is provided at the other end of the counter shaft 334. The differential drive gear 338 meshes with a differential driven gear 344 fixed to a differential case 342 of the differential unit 340. In this case, in the case where a rotation sensor 346 for detecting the rotation of the input shaft 306 is provided so as to confirm each gear position, FIG.
As shown in the figure, the case wall 348 and the direct clutch 3
A detection portion 350 having a length L is formed on the input shaft 306 between the transmission shaft 28 and the transmission case 304 and a rotation sensor 346 is attached to a portion corresponding to the detection portion 350.

Further, as such an automatic transmission, for example, Japanese Patent Application Laid-Open No. 9-79366 and Japanese Patent Application Laid-Open
No. 155. JP-A-9-79366
Japanese Patent Application Laid-Open Publication No. H11-15064 discloses an input sensor that detects rotation of an input shaft and an output sensor that detects rotation of an output shaft. The load torque is determined based on a signal from the input sensor and a signal from the output sensor. Is detected and calculated. Japanese Unexamined Patent Application Publication No. 8-145155 discloses a device provided with a sensor for detecting the rotation speed of a turbine of a torque converter as the rotation speed of an output shaft.

[0006]

However, conventionally, FIG.
In the automatic transmission shown in (1), the rotation sensor is attached to the part corresponding to the input shaft detection part, so it is necessary to significantly change the internal structure to widen the space between the case wall and the direct clutch. In addition, there is a disadvantage that the overall length becomes large and the size becomes large.

[0007]

Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a torque converter between an engine crankshaft and an input shaft supported by a transmission case. An output shaft is supported on the transmission case on the same axis as the transmission case, a planetary gear unit is provided on the output shaft, and a direct clutch fixed to at least the sun gear of the planetary gear unit as a clutch so that the planetary gear unit can perform shifting. In a sensor structure of an automatic transmission provided with a direct clutch provided with a clutch drum and detecting rotation of the input shaft so as to confirm each gear position, a rotation sensor for detecting rotation of the input shaft is provided by the direct clutch. The transmission case is provided at a portion corresponding to a drum.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a rotation sensor for detecting rotation of an input shaft is provided in a transmission case at a portion corresponding to a direct clutch drum. Since rotation can be detected, it is not necessary to change the inside of the automatic transmission to install a rotation sensor, and the overall length is reduced,
The size can be reduced.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 3 show a first embodiment of the present invention. 1 and 2, reference numeral 4 denotes an engine mounted on a vehicle (not shown), reference numeral 4 denotes, for example, a three-speed automatic transmission, reference numeral 6 denotes a differential, and reference numeral 8 denotes a transmission case. The transmission case 8 includes a converter case 10 on the engine 2 side and a gear case 12 connected to the converter case 10.
Consists of A side case 14 is attached to the gear case 12.

In the transmission case 8, an input shaft 16 and an output shaft 18 are supported and supported coaxially with a crankshaft (not shown) of the engine 2.

A torque converter 20 is provided in the converter case 10 between the crankshaft of the engine 2 and the input shaft 16. This torque converter 20
Has a pump blade 24 attached to a drive plate 22 fixed to a crankshaft, a turbine blade 26 attached to the input shaft 16, and a stator 28. The stator 28 is attached via a one-way clutch 34 to a fixed shaft 32 connected to a case wall 30 of the transmission case 8. The drive plate 22 is provided with an oil pump 38 via a pump shaft 36. The oil pump 38 is configured by a pump case 42 attached to the case wall 30 with an attachment bolt 40.

The gear case 12 has an output shaft 18
A front planetary unit 44 and a rear planetary unit 46 are provided as planetary gear units so as to constitute an auxiliary transmission mechanism, and a forward clutch 48 and a one-way clutch 50 are provided as clutches.
And a direct clutch 52, a first reverse brake 54 is provided as a brake, and a second speed brake band 56 is provided as a brake band.

In the front planetary unit 44 and the rear planetary unit 46, a sun gear 58 rotatably provided on the output shaft 18 is commonly used. The front planetary unit 44 includes a sun gear 5
8 has a front planetary gear 60 meshing with one end side, a front internal gear 62 meshing with the front planetary gear 60, and a front planetary carrier 64 fixed to the output shaft 18 holding the front planetary gear 60. The rear planetary unit 46 includes a rear planetary gear 66 that meshes with the other end of the sun gear 58, a rear internal gear 68 that meshes with the rear planetary gear 66 and is fixed to the output shaft 18, and a rear planetary carrier 7 that holds the rear planetary gear 66.
0.

The forward clutch 48 connects the input shaft 16 and the front internal gear 62, and has a one-side forward plate fixed to the other end of a forward clutch drum 72 having one end fixed to the input shaft 16. 74, and the other side forward plate 76 fixed to the outer peripheral surface of the front internal gear 62 so as to face the one side forward plate 74.

The first reverse brake 54 is connected to the rear planetary unit 46 via a one-way clutch 50 for preventing the rear planetary carrier 70 from rotating in the reverse direction. That is, in the first reverse brake 54, the rear planetary carrier 70 is fixed, the one-way clutch 50 is connected to the rear planetary gear 66, and the one-way clutch 50 is connected to the one-side brake plate 78, so that the one-side brake Plate 7
8 is fixed to the inner surface of the gear case 12.

The direct clutch 52 connects the input shaft 16 and the sun gear 58 at a third speed which is a specific speed. One end of the direct clutch 52 is connected to the sun gear 58 between the front planetary unit 44 and the rear planetary unit 46. , A direct clutch drum 82 whose other end is located near the case wall 30. Further, a one-side direct plate 84 is fixedly provided on the inner peripheral surface of the direct clutch drum 82, and the plate support portion 86 fixed to the forward clutch drum 82 is fixed to the one side plate 86. The other side direct plate 88 facing the direct plate 84 is provided.

The direct clutch drum 82 rotates in accordance with the gear ratio of each gear stage, and can detect the rotation of the input shaft 16. That is, the input shaft 16
Of the direct clutch drum 82
Rotation is 2,129 at 1st gear, 0 at 2nd gear, 1,0 at 3rd gear
Becomes

The second speed brake band 56 operates at the second speed to fix the sun gear 58, and is disposed on the outer peripheral surface of the direct clutch drum 82.

A reduction drive gear 90 is attached to the other end of the output shaft 18.

The transmission case 8 and the side case 14 have a counter shaft 9 parallel to the input shaft 16 and the output shaft 18.
2 are provided to be pivotally supported. The counter shaft 92 is provided at one end with a reduction driven gear 94 that meshes with the reduction drive gear 90 and at the other end with a differential drive gear 96.

The differential drive gear 96 includes a differential 6
A differential driven gear 100 fixed to the differential case 98 is provided in mesh with the differential case 98. An axle shaft 102 is connected to a differential case 98 of the differential 6.

At a substantially central portion of the gear case portion 12 of the transmission case 8, a rotation sensor 104 is attached so as to correspond to the outer peripheral surface of the direct clutch drum 82. The rotation sensor 104 is inserted into a sensor mounting hole 110 formed in a radial direction on a cooler boss 108 of the gear case 12 to which the oil cooler 106 is attached.

On the outer peripheral surface of the direct clutch drum 82, a signal generating marker 112 such as an unevenness or a color pattern is provided at a position corresponding to the rotation sensor 104. The rotation sensor 104 communicates with a control unit (not shown) to detect the rotation of the direct clutch drum 82 as an input rotation, determine a shift gear position, and determine whether a shift is being performed as instructed by the control unit. To judge whether or not the control means performs a functional failure diagnosis.

Next, the operation of the first embodiment will be described.

The direct clutch drum 82 rotates in accordance with the gear ratio of each gear stage, and the rotation of the direct clutch drum 82 is detected by the rotation sensor 104 as the rotation of the input shaft 16. Output signal A of the first speed is A / 2.129 / 1 speed ratio /
When the reduction ratio is equal to the differential output rotation speed and the second speed is A = 0, and the third speed is the A / 3 speed gear ratio / reduction ratio = the differential output rotation speed, the gear is shifted as instructed by the control means. However, in other cases, it is determined that a failure has occurred.

In the first embodiment, the rotation sensor 104 for detecting the rotation of the input shaft 16 is connected to the transmission case 8 at a position corresponding to the direct clutch drum 82.
Since the rotation sensor 104 can detect the rotation of the input shaft 16 even when the rotation sensor 104 is separated from the input shaft 16, there is no need to change the inside of the automatic transmission 4 to mount the rotation sensor 104. Together with the input shaft 16
It is not necessary to increase the length, and thereby the overall length can be reduced and the size can be reduced.

Further, since the rotation sensor 104 is mounted using a part of the cooler boss 108, the rotation sensor 104 can be cooled by the cooling function of the oil cooler 106, and the rotation sensor 104 is mounted. Parts are not required separately, and the number of parts can be reduced.

FIG. 4 shows a special configuration of the present invention.
It shows an embodiment.

In the following embodiment, portions having the same functions as those in the above-described first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, on the outer peripheral surface of the direct clutch drum 82, a plurality of detection protrusions 112 are provided at equal intervals in the circumferential direction, and one of the detection protrusions 112 includes
A supply unit 112A such as an inclined surface or a curved surface that cleans the sensing unit 104A by supplying an atmosphere such as oil and air in the transmission case 8 to the sensing unit 104A of the rotation sensor 104 is formed.

According to the configuration of the second embodiment, the rotation sensor 10
4 detects the rotation state and the detection projection 11
Oil and atmosphere are supplied from the 2A feeding unit 112A to the sensing unit 104A, and the sensing unit 104A is cleaned by the cleaning action of the sensing unit 104A.
A can always be cleaned and its function can be maintained satisfactorily. Note that, in this case, all of the detection projections 112A
It is also possible to provide a feeding section 112A for each.
Also, on the outer peripheral surface of the direct clutch drum 82, only one detection protrusion 112A having a feeding unit 112A is provided to detect the rotation of the direct clutch drum 82 and to clean the sensing unit 104A. Is possible.

[0032]

As apparent from the above detailed description, according to the present invention, the rotation sensor for detecting the rotation of the input shaft is provided in the transmission case corresponding to the direct clutch drum. Since the rotation of the input shaft can be detected even when the input shaft is separated from the input shaft, it is not necessary to change the inside of the automatic transmission to mount the rotation sensor, and the overall length can be reduced and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an automatic transmission.

FIG. 2 is an enlarged sectional view of a main part of the automatic transmission of FIG.

FIG. 3 is a schematic configuration diagram of an automatic transmission.

FIG. 4 is a schematic view of a direct clutch drum part in a second embodiment.

FIG. 5 is a sectional view of a conventional automatic transmission.

FIG. 6 is a sectional view of another conventional automatic transmission.

FIG. 7 is a sectional view of the automatic transmission to which the rotation sensor is attached in FIG.

[Explanation of symbols]

 2 Engine 4 Automatic transmission 8 Transmission case 16 Input shaft 18 Output shaft 44 Front planetary unit 46 Rear planetary unit 52 Direct clutch 82 Direct clutch drum 104 Rotation sensor

Claims (2)

[Claims] 1. A torque converter is provided between a crankshaft of an engine and an input shaft supported on a transmission case, and an output shaft is supported on the transmission case coaxially with the input shaft. A planetary gear unit is provided on this output shaft,
A direct clutch provided with at least a direct clutch drum fixed to a sun gear of the planetary gear unit is provided as a clutch so as to cause a shift by the planetary gear unit, and the rotation of the input shaft is detected so as to confirm each gear position. A sensor structure for an automatic transmission, wherein a rotation sensor for detecting rotation of the input shaft is provided in the transmission case at a portion corresponding to the direct clutch drum. 2. The sensor structure for an automatic transmission according to claim 1, wherein the direct clutch drum is provided with a signal generating marker on an outer peripheral surface thereof so as to face the rotation sensor.