JP2576055Y2 - Torque sensor mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an automatic transmission,
The present invention relates to a structure for mounting a torque sensor for detecting a torque of a rotating shaft.

[0002]

2. Description of the Related Art In automatic transmissions installed in automobiles and the like, gear shift control, line pressure control, and the like are generally performed based on the engine speed and throttle valve opening. In order to improve the characteristics of the transmission, the torque of the rotating shaft such as the turbine shaft is detected by a torque sensor.
A device for performing the above-described control based on the detected torque value has been provided. As a means for detecting the torque, a pair of detected parts having a circumferential position signal engraved on the outer peripheral surface of the rotating shaft are arranged at an interval in the front-rear direction (that is, axial direction). A pair of magnetic heads for detecting the position signal are provided at a position facing the detected portion, and the amount of twist of the rotating shaft is measured based on the position signals detected by these magnetic heads. There is known one that seeks torque.

The mounting of the torque sensor having the magnetic head and the like is described in, for example, Japanese Patent Application Laid-Open No. 64-21255.
The magnetic head is buried in a stator supporting portion for supporting a stator of a torque converter as shown in the publication, or a rod is extended from a partition fixed to a casing of an automatic transmission toward the rotating shaft, and the rod is For example, means for fixing the torque sensor to the tip of the motor is used.

[0004]

Generally, the stator supporting portion has a relatively low rigidity and extends from a partition fixed to the casing of the automatic transmission to the torque converter side. Since the torque of the stator directly acts on the stator support portion, the stator supporting portion itself is likely to be twisted. Therefore, in the structure in which the torque sensor is mounted on the stator support, the deformation of the stator support itself affects the detection value of the torque sensor, so that accurate detection may not be performed.

On the other hand, in the structure in which the torque sensor is mounted on the tip of the rod extending from the partition wall, the space for disposing the torque sensor is easily restricted, and the space between the front and rear magnetic heads cannot be made sufficiently large. This hinders improvement in torque measurement accuracy.

Further, in the above two structures, the position of the torque sensor hardly changes even when the rotating shaft is blurred, so that the clearance between the torque detecting unit on the rotating shaft and the torque sensor fluctuates. The measurement accuracy may be adversely affected.

[0007] Further, in such a torque sensor mounting structure, it is also a major problem to further facilitate the mounting operation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a torque sensor mounting structure capable of improving torque detection accuracy and torque sensor mounting workability.

[0009]

According to the present invention, there is provided a cylindrical friction element supporting member having a partition wall fixed to a casing of an automatic transmission and a shaft hole for accommodating a rotating shaft.
A structure for attaching a torque sensor for detecting torque generated on the rotating shaft through the torque detecting unit to an automatic transmission having a torque detecting unit provided on a peripheral surface of the rotating shaft, wherein the torque detecting unit includes: The position is set at a position in the shaft hole of the frictional element support member, and as the torque sensor, a pair of front and rear detection heads, and a head holding ring surrounding the torque detecting portion of the rotating shaft from outside are provided. A pair of front and rear head holding portions projecting radially outward from the head holding ring are formed at an interval from each other, and the detection head is mounted on these head holding portions. And a notch groove that opens in the axial direction, and inserts the head holding ring into the shaft hole while inserting the head holding portion into this notch groove The detection head in which arranged at a position opposed to the torque detecting unit by Rukoto.

[0010]

According to the above structure, by mounting the detection head on the head holding portion of the head holding ring, the distance between the two detection heads can be kept constant before mounting.
By simply inserting the head holding ring into the shaft hole and the notch groove of the friction element supporting member, the entire torque sensor can be assembled in the friction element supporting member. Since this friction element support member has a partition fixed to the casing of the automatic transmission, its rigidity is higher than that of the stator support portion and the like,
Therefore, it is hardly affected by the torque and the like that the stator of the torque converter receives.

In a state where the torque sensor is mounted, since the head holding portion of the head holding ring is inserted into the cutout groove, the rotation of the head holding ring with respect to the friction element supporting member is restricted. Therefore, during the driving of the rotating shaft, the torque of the rotating shaft is detected satisfactorily by the detection head which is stationary with respect to the rotating shaft through the torque detecting unit on the outer peripheral surface of the rotating shaft. Moreover, during this operation, an oil film is formed by the lubricating oil or the like between the inner peripheral surface of the head holding ring and the outer peripheral surface of the rotating shaft, so that the clearance between the detecting head and the torque detecting unit is maintained regardless of the displacement of the rotating shaft. It is always kept almost constant.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.

The automatic transmission shown in FIG. 1 includes a torque converter 10 and a speed change mechanism.
Are a front cover 12, a pump 14, a turbine 16,
And a stator 32. A centerpiece 11 is provided at the center of the front cover 12, and a driving force of an unillustrated engine is introduced from the centerpiece 11 to the front cover 12, whereby the front cover 12 and the pump 14 are integrally rotated. . This pump 14
Is connected to an oil pump blade 36 via an oil pump drive sleeve 34, and the oil pump blade 36 is also driven to rotate integrally with the pump 14. The turbine 16 is fixed to a turbine hub 18, and the turbine hub 18 is fixed to a front end of an input shaft (turbine shaft; rotating shaft of the present invention) 20 of the transmission mechanism. The input shaft 20 has an oil passage 22 having a predetermined shape inside thereof, and is connected to an output shaft (not shown).

In this structure, the front cover 1
When the driving force of the engine is transmitted to the pump 2 and the pump 14,
The torque is further transmitted to the turbine 16, and the input shaft 20 connected to the turbine 16 rotates.

On the other hand, this automatic transmission includes a cylindrical member including a stator support 24, an oil pump cover (partition) 26, and a friction element support 28. Each part 2
The input shaft 20 is inserted into a shaft hole 25 provided at the center thereof.

The stator support portion 24 extends from the oil pump cover portion 26 to the torque converter 10 side through the inside of the oil pump drive sleeve 34. The stator 32 is connected to the free end of the stator 32 via a one-way clutch 30. It is installed. Oil pump cover 26
, An oil pump case 38 is fixed by bolts 41, 42 and the like in a state facing the oil pump case 38, and an oil pump housing for accommodating the oil pump blade 36 is formed by both. The oil pump cover 26 and the oil pump case 34 are fixed to the casing 40 of the automatic transmission by the bolts 42 and bolts (not shown). The casing 40 is disposed behind the oil pump cover 26, and the casing 4
A transmission mechanism provided with friction elements such as a clutch and a brake, and a planetary gear mechanism is provided in the cylinder 0.

The friction element support portion 28 constitutes the friction element support member of the present invention together with the oil pump cover portion 26, and a predetermined friction of the automatic transmission is provided on the outer peripheral surface of the friction element support portion 28. An element (the clutch drum 44 in this embodiment) is rotatably supported. A torque sensor 46 for detecting the torque of the input shaft 20 is attached to a region extending from the friction element support 28 to the oil pump cover 26.

Specifically, on the outer peripheral surface of the input shaft 20, the oil pump cover 26 as shown in FIG.
A magnetic recording section (torque detecting section) 45 is provided in an area extending from the frictional element supporting section 28 to the friction element supporting section 28, and a position signal of the input shaft 20 in the circumferential direction is recorded in the magnetic recording section 45. Further, in a region extending from the oil pump cover portion 26 to the friction element supporting portion 28, a cutout groove 43 which is continuous with the shaft hole 25 is formed. The cutout groove 43 has a rectangular cross-sectional shape as shown in FIG. And opens rearward (rightward in FIG. 2).

On the other hand, as shown in FIG. 2, the torque sensor 46 includes a head holding ring 48 having a shape surrounding the magnetic recording section 45 from the periphery. At a part of the circumferential direction of the head holding ring 48, a pair of head holding portions 50 are formed at appropriate intervals in the front-rear direction (that is, axial direction) so as to protrude from the outer peripheral surface of the ring. Detection head (magnetic head) in holding unit 50
52 are held.

The entire head holding ring 48 is inserted into the shaft hole 25 outside the input shaft 20 while inserting the head holding portion 50 into the notch groove 43.
Thereby, the detection head 52 is disposed at a position facing the magnetic recording section 45 of the input shaft 20. Each detection head 5
2 reproduces a circumferential position signal of the input shaft 20 recorded in the magnetic recording unit 45 while the input shaft 20 is rotating, and outputs the reproduced signal (here, a pulse signal) to the arithmetic unit 54; The calculation unit 54 is configured to calculate the torque of the input shaft 20 from the phase shift amount between the pulse signals input from the two detection heads 52 and output the information signal to a control unit (not shown). . Then, the shift control and the line pressure control of the automatic transmission are executed based on the torque detection signal.

As shown in FIG. 2, a bush 56 for supporting the input shaft 20 is fixed at a position immediately behind the head holding ring 48 in the shaft hole 25, and the bush 56 fixes the head holding ring 48. Is positioned in the axial direction.

According to such a torque sensor mounting structure, the following effects can be obtained.

(A) The torque sensor 46 is an oil pump cover 2 fixed to the housing 40 of the automatic transmission.
6 and the friction element supporting portion 28, etc., are attached to a relatively high rigidity member. Even if a torque is applied to the stator 32, the oil pump cover portion 26 and the friction element supporting portion 28 are hardly torsionally deformed. . Therefore, as in the prior art, the torque sensor 4 is attached to the stator support portion 24 which has a relatively low torsional rigidity and directly receives the torque of the stator 32.
6, it is possible to realize highly accurate input shaft torque detection that is hardly affected by the torque of the stator or the like.

(B) Since the torque sensor 46 is disposed on the oil pump cover 26 and the frictional element support 28 having sufficient dimensions in the axial direction, it is necessary to secure a sufficient distance between the detection heads 52. Accordingly, the accuracy of torque detection can be further improved.

(C) By mounting both detection heads 52 in the head holding portion 50 of the head holding ring 48, the entire head holding ring 48 is pivoted while the distance between the two detection heads 52 is kept constant in advance. Since the detection heads 52 are mounted in the holes 25, the mounting operation can be made easier as compared with a case where each of the detection heads 52 is individually disposed at a predetermined position in the automatic transmission. Moreover, by utilizing the protrusion of the head holding portion 50, the entire head holding ring 48 can be prevented from rotating with a simple structure in which the head holding portion 50 is simply inserted into the notch groove 43.

(D) During the rotation of the input shaft 20, the lubricating oil is supplied from the oil passage 22 to form an oil film between the head holding ring 48 and the input shaft 20. Direction, the clearance between the inner peripheral surface of the head holding ring 48 and the outer peripheral surface of the input shaft 20, in other words, the distance between the detection head 52 and the magnetic recording unit 45 can always be kept constant. The torque detection accuracy can be further improved.

In addition to the above, in the structure of this embodiment,
Since the bush 56 for supporting the input shaft 20 is provided at the position shown in FIG. 2, that is, at a position immediately behind the head holding ring 45, the bush 56 can also be used as an axial positioning member for the head holding ring 48. effective.

In the above embodiment, the torque sensor 46 for detecting the input shaft 20 has been described. However, the present invention is also applicable to a mounting structure of a torque sensor for detecting the torque of the output shaft (not shown). It is equally applicable. In this case, the torque sensor may be mounted on the friction element supporting portion on the rear side (right side of the portion shown in FIG. 1) in the same manner as described above.

Further, in the above-described embodiment, the torque sensor 46 is provided in the area extending over both the oil pump cover 26 and the frictional element support 28, but the torque sensor 46 is provided only in the area of the frictional element support 28. 46 may be provided.

[0030]

As described above, according to the present invention, a pair of front and rear detection heads are respectively mounted on the head holding portions of the head holding ring, and these head holding portions are connected to the shaft holes in the friction element supporting member having the partition walls. Since the head holding ring is inserted into the shaft hole while each of the detection heads is opposed to the torque detecting portion of the rotating shaft while being inserted into the notch groove, the torque sensor is mounted on the highly rigid friction element supporting member. By arranging, it is possible to prevent the torque of the stator of the torque converter from affecting the torque detection result of the rotating shaft,
In addition, a sufficient distance between the detection heads can be ensured, and a clearance between the detection head and the torque detection unit can be kept constant by an oil film formed between the head holding ring and the input shaft, According to the above, there is an effect that the torque detection accuracy can be greatly improved. In addition, since both detection heads are mounted in the head holding portion of the head holding ring, and the entire head holding ring is mounted in a state where the distance between the two detection heads is kept constant in advance, each of the detection heads can be automatically set individually. As compared with a structure in which the torque sensor is disposed at a predetermined position in the transmission, there is an effect that the mounting work of the torque sensor can be more easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an automatic transmission according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a mounting structure of a sensor in the automatic transmission.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Torque converter 20 Input shaft (rotating shaft) 25 Shaft hole 26 Oil pump cover part (partition wall) 28 Friction element support part (constituting friction element support member) 43 Notch groove 44 Clutch drum (friction element) 45 Magnetic recording part (torque) (Detection unit) 46 Torque sensor 48 Head holding ring 50 Head holding unit 52 Detection head

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/02 F16H 59/14 G01L 3/10

Claims (1)

(57) [Scope of request for utility model registration] A first friction element supporting member having a partition wall fixed to a casing of the automatic transmission and a shaft hole for accommodating a rotary shaft, and a torque detecting portion provided on a peripheral surface of the rotary shaft. A structure for mounting a torque sensor for detecting a torque generated on the rotating shaft through the torque detecting unit to the automatic transmission, wherein the position of the torque detecting unit is set to a position in a shaft hole of the friction element supporting member. The torque sensor is provided with a pair of front and rear detection heads, and a head holding ring surrounding the torque detection unit of the rotating shaft from outside, and the head holding ring is provided with a front and rear projection radially outward from the head holding ring. A pair of head holders are formed at an interval from each other, and the detection head is mounted on these head holders. And a notch groove that opens in the axial direction, and inserts a head holding ring into the shaft hole while inserting the head holding portion into the notch groove, thereby connecting the detection head with the torque detection portion. A torque sensor mounting structure, wherein the torque sensor mounting structure is disposed at an opposing position.