JP2708640B2 - Automatic transmission - Google Patents

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 a structure for mounting an oil temperature sensor for operating oil of the automatic transmission.

[0002]

2. Description of the Related Art An automatic transmission is provided with a torque converter and a transmission gear mechanism, and transmits the rotation of an engine taken out by a crankshaft to an input shaft via a torque converter and further to a transmission gear mechanism. Has become. The transmission gear mechanism is provided with a multi-disc brake or a multi-disc clutch, and engages and disengages these friction engagement elements to perform a gear shift. The engagement and disengagement of the friction engagement element is performed by hydraulic oil supplied to and removed from the hydraulic circuit. In this hydraulic circuit,
A valve, a hydraulic servomotor, an accumulator, and the like are provided, and a solenoid valve is provided to generate a signal oil pressure for each of these elements.

[0003] A solenoid that operates the solenoid valve is housed in an automatic transmission case while being attached to a valve body. An oil temperature sensor for measuring the operating oil temperature is provided in the automatic transmission case for the purpose of, for example, more accurately operating the solenoid valve.

[0004] To measure the oil temperature, an oil temperature sensor is provided with an oil temperature sensor terminal 51 on the side surface of an automatic transmission case 50 as shown in FIG.
The oil temperature detection terminal of the oil temperature sensor 52 is immersed in the oil passage inside the 0 side surface, and a connector 53 for connecting an electronic control unit is provided outside the automatic transmission case 50 side surface.

[0005]

In the conventional structure for mounting the oil temperature sensor 52, it is necessary to form a through hole in the automatic transmission case 50, and to immerse the oil temperature detecting terminal of the oil temperature sensor 52. It was necessary to form an oil passage.
Therefore, the mounting structure of the oil temperature sensor 52 becomes complicated,
There was a problem that the manufacturing cost increased.

Therefore, it is optimal to immerse the detection terminal of the oil temperature sensor 52 directly in the oil pan below the automatic transmission case 50 in which the valve body is housed. An electric connection cord is connected to a control device outside the automatic transmission case 50 through a through hole provided in the case 50. At this time, the hydraulic oil in the oil pan is moved between the cord and the through-hole of the automatic transmission case 50 due to a capillary phenomenon.
0 There was a case where it leaked out.

Accordingly, an object of the present invention is to provide an automatic transmission in which an oil temperature sensor is mounted inside an automatic transmission case with a simple mounting structure while preventing hydraulic oil from leaking out of the automatic transmission. is there.

[0008]

The above object of the present invention is achieved by the following constitution. That is, an automatic transmission that electrically connects an electronic control device outside the automatic transmission case and an oil temperature sensor disposed in the automatic transmission case via a connector device provided on a wall surface of the case. A curved groove for accommodating two terminals for measuring oil temperature and a thermistor connected between the terminals and electrically connected to the two terminals and supporting a cord having a surface coated An oil temperature sensor body comprising: an electrically insulating oil temperature sensor main body formed with a support portion of the terminal; and an oil temperature sensor that covers the terminal and is mounted on the oil temperature sensor main body. An elastic support member for holding the oil temperature sensor provided on the wall surface of the oil reservoir, a cylindrical casing penetrating through the wall surface of the automatic transmission case, and one end connected to the oil temperature sensor; A connection terminal connected to the other end of the cord and facing an outer wall surface of the automatic transmission case so as to be connectable to the electronic control unit; and a connection portion between the cord and the connection terminal and the vicinity thereof And a connector device which is fixedly molded in a cylindrical casing with a filling resin.

[0009]

The amount of current flowing between both terminals via the thermistor between the terminals of the electrically insulating oil temperature sensor body changes according to the oil temperature of the hydraulic oil, so that the oil temperature can be detected. At this time, the terminal can be protected by covering the terminal with the electrically insulating cap.
That is, there is no danger that metal chips or the like may enter between both terminals of the oil temperature sensor body immersed in the hydraulic oil and short-circuit between the terminals. Further, the cord connected to the terminal is embedded in the curved groove of the oil temperature sensor main body and is covered with the extending wall surface of the bracket or the cap, so that the cord is firmly held by the oil temperature sensor. Therefore, even when the oil temperature sensor is attached to the elastic support member on the wall surface of the automatic transmission, there is no possibility of breakage of a connection portion such as soldering of the cord and the terminal. Further, the oil temperature sensor can be easily attached to the elastic support member on the oil reservoir wall surface of the automatic transmission with one touch.

[0010] Further, since the connection portion of the cord and the connection terminal of the connector device portion on the wall surface of the automatic transmission case is integrally fixed to the cylindrical casing with a filling resin, the operating oil is supplied from the outer periphery of the covered electric wire cord to the capillary. The phenomenon does not leak out of the automatic transmission casing.

[0011]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a bottom view of a valve body 1 disposed on the bottom side of the automatic transmission, and FIG. 2 is a sectional view taken along line AA of FIG. Clamp 3 fixed with bolt 2 to the bottom of valve body 1
The oil temperature sensor 5 is tightly mounted. This oil temperature sensor 5 is connected to an electronic control unit (not shown) outside the automatic transmission case via a covered electric wire cord 6. The clamp 3 has the shape shown in FIG. 3 and is attached to the valve body 1 by the bolt 2 through the hole 7 in the clamp plane portion. At this time, the clamp 3 is positioned on the valve body 1 by a bent piece 9 on one side of the clamp plane portion. Therefore, the clamp 3 can be attached to the valve body 1 very easily. Then, the oil temperature sensor 5 can be tightly attached to the oil temperature sensor support piece 10 having a substantially U-shaped cross section at one end of the clamp 3 with one touch. As shown in FIG. 2, an oil pan 8 that covers the valve body 1 is provided.

The oil temperature sensor 5 has a structure shown in FIGS. First, the structure shown in FIGS. 4 to 10 will be described. FIG. 4 is a top view of the oil temperature sensor, FIG. 5 is a bottom view, and FIG. 6 is a side view of the electrically insulating oil temperature sensor main body 11 as viewed from the direction of arrow A in FIG. FIG. 7 is a sectional view taken along line BB of FIG. As shown in FIG. 7, the oil temperature sensor main body 11 is a thermistor 1 coated with silicon between the bipolar terminals 13.
4, and has a structure for detecting the oil temperature based on the resistance value of the thermistor 14 that changes according to the oil temperature. The exposed copper wires at the ends of the cords are fixed to the holes of both terminals 13 by soldering or the like (FIG. 10). The soldered cord is embedded in the groove 15 shown in FIGS.
A connector device (not shown) on the wall surface of the automatic transmission is connected by a cord 6 indicated by. This oil temperature sensor body 1
An electrically insulating cap 17 covering the terminal 13
Is shown in FIG. The cap 17 has a hole 18 for inserting both terminals 13 of the oil temperature sensor main body 11. Oil temperature sensor body 1
1 and the cap 17 are fixed by a bracket 19 shown in FIG. FIG. 10 shows a longitudinal sectional view of the oil temperature sensor main body 11 and the cap 17 fixed by the bracket.

If the embedded groove 15 for the cord 6 is formed in a curved shape as shown in FIG. 5, when the oil temperature sensor 5 is inserted into the clamp 3 shown in FIG. Cord 6 in groove 15 supported by bracket 19
The cord 6 connected by soldering or the like is not likely to be detached from the terminal 13 even if the cord 6 is pulled at the time of attachment, thereby improving workability.

FIGS. 11 to 14 show another structure of the oil temperature sensor main body 11 and the cap 17. The oil temperature sensor main body 11 shown in FIGS. 11 and 12 is provided with protrusions 21 on both side surfaces, and a rail-shaped notch 22 is provided at a corner portion where the upper surface portion and both side surface portions are in contact. The cap 17 is shown in FIG.
And FIG. 14 is a side view as seen from the direction of arrow a in FIG.
As shown in the figure, a three-way extending wall surface 23 is provided in contact with the bottom surface and both side surfaces of the oil temperature sensor main body 11, and a hole 2 for engaging the projection 21 on the side surface of the oil temperature sensor main body 11 is provided inside both side surfaces.
5 is provided. On both sides of the upper portion of the side wall of the cap 17, a rail-shaped rib 26 guided by the rail-shaped notch 22 of the oil temperature sensor main body 11 is provided. In this manner, the bare copper wire of the cord 6 is connected to the terminal 13 of the cord 6 by soldering or the like to the oil temperature sensor body 11 and embedded in the cord 6 and a curved groove (not shown) of the oil temperature sensor body 11.
The rail-shaped notch 21 of the oil temperature sensor body 11 and the rail-shaped rib 26 of the oil temperature sensor body 11
Of the cap 1 by inserting the
7 is inserted into the oil temperature sensor main body 11. When the cap 17 is inserted into the oil temperature sensor main body 11, the protrusions 21 on both side surfaces of the oil temperature sensor main body 11 enter into the engagement holes 25 provided at corresponding locations of the cap 17, and both are fixed.

FIGS. 15 to 19 show a connector device mounted on the wall surface of the automatic transmission case. FIG. 15 is a sectional view of the connector device 27 of the present embodiment, and FIG.
7, FIG. 17 is a left side view of FIG. 7, FIG. 18 is a bottom view of FIG. 7, and FIG.

In FIG. 15, one end has an insertion opening 29 for inserting the cord 6, and the other end has a terminal opening 31 for disposing a connection terminal 30 for connecting to an electronic control unit (not shown). The cylindrical casing 33 has a through hole extending from the insertion port 29 to the terminal port 31. Locking pieces 35 for positioning are formed on the upper and lower sides of the inner plate 34 which is located on the side of the terminal opening 31 and holds the connection terminal 30 in the inserted state. On the other hand, a convex portion 36 (FIG. 16) for locking with the locking piece 35 is formed on the inner periphery of the casing 33, and the inner plate 34 is connected to the casing 33.
Position with respect to

The inner plate 34 has the same number of insertion holes 37 as the number of the cords 6 extending from the insertion port 29 side to the terminal port 31. In the insertion hole 37, the inserted connection terminal 3 is inserted.
A pressing piece (not shown) such as a spring is provided to prevent the 0 from easily coming off, and a projection 38 for positioning with another connector device (not shown) is provided on the end face on the terminal port 31 side. The projection is formed.

The inner plate 34 includes a casing 33
Since it is formed as a separate member from the casing 33, highly accurate machining is possible, and positioning with respect to the casing 33 can be improved.

The cord 6 is covered with a resin film.
0 fixed. The fixing means may be formed by soldering, fusing, or an adhesive.
After the inner plate 34 to which the cord 6 and the connection terminal 30 are attached is fixed to the casing 33, a resin 39 such as an epoxy resin is filled into the casing 33 and molded.
The cord 6 and the connection terminal 30 are fixed to the casing 33. The resin 39 is for blocking the flow path of the hydraulic oil sent along the cord 6 by the capillary action. The rubber packing 41 for sealing the insertion opening 29 of the casing 33 prevents the resin 39 from leaking when the resin 39 is filled and the resin 39 from being deteriorated by hydraulic oil in the oil pan 8 (FIG. 2). Also, it is possible to prevent hydraulic oil from entering between the resin and the resin 39. The resin 39 is filled from a gap forming an opening between the inner plate 34 and the casing 33 with the terminal port 31 side up. Therefore, it is possible to prevent the resin 39 from adhering to the connection terminal 30 or the like and causing an electrical contact failure. And resin 39
Air holes 310, 311 and 312 are formed to allow the air inside the casing 33 to escape at the time of filling. An air hole 42 is formed in the portion of the inner plate 34 surrounded by the connection terminal 30 because air is difficult to escape. Since air is released from the air holes 42, 310, 311 and 312, formation of bubbles in the filling resin 39 is prevented.

A groove 43 provided on the outer periphery of the casing 33
Is formed in an automatic transmission case (not shown), and seals the casing 33 with an opening communicating between the inside and outside of the automatic transmission case.

The procedure for assembling the connector device 27 having the above configuration will be described.

First, the connection terminal 30 is fixedly connected to the end of the cord 6 by the caulking means 46. Subsequently, the tip of the connection terminal 30 is pressed into the insertion hole 37 of the inner plate 34. Inner plate 3 into which connection terminals 30 are press-fitted
4 is inserted into the casing 33 and positioned. Thereafter, the insertion opening 29 of the casing 33 is sealed by the rubber packing 41 inserted into the cord 6, and the resin 3 is placed in a space surrounded by the casing 33 and the inner plate 34.
9 are filled. With the curing of the resin 39, the code 6,
The connection terminal 30 is fixed to the casing 33. And
The oil temperature sensor 5 is connected to the end of the cord 6 on the casing 33 insertion port 29 side.

The connector device 27 thus formed
Is attached to an opening 49 provided in the automatic transmission case 50 or the oil pan 8 as shown in FIG. The groove 47 on the outer periphery of the casing 33 is for inserting a keep plate 48 (FIG. 19) into the groove 47 and fixing the keep plate 48 to the automatic transmission case 50.

Although not shown, the connector device 27 may be applied to a casing 33 having a bent shape.
Since the connection terminal 30 is inserted in the inner plate in advance,
Even in the case of the bent casing 33, the workability does not deteriorate. Further, the inner plate 34 has a plurality of holes 37 through which the connection terminals 30 penetrate, and a locking piece 35 for positioning the connection terminals 30, so that the insertion opening 29 is large enough to pass the cord 6. Is sufficient and workability is improved. Further, even when the casing 33 is long or when it is bent in the middle, it can be easily assembled.

Further, the connector device 27 has a cord 6
Further, since the connection terminals 30 can be positioned, a short circuit between the connection terminals 30 can be prevented.

It should be noted that the structure of the connector device 27 is merely an example.
No. 3,256, JP-A-58-39216 and the like can be employed.

[Brief description of the drawings]

FIG. 1 is a structural view of an oil temperature sensor mounting portion according to an embodiment of the present invention.

FIG. 2 is a side cutaway view of an oil temperature sensor mounting portion according to one embodiment of the present invention.

FIG. 3 is a drawing showing a clamp (elastic support member) for attaching an oil temperature sensor according to one embodiment of the present invention.

FIG. 4 is a top view of an oil temperature sensor main body according to one embodiment of the present invention.

FIG. 5 is a bottom view of the oil temperature sensor main body according to one embodiment of the present invention.

FIG. 6 is a side view of an oil temperature sensor main body according to one embodiment of the present invention.

FIG. 7 is a sectional view of an oil temperature sensor main body according to one embodiment of the present invention.

FIG. 8 is a view showing a cap according to an embodiment of the present invention.

FIG. 9 is a view showing a bracket for fixing an oil temperature sensor body and a cap according to one embodiment of the present invention.

FIG. 10 is a partial cross-sectional view showing a state where the oil temperature sensor of the present invention and a cap are combined.

FIG. 11 is a view showing an oil temperature sensor main body according to another embodiment of the present invention.

FIG. 12 is a view showing an oil temperature sensor main body according to another embodiment of the present invention.

FIG. 13 is a view showing a cap according to another embodiment of the present invention.

FIG. 14 is a view showing a cap according to another embodiment of the present invention.

FIG. 15 is a sectional view of a connector device according to an embodiment of the present invention.

FIG. 16 is a right side view of the connector device according to the embodiment of the present invention.

FIG. 17 is a left side view of the connector device according to the embodiment of the present invention.

FIG. 18 is a bottom view of the connector device according to the embodiment of the present invention.

FIG. 19 is an attached state diagram of the connector device according to the embodiment of the present invention.

FIG. 20 is a diagram showing a state of attachment of an oil temperature sensor to a conventional automatic transmission case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body (oil reservoir wall surface) 3 Clamp (elastic support member) 6 Cord 11 Oil temperature sensor main body 13 Terminal 14 Thermistor 15 Curved groove 17 Electrical insulating cap 19 Bracket 27 Connector device 30 Connection terminal 33 Cylindrical casing 39 Filling Resin 50 automatic transmission case

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiko Noba 1 Toyota Town, Toyota City, Aichi Prefecture Within Toyota Motor Corporation (72) Inventor Junji Fukushiro 1-7-1 Yokoi, Shimada City, Shizuoka Prefecture Yazaki Keiki Co., Ltd. (72) Inventor Ken Asami 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-57-73256 (JP, A) JP-A-58-39216 (JP, A) 2-245625 (JP, A) Hikaru 2-5642 (JP, U)

Claims (1)

(57) [Claims] An electronic control device outside the automatic transmission case;
An automatic transmission for electrically connecting an oil temperature sensor disposed in an automatic transmission case via a connector device provided on a wall surface of the case, comprising two terminals for measuring oil temperature and the terminal. An electric insulation that accommodates a thermistor connected therebetween, and is electrically connected to the two terminals, and is formed with a curved groove for supporting a surface-coated cord and a support portion of the terminal. An oil temperature sensor composed of an oil temperature sensor main body, an electrically insulating cap mounted on the oil temperature sensor body covering the terminal, and an oil temperature sensor provided on an oil sump wall surface of the automatic transmission. An elastic support member, a tubular casing that is mounted to penetrate the automatic transmission case wall surface, and is connected to the other end of a cord having one end connected to the oil temperature sensor, and A connection terminal facing the outer wall side of the automatic transmission case so as to enable connection, and a connection portion between the cord and the connection terminal and the vicinity thereof are fixedly molded in a cylindrical casing with a filling resin. An automatic transmission, comprising: a connector device.