JPH04125357A - Automatic transmission - Google Patents

Abstract

PURPOSE:To facilitate arrangement of a filler tube and reduce its size by constructing such that a lower tube of the filler tube extends from an extending portion of a small diameter portion through a drain oil passage and reaches an oil reservoir, while an upper tube is engaged with an upper end of the lower tube and extends upward. CONSTITUTION:An extending portion 36 is integrated with a center case 4 at a side of its small-diameter portion 4a and behind a differential gear 3. A lower tube 26 is inserted obliquely through an opening formed on the portion 36. The lower tube 26 extends downward while penetrating through a drain passage 40 formed on the small diameter portion 4a, whose lower end is opposed to a strainer 14. A filler tube 22 has a bending form because of the regulation of arrangement. An upper tube 24 has a bending portion 24a between a substantially straightly extending portion through a bracket 32 and a portion fitted and connected to the lower tube 26. The lower tube 26 has bending portions respectively in the vicinity of the extending portion 36 and in the vicinity of the lower end thereof.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an automatic transmission for a vehicle.

(Prior Art) Conventionally, automatic transmissions for vehicles receive torque output from an engine through a torque converter, and shift the torque through an automatic transmission 41m1 to drive each drive wheel. There is. In the above automatic transmission mechanism, each element of the plurality of planetary gear units is a clutch,
It is selectively engaged and disengaged via brakes, one-way clutches, etc.

By the way, each gear constituting the planetary gear unit in the automatic transmission mechanism, the sprag of the one-way clutch,
Lubricating oil is supplied to relatively rotating members such as various bearings in order to improve the sliding characteristics between the members. Furthermore, in the above-mentioned clutches and brakes, engagement is usually performed by bringing a large number of thin plates into frictional contact, and cooling oil is supplied to prevent burning and wear of the friction members.

Further, the torque converter is supplied with oil as a fluid for transmitting torque, and the clutch and brake are supplied with servo oil for generating apply pressure to engage the thin plates.

The above lubricating oil, cooling oil, servo oil, etc.
It is stored in an oil pan attached to the bottom of the automatic transmission, sucked in by an oil pump, regulated through various valves, and then supplied to each part of the automatic transmission. Each of the above-mentioned valves is integrally disposed within a valve body installed within the above-mentioned oil pan.

By the way, the above-mentioned valve body is usually attached to the lower surface of the automatic transmission mechanism within the oil pan. A level gauge is removably installed in the oil pan,
When determining whether the oil level is sufficient, the level gauge inserted into the oil pan can be pulled out and the oil level can be checked based on the state of the attached oil.

In order to allow the level gauge to be easily inserted into and removed from the oil pan, a filler tube is provided surrounding the level gauge to guide the insertion and removal. Further, the filler tube has a sufficient length and has a lower end opened inside the oil pan so that an inspector can easily insert and remove the level gauge.

For ease of mounting, the filler tube is usually divided into two parts: a lower tube and an upper tube.
The shape and mounting position of the above upper tube can be changed depending on the vehicle model (1983).
-145616, Utility Model Application Publication No. 1-102415).

In this case, the lower tube is fixed to the cylinder block from the oil pan side, or is integrally attached to the oil pan.

(Problem to be solved by the invention!) However, in the conventional automatic transmission described above, when installing it in a relatively small vehicle, it is difficult to install the lower tube, so the filler tube must be installed at a certain position. The degree of freedom will be lost.

In other words, in the case of small vehicles, in addition to gaining ground clearance,
In order to improve mounting ease, valve bodies are installed next to the automatic transmission mechanism, but in this type of automatic transmission there is no oil pan, and the valve body is installed at the bottom of the automatic transmission case. An oil reservoir is formed, and oil used for lubrication, cooling, and application of the hydraulic servo is collected in the oil reservoir, sucked from the oil reservoir by an oil pump, and supplied to each element.

In this case, the oil reservoir is integrally constructed with the bottom of the automatic transmission case, so the lower tube cannot be attached to the cylinder block or integrally attached to the oil pan.

Therefore, not only is there no freedom in the mounting position of the filler tube, but also the mounting work becomes complicated.

The present invention solves the problems of the conventional automatic transmission described above, and
To provide an automatic transmission which not only ensures flexibility in the mounting position of a filler tube but also can be easily mounted and does not increase in size.

(Means for Solving the Problems) For this purpose, the automatic transmission of the present invention includes a transmission mechanism section that changes the speed of the rotation input from the fluid transmission device and outputs the same, and a transmission mechanism section that is arranged in parallel with the transmission mechanism section. , a counter gear section that reverses the rotation output from the transmission mechanism section, and a differential device that is connected in parallel to the counter gear section and transmits the rotation of the counter gear section to the driving wheels.

A transmission case is provided surrounding the transmission mechanism section, counter gear section, and differential device, and the transmission case has a valve body erected on the side thereof, and a front portion of the transmission mechanism section. , a large diameter part that surrounds the counter gear part and the differential gear, and a small diameter part that accommodates the rear part of the transmission mechanism part.

Further, the transmission case has an oil sump at the bottom, and a drain oil path at the side of the small diameter portion for collecting oil from the rear portion of the transmission mechanism to the oil sump.

A filler tube, which is composed of an upper tube and a lower tube, and into which a level gauge is inserted, is provided. The lower tube penetrates into the transmission case from an overhang formed on the side of the small diameter portion, extends within the drain oil passage, and reaches the vicinity of the oil reservoir. Further, the upper tube is fitted onto the upper end of the lower tube and extends upward.

(Operations and Effects of the Invention) According to the present invention, there is provided a speed change mechanism section that changes the speed of the rotation input from the fluid transmission device and outputs it as described above, and a speed change mechanism section that is disposed in parallel with the speed change mechanism section. The engine has a counter gear that reverses the rotation output from the engine, and a differential that is connected in parallel to the counter gear and transmits the rotation of the counter gear to the drive wheels, so the rotation generated by the engine is The signal is transmitted to the transmission mechanism section via the fluid transmission device, and a gear change corresponding to each gear stage is performed. The rotation output from the transmission mechanism is reversed by the counter gear,
It is transmitted to the drive wheels via a differential.

A transmission case surrounds the speed change mechanism section, counter gear section, and differential device. The transmission case consists of a large diameter part that surrounds the front part of the transmission mechanism, the counter gear part, and the differential, and a small diameter part that accommodates the rear part of the upper rudder transmission mechanism. The bottom part has an oil sump, and the side of the small diameter part has a drain oil passage for collecting oil from the rear part of the transmission mechanism part to the oil sump. Lubricate the parts, clutch,
The oil used to differentially operate the brakes, etc. is collected into the oil reservoir via the drain oil passage.

Further, a projecting portion is formed on a side of the small diameter portion, and the lower tube of the filler tube penetrates into the transmission case from the projecting portion, extends within the drain oil passage, and reaches the vicinity of the oil reservoir. Further, an upper tube is fitted to the upper end of the lower tube and extends upward to guide the level gauge.

In this way, even in cases where the valve body is installed upright on the side of the transmission case, the oil pan cannot be attached to the bottom of the transmission case, and the bottom of the transmission case itself serves as the oil sump, the level gauge cannot be used. A filler tube for inserting the filler tube may be provided in the container.

Furthermore, since no special space is required for arranging the filler tube, the automatic transmission can be downsized.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a rear side view of the automatic transmission of the present invention, FIG. 2 is a front side view of the automatic transmission of the present invention, FIG. 3 is a diagram of the pulp body installation state of the automatic transmission of the present invention, and FIG. 4 1 is an enlarged view of main parts of an automatic transmission according to the present invention.

In the figure, reference numeral 1 indicates a transmission mechanism unit that changes speed in response to rotation output from a torque converter (not shown) and outputs an output from an output gear; A counter gear section 3, which reverses the rotation, is disposed in parallel with the counter gear section 2, and is a differential device that transmits the rotation of the counter gear section 2 to the driving wheels.

The transmission case that houses the automatic transmission includes a front case that houses the torque converter, a center case 4 that is connected to the front case, and a center case 4 that houses the torque converter.
The main part of the transmission mechanism l and the counter gear part 2 are housed in the center case 4.

A connecting surface 5 is formed to connect the front case and the center case 4, and a connecting surface 6 is formed to connect the center case 4 and the rear case. The cases are connected by bolts.

The center case 4 includes a small diameter portion 4a that accommodates the rear portion of the transmission mechanism portion 1, and a large diameter portion 4b that accommodates the front portion of the transmission mechanism portion 1 and the counter gear portion 2. That is, the rear portion of the transmission mechanism section 1 is surrounded by the small diameter section 4a and the rear case.

By the way, automatic transmissions include a fluid transmission device, such as a torque converter, to transmit the rotation of the engine. The torque converter has a pump impeller that transmits engine rotation, and as the pump impeller rotates, oil within the torque converter circulates, causing the turbine runner to rotate accordingly. Therefore, the torque converter is filled with oil for transmitting torque.

In addition, the transmission mechanism part l of an automatic transmission has a plurality of planetary gear units, gears such as an output gear, support members such as bushes, bearings, and washers, sprags of a one-way clutch, etc. Dynamic friction occurs. Therefore, in order to suppress wear of each member, lubricating oil is supplied.

Furthermore, the automatic transmission has Wl friction engagement elements such as brakes and clutches connected to a carrier that supports each element of the planetary gear unit, that is, the ring gear, sun gear, and pinion gear. Each gear stage is realized by selective engagement.

Each brake and clutch is formed by a hydraulic servo and a plurality of thin plates that are engaged and released by the hydraulic servo.

The hydraulic servo is composed of an annular cylinder and an annular piston that slides inside the annular cylinder, and by supplying oil into the cylinder chamber formed between the two, the thin plate is engaged, and by draining the oil. The slats can be released.

A plurality of thin plates forming each brake, clutch, etc. generate frictional heat when engaged. Therefore, cooling oil is supplied to the thin plate portion in order to prevent overheating due to the frictional heat.

In this way, in an automatic transmission, oil is supplied to various members, and all of the oil is supplied by an oil pump operated by the rotation of the engine.

The oil pump is disposed between the torque converter and the transmission mechanism section 1, and is attached to the center case 4. Therefore, a mounting surface 8 for the oil pump is formed inside the connecting surface 5 of the center case 4, and an oil passage 9 communicating with the suction chamber and discharge chamber in the oil pump is formed in the mounting surface 8. .

The oil pressure generated by the oil pump is regulated by a regulator valve and supplied to each member via various valves, but the oil after operating each member is recovered by its own weight.

The recovered oil is stored in an oil reservoir 12 integrally formed at the bottom of the transmission case, and is sucked into the suction side of the oil pump. At this time, a strainer 14 is provided near the bottom in order to remove iron powder and the like mixed into the pond. Above center case 4
An opening 16 is provided at the bottom of the large diameter portion 4b,
Via the opening 16 the filter of the strainer 14 can be replaced. The opening 16 is closed by a lid (not shown), and a portion of the strainer 14 is accommodated in the lid.

The oil sucked by the oil pump through the strainer 14 is then sent to the valve body 20, and the pressure is regulated by a regulator valve disposed inside the valve body 20. It is supplied to the hydraulic fluid chambers of each clutch and brake.

The valve body 20 is erected next to the center case 4 as shown in FIG. 2, and no oil pan is provided at the bottom of the transmission case.

Therefore, the ground clearance of the vehicle can be set large.

By the way, as mentioned above, the oil used for various purposes is collected in the oil sump 12, and then sucked in by the oil pump and supplied to each part. A level gauge is inserted into the reservoir 12. A filler tube 22 made of iron is provided to guide the level gauge. The filler tube 2
2 is composed of an upper tube 24 and a lower tube 26, as shown in FIG. 1, and an O-ring 28 seals between the two.

The upper tube 24 is attached to a mounting portion 30 formed above the center case 4 via a bracket 32. 34 is a breather arranged on the bracket 32. The shape and dimensions of the upper tube 24 can be changed as appropriate depending on the type of vehicle.

Further, a projecting portion 36 is formed integrally with the center case 4 on the side of the small diameter portion 4a of the center case 4 and behind the differential gear 3, and a projecting portion 36 is formed integrally with the center case 4. Then, the lower tube 26 is inserted diagonally. There is an O between the lower tube 26 and the center case 4.
A ring 38 is provided to provide a seal between the interior and exterior of the transmitter case.

The lower tube 26 is connected to the small diameter portion 4a of the center case 4.
The drain oil passage 40 is formed in the drain oil passage 40, and the lower end 42 (FIG. 4) reaches a position facing the strainer 14. Note that 46 is a bracket that is fixed to the projecting portion 36 and supports the lower tube 26.

In this way, the filler tube 22 extending from the side of the small diameter portion 4a of the center case 4 through the center case 4 is
Due to installation constraints, it has a curved shape. That is,
A curved portion 24a is formed in the upper tube 24 between a portion extending substantially vertically via the bracket 32 and a portion fittingly connected to the lower tube 26.
6 has a curved portion 26a near the protruding portion 36, and the lower end 4
A curved portion 26b is formed in the vicinity of 2, respectively.

When the level gauge 27 is inserted into the filler tube 22, the tip of the filler tube 22 slightly protrudes from the lower end 42 of the lower tube 26. Therefore, the level gauge 27 is formed into an elongated shape, and is twisted 90 degrees from the upper end to the lower end by the twisting part 27a so that it can be inserted downward into the container via the curved parts 24a, 26a, and 26b. It is.

In FIG. 2, reference numeral 48 denotes a shielding plate arranged to prevent the oil in the oil reservoir 12 from being agitated by the ring gear or the like in the differential gear 3.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is a rear side view of the automatic transmission of the present invention, FIG. 2 is a front side view of the automatic transmission of the present invention, FIG. 3 is a valve body installation state diagram of the automatic transmission of the present invention, and FIG. 4 1 is an enlarged view of main parts of an automatic transmission according to the present invention. 1... Transmission mechanism section, 2... Counter gear section, 3...
- Differential device, 4... Center case, 22... Filler tube, 24... Upper tube, 26... Lower tube, 36... Overhang portion, 40... Drain oil path. Patent applicant: Aisin AW Duburi Ni Co., Ltd. Representative: Patent attorney Makoto Kawai (2 others) Figure ◎

Claims (1)

[Claims] a transmission mechanism section that changes the speed of the rotation input from the fluid transmission device and outputs the same; a counter gear section that is arranged in parallel with the transmission mechanism section and reverses the rotation output from the transmission mechanism section;
a differential device connected in parallel to the counter gear section and transmitting rotation of the counter gear section to the driving wheels; and the transmission mechanism section;
It has a transmission case that surrounds a counter gear section and a differential device, and the transmission case has a valve body erected on its side, and surrounds the front part of the transmission mechanism section, the counter gear section, and the differential device. It consists of a large diameter part that accommodates the rear part of the transmission mechanism part and a small diameter part that accommodates the rear part of the transmission mechanism part, and has an oil reservoir at the bottom, and a side part of the small diameter part that carries oil from the rear part of the transmission mechanism part to the oil reservoir. A lower tube has a drain oil passage for recovering oil, penetrates into the transmission case from an overhang formed on the side of the small diameter part, extends inside the drain oil passage, and reaches the vicinity of the oil sump. and an upper tube that is fitted into the upper end of the lower tube and extends upward.