JPH0670456B2 - Oil level measuring mechanism for vehicle automatic transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil level measuring mechanism for measuring an oil level in an oil pan provided below a vehicle automatic transmission case.

[Prior Art] Conventionally, as an oil level measuring mechanism for detecting the amount of oil (having a function of lubricating oil and hydraulic oil) used in an automatic transmission for a vehicle, as disclosed in Japanese Utility Model Publication No. 56-129505. Things are known. This will be described with reference to FIG. 5. The oil pan 2 is attached to the lower portion of the transmission case 1, and oil is stored inside, and the oil pan 2 is attached to the side of the oil pan 2. And an oil level gauge 4 inserted into the tube 3 for measuring the amount of oil in the tube 3. The oil pan 2 is a flange for mounting the oil pan 2 on the transmission case 1. A portion 2A, a side surface portion 2B, and a bottom plate portion 3C that forms the bottom of the oil pan 2 are provided, and a tube mounting hole 2D for mounting the tube 3 is provided on the side surface portion 2B provided substantially vertically. The tube 3 has an oil port 3A opened in the oil pan 2 and a gauge insertion port 3B into which the oil level gauge 4 is inserted, and a connection flange 3C for mounting the oil pan is welded to the outer periphery of the oil port 3A side to remove the oil. The port 3A is mounted in the tube mounting hole 2D via the O-ring 3D between the tube mounting hole 2D of the oil pan 2 and the connection flange 3C, and the tube mounting hole 2D
It was attached by welding the side surface portion 2B on the outer periphery and the connecting flange 3C of the tube 3.

Since the tube 3 is attached to the oil pan 2 by the connecting flange 3C, the connecting flange 3C is attached to the outer periphery of the tube mounting hole 2D.
A flat surface for welding is required, and the tube mounting hole 2D has a limit slightly above the bottom of the side surface portion 2B. The oil port 3A side of the tube 3 is vertically attached to the side surface portion 2B of the oil pan 2, and the gauge insertion port 3B is provided above the oil port 3A via the bent portion R, and the oil port 3A and the bent portion R are substantially the same. It was located at the height.

In addition, since the oil used in the automatic transmission has its viscosity characteristics and expansion coefficient remarkably changed depending on the temperature, the oil level gauge 4 for measuring the oil level has a HOT (automatic transmission of the automatic transmission) according to the temperature state of the automatic transmission. When the temperature is high) and COO
L (when the temperature of the automatic transmission is low) is instructed, and the lower end of the oil level gauge 4 is limited to the center of the opening of the oil port 3A of the tube 3 due to the shape of the tube 3. It was For this reason, the range that can be measured by the oil gauge 4 is only above the amount A of the arrow in the figure.

[Problems to be Solved by the Invention] In the above-mentioned measurement, even when an appropriate amount of oil is contained in the oil pan 2, the temperature of the oil varies depending on the temperature of the outside air before or immediately after the automatic transmission is started in cold weather. Since the oil level is low, the oil level may drop below the COOL position of the oil level gauge 4, and may even drop to a position where the oil level gauge 4 does not reach, making it difficult to measure the oil.
In that case, if you mistakenly think that the amount of oil is not appropriate when you measure the oil level, you may replenish the oil, and it may not be possible to maintain the appropriate oil level when the automatic transmission temperature is high (HOT position). There was also.

Therefore, the present invention makes it possible to measure the oil level even in cold weather or at a position where the oil level is low immediately after the automatic transmission is started, and to maintain an appropriate oil level in the vehicle automatic transmission oil. It is intended to provide a level measuring mechanism.

[Means for Solving Problems] For that purpose, the oil level measuring mechanism for an automatic transmission for a vehicle according to the present invention is attached to a lower portion of a transmission case, and includes a side surface portion and a bottom plate portion, and an automatic gear shift is internally provided. An oil pan for storing machine oil, a tube that is attached to the side surface of the oil pan and connects the inside and outside of the oil pan, and an oil that is inserted into the tube and measures the amount of oil in the tube In an oil level measuring mechanism including a level gauge, a side surface of the oil pan has a mounting surface inclined downward, an oil port and a bent portion formed in the tube, and the mounting surface of the tube. The oil port is fixed at a substantially right angle, the lowermost position of the bent portion of the tube is below the lower end of the oil port opening into the oil pan, and the same as the bottom plate part of the oil pan. It is characterized in that it is provided so that it is placed.

[Operation and Effect of the Invention] With the above-described configuration, the oil level measuring mechanism of the automatic transmission for a vehicle of the present invention secures the tube to the mounting surface in which the side surface of the oil pan is tilted downward, and fixes the bent portion of the tube. Since the lowest position is below the lower end of the oil port opening in the oil pan and at the same position as the bottom plate part of the oil pan, the oil is not drawn from the oil port opening in the oil pan to the bent part of the tube. As the oil flows in, the oil level gauge inserted in the tube reaches the bent portion of the tube, so the oil temperature immediately after the automatic transmission is started during cold weather when the oil level is below the COOL position. Oil levels can be measured even at low temperatures. Therefore, when measuring the oil level, there is no misunderstanding that the amount of oil is not appropriate, and when the temperature of the automatic transmission is high (HOT position)
The proper oil level can be maintained. Further, by adopting the above configuration, the oil level in the oil pan can be measured without changing the ground clearance of the vehicle.

[Embodiment] Next, an oil level measuring mechanism of an automatic transmission for a vehicle of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a sectional view of an oil level measuring mechanism of an automatic transmission for a vehicle of the present invention, and FIG. 2 is a sectional view of an automatic transmission of a vehicle to which the oil level measuring mechanism of an automatic transmission for a vehicle of the present invention is applied. Show.

The automatic transmission 100 includes a hydraulic torque converter 200, a transmission 300, and a hydraulic control device 400.

The transmission 300 includes an overdrive transmission 300A having a first planetary gear unit U0, one multi-disc clutch C0 operated by a hydraulic servo, one multi-disc brake B0, and one one-way clutch F0, and a second planetary gear unit. Gear device
U1, third planetary gear unit U2, two multi-plate clutches C1, C2 operated by hydraulic servos, one belt brake B1,
It is composed of two multi-plate brakes B2, B3 and an underdrive transmission 300B having three forward gears and one reverse gear provided with two one-way clutches F1, F2.

The transmission case 1 of the automatic transmission 100 is the torque converter 2
Torque converter housing 120 accommodating 00, overdrive transmission 300A and underdrive transmission 30
A transmission case 130 integrally formed with each chamber for housing 0B and an extension housing 140 that covers the rear side of the automatic transmission 100. These torque converter housing 120 and transmission case 1 are provided.
The 30 and the extension housing 140 are fastened with a large number of bolts.

The torque converter 200 is housed in a torque converter housing 120 whose front (engine side) is open, and is rotated by a front cover 20 that is driven by an engine (not shown) to rotate.
1, an annular plate-shaped rear cover 202 welded to the inner circumference of the front cover 201, a pump impeller 203 provided around the inner wall of the inner wall surface of the rear cover 202, and a turbine arranged to face the pump impeller 203 Runner 204, the turbine runner 2
Turbine shell 205 holding 04, one-way clutch 2
The stator 208, which is supported by the fixed shaft 207 connected to the transmission case 1 via 06, increases the torque capacity when the input speed is low, the front front cover 201, and the turbine shell.
Direct coupling clutch (lock-up clutch) that rotates the front cover 201 and turbine shell 205 in the same direction with 205
It has 209. Front torque converter housing 120
A cylindrical transmission case 130 that is continuous behind
Between the torque converter housing 120 and the torque converter housing 120 is housed an internal gear oil pump 150 having an external gear 150a and an internal gear 150b therein, and an oil pump housing having a cylindrical portion 151 protruding forward on the inner circumference. 152 is fastened to the front of the transmission case 130, and the extension member 210 connected to the inner peripheral end of the rear cover 202 is spline-fitted to the inner periphery of the external gear 150a via the inner periphery of the tubular portion 151. There is. Further, on the rear side of the oil pump housing 152, the tubular portion 151
Cylindrical front support 15 that is coaxial with and projects rearward
The oil pump cover 154 having three parts is fastened, and the oil pump housing 152 and the oil pump cover 154 form a partition wall between the torque converter housing 120 and the transmission case 130. In the middle of the transmission case 130, the overdrive transmission 3
A cylindrical support portion 13 protruding rearward that partitions an overdrive mechanism chamber 130A in which 00A is formed and an underdrive mechanism chamber 130B in which an underdrive transmission 300B is formed.
A center support 132 having one is provided. At the rear part (right side in the figure) of the transmission case 130, there is a rear support wall 1 having a cylindrical rear support 133 protruding forward.
34 are provided.

Inside the front support 153, the torque converter 2
Fixed shaft of one-way clutch 206 supporting stator 208 of 00
A torque converter 207 is fitted inside the fixed shaft 207.
The input shaft 10 of the transmission 300, which is the output shaft of 200, is rotatably supported. The input shaft 10 has a flange portion 101 at the rear end portion, and a rearward facing hole 102 is formed at the center of the rear end portion. An intermediate transmission shaft 11 arranged in series with the input shaft 10 is rotatably mounted behind the input shaft 10.
The intermediate transmission shaft 11 has its tip slidingly contacting the hole 102 of the input shaft 10, has a flange portion 111 at the rear end portion of the intermediate transmission shaft 11, and has an output shaft 12 for transmitting power to the drive wheel side at the center. Is formed with a rearward facing hole 112 in which the tip of the slide contact. Output shaft 12
In the extension housing 140, a sensor rotor 121 for detecting the number of rotations and a speedometer drive gear 122 are fixed, and a rear end portion is provided with a spline groove 123 on the outer periphery for externally fitting a sleeve yoke for transmitting power to the drive wheel side. It is formed and is rotatably supported by the extension housing 140 via the sleeve yoke, and the front end is rotatably supported in the hole 112 of the intermediate transmission shaft 11.

The overdrive transmission 300A is provided with a first planetary gear unit U0 behind the input shaft 10, its ring gear R0 is coupled to the intermediate transmission shaft 11 via a flange plate 113, and the planetary carrier P0 is connected to the input shaft 10. The sun gear S0 is connected to the flange part 101 of the
It is formed by 13. On the front side of the first planetary gear unit U0, a first hydraulic servo drum 14 opening rearward is fixed to the inner race shaft 13, and an annular piston 15 is provided between an outer peripheral wall 14A and an inner peripheral wall 14B of the first hydraulic servo drum 14. Is engaged to form the hydraulic servo C-0 of the clutch C0 that engages and disengages the carrier P0 and the first hydraulic servo drum 14, and the annular piston 15 is provided on the inner race shaft 13 side.
A clutch C0 is mounted inside the return spring 16 and the outer peripheral wall 14A that are pressed toward the −0 side, and the first hydraulic servo drum 14, the inner race shaft 13 and the carrier P0 are connected via the clutch C0. A one-way clutch F0 having an inner race shaft 13 as an inner race is provided on the inner circumference of the first hydraulic servo drum 14, and an outer race 17 is provided on the outer circumference thereof.
The clutch C0 and the brake B0 are provided between the transmission 18 and the transmission case 130, and the piston 18 that presses the brake B0 in front of the center support 132 behind the brake B0 is provided.
Is inserted into the piston 18 and the center support 132 to form a hydraulic servo B-0 of the brake B0, and a return spring for pressing the piston 18 to the hydraulic servo B-0 side on the front end inner peripheral portion 135 of the center support 132. 19 is inlaid.

In the underdrive transmission 300B, first, the second hydraulic servo drum 20 that opens to the rear is provided at the center support 13
The outer peripheral wall is rotatably fitted to the outer periphery of the second support 131.
An annular piston 21 for pressing the clutch C2 is fitted between 20A and the inner peripheral wall 20B to form a hydraulic servo C-2 of the clutch C2 between the annular piston 21 and the second hydraulic servo drum 20 and to the inner peripheral wall 20B side. Hydraulic servo C-
A clutch C2 is mounted inside the return spring 22 and the outer peripheral wall 20A that are pressed to the 2 side. Behind the second hydraulic servo drum 20, there is provided a third hydraulic servo drum 24 having an annular projection 23 at the front and having an opening at the rear, and the intermediate transmission shaft 11
Is fixed to the outer periphery of the flange portion 111 at the rear portion of the intermediate transmission shaft 11 and the outer peripheral wall 24A of the third hydraulic servo drum 24.
The annular piston 25 for pressing the clutch C1 is fitted between the annular piston 25 and the outer periphery of the flange portion 111, and the hydraulic servo C-1 of the clutch C1 is provided between the annular piston 25 and the third hydraulic servo drum 24.
To form an annular piston 25 on the inner peripheral side of the clutch C1.
And the return spring 2 that presses the hydraulic servo C-1 side
6, further clutch C2 is attached to the outer periphery of the annular protrusion 23,
The second and third hydraulic servo drums 20 and 24 are connected via the clutch C2. Behind the third hydraulic servo drum 24, a second planetary gear unit U1 is provided, and its ring gear R1
Is an annular protrusion provided in front of a rotation support member 27 that rotatably supports the ring gear R1 on the outer circumference of the output shaft 12.
28 and a clutch C1 are connected to the third hydraulic servo drum 24, the carrier P1 is spline-fitted to the front end of the output shaft 12, and the sun gear S1 is a sun gear shaft rotatably provided on the outer periphery of the output shaft 12. It is integrally formed at the tip of 29. Also, the second and third hydraulic servo drums 20 and 24 and the second
The connecting drum 30 molded so as to cover the planetary gear unit U1 in the minimum space has the second hydraulic servo drum at the front end thereof.
A belt brake B1 is fixed to the outer circumference of 20, and the rear end is connected to the sun gear shaft 29 at the rear side of the second planetary gear unit U1, and the belt brake B1 for fixing and releasing the connecting drum 30 is provided on the outer circumference side.

The spline 136 formed on the inside of the transmission case 130 includes the brake plate b of the brake B2 on the front side.
2. The brake plate b3 of the brake B3 is spline-fitted to the rear side, and the fourth hydraulic servo drum 32 having an annular protrusion 31 on the front side is opened to the front between the brakes B2 and B3. Has been done. An annular piston 33 that presses the brake B2 is fitted between the outer peripheral wall 32A and the annular protrusion 31 of the fourth hydraulic servo drum 32, and the annular piston 33
A hydraulic servo B-2 of the brake B2 is formed between the fourth hydraulic servo drum 32 and the fourth hydraulic servo drum 32, and a return spring 34 for pressing the annular piston 33 to the hydraulic servo B-2 side is provided on the inner peripheral wall 32B side. A one-way clutch F1 having a sun gear shaft 29 as an inner race is provided on the inner circumference side of the brake B2, and the brake B2 is attached to the outer circumference of the outer race 35. A plurality of pistons 371, 373 for pressing the brake B3 and a reaction sleeve 372 are fitted into an annular hole 36 formed between the outer side of the rear support 133 of the rear support wall 134 of the rear side of the brake B2 and the transmission case 130 to brake. A return spring 38 that forms a hydraulic servo B-3 of B3 and presses the pistons 371 and 373 toward the hydraulic servo B-3 is supported by a return spring attachment 381 attached to the tip of the rear support 133. Inner race of one-way clutch F2 arranged on the inner circumference of brake B3
39 is connected to the fourth hydraulic servo drum 32 on the outer circumference of the sun gear shaft 29, and the brake B3 is mounted on the outer circumference of the outer race 40 of the one-way clutch F2. The third planetary gear unit U2
The sun gear S2 is formed integrally with the sun gear shaft 29,
P2 is connected to the outer race 40 of the front one-way clutch F2 and is also connected to the brake B3, and a ring gear R2 having a parking gear 41 provided on the outer circumference is connected to the output shaft 12 by a connecting member 42 having an inner circumference fitted with a spring. Are connected through. The parking gear 41 is provided so that the parking claw 43 meshes with the parking gear 41 and fixes the output shaft 12 when the shift lever of the automatic transmission is selected to the parking (P) position.

In the lower part of the transmission case 130 of the transmission case 1, the valve body 401 of the hydraulic control device 400 is built in, and the hydraulic oil used in the hydraulic control device 400 and the lubricating oil for lubricating the inside of the transmission 300 are provided inside. An oil pan for storing the oil is fastened by a bolt 402 and attached. The oil pan 2 is composed of a flange portion 2A, a side surface portion 2B and a bottom plate portion 2C.
2A is fastened to the lower surface of the transmission case 130 by a bolt 402 via an oil packing (not shown) so as to prevent the oil in the oil pan 2 from leaking to the outside. In addition, inside the oil pan 2, the valve body 401
And an oil strainer 403 is provided.

As shown in FIG. 1, FIG. 3 and FIG. 4, a side surface 2B of the oil pan 2 is formed with a mounting surface 2E inclined downward,
A tube 3 that connects the inside and the outside of the oil pan 2 is attached to the attachment surface 2E. An oil level gauge 4 for measuring the amount of oil in the tube 3 is inserted into the tube 3, and the oil level gauge 4 has a HOT level and a COOL.
The level is displayed. The tube 3 has an oil port 3A that opens in the oil pan 2, a gauge insertion port 3B into which the oil level gauge 4 is inserted, and a bent portion that is bent to position the gauge insertion port 3B above the oil port 3A. R and are formed.

The mounting surface 2E formed on the oil pan 2 is provided with a mounting hole 2D into which the tube 3 is inserted.
A flange-shaped connecting flange 3C is attached to the outer circumference on the 3A side.
The oil port 3A is inserted into the mounting hole 2D of the mounting surface 2E, and the both are fixed by welding between the mounting surface 2E and the connecting flange 3C via the O-ring 3D. At this time, the lowermost position of the bent portion R of the tube 3 is below the lower end of the oil port 3A opening in the oil pan 2 and above the lowermost position of the oil pan 2, that is, above the bottom plate portion 2C. It is provided in. The reason why the lowermost position of the bent portion R of the tube 3 is provided above the bottom plate portion 2C is to prevent contact with the road surface. As a result, the range that can be measured by the oil level gauge 4 is the amount of arrow B in the figure.
It can be measured to the upper position and sufficiently lower position.

The hydraulic control device 400 built in the oil pan 2 uses the hydraulic pressure that is selectively output to the hydraulic servo of each friction engagement device according to the vehicle running conditions such as vehicle speed and throttle opening.
Engagement and disengagement of each clutch and brake,
It is adapted to perform four forward gear shifts or one reverse gear shift. Table 1 shows an example of the operation of each clutch, brake, and one-way clutch and the achieved shift speed (RANGE).

In Table 1, E indicates that the corresponding clutch and brake are engaged. A cross indicates that the corresponding clutch and brake are released. L is engaged in the corresponding one-way clutch engine drive state,
The engagement indicates that the transmission of power is ensured by a clutch or a brake installed in parallel therewith, so that the engagement is not necessarily required (lock). (L) indicates that the corresponding one-way clutch is engaged only in the engine drive state and is not engaged in the engine brake state. Further, f indicates that the corresponding one-way clutch is free.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing an oil level measuring mechanism for an automatic transmission for a vehicle according to the present invention, and FIG. 2 is an application of the oil level measuring mechanism for an automatic transmission for a vehicle according to the present invention. FIG. 3 is a side sectional view of an automatic transmission for a vehicle, FIG. 3 is a side view of an oil pan and a tube, and FIG. 4 is a bottom view of an oil pan and a tube.
FIG. 5 is a front sectional view showing a conventional oil level measuring mechanism of an automatic transmission for a vehicle. In the figure, 1 ... Transmission case, 2 ... Oil pan, 2A ... Flange portion, 2B ... Side portion, 2C ... Bottom plate portion, 2D ... Tube mounting hole,
2E ... Mounting surface, 3 ... Tube, 3A ... Oil port, 3B ... Gauge insertion port, 3C ... Connecting flange, 3D ... O ring, 4 ... Oil level gauge, R ... Bent part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Hamano 1 Toyota-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Akira Hoshino 1-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (56) References: 58-60525 (JP, U)

Claims (1)

[Claims] 1. Attached to a lower portion of a transmission case,
An oil pan consisting of a side surface part and a bottom plate part for storing oil for an automatic transmission inside, a tube attached to the side surface part of the oil pan and connecting the inside and outside of the oil pan, and inserted into the tube In the oil level measuring mechanism including an oil level gauge for measuring the amount of oil in the tube, a mounting surface in which a side surface portion of the oil pan is inclined downward, an oil port and a bent portion formed in the tube are provided. And fixing the oil port of the tube to the mounting surface at a substantially right angle, and the lowermost position of the bent portion of the tube is below the lower end of the oil port opening into an oil pan, and An oil level measuring mechanism for an automatic transmission for a vehicle, which is provided at the same position as a bottom plate portion of an oil pan.