JPH0621632B2 - Transmission case for vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle transmission case including a main transmission and a power transmission mechanism operated by hydraulic pressure supplied from the main transmission.

(Prior Art) Conventionally, a vehicle transmission case supports a main transmission case that is a first case that houses a hydraulic power source and a transmission mechanism, an output shaft of the transmission mechanism, a governor valve, a speed sensor, and the like. Is provided with a rear case such as an extension housing, and the rear case is connected to a joint wall portion at the rear end of the main transmission case.

FIG. 6 is a front view of a conventional vehicle transmission case.

In the figure, a main transmission case 15 has a cylindrical portion 13 for accommodating a transmission mechanism. In the transmission mechanism,
A friction engagement element is actuated by a hydraulic servo to fix a component of the planetary gear set to a fixed member or to connect an input shaft, an output shaft or other components.

The main transmission case 15 has a cylindrical portion 13 for accommodating a speed change mechanism and a control device chamber 12 located below the cylindrical portion 13 for accommodating control devices such as a parking control device and a hydraulic control device. is doing. And, the main transmission case 1
The rear end joint wall portion of 5 comprises a side wall 14 and a bottom wall 16. Oil such as lubricating oil supplied from the main transmission case 15 to the rear case is provided in the joint wall portion of the main transmission case 15. An oil return oil passage 17 for returning to the side is provided.

When a transfer case, which is a second case accommodating a power transmission mechanism such as an auxiliary transmission or a two-wheel drive / four-wheel drive switching mechanism, is connected between the main transmission case 15 and the rear case, the power transmission is performed. Lubricating oil needs to be supplied to the sliding parts of the components of the mechanism, and if the power transmission mechanism includes a hydraulic servo, hydraulic oil for the hydraulic servo must be supplied. The amount of oil supplied from 15 increases.

(Problems to be Solved by the Invention) However, in the vehicle transmission case having the above configuration, the oil return oil passage 17 is provided in the main transmission case 15.
Since it is provided on the joining wall portion at the rear end, the width cannot be increased and the flow passage area becomes small.

Therefore, a sufficient amount of oil cannot be returned to the main transmission case 15 side. As a result, the oil level in the transfer case increases, and the frictional engagement element of the power transmission mechanism agitates the lubricating oil to raise the oil temperature or reduce the power transmission effect.

The present invention solves the above-mentioned problems of the conventional vehicle transmission case and optimizes the oil level in the transfer case that houses the power transmission mechanism, and the power transmission mechanism agitates the lubricating oil to increase the oil temperature. It is an object of the present invention to provide a vehicular transmission case capable of preventing the oil pressure from rising and stabilizing the oil level in the transmission mechanism.

(Means for Solving Problems) Therefore, in the vehicle transmission case of the present invention,
A hydraulic pressure source, a speed change mechanism, a first case accommodating the hydraulic pressure source and the speed change mechanism, a power transmission mechanism connected to an output side of the speed change mechanism, and a second case accommodating the power transmission mechanism. Have The second case is adapted to receive the supply of oil from the hydraulic source via the first case.

The first case has a cylindrical portion for accommodating the speed change mechanism, and the second case is provided on a rear end surface of the cylindrical portion and below the rear end surface.
Forming a joint wall portion for connecting the cases.

The joining wall portion has a substantially rectangular portion formed of a side wall and a bottom wall, and an overhang portion formed outside the substantially rectangular portion and formed of the side wall and the bottom wall, and the oil return oil is provided on the overhang portion. Forming a road.

(Operation and Effect of the Invention) According to the present invention, the first case housing the hydraulic power source and the speed change mechanism as described above, the power transmission mechanism connected to the output side of the speed change mechanism, and the power transmission mechanism Second to store
Has a case of. The second case receives the supply of oil from the hydraulic pressure source via the first case.

The first case has a cylindrical portion for accommodating the speed change mechanism, and the second case is provided on a rear end surface of the cylindrical portion and below the rear end surface.
Forming a joint wall portion for connecting the cases.

The joining wall portion has a substantially rectangular portion formed of a side wall and a bottom wall, and an overhang portion formed outside the substantially rectangular portion and formed of the side wall and the bottom wall, and the oil return oil is provided on the overhang portion. Forming a road.

Therefore, the flow passage area of the oil return oil passage can be increased, and moreover, the oil return oil passage can be arranged at a low position, so that the amount of oil returned can be promoted and the oil in the second case can be reduced. The level can be optimized.

Then, since the oil level in the second case is optimized, the oil is not agitated by the friction engagement element that constitutes the power transmission mechanism in the second case, and the oil temperature rises. To be prevented. Furthermore, the oil level in the speed change mechanism can be stabilized.

(Example) Hereinafter, the Example of this invention is described in detail, referring drawings.

1 to 5 are views showing an automatic transmission case for four-wheel drive adopted in a transmission case for a vehicle according to the present invention.

The vehicle transmission case 1 is a transmission case in which a fluid transmission device case 2 and an oil pan 30 are fastened to the lower surface.
An extension case in which an automatic transmission case 4 which is a first case including 3 and an oil pan 50 is connected to the lower surface
5, a four-wheel drive, a second output shaft 61 connected to the output shaft of the transmission, a front transmission mechanism case 6, a rear transmission mechanism case 7 projecting leftward from the lower part in the drawing, and a first transmission shaft which is always connected to the output shaft of the transmission The transfer case 9 is a second case provided with an extension housing 8 having an output shaft 81 protruding from the rear portion, and these cases are connected by a large number of bolts.

The fluid transmission device case 2 accommodates a well-known fluid transmission device such as a torque converter or a fluid coupling, a clutch, and an oil pump serving as a hydraulic pressure source.

The transmission case 3 is operated by a planetary gear set and a hydraulic servo (not shown), and a friction engagement brake that fixes the components of the planetary gear set to the transmission case 3, a friction coupling that connects an input shaft, an output shaft or other components. A cylindrical portion 31 for accommodating a planetary gear speed change mechanism including an engagement clutch, and the cylindrical portion 31
Is a control device chamber that is located below the cylindrical part 31 and is integrally molded with the cylindrical part 31 at the time of casting, is surrounded by both side walls 331 and a bottom wall 322, and stores a control device such as a parking control device and a hydraulic control device. The upper portion 341 has a smaller diameter than the shape portion 33 and both side walls 331 located on the side of the substantially rectangular portion 33, and the lower portion 342 has a smaller diameter.
Has a large diameter and is integrally molded with the cylindrical portion 31 at the time of casting, and the skirt-shaped projecting portion 34 composed of the outer wall 344, the inclined wall (344) and the bottom wall 345, and the transfer case 9 at one end 3A thereof. And a joint wall portion 39 that connects the transmission case to the outer peripheral wall portion 35 of the cylindrical portion 31.
The bolt fastening holes 36A, 36B, 36C, 36D, 36E of the bolts fastening the 3 and the extension case 5 with the built-up portions 36a, 36
b, 36c, 36d, 36e and both side walls of the substantially rectangular portion 33
A bolt fastening hole 37 is formed in the bottom wall 322 of the 331, and a fastening hole 38A is formed in the built-up portion 323A of the central portion 323 of the bottom wall 322 of the substantially rectangular portion 33.
A bolt fastening hole 38B is formed in the built-up portion 343 of the lower portion 342 of both inclined walls 344 of the skirt-shaped projecting portion 34. On the lower surfaces of the substantially rectangular portion 33 and the skirt-shaped overhanging portion 34, an automatic transmission hydraulic control device for selectively supplying / discharging hydraulic oil to / from the friction engagement brake of the automatic transmission and the hydraulic servo of the clutch is provided inside. An automatic transmission oil pan 30 for housing the automatic transmission valve body is fastened.

The joint wall portion 39 has an oil return oil passage 32, which is a return oil passage, on the skirt-shaped projecting portion 34.
32 is a cylindrical oil passage hole 32A integrally formed in the axial direction by casting or drilling in the skirt-shaped projecting portion. In this embodiment, the oil level of the transfer case 9 is as shown in FIG. , Transfer case 9
It is possible to optimize the oil level of the brake B
4. Prevents oil temperature rise due to oil agitation of the clutches C3 and C4, and stabilizes the oil level of the automatic transmission case 4.

As shown in FIG. 3, the extension case 5 has a cylindrical end portion 51 for housing the friction engagement brake B4 and the clutch C3 of the four-wheel drive transfer 100, which is a power transmission mechanism. Top
521 has a small diameter, the lower surface 522 has a large diameter, and is integrally molded with the cylindrical portion 51 during casting, and is formed of an inclined wall 52 and a bottom wall 53 on the outer peripheral wall portion 54 of the cylindrical portion 51. Bolt fastening holes 55A, 55B, 55C, 55 formed at positions corresponding to the bolt fastening holes 36A, 36B, 36C, 36D, 36E of 3
Forming D and 55E, the lower surface 522 of the inclined wall 52 and the central portion 5 of the bottom wall 53
31 to the bolt fastening hole 38 of the transmission case 3
Bolt fastening holes 56A, 56B, 56C are formed at positions corresponding to A, 38B. The transfer case 9 is firmly connected to the transmission case 3 by bolts through these bolt fastening holes, and a sufficient joint strength that can withstand rough road travel is obtained. On the lower surface of the extension case 5, a transfer oil for accommodating a transfer valve body is provided, which is internally provided with a hydraulic control device of a transfer for selectively supplying and discharging hydraulic oil to a hydraulic engagement brake of the transfer case 9 and a hydraulic servo of a clutch. Bread 50 has been signed. As shown in FIG. 5, the four-wheel drive transfer 100 is provided with an extension case 5 which is a cylindrical front case, and a side wall 300 is provided inside the extension case 5.
Is fixed. The other side (input side) surface 30 of the side wall 300
An annular hydraulic cylinder 133 of the hydraulic servo B-4 of the brake B4 is formed on a, and a center support portion 320 including a tubular boss portion 350 is formed on one (output side) surface 30b. Thus, the first output shaft 81 is rotatably supported. The center support portion 320 rotatably supports a clutch C4 for switching between two-wheel drive and four-wheel drive.

An output shaft 132 of a planetary gear transmission (not shown) of the automatic transmission in the transmission case 3 is housed as an input shaft in the extension case 5 in front of the side wall 300. A planetary gear set Pf, a clutch C3 and a brake B4 are provided between the input shaft (132) and the first output shaft 81 of the transfer 100 arranged in series with the input shaft (132). A gear transmission 140 is provided. Further, reference numeral 151 denotes a sleeve rotatably fitted around the first output shaft 81, and 61 denotes a second sleeve which is arranged in parallel with the input shaft (132) and is installed in the opposite direction to the first output shaft 81. The output shaft 153 is a transmission mechanism between the sleeve 151 and the second output shaft 61.

The planetary gear set Pf includes a sun gear 144 spline-fitted to the end of the input shaft (132), and the sun gear 14
4, a planetary pinion 145 that meshes with the planetary pinion 145, a ring gear 146 that meshes with the planetary pinion 145, and a carrier 147 that rotatably supports the planetary pinion 145 and is connected to the tip of the first output shaft 81 of the transfer 100. .

The clutch C3 is arranged on the other side (input side) of the planetary gear set Pf, and connects and disconnects the sun gear 144 and the carrier 147. The clutch C3 is provided in the annular hydraulic cylinder 150 and the annular hydraulic cylinder 150 connected to the carrier 147. It is operated by a hydraulic servo C-3 configured with the mounted piston 150P.

In the annular hydraulic cylinder 150, a parking gear 150a is provided around the outer peripheral side 150A, and when the shift lever of the automatic transmission is selected to the parking position, the pawl meshes with the parking pawl (not shown) to fix the first output shaft 81. .

The brake B4 is composed of a multi-plate friction brake for engaging the ring gear 146 with the extension case 5, and has an annular hydraulic cylinder 133 formed in the extension case 5 and a piston 133P mounted in the annular hydraulic cylinder 133. Hydraulic servo B-4
Operated by.

The clutch C4 is the first output shaft 8 connected to the carrier 147.
1 and a sleeve 151 connected to one sprocket 156 of the transmission mechanism 153 for driving the second output shaft 61 of the transfer 100. The multi-plate friction clutch is rotatably supported by the transfer case 9. Annular hydraulic cylinder 144 and the annular hydraulic cylinder 14
4 is operated by a hydraulic servo C-4 constituted by a piston 144P mounted in The transmission mechanism 153 is
Sprocket 1 spline-fitted to the sleeve 151
56, the sprocket 155 formed on the second output shaft 61
And a chain 157 stretched between these sprockets 156 and 155.

160 is a hydraulic servo C-3, C-4 of the clutch C3, the clutch C4 and the brake B4 of the transfer 100.
B-4 is a transfer valve body provided with a hydraulic control device for supplying and discharging hydraulic pressure, and 161 is an oil pan thereof. Clutch C3, clutch C4 and brake B4
The oil supplied to the hydraulic servos C-3, C-4, B-4 of the transfer control device 1 is transferred through the oil passage 164 provided in the transmission case 3 and the transfer case 2.
It is guided to a transfer valve body 160 provided with 63.

During normal running, the line pressure supplied to the hydraulic control device of the automatic transmission is supplied to the hydraulic servo C-3 via the oil passage 165 to engage the deceleration clutch C3, and the hydraulic servos B-4 and C-4 are operated. The pressure is discharged to release the brake B4 and the clutch C4. As a result, the sun gear 144 and the carrier 147 of the planetary gear set Pf are connected, and the power is input to the input shaft (13
2) is transmitted to the first output shaft 81 with a reduction ratio of 1
Wheel drive is obtained. At this time, the power from the input shaft (132) does not pass through the sun gear 144, the planetary pinion 145, and the ring gear 146 but through the reduction clutch C3 and the carrier 1
Since it is transmitted from 47 to the first output shaft 81, the tooth surface of each gear is not loaded, and the life of the gear is increased. During this two-wheel drive traveling, when four-wheel drive traveling is required, a shift lever (not shown) provided in the driver's seat or the like is operated to gradually increase the line pressure to the hydraulic servo C-4 of the transfer control device 163. To smoothly engage the clutch C4,
The first output shaft 81 and the sleeve 151 are connected to each other, and the power is transmitted to the front wheels via the transmission mechanism 153, the second output shaft 61 and the propeller shaft (not shown), and the input shaft (13
From 2), power is transmitted to the first output shaft 81 and the second output shaft 61 at a reduction ratio of 1, and a four-wheel drive direct drive traveling state (high speed 4
Wheel drive state) is obtained. If the shift lever is operated when it is necessary to increase the output torque on a steep slope during this four-wheel drive traveling, the switching valve between the high-speed four-wheel drive state and the low-speed four-wheel drive state is operated, and the hydraulic servo B-4 The line pressure is gradually supplied to the hydraulic servo C-3 at a proper timing, and the hydraulic pressure of the hydraulic servo C-3 is discharged to gradually engage the brake B4 and smoothly disengage the clutch C3. As a result, the sun gear 144 and the carrier 147 are released, the ring gear 146 is fixed, and the power is transmitted to the input shaft (1
32) to Sun Gear 144 and Piraneta Pinion 14
5, the speed is reduced via the carrier 147 and is transmitted to the first output shaft 81 and the second output shaft 61.
A wheel drive traveling state (low speed four-wheel drive state) is obtained. Table 1
Setting range of manual shift of transfer 100, brake B4, deceleration clutch C3 and two-wheel / four-wheel switching clutch C
4 shows the engagement and disengagement of 4 and the running state of the vehicle.

In Table 1, ∘ indicates the engaged state of the friction engagement element, and × indicates the released state. The reduction ratio (3.0 in the example) is a reduction ratio = (1 + λ) / λ = when the tooth ratio of the sun gear 144 and the ring gear 146 of the planetary gear mechanism is λ and the tooth ratio λ is 0.5.
It is calculated by 3.0.

FIG. 4 is a side view of a second embodiment of the vehicle transmission case of the invention.

In this embodiment, the transmission case 3 connected to the transfer case 9 is provided with a cylindrical portion 31, a control device chamber 330 located below the cylindrical portion 31, and projecting from both side surfaces of the control device chamber 330. And a rectangular oil return hole 37B inside the protruding portion 36.
, Is integrally formed at the time of molding by casting,
In this embodiment, the oil level in the transmission case 2 is as shown in B of the figure.

[Brief description of drawings]

FIG. 1 is a side view of a four-wheel drive transmission case incorporating the vehicle transmission case of the present invention, FIG. 2 is a front view of a first embodiment of the vehicle transmission case of the present invention, and FIG. The front view of the extension housing of the transfer case fastened to the vehicle transmission case of the present invention, FIG. 4 is a side view of the second embodiment of the vehicle transmission case of the present invention, and FIG. 5 is a side view of the transfer case. A sectional view and FIG. 6 are front views of a conventional vehicle transmission case. 1 ... Vehicle transmission case, 2 ... Fluid transmission device case, 3 ... Transmission case, 4 ... Main transmission case, 5 ... Extension case, 7 ... Transfer cover, 8 ... Extension housing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Watanabe 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Yoshiharu Harada, 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (56) References Actual development Sho 55-73539 (JP, U) Actual development Sho 58-138855 (JP, U) Actual development Sho 57-73455 (JP, U)

Claims (3)

[Claims] 1. A hydraulic power source, a speed change mechanism, a first case for accommodating the hydraulic pressure source and the speed change mechanism, a power transmission mechanism connected to an output side of the speed change mechanism, and the power transmission mechanism. In addition, in a vehicle transmission case including a second case that receives oil supply from the hydraulic pressure source through the first case, the first case has a cylindrical portion that houses the transmission mechanism. A connecting wall portion for connecting the second case is formed on the rear end surface of the cylindrical portion and below the rear end surface, and the connecting wall portion has a substantially rectangular portion including a side wall and a bottom wall; A transmission case for a vehicle, characterized in that it has an overhanging portion formed on the outer side of the rectangular portion and is composed of a side wall and a bottom wall, and an oil return oil passage is formed in the overhanging portion. 2. The oil return oil passage is formed on both sides of the substantially rectangular portion, and the oil return oil passage is formed on the both sides of the substantially rectangular portion. Vehicle transmission case. 3. The transmission case for a vehicle according to claim 1, wherein the power transmission mechanism includes a friction engagement element operated by a hydraulic servo.