JPS6141076A - Transmission case for speed change gear for car - Google Patents

Abstract

PURPOSE:To keep the oil level in a transfer case at a proper level by forming a projection part on the side of the controller chamber of a case for accommodating a speed change mechanism and forming a return-oil passage at the joint wall part of the propulsion part with the case for accommodating a power transmission mechanism. CONSTITUTION:An automatic speed change gear case has a transmission case 3 connected to the rear edge of a fluid transmission apparatus case 2. Said transmission case 3 is formed from a cylindrical part 31 for accommodating a planetary gear speed change mechanism, nearly rectangular-shaped part 33 which is integrally formed under the cylindrical part 31 and serves as controller chamber accommodating a variety of controllers, and a skirt-shaped propulsion part 34 which consists of an inclined wall 344 and a bottom wall 345 and is formed onto the both sides of the rectangular part 33. A connection wall part 39 for connecting a transfer case is formed at the rear edge 3A of the transmission case 3. In this case, a return-oil passage 32 is formed at the joint wall part 39 of the above-described propulsion part 34, and the oil level of the transfer case is kept at the proper position shown by A.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a transmission case for a vehicle transmission that includes a main transmission and a power transmission device operated by hydraulic pressure supplied from the main transmission. .

[Prior art] The transmission case of conventional vehicle transmissions supports the main transmission case, which is the first case that houses the hydraulic power source and the transmission mechanism, and the output shaft of the transmission mechanism. The transmission case includes a rear case such as an extension housing for storing sensors, etc., the rear case is connected to a joint wall at one end of the main transmission case, and the transmission case has a cylindrical part housing a transmission mechanism. and a parking control device located below the cylindrical portion;
It consists of a control equipment room that houses control equipment such as a hydraulic control equipment, and the joint wall of the control equipment room receives oil such as lubricating oil supplied from the main transmission case to the rear case. A return oil passageway was provided to return the oil to the case side.

The main transmission case houses a power transmission mechanism such as an auxiliary transmission mechanism or a two-wheel drive/four-wheel drive switching mechanism.
When connecting power transmission device cases, the lubricating oil supplied to the sliding parts of the components of the power transmission mechanism, or the hydraulic oil if the power transmission mechanism is equipped with a hydraulically operated engagement device, etc. The amount of oil supplied from the transmission case is increased by 1.

[Problems to be Solved by the Invention] In the transmission case of the conventional vehicle transmission having the above structure, it is difficult to maintain a sufficient amount of oil in the return oil passage provided in the joint wall of the control device chamber of the main transmission case. The problem is that the oil level in the power transmission device case becomes high, causing an increase in oil temperature due to oil agitation in the power transmission system, and a decrease in transmission efficiency.

The present invention aims to optimize the oil level in the second case that houses the power transmission mechanism, prevents the oil temperature from rising due to oil agitation of the frictional engagement element next to the second case, and prevents the oil level next to the transmission mechanism. The purpose is to provide a four-wheel drive transformer 71 case that stabilizes the vehicle.

[Means for solving the problems] The transmission case of the vehicle transmission of the present invention has the following features:
a hydraulic power source, a transmission mechanism, a first case housing the hydraulic power source and the transmission mechanism, a power transmission mechanism connected to the output side of the transmission mechanism, and a transmission mechanism from the hydraulic source through the first case. In a transmission case for a vehicle transmission, the transmission case includes a second case that is supplied with oil and that houses the power transmission mechanism, wherein the first case has a cylindrical part that houses the transmission mechanism. a control device chamber located below the cylindrical portion, an overhang portion located on the side of the control device chamber, and a joint wall portion connecting the second case to one end of these, A return oil passage is provided at the joint wall portion of the projecting portion.

[Operations and Effects of the Invention] Due to the above configuration, the transmission case of the vehicle speed change Im of the present invention has the following operations and effects.

b) A cylindrical part that houses the transmission mechanism, a control device chamber located below the cylindrical part, a projecting part located on the side of the control device room, and a second case connected to one end of these parts. Since the return oil passage is located at the joint wall of the overhang, the oil level of the second case is adjusted and the oil agitation of the frictional engagement element on the second case is performed. Can prevent oil temperature from rising.

A second case is connected to the cylindrical part that houses the transmission mechanism, the control device room located below the cylindrical part, and the projecting part located on the side of the control device room. Since the return oil passage is provided at the joint wall of the overhang, the oil level of the transmission mechanism can be stabilized by optimizing the oil level of the power transmission mechanism.

[Embodiment] A transmission case of a vehicle transmission according to the present invention will be explained based on an embodiment shown in the drawings.

FIGS. 1 to 4 show an automatic transmission case for four-wheel drive, which is adopted as a transmission case for a vehicle transmission according to the present invention.

A transmission case 1 of a vehicle transmission includes a fluid transmission device case 2 and an automatic transmission case 4 which is a first case including a transmission case 3 having an oil pan 30 fastened to the bottom surface thereof, and an oil pan 50 on the bottom surface thereof. Connected extension case 5. Front transmission mechanism case 6 with a second output shaft 61 connected to the output shaft of the 4-wheel drive 1-lance transmission projected leftward in the figure from the bottom, rear transmission mechanism case 7, and always 1-lance. It consists of a transfer case 9, which is a second case, which has a first output @ 81 that is connected to the output shaft of the transmission and is equipped with a single tension housing 8 that protrudes from the rear, and each of these cases is connected by a number of bolts. There is.

The fluid transmission device case 2 houses a fluid transmission device such as a well-known torque converter or fluid coupling, a clutch, and a first pump that is a hydraulic power source.

The transmission case 3 is operated by a planetary gear set (not shown) and a hydraulic servo, and includes an engagement brake that fixes the components of the planetary gear set to the transmission case 3, and a friction link that connects the input shaft, output shaft, or other components. A cylindrical part 31 that houses and covers a planetary gear transmission mechanism equipped with a locking clutch, and is located below the cylindrical part 31 and integrally formed with the cylindrical part 31 during casting, and has side walls 331 and a bottom. A substantially rectangular portion 33 that is a control device chamber surrounded by a wall 322 and housing control devices such as a parking control device and a hydraulic control device;
41 is a small diameter, the lower part 342 is a large diameter, and when casting,
Integrated into the cylindrical part 31! The cylindrical portion 31 is made up of a skirt-like projecting portion 34 consisting of an inclined wall (344) d3, which is an outer wall 344, and a bottom wall 345, and a connecting wall portion 39 that connects the transfer case 9 to these -(fiit3A). Bolt fastening holes 36A, 36B, 36C, 36 for bolts that fasten the transmission case 3 and extension case 5 to the outer peripheral wall 35 of the
D, 3GE built-up parts 36a, 36b, 36
c, 36d, '36e, and the substantially rectangular part 3
Bolt fastening holes 37 are formed in the bottom wall 322 of both side walls 331 of No. 3, and the center portion 323 of the bottom wall 322 of the substantially rectangular portion 33 is
A fastening hole 388 is formed in the built-up part 3238 of the skirt-like overhanging part 340 and a bolt fastening hole 38B is formed in the built-up part 343 of the lower part 342 of the slanted wall 344. An automatic transmission hydraulic control device for selectively supplying and discharging hydraulic oil to the friction engagement play 4 of the automatic transmission and the hydraulic servo of the clutch is provided on the lower surface of the substantially rectangular portion 33 and the skirt-like projecting portion 34. An oil pan 30 is connected to the automatic transmission 1 which houses the automatic transmission valve body.

The joint wall portion 39 has an oil return oil passage 32, which is a return oil passage, in the skirt-like overhang portion 34, and the oil return oil passage 32 is integrally formed in the skirt-like overhang portion in the axial direction by casting or drilling. A molded cylindrical oil passage hole 32A is formed, and in this embodiment, the transfer case 9
The oil level is as shown in figure A, which makes it possible to optimize the oil level in the lance case 9, prevent the oil temperature from rising by agitating the oil in the brake B4, clutches C3 and C4, and automatically shift gears. Stabilize the oil level in machine case 5.

As shown in FIG. 3, the end surface of the extension case 5 connected to the transmission case 3 has a cylindrical portion 51 that accommodates the friction engagement brake B4 and clutch C3 of the four-wheel drive transfer 100, which is a power transmission mechanism. The upper surface 521 has a small diameter, the lower surface 522 has a large diameter,
At the time of casting, it is formed integrally with the cylindrical part 51, and the inclined wall 52
and a bottom wall 53, and the outer peripheral wall 54 of the cylindrical portion 51 is provided with the holes 1 to 36 of the transmission case 3.
8, corresponding to 36B, 36C, 36D, 36E, I
[Bolt fastening holes formed at positions 558, 55B,
55C, 55D, and 55E are formed, and bolt fastening holes 56A and 56B are formed on the lower surface 522 of the inclined wall 52 and the center part 531 of the bottom wall 53 at positions corresponding to the bolt fastening holes 38A and 38B of the lance transmission case 3. ,56C
is formed. Transfer case 9 is firmly connected to transmission case 3 by bolts through these bolt fastening holes, and sufficient joint strength is obtained to withstand driving on rough roads. The lower surface of the extension case 5 houses a transfer valve body in which a transfer hydraulic control device for selectively supplying and discharging hydraulic oil to the friction engagement brake and clutch hydraulic servo of the transfer case 9 is installed. Transfer oil pan 50 is fastened. The four-wheel drive transfer 100 is
As shown in FIG. 4, the extension case 21, which is a cylindrical front case, is fixed in the extension case 21, and the other (input side) surface 30a has an annular shape of the hydraulic servo B-4 of the friction brake B4. A hydraulic cylinder 3 is provided, and a cylindrical boss portion 3 is provided on one side (output side in the figure) surface 30b.
1st output @ 142 at the center support part 32 including 5
a friction clutch C4 for switching between two-wheel drive and four-wheel drive, which is rotatably supported by the center support part 32, and a friction clutch C4 rotatably supported by the center support part 32, and a friction clutch C4 for switching between two-wheel drive and four-wheel drive; The input shaft is an output shaft 132 of a planetary gear shift (not shown) which is housed in a transmission case and has an automatic shift mechanism (automatic shift) inside the transmission case.
132) arranged in series with the first output shaft 81 of the Lancer 100. It consists of 140 feelings. Roughly 151 is a four-wheel drive sleeve rotatably fitted onto the first output shaft 81, and 152 is the input @If (1
A second output shaft 153, which is arranged in parallel with 32) and mounted in the opposite direction to the first output shaft 142, is a transmission mechanism between the sleeve 151 and the second output shaft 152.

The planetary gear set Pf includes a sun gear 144 spline-fitted to the end of the input shaft (132), and the ring gear 14.
4, a ring gear 146 that meshes with the planetary pinion 145, and a carrier 147 that rotatably holds the planetary pinion 145 and is connected to the tip of the first output shaft 142 of the transfer 100. Consisting of

The clutch C3 is arranged on the other side (input gear) of the planetary gear set Pf, and is connected to the force gear 144 and the carrier 147.
The annular hydraulic cylinder 150 connected to the Kyrelia 147 and the annular hydraulic cylinder 150
Hydraulic pressure υ consisting of a piston 150p installed inside
-BoC-,3.

The annular hydraulic cylinder 150 is provided with a parking gear 150a around the outer peripheral side 150A, and when the shift lever of the automatic transmission is set to the parking position, the pawl engages with a parking pawl (not shown) to keep the first output shaft 81 in a fixed position.
Ru.

The brake B4 is a multi-disc W friction brake for engaging the ring gear 146 with the extension case 5, and includes an annular hydraulic cylinder 133 formed in the extension case 5, a piston 133P mounted in the annular hydraulic cylinder 3, 122-wheel four-wheel switching clutch C4 gear rear 147 operated by hydraulic servo B-4 consisting of
The second output shaft of the transfer 100 such as the first output shaft 81 connected to
Transmission mechanism 15 for driving the output tllll 152
Sleeve 15 connected to one sprocket 156 of 3
The hydraulic servo C- is a multi-disc friction clutch that connects and disconnects the hydraulic servo C-1, which is composed of an annular hydraulic cylinder 140 rotatably supported by the transfer case 9 and a piston 140P mounted within the annular hydraulic cylinder 140. 4. The transmission geometry 153 includes a sprocket 156 spline-fitted to the sleeve 151, a sprocket 155 formed on the second output shaft 71, and a chain 157 stretched between these sprockets 156 and 155.
Consisting of

160 is a transfer valve body provided with a hydraulic control device that supplies and discharges hydraulic pressure to hydraulic servos C-3, C-4, and Bl of the transfer 100 @speed latch c3.2-wheel/4-wheel switching clutch C4 and brake B4. , 161
is the oil pan. .

Line pressure oil supplied to the hydraulic servos C-3, C-4, and B-4 of the deceleration clutch C3, the two-wheel/four-wheel switching clutch C4, and the brake B4 is supplied to the oil passage 164 provided in the transmission case and transfer case 2. is led to a transfer valve body 160 in which a transfer control tIl device 163 is provided.

During normal driving, 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, and the -C reduction clutch C3 is engaged, and the hydraulic servo C-3 is engaged.
4 and C-4 to release brake B4 and clutch C4. As a result, the ring gear 144 and carrier 147 of the planetary gear set pf are connected,
Power is transferred from the input shaft (132) to the first output shaft 81 at a reduction ratio of 1.
The power is transmitted to the rear wheels, resulting in two-wheel drive driving using only the rear wheels. At this time, the power from the input shaft (132>) is transmitted from the carrier 147 to the first output shaft 142 via the reduction clutch C3 without passing through the ring gear 144, planetary pinion 145, or ring gear 146, so the teeth of each gear There is no load on the surface, increasing the life of the gear.During this 2-wheel drive driving, 4
When wheel drive driving is required, a shift lever (not shown) installed on the driver's seat is manually shifted, and line pressure is gradually supplied to the hydraulic servo C-4 of the transfer control device 163 to drive the 2 wheels and 4 wheels. When the switching clutch C4 is smoothly engaged, the first output shaft 81 and the sleeve 151 are connected, and power is also transmitted to the front wheels via the transmission mechanism 153, the second output shaft 71, and the propeller shaft (not shown). Input shaft (1
32) to the first output shaft 142 and the second output shaft 152 at a reduction ratio of 1, and the four-wheel drive directly coupled driving state (
high-speed four-wheel drive). During this four-wheel drive run,
Use the shift lever when you need to increase the output torque, such as on steep slopes.
When manually shifted, the hydraulic pressure to the hydraulic servo activates the switching valve between high-speed 4-wheel drive state and low-speed 4-wheel drive state, gradually supplies line pressure to hydraulic servo B-4, and switches hydraulic servo C at an appropriate timing. -3 hydraulic pressure is discharged, the brake B4 is gradually engaged, and the deceleration clutch C3 is smoothly released. As a result, sun gear 144 and carrier 147 are released, ring gear 146 is fixed, and the power is decelerated from the input shaft (132) via sun gear 144, planetary pinion 145, and carrier 147 to the first output @1181 and the second output. The torque is transmitted to the output shaft 71, and a four-wheel drive driving state (low-speed four-wheel drive state) with large torque is obtained. Table 1 shows the manual shift setting range of the transfer 100, the engagement and disengagement of the brake B4, the deceleration clutch C3, and the two-wheel/four-wheel switching clutch C4, and the running state of the vehicle.

Table 1 In Table 1, ◯ indicates the engaged state of the original vibration engaging element, and × indicates the released state. The reduction ratio (3.0 in the example) is the reduction I ratio - (1 + λ) when the tooth ratio of the sun gear 144 and ring gear 146 of the free ψ gear mechanism is λ, and the tooth ratio λ is 0.5.
/λ-3,0.

FIG. 5 shows a second embodiment of a transmission case for a vehicle transmission according to the present invention.

In this embodiment, the transmission case 3 connected to the transfer case 1 is molded by casting in one piece, and includes a cylindrical portion 33, a control device located below the cylindrical portion 33, and a control device located below the cylindrical portion 33. An overhanging portion 3G protrudes from both sides of the control device to 35, and a rectangular oil return hole 37B is formed inside the overhanging portion 36.
In this embodiment, the oil level in the transfer case is as shown in Figure B.

[Brief explanation of the drawing]

FIG. 1 is a side view of a four-wheel drive transmission case incorporating a transmission case for a vehicle transmission according to the present invention, and FIG. 2 is a front view of a first embodiment of a transmission case for a vehicle transmission according to the present invention. 3 is a front view of the tension housing of the transmission case of the vehicle transmission of the present invention, FIG. 4 is a side sectional view of the transfer case, and FIG. 6 is a side view of a second embodiment of a transmission case for a vehicle transmission according to the present invention, and FIG. 6 is a front view of a conventional transmission case for a vehicle transmission. In the diagram 1... Four-wheel drive transfer case 2...
・Fluid transmission case 3... Transmission case 4... Main transmission case 5... Extension case 7... Transfer cover 8... Extension housing

Claims (1)

[Scope of Claims] 1) A hydraulic power source, a transmission mechanism, a first case housing the hydraulic power source and the transmission mechanism, a power transmission mechanism connected to the output side of the transmission mechanism, and a power transmission mechanism connected to the output side of the transmission mechanism; In a transmission case for a vehicle transmission, the transmission case includes a second case that is supplied with oil through the first case and that houses the power transmission mechanism, wherein the first case houses the transmission mechanism. A cylindrical part, a control device chamber located below the cylindrical part, an overhang part located on the side of the control device chamber, and a joining wall part connecting the second case to one end of these parts. A transmission case for a vehicle transmission, further comprising a return oil passage in a joint wall of the projecting portion. 2) The vehicle transmission according to claim 1, wherein the projecting portions are disposed on both sides of the control device room, and the return oil passage is provided in the projecting portions on both sides. transmission case. 3) The transmission case for a vehicle transmission according to claim 1, wherein the power transmission mechanism includes a hydraulically operated engagement device.