JPH0686902B2 - Lubrication device for output shaft bearing of automatic transmission for vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output shaft bearing lubrication device for an automatic transmission for a vehicle, in which an output shaft of a transmission mechanism of the automatic transmission is an extension housing of a transmission case. It is intended to lubricate a bearing portion that is rotatably supported.

[Conventional technology]

The output shaft of the speed change mechanism of the automatic transmission for a vehicle is spline-connected to a sleeve yoke connected to a propeller shaft via a universal joint at a free end extending from a transmission case housing the speed change mechanism, It is usual that the extension housing connected to the transmission case is rotatably supported via a sleeve yoke.

The spline connection between the output shaft of the speed change mechanism and the sleeve yoke has been coated with grease, Lubelite treatment, nylon coating or the like in order to reduce sliding resistance.

[Problems to be solved by the invention]

Applying grease to the spline connection between the output shaft of the transmission mechanism of the automatic transmission and the sleeve yoke, Luberite treatment, treatment such as nylon coating, or grease application to the bearing that supports the sleeve yoke in the extension housing, Since this is only done at the time of assembling or repairing the automatic transmission, it is unavoidable that the sliding resistance of the spline connection portion and the bearing increases during continuous use of the vehicle for a long period of time.

The present invention supplies a lubricating fluid during traveling of a vehicle to an output shaft of a transmission mechanism of an automatic transmission in the extension housing, a spline connection portion of a sleeve yoke, and a bearing that supports the sleeve yoke in the extension housing. It is an object to provide a shaft bearing and a lubricating device.

[Means for solving problems]

As illustrated in the drawings, the present invention is directed to a transmission case 22 for accommodating a transmission mechanism of an automatic transmission including a hydraulic control device 23, and a bearing 26 at a free end connected to the transmission case 22. To the outer peripheral portion of the output shaft 3 of the speed change mechanism by an extension housing 4 having a bearing portion 5 for supporting the inner peripheral surface thereof and a spline 63 formed on the inner peripheral surface of the shaft hole 60a. Formed spline
A hub portion 62 that forms a universal joint 69 between a sleeve portion 61 that slidably engages with the 33 in the axial direction and a propeller shaft 70.
And a sleeve yoke 6 supported in the bearing portion 5 of the extension housing 4 by the bearing 26 in the sleeve portion 61 is a basic structure of the automatic transmission for a vehicle. A closing means such as a plug 74 for liquid-tightly closing the shaft hole 60a that engages the output shaft 3 of the mechanism on the hub 62 side from the end of the output shaft 3, and the output shaft 3 of the transmission mechanism. An oil passage 72 that is formed in the inside in the axial direction, communicates with the pressure fluid source of the hydraulic control device 23, and is opened by the opening 71 at the output shaft end 31 inserted into the shaft hole 60a of the sleeve yoke 6.
And a trough-like projection 46 extending continuously toward the inside of the extension housing 4 and connected to the bearing 5 of the extension housing 4 and the lowermost portion of the bearing 26.
An output shaft bearing lubricating device comprising an oil sump 77 composed of a dam plate 75 for maintaining a fluid level above 26a.

Further, in the present invention, the oil sump 77 is projected from the bearing portion 5 of the extension housing 4 toward the transmission case 22 in parallel with the output shaft 3 of the transmission mechanism. 5, a trough-shaped projection 46 having a cylindrical surface inner surface 49 which is an extension of the inner peripheral surface of 5, and a rim 76b fixed to the cylindrical-surface inner surface 49 of the tip 47 of the trough-shaped projection 46, etc. And a weir plate 75 having an outer peripheral portion.

Further, in the present invention, when the barrier plate 75 is formed in an annular shape, the barrier plate 75 has an inner surface of the cylindrical surface of the tip end portion 47 of the gutter-shaped protruding portion 46 due to the outer peripheral portion of the rim 76b or the like. The inner peripheral portion 76c is fixed to the output shaft 3 of the transmission mechanism so as to be spaced apart from the output shaft 3 of the transmission mechanism. Is a locking portion 55 protruding from the inner wall surface of the extension housing 4.
Supported by.

The reference numerals added to the above-mentioned configuration of the present invention refer to the reference numerals attached to the drawings for understanding of the present invention, and do not limit the configuration of the present invention as illustrated.

[Action]

According to the present invention, the fluid of the pressure fluid source of the hydraulic control device that performs the shift control of the speed change mechanism of the automatic transmission is formed in the output shaft of the speed change mechanism and flows through the oil passage that opens at the output shaft end. Through the shaft hole of the sleeve yoke through the shaft hole, and the spline formed on the inner peripheral surface of the sleeve portion of the sleeve yoke meshes with the spline formed on the outer peripheral surface of the output shaft of the transmission that engages with the spline. Bearing to the sleeve portion of the sleeve yoke of the bearing disposed between the bearing portion and the sleeve yoke, by lubricating the portion and flowing into an oil sump formed by being connected to the lower portion of the bearing portion in the extension housing. Lubricate the surface.

〔Example〕

In an embodiment of the present invention shown in the drawings, an automatic transmission 2 for a vehicle includes a torque converter that is a starting device, a pump (both not shown) that is a pressure fluid source, and four forward and one reverse stages including an overdrive. A speed change mechanism (not shown) including a planetary gear mechanism that achieves a speed change step by selective engagement of a clutch and a brake, and the speed change mechanism is housed in an internal space 21 in a converter case (not shown) of the torque converter. A transmission case 22 to be connected, an output shaft 3 connected at one end to the output member of the transmission mechanism, and rotatably supported by the transmission case 22 near the one end;
An extension housing 4 connected to the transmission case 22 and having a bearing portion 5 formed at a free end is provided, and a spline 63 that engages with a spline 33 formed on an outer peripheral portion of the rear portion 31 of the output shaft 3 is provided with a shaft hole. A sleeve yoke 6 formed on 60a is rotatably supported by the bearing 26 on the outer peripheral side 64 thereof on the bearing portion 5. In the figure, reference numeral 20 is the intermediate shaft of the planetary gear mechanism that constitutes the speed change mechanism, and reference numeral 24 is the pressure from the discharge side of the pump, which is the pressure fluid source, in the oil pan 25 fixed to the bottom of the transmission case 22 at the periphery. Reference numeral 27 is a vehicle speed sensor, which is a valve body provided with a hydraulic control device 23 including various valves and oil passages for introducing a fluid to generate a control hydraulic signal in a speed change mechanism.

In the above embodiment, the sleeve yoke 6 supported by the bearing portion 5 of the extension housing 4 is rotatably supported by the bearing 26 on the outer peripheral side 64 via the bearing 26, and the spline 63 is formed on the inner peripheral side 61a. Cylindrical sleeve part 6
1 and a hub portion 62 connected to the propeller shaft 70 via a universal joint 69. The hub 62 has its root
It is connected to the sleeve portion 61 by 65, and also the inner peripheral side 62a thereof
Is connected to the universal joint 69 via a bearing 67 and a seal 68.

In the extension housing 4, the bearing portion 5 is connected to the bearing portion 5 at a low level position, and in the normal posture of the extension housing 4 when the vehicle is stationary on a flat horizontal surface, the bearing portion 5 is vertical. Lower position,
An oil sump 77 is formed in the. In the illustrated embodiment, a gutter-shaped protrusion 46 is provided continuously with the bearing portion 5 in the direction toward the transmission case 22 and extends along the lower half of the cylindrical surface of the bearing portion 5 which supports the bearing 26. And the inner surface 49 of the gutter-shaped protrusion 46 is formed as a cylindrical surface extending in the same plane as the cylindrical surface of the bearing 5. At the tip 47 of the trough-shaped projection 46 on the transmission case 22 side, the inner surface is
Locking part formed on a cylindrical surface with a radius larger than the cylindrical surface of 49
The inner surface 49 is continuously connected to the inner surface 49 through a step 76a, and the engaging portion 48 is formed in a ring shape by a plate-like member and has a rim at the peripheral edge.
A barrier plate 75 formed by bending the 76b is arranged such that its annular portion is concentric with the output shaft 3 in a plane perpendicular to the output shaft 3 and is locked by the rim 76b which is the outer peripheral portion thereof. It is fixed to the portion 48, and the upper portion thereof is supported by a locking portion 55 protruding from the inner wall 1 of the extension housing 4, and the inner peripheral portion 76c thereof is located at a distance from the output shaft 3. , Is arranged concentrically with the output shaft 3.

An oil passage 72 is formed in the axial direction of the output shaft 3 of the speed change mechanism in the axial direction, and the opening of the oil passage 72 on the speed change mechanism side is a pump of a pressure fluid source of the hydraulic control device 23 of the automatic transmission. A plug body 73 having an orifice is fitted into an end opening 71 on the output shaft rear portion 31 side which is communicated with the discharge side and is inserted into the shaft hole 60a of the sleeve yoke 6. Sleeve yoke 6
The amount of fluid supplied to the shaft hole 60a is adjusted by the orifice effect of the orifice. The shaft hole 60a of the sleeve yoke 6 is liquid-tightly closed by a plug 74 fitted at an end on the hub 62 side. Therefore, from the oil passage 72 to the shaft hole of the sleeve yoke 6.
The fluid supplied to 60a flows through the meshing portion 30A between the spline 63 of the sleeve yoke 6 and the spline 33 of the output shaft 3 to lubricate it, and the oil formed by the gutter-like protrusion 46 and the dam plate 75 is formed. The fluid that flows into the reservoir 77 and is blocked by the barrier plate 75 and overflows the barrier plate 75 is at the lowest level position in the extension housing 4, that is, the normal state of the extension housing 4 when the vehicle stands on a flat horizontal surface. In the posture, it flows into the lowermost portion in the extension housing 4 in the vertical direction, and is returned to the oil pan 25 through the oil passage formed in the end wall of the transmission case 22 at that position. Here, the radial width of the annular portion of the barrier plate 75 is spaced from the outer peripheral surface of the output shaft 3, and the bearing of the bearing 26 that slides with the sleeve portion 61 of the sleeve yoke 6 is provided. The lowermost position 26a of the surface, the lowest level position in the vertical direction of the bearing surface of the bearing 26 in the normal posture of the extension housing 4 when the vehicle is resting on a flat horizontal surface, and the level of the fluid in the oil sump 77 Keep width. As a result, at least one side surface of the bearing at the lowermost portion 26a is immersed in the fluid held in the oil sump 77, and the bearing surface is lubricated.

On the outer peripheral portion of the bearing portion 5 of the extension housing 4, a cylindrical protruding portion 41 that is concentrically protruded from the output shaft 3 on the side opposite to the transmission case 22 is integrally formed.
An oil seal 43 is fixed to the inner peripheral side 42 and is in sliding contact with the outer peripheral side 64 of the sleeve portion 61 of the sleeve yoke 6, and a first dust cover 45 is attached to the outer peripheral side 44. A second dust cover 66 is fixed at one end 66a to the outer peripheral side 65a of the root portion 65 of the sleeve yoke 6, and the other end 66b of the dust cover 66 is arranged to the inner peripheral side of the first dust cover 45. Arranged in parallel. These first and second dust covers 45,6
The 6 and the oil seal 43 prevent foreign matter in the outside air from entering the bearing portion of the extension housing 4 with respect to the sleeve yoke 6 of the bearing 26. In the figure, reference numeral 5A denotes an oil passage formed in a groove shape in the extension housing 4 in parallel with the output shaft 3 in a portion of the bearing portion 5 where the gutter-like protrusion 46 is not formed. It is for supplying floating fluid particles to the space between the oil seal 43 and the bearing 26.

According to this embodiment, the fluid supplied from the pressure fluid source of the hydraulic control device 23 of the automatic transmission to the oil passage 72 of the output shaft 3 is the plug 73.
The flow rate is adjusted by an orifice that opens in the nozzle, and is ejected from the orifice by the fluid pressure and centrifugal force as shown by arrow 7, and the meshing portion 30A of the splines 33 and 63 is forcibly lubricated and retained in the oil sump 77. The fluid retained in the reservoir 77 lubricates the bearing surface of the bearing 26. In addition, the mating portion 30A of the splines 33, 63
The fluid flowing along the spline 33 of the output shaft 3 is made into particles by the centrifugal force due to the rotation of the output shaft 3 and is made to float in the extension housing 4, and from the oil passage 5A of the bearing portion 5 to the oil seal 43. Supplied, the oil seal
Lubricate the sliding surface of 43 with the sleeve yoke 6.

〔The invention's effect〕

According to the present invention, a sleeve yoke axially spline-coupled to an output shaft of a transmission mechanism of an automatic transmission housed inside a transmission case is connected to the outer peripheral surface of the sleeve portion and the transmission case. The extension housing is provided with a yoke portion that is rotatably supported by a bearing that is arranged between the bearing and the inner peripheral surface of the bearing portion that is formed at the free end of the extension housing and that forms a universal joint with the propeller shaft. An oil passage formed in the output shaft of the speed change mechanism in the axial direction is communicated with a pressure fluid source of a hydraulic control device of the automatic transmission, and is closed by a closing means on the hub side from the end of the output shaft. Since it is opened in the shaft hole of the sleeve yoke that is liquid-tightly closed, the fluid supplied from the pressure fluid source of the hydraulic control device is supplied from the oil passage in the output shaft. It is supplied to the shaft hole of the closed sleeve yoke, and the meshing portion of the spline formed on the inner peripheral surface of the shaft hole of the sleeve yoke and the spline formed on the outer periphery of the output shaft is forcibly lubricated, and the extension is performed. The oil flows into an oil sump provided at a lower position of the bearing portion inside the chassis housing.

The oil sump is a gutter-shaped projection that is connected to the bearing portion of the extension housing and extends toward the inside of the extension housing, and a weir that maintains the fluid level above the lowermost portion of the bearing. Since it is made of a plate, the level of the fluid retained in the oil sump reaches the bearing surface of the bearing with respect to the sleeve yoke, and lubricates the bearing surface.

Therefore, while the vehicle is continuously used, the fluid of the pressure fluid source, which is used for the operation and lubrication of the automatic transmission as the vehicle travels, always flows through the oil passage formed on the output shaft of the transmission mechanism. Through the spline formed on the output shaft and the spline formed on the sleeve yoke and the bearing surface of the bearing that rotatably supports the sleeve yoke, and lubricates them. Even if no special treatment is applied when the transmission is installed, lubrication is performed for many years, and the oil level keeps the fluid level above the bottom of the bearing by the weir plate, which causes the vehicle to stop operating. Even when the vehicle is running, the lubrication fluid is in contact with the bearing surface of the bearing that supports the sleeve yoke of the extension housing of the automatic transmission. The upper fluid overflows from the oil reservoir to hold the required amount of fluid, so that the bearing surface of the bearing is always supplied with a stable amount of fluid, and if the vehicle engine is started, it will enter the spline meshing part. Immediately supplies the fluid for lubrication and replaces the fluid remaining in the oil sump, so that the sliding resistance of the engagement portion of the spline and the bearing surface of the bearing is kept low for many years,
It has a great effect of increasing durability.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention, and FIG. 2 is a sectional view of a bearing portion of an extension housing. In the figure, the following symbols indicate the following parts, respectively. 2 ... Automatic transmission, 3 ... Output shaft, 30A ... Meshing part, 33 ... Spline, 4 ... Extension housing, 22 ... Transmission case, 23 ... Hydraulic control device, 24 ... Valve body , 26 ... Bearing, 5 ... Bearing part, 46 ... Trough-shaped projection part, 47 ... Its tip part, 48 ... Its locking part, 49 ... Its inner surface, 6 ... Sleeve yoke, 60a ... … The shaft hole, 61 …… the sleeve part, 62 …… the hub part, 70 …… the universal joint, 72 …… the oil passage, 75 …… the dam plate, 77 …… the oil sump.

Claims (3)

[Claims] 1. A transmission case for accommodating a speed change mechanism of an automatic transmission having a hydraulic control device therein, and a transmission case continuously provided to the transmission case, wherein a bearing is provided at a free end on an inner peripheral surface. An extension housing having a bearing portion to be supported and a spline having an axial hole formed on the inner peripheral surface of the axial hole are slidable in the axial direction on a spline formed on the outer peripheral portion of the output shaft of the transmission mechanism. A sleeve yoke that is engaged with the propeller shaft, and a hub portion that forms a universal joint between the propeller shaft and the sleeve yoke supported by the bearing portion of the extension housing by the bearing in the sleeve portion; Means for liquid-tightly closing the shaft hole of the sleeve yoke engaging with the output shaft on the hub portion side from the end portion of the output shaft; An oil passage that is formed in the axial direction in the axial direction, communicates with the pressure fluid source of the hydraulic control device, and opens at the end of the output shaft that is inserted into the shaft hole of the sleeve yoke; and the bearing portion of the extension housing. And a sump including a trough-shaped projection extending continuously toward the inside of the extension housing and a weir plate for maintaining a fluid level above the lowermost portion of the bearing. An output shaft bearing lubrication device for an automatic transmission for a vehicle. 2. The oil sump is projected from the bearing portion of the extension housing toward the transmission case in parallel with the output shaft of the speed change mechanism, and extends the inner peripheral surface of the bearing portion. Between the gutter-shaped protruding portion having a cylindrical surface, the outer peripheral portion fixed to the cylindrical surface of the tip end portion of the gutter-shaped protruding portion in the extension housing, and the output shaft of the transmission mechanism. An output shaft bearing lubricating device for an automatic transmission for a vehicle according to claim 1, characterized in that it comprises a weir plate having an inner peripheral portion located apart from each other. 3. The dam plate is formed in an annular shape, is disposed coaxially with the output shaft of the speed change mechanism, and has a part of its outer peripheral portion projecting from an inner wall surface of the extension housing. The output shaft bearing lubrication device for an automatic transmission for a vehicle according to claim 2, wherein the output shaft bearing lubrication device is supported by a stop portion.