JPH0730831B2 - Lubrication device for extension housing bearing of automatic transmission - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an extension housing bearing of an automatic transmission mounted on a vehicle.

(Prior Art) Conventionally, the extension housing of the automatic transmission is
A bearing portion is formed to support the output shaft, but since the bearing portion is located at the rear end portion of the automatic transmission, the supply of lubricating oil to the bearing portion is restricted. Therefore, an oil passage is formed in the output shaft, the lubricating oil in the oil passage is diffused and supplied to the inner wall of the extension housing by the centrifugal force caused by the rotation of the output shaft, and the ribs and the gutters ( The lubricant oil is transmitted to the bearings and the like.

(Problems to be Solved by the Invention) However, in the conventional lubrication device for the extension housing bearing of the automatic transmission, an oil passage is formed in the output shaft, and the centrifugal force generated by the rotation of the output shaft causes Since the lubricating oil is diffused and supplied to the inner wall of the extension housing, the lubricating oil does not reach the inner wall of the extension housing when the vehicle is running at low speed, which makes it difficult to supply the lubricating oil.

Further, since the lubricating oil supplied to the inner wall of the extension housing is further transmitted to the ribs and gutters and supplied to the bearing portion, the lubricating oil is not supplied when the vehicle leans forward on a downhill or the like. It will be difficult.

Therefore, it is conceivable to supply the oil of the hydraulic control device of the automatic transmission as lubricating oil directly to the bearing portion of the extension housing.In that case, the oil supply from the hydraulic control device to the transmission device built into the transmission case is required. May lose balance.

In addition, an oil receiver is arranged in the extension housing, and an axial hole and a radial hole communicating with the axial hole are formed in the output shaft, so that the lubricating oil can be radially directed by the centrifugal force caused by the rotation of the output shaft. It is conceivable to eject the lubricant to the bearing portion of the extension housing directly via the oil receiver.

However, it is difficult to form a long axial hole that extends to the extension housing on the output shaft due to the restrictions on machining with a drill. Even if an axial hole could be formed, it would be difficult to form an axial hole. In order to supply the lubricating oil in the hole to the bearing portion, it is necessary to change the positions of the radial hole, the oil receiver, etc. variously, which not only increases the manufacturing cost, but also the transmission device incorporated in the transmission case. The balance of oil supply to the tank may be disrupted.

The present invention solves the problems of the conventional extension housing bearing lubrication device for an automatic transmission, and stabilizes the oil of the hydraulic control device without being affected by the vehicle speed or the vehicle attitude. Can be supplied to the bearing part of the extension housing, and it is not necessary to dispose a member such as an oil receiver in the extension housing, and to maintain the balance of the oil supply from the hydraulic control device to the necessary parts on the transmission case side. It is an object of the present invention to provide a lubrication device for an extension housing bearing of an automatic transmission, which can improve the reliability of the bearing portion of the extension housing.

(Means for Solving the Problems) Therefore, in the lubrication device for the extension housing bearing of the automatic transmission according to the present invention, the transmission case and the extension connected to the transmission case with their end surfaces abutting against each other are connected. A housing, a valve body provided with a hydraulic control device that is fastened to the transmission case, and supplies oil from a hydraulic source to a transmission device incorporated in the transmission case to control a shift, and extends into the extension housing. And an output shaft of the transmission.

In addition, a sleeve yoke that is spline-fitted to the output shaft and is inserted into and supported by a bearing portion of the extension housing, and a hydraulic control device for the valve body that is arranged in the transmission case. First oil passage for supplying the required oil on the transmission side to the first oil passage, and one end communicates with the first oil passage and the other end opens in the extension housing so as to face the bearing portion. A second oil passage to
An orifice that is disposed in the second oil passage and that limits the lubricating oil supplied from the first oil passage to the bearing portion.

(Operation and Effect of the Invention) According to the present invention, as described above, in the lubrication device for the extension housing bearing of the automatic transmission, the transmission case and the transmission case are connected to each other with their end surfaces in contact with each other. An extension housing, a valve body provided with a hydraulic control device that is fastened to the transmission case and supplies oil from a hydraulic source to a transmission device built in the transmission case to control a shift, and extends into the extension housing. And an output shaft of the transmission.

A sleeve yoke that is spline-fitted to the output shaft and is inserted into and supported by a bearing portion of the extension housing, and a sleeve yoke that is disposed in the transmission case and that receives oil from a hydraulic control device of the valve body is transmitted. First for supplying necessary parts on the side
Of the oil passage, and one end of the oil passage communicates with the first oil passage,
A second oil passage, the other end of which is opened to face the bearing portion in the extension housing, and the second oil passage is arranged in the second oil passage and is supplied from the first oil passage to the bearing portion. An orifice that limits the lubricating oil.

Therefore, the oil from the valve body hydraulic control device
Since it is directly supplied as lubricating oil to the bearing portion via the first oil passage and the second oil passage, not only can the entire bearing portion be lubricated, but the vehicle is traveling at a low speed. In some cases, even if the vehicle leans forward, the bearing can be lubricated constantly and stably.

Further, in this case, since the orifice that restricts the lubricating oil supplied from the first oil passage to the bearing portion is provided in the second oil passage, the hydraulic control device is provided on the transmission case side. The balance of the oil supply to the necessary parts can be maintained, and the reliability of the bearing part of the extension housing can be improved.

Moreover, since it is not necessary to form a long axial hole extending to the extension housing in the output shaft, and it is not necessary to dispose a member such as an oil receiver in the extension housing, the manufacturing cost can be reduced. Further, it is possible to prevent the balance of the oil supply to the transmission incorporated in the transmission case from being lost.

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

In the present embodiment, the lubrication device 1 for an automatic transmission extension housing bearing of the present invention has an overdrive (OD).
It is applied to an automatic transmission 2 for a vehicle having four forward gears and one reverse gear.

The vehicle automatic transmission 2 includes a torque converter, an overdrive (OD) device, a torque converter housing (not shown) having an input shaft of the automatic transmission, an intermediate shaft 20 connected to the input shaft, and a planetary gear mechanism. , A transmission case 22 incorporating a transmission 21 having three forward gears and one reverse gear equipped with a clutch and a brake, and a valve that is fastened to the lower surface of the transmission case 22 and has these various functions, and stores an oil passage according to a shift signal. A shift valve for switching the transmission, a throttle valve that outputs a shift signal, an oil pump that is a source of hydraulic pressure, a hydraulic control device 24 having a valve body 23, an oil pan 25 that incorporates the hydraulic control device 24, and a rear end of the transmission case 22. An output shaft 3 connected to the intermediate shaft 20 and fastened by a bolt (not shown) to the intermediate shaft 20; ON / OFF by the power switch
An electronic vehicle speed sensor 27a, an extension housing (hereinafter referred to as a housing) 4 that is attached to the output shaft 3 and has a governor valve 27b that produces a governor pressure corresponding to the rotation speed of the output shaft 3, that is, the vehicle speed, and the output shaft. 3 and a sleeve yoke 26 supported by the bearing portion 5 of the housing 4 via a bearing (radial bearing) 27, and an extension housing for supplying a stable amount of lubricating oil to the bearing portion 5 of the housing 4. The bearing unit forced lubrication means 6 is provided.

In the bearing portion 5 of the housing 4, an oil reservoir weir 53 is fixed to the tip inner peripheral side 52 of a gutter-shaped protruding portion 51 that protrudes toward the transmission case 22 (leftward in the drawing) in the lower bearing portion 5 in the drawing, and the sleeve 5 An oil sump 54 surrounded by the yoke 26, the radial bearing 27, and the oil sump weir 53 is provided, and foreign matter enters the output shaft 3 from the outside on the inner peripheral side 56 of the protruding portion 55 protruding rightward in the drawing. Further, an oil seal 57 for preventing leakage of lubricating oil is attached, and a dust cover 59 for preventing foreign matter from entering the oil seal 57 from the outside is attached on the outer peripheral side 58. An oil passage hole 59A is formed in the bearing portion 5 on the upper side in the drawing, and an oil hole 27A is formed in the radial bearing 27.

Forced lubrication means 6 for the extension housing bearing portion
Is provided in the transmission case 22, and the line pressure from the valve body 23 is transmitted through the oil chamber 61 to the transmission 21.
Of a line pressure oil passage (first oil passage) 62 for supplying to a hydraulic servo (not shown) and a second oil passage, and the second oil passage includes a bearing lubricating oil extracting oil passage 63 and a bearing lubricating oil. It consists of a cylinder tube 67 that is an oil passage. Further, the bearing lubricating oil take-out oil passage 63 is formed by the valve body 23 and the oil chamber 61 of the line pressure oil passage 62.
Transmission case 22 to branch from between
Is formed by drilling or casting on the wall portion 22a of
An orifice 64 for controlling the flow rate by a throttling action is mounted inside, and the cylinder tube 67 that is the bearing lubricating oil passage is connected via a connecting portion 66 that has a packing 65 that is a seal member that prevents leakage of lubricating oil. The bearing lubrication yuzu oil passage 63 is connected at one end 67a to the oil passage hole 59A of the bearing portion 5 of the housing 4 and the other end 67B connected to the oil hole 27A of the radian bearing 27, the electronic vehicle speed sensor 27a. , Governor valve 2
7b, the output shaft 3 and the oil sump weir 53 are arranged so as to be curved.

With this configuration, the hydraulic oil (lubricating oil) in the line pressure oil passage 62
Enters the cylinder tube 67 through the bearing lubricating oil extraction oil passage 63 while the amount of oil is controlled by the orifice 64. Further, lubricating oil is supplied from the other end 67B of the cylinder tube 67 to the jet bearing portion 5, lubricates the oil seal 57 and the radial bearing 27 through the oil passage hole 59A, and further lubricates the oil seal 57 and the radial bearing 27. The lubricating oil lubricates the sleeve yoke 26 and the output shaft 3 and is supplied to the oil sump 54. Further, since the cylinder tube 67 is arranged on the outer periphery of the electronic vehicle speed sensor 27a, it is possible to form a hole in the cylinder tube 67 and lubricate a speedometer gear (not shown) through the hole. As a result, the output shaft 3 rotates smoothly, the loss of the engine output that drives the output shaft 3 is suppressed, and the consumption of engine fuel can be reduced.

In this embodiment, the bearing lubricating oil extraction oil passage 63 is formed in the line pressure oil passage 62 by drilling or casting, but the bearing lubricating oil extraction oil passage 63 is formed in the valve body 23 by drilling or casting. May be.

Although the bearing lubricating oil passage is the cylinder tube 67, it may be formed by drilling or casting on the wall of the housing 4.

Further, although the orifice 64 is provided in the bearing lubricating oil extraction oil passage 63, it may be provided in the cylinder tube 67 or the packing 65.

[Brief description of drawings]

1 is a front sectional view showing an embodiment of a lubricating device for an extension housing bearing of an automatic transmission according to the present invention, FIG.
FIG. 1 is a side view of an extension housing of a lubricating device for an extension housing bearing of an automatic transmission according to the present invention. In the figure, 1 ... Lubrication device for extension housing bearing of automatic transmission, 2 ... Automatic transmission for vehicle, 3 ... Output shaft, 4 ... Extension housing, 5 ... Bearing portion, 6 ... Extension housing bearing portion Forced lubrication means, 21 ... transmission, 22 ... transmission case, 23 ... valve body, 24 ... hydraulic control device, 26 ...
Sleeve yoke, 27 …… Radial bearing, 62 …… Line pressure oil passage, 63 …… Bearing lubricating oil extraction passage, 64 …… Flow control throttle (orifice), 65 …… Seal member (packing), 67 …… Bearing Lubrication oil passage (cylinder tube)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takuji Taniguchi 10 Takane, Fujii-cho, Anjo-shi, Aichi Aisin Warner Co., Ltd. (72) Masanori Kubo 1-cho, Toyota-cho, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Yutaka Toga 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (56) Bibliography SHO 55-173745 (JP, U) ACT 57-190960 (JP, U) ACT Kai 57-40762 (JP, U)

Claims (6)

[Claims] 1. A transmission case, an extension housing connected to the transmission case with their end surfaces in contact with each other, and a gearbox which is fastened to the transmission case and has oil from a hydraulic source incorporated in the transmission case. A valve body provided with a hydraulic control device for controlling the speed change by supplying the device, an output shaft of a transmission extending in the extension housing, a spline fitting to the output shaft, and a bearing portion of the extension housing. A sleeve yoke that is inserted and supported, a first oil passage that is disposed in the transmission case and that supplies oil from the hydraulic control device of the valve body to a necessary portion on the transmission side, and one end of the first oil passage While communicating with one oil passage, A second oil passage that opens in the extension housing so as to face the bearing portion, and a lubricating oil that is disposed in the second oil passage and is supplied from the first oil passage to the bearing portion. An extension housing bearing lubrication device for an automatic transmission, comprising: 2. A lubrication device for an extension housing bearing of an automatic transmission according to claim 1, wherein the second oil passage is opened above the bearing portion. 3. The lubrication device for an extension housing bearing of an automatic transmission according to claim 1, wherein the orifice is arranged on one end side of the second oil passage. 4. A gutter-shaped member extending to the lower portion of the output shaft is disposed in the bearing portion, and an oil reservoir weir that forms an oil sump with the bearing portion is disposed in the gutter-shaped member. An extension housing bearing lubrication device for an automatic transmission according to claim 1. 5. The lubrication device for an extension housing bearing of an automatic transmission according to claim 4, wherein the oil reservoir weir comprises an annular plate arranged so as to surround the output shaft. 6. The oil reservoir weir is arranged between the bearing portion and the transmission case.
Lubrication device for an extension housing bearing of an automatic transmission according to paragraph.