JPH05118411A - Power transmission device - Google Patents

Abstract

PURPOSE:To prevent oil leakage, arrange an air breezer near an oil guarder, and save the installation space by installing a cover on the oil guarder for catching the oil splashed up by the revolution of the power transmission mechanism. CONSTITUTION:A transfer 19 being a power transmission device, a planetary gear type center differential gear 5 as power transmission mechanism is arranged inside a rotary case 35 accommodated inside a transfer case 33 as the casing for the transfer 19. An oil guarder 105 is arranged along the inner periphery of the transfer case 33, and the oil splashed up by a transfer gear 37 is caught and dripped into a lubricating part. In this case, a cover 141 is installed at the bendable part corresponding to the inner peripheral shape of the transfer case 33 of the oil guarder 105, and the oil leak from the bendable part is prevented. Then, in the vicinity of the bendable part, an air breezer 147 for lightening the pressure difference between the inside and outside of the casing is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device used in a vehicle or the like.

[0002]

2. Description of the Related Art A "four-wheel drive transfer structure" is disclosed in Japanese Unexamined Utility Model Publication No. Hei 1-71265. This is a transfer housed in a casing having a closed structure.

[0003]

Generally, the casing of a power transmission device such as a transfer or a transmission has a closed structure. Lubricating oil is enclosed in this casing, and this oil is repelled by the rotation of the power transmission mechanism, collected in an oil garter, and flows down to each lubricating point. Also, since an air breather is attached to the casing to prevent changes in the internal pressure, the splashed oil may spout out from the air breather.In the above-mentioned conventional example to prevent this, the splashed oil splashes on the air breather. A baffle plate is provided to shut off the power.

The oil garter is arranged in a narrow portion between the inner circumference of the casing and the power transmission mechanism, and generally has a bent portion along the inner circumference of the casing. Since the oil flow easily hits the bent portion and overflows, it is necessary to dispose the oil garter and the air breather separately.
Therefore, the casing must be provided with its respective placement space. Further, since it is not possible to arrange the air breather behind the oil garter so that the splashed oil does not splash on the air breather, a bubbling blade is required, and the number of parts increases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power transmission device in which an oil garter and an air breather can be arranged close to each other to save the arrangement space and eliminate the need for a baffle plate.

[0006]

A power transmission device according to the present invention includes a casing having a hermetically sealed structure in which oil is enclosed, a power transmission mechanism housed in the casing, and a power transmission mechanism disposed inside the casing for rotating the power transmission mechanism. An oil garter that collects the splashed oil and flows it down to each lubrication point, and a cover attached to the bent part of this oil garter,
An air breather is provided near the mounting portion of the cover and at a position where the splashing oil is blocked by the oil garter, and an air breather for relaxing the pressure difference between the inside and the outside of the casing.

[0007]

[Function] Since the cover is attached to the bent portion of the oil garter to prevent oil leakage, it is possible to dispose the air breather near the attachment portion of the cover, and it is not necessary to separately provide an air breather chamber, and the space is saved. Saved.
Further, at this time, if these are arranged so that the air breather is behind the oil garter with respect to the splashed oil, a baffle plate for shutting off the splashed oil is unnecessary, and the number of parts is reduced.

Also, the strength of the oil garter is increased by mounting the cover on the bent portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment will be described with reference to FIGS.

As shown in FIG. 1, this embodiment is a transfer for a four-wheel drive vehicle, and FIG. 11 shows a vehicle power system using this transfer. Hereinafter, the left-right direction in FIG. 1 is the left-right direction of the vehicle, and the upper side of FIG. 1 corresponds to the front side of the vehicle (upper side of FIG. 11).

First, the structure of this power system will be described with reference to FIG.

This power system includes an engine 1, a transmission 3, a center differential 5 (a differential device arranged between the front and rear wheels), a front differential 7 (a differential device on the front wheel side), front axles 9, 11 and left and right front wheels 13. ，
15, a direction changing gear set 17, a transfer 19 composed of the center differential 5 and the direction changing gear set 17, a propeller shaft 21, a rear differential 23 (a rear wheel differential device), rear axles 25, 27, left and right rear wheels. It is composed of 29, 31 and the like.

Next, the transfer 19 will be described.

As shown in FIG. 1, the transfer case 3
A rotating case 35 and a transfer gear 37 fixed to the left end of the rotating case 35 are bearings 39, in the casing 3 (casing).
40, which is supported by 41, is a shim.

Inside the rotating case 35, a planetary gear type center differential 5 (power transmission mechanism) is arranged. The center differential 5 includes an internal gear 43, an outer pinion gear 45, an inner pinion gear, and a sun gear 47, which are in mesh with each other. Outer pinion gear 4
5 is supported by a pinion shaft 49 via bearings 51, 51, and the pinion shaft 49 is supported at both ends by left and right pinion carriers 53, 55. Similarly, the inner pinion gears are also pinion carriers 53, 55.
It is supported by a pinion shaft whose both ends are supported by bearings. The pinion carriers 53 and 55 are welded to each other via the protrusion 57 on the pinion carrier 55 side.

As shown in FIG. 11, the output gear 59 of the transmission 3 meshes with the input gear 63 on the hollow shaft 61 side. As shown in FIG. 1, the right end of the hollow shaft 61 is spline-connected to the cylindrical member 65, and the internal gear 43 is formed on the cylindrical member 65. The left pinion carrier 53 is integrally formed with a hollow output shaft 67 penetrating the hollow shaft 61, and is connected to the differential case 69 side of the front differential 7 through the output shaft 67 as shown in FIG. 11. .. The sun gear 47 is formed on a hub 71 arranged coaxially with the output shaft 67, and the hub 71 is spline-connected to the right end portion of the rotating case 35. The right front axle 11 penetrates the output shaft 67 and the hub 71 relatively rotatably, and a bearing 73 is provided on the right end side of the transfer case 33.
It is supported by.

The transfer gear 37 meshes with a gear 77 which is integral with the counter shaft 75, and a first bevel gear 79 is fixed to the counter shaft 75, and this bevel gear 79 meshes with a second bevel gear 81. ing. The second bevel gear 81 is integrally formed at the front end of an output shaft 83 arranged in the front-rear direction of the vehicle, and the output shaft 83 is provided with a flange member 85.
Is connected to the propeller shaft 21 side via. The direction changing gear set 17 is formed by the first and second bevel gears 79 and 81.
(Power transmission mechanism) is configured.

The counter shaft 75 is a bearing 8
7, 87, the output shaft 83 is supported on the transfer case 33 by bearings 89, 91, respectively.

In this way, the driving force of the engine 1 is input to the internal gear 43 via the transmission 3 and from the pinion gear to the front differential 7 via the left pinion carrier 53 and from the sun gear 47 to the rotating case 35.
Is output separately to the rear differential 23 side via the front differential 7 and the rear differential 23 respectively.
5 and the left and right rear wheels 29, 31. Further, when a driving resistance difference occurs between the front and rear wheels, the driving force of the engine 1 is differentially distributed to the front and rear sides by the rotation and revolution of the pinion gear.

The transfer case 33 has a hermetically sealed structure, in which lubricating oil is filled up to an oil level 93 shown in FIG. 2 to form a lower oil sump. A seal 95 is arranged between the transfer case 33 and the flange member 85, and a seal 97 is arranged between the transfer case 33 and the right front axle 11. In addition, the transfer case 33
A seal 99 is arranged between the cylindrical member 65 and the cylindrical member 65, and a seal 101 is arranged between the cylindrical member 65 and the output shaft 67. Further, an X ring 103 (a seal having an X-shaped cross section) is arranged between the front axle 11 and the output shaft 67. Thus, oil leakage from the transfer case 33 is prevented, and the transfer case 33 is kept in a hermetically sealed state.

The bevel gear 7 is driven by the oil in the lower oil sump.
The meshing parts of 9, 81 and bearings 87, 89, 91 are lubricated. This oil is also used in the gear 77 and the bevel gear 7.
It is splashed on the bearing 39 by the rotation of 9, and is also splashed on the upper part of the transfer case 33 by the rotation of the transfer gear 37.

As shown in FIG. 1, the transfer case 3
An oil garter 105 is arranged along the inner circumference of the No. 3. The oil garter 105 is made of nylon and has four bent portions 107 formed by bending at right angles according to the inner peripheral shape of the transfer case 33. Figure 3
As shown in FIG. 6, the oil garter 105 has a groove 109 having a U-shaped cross section and has flexible claws 111, 113, 1
It is attached to the transfer case 33 by 15, 117 so as to be lowered toward the right.

As shown in FIGS. 5 and 6, an opening 119 and a convex oil guide 121 are provided on the rotation case 35 side of the oil garter 105. The oil splashed by the transfer gear 37 is the oil guide 121.
The oil garter 105 collects through the opening 119, flows down to the right, and flows down through the downflow hole 123 provided at the right end.

The bearing 41 is a one-sided sealed bearing whose left side is sealed. The shim 40 is formed to have a small inner diameter, and an upper oil sump 125 is formed in the transfer case 33 together with the seal 97. The oil from the downflow hole 123 is collected in the upper oil sump 125, passes through the oil passage 127 from between the front axle 11 and the hub 71, enters the rotating case 35, and lubricates the respective parts of the center differential 5.
The output shaft 67 and the cylindrical member 6 are passed through 9, 130, 131.
5 and the bushes 133 and 135 arranged between the cylindrical member 65 and the rotating case 35 are lubricated, and then the rotating case 3
5 flows out through the openings 137, 138, 139 provided in No. 5, and returns to the lower oil sump.

The oil flowing down the groove 109 of the oil garter 105 may flow out at a bent portion 107 due to a reduced flow velocity. Therefore, as shown in FIG. 7, a cover 141 is attached to the bent portion 107 to prevent this oil leakage.
As shown in FIGS. 9 and 10, the cover 141 is provided with a clamp portion 143 that sandwiches one edge of the oil gutter 105 and a pressing portion 145 that is pressed against the other edge of the oil gutter 105. Is attached to. By preventing oil leakage in the middle of the oil garter 105, the amount of oil supplied from the downflow hole 123 to the oil sump 125 does not decrease, and therefore the rotating case 3
5 Lubrication of the inside is sufficiently performed.

As shown in FIGS. 1 and 2, the air breather 1 is provided at a position close to the bent portion 107 of the oil garter 105.
47 is attached through the transfer case 33. The air breather 147 has a double valve structure that opens when the pressure difference between the inside and outside of the transfer case 33 exceeds a set value. The positive pressure of the transfer case 33 due to the temperature rise when the transfer 19 operates and the negative pressure difference between the inside and the outside such as the negative pressure when the transfer case 33 is cooled by the outside air are alleviated, and the respective seals 95, 97, 99, 101, and the X-ring. 10
Protect 3.

By installing the cover 141 to prevent oil leakage from the bent portion 107, the air breather 14
Even if 7 is arranged near the bent portion 107 of the oil garter 105, the oil does not spout from the air breather 147 to the outside. In this way, the oil garter 105 and the air breather 147 can be located near each other, and the disadvantage of the conventional arrangement space due to the separation of these is eliminated.

Further, as shown in FIGS. 1 and 2, the air breather 147 is arranged behind the oil garter 105 so that the oil splashed by the transfer gear 37 is not splashed, and the splashed oil is discharged from the air breather 147. It never spurts.

As described above, since the oil garter 105 also serves as the baffle plate, the baffle plate is unnecessary, the number of parts is reduced, and the space for arranging the baffle plate can be saved.

The transfer 19 is thus constructed.

In the vehicle shown in FIG. 11, since the center differential 5 is sufficiently lubricated, the durability against high-speed driving for a long time or high torque driving is high.

The power transmission device of the present invention may be a transmission.

[0033]

According to the power transmission device of the present invention, a cover is attached to the bent portion of the oil garter that collects the oil repelled by the rotation of the power transmission mechanism and transfers it to the lubrication point to prevent the oil from overflowing. As a result, the air breather and the oil garter can be arranged close to each other, and the air breather chamber is not required, and the arrangement space is saved. In addition, the air breather is placed close to the shadow of the oil garter to block the splashed oil from the air breather, preventing the oil from spouting and eliminating the need for a baffle plate.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of one embodiment and corresponds to the AA cross-sectional view of FIG.

FIG. 2 is a side view of this embodiment, in which a main portion is cut away.

FIG. 3 is a bottom view of an oil garter and a cover used in this embodiment.

FIG. 4 is a side view of one side of the oil garter and the cover.

FIG. 5 is a side view of the other side of the oil garter and the cover.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a perspective view showing a state in which a cover is attached to the oil garter.

FIG. 8 is a bottom view of the cover.

9 is a sectional view taken along line CC of FIG.

10 is a cross-sectional view taken along line DD of FIG.

11 is a skeleton mechanism diagram showing a power system of a vehicle using the embodiment of FIG.

[Explanation of symbols]

 5 Center Differential (Power Transmission Mechanism) 17 Direction Conversion Gear Set (Power Transmission Mechanism) 33 Transfer Case (Casing) 105 Oil Garter 107 Bent Section 141 Cover 147 Air Breather

Claims (1)

[Claims] 1. A casing having an airtight structure in which oil is enclosed, a power transmission mechanism housed in the casing, and oil which is disposed inside the casing and splashed up by rotation of the power transmission mechanism is collected and flows down to each lubrication point. An oil garter to be used, a cover attached to the bent part of this oil garter, and an air breather which is located near the mounting part of this cover and at a position where the oil repelling oil is blocked by the oil garter to alleviate the pressure difference inside and outside the casing. A power transmission device comprising: