JPH0743521Y2 - Lubricant supply mechanism for power transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lubricating oil supply mechanism of a power transmission device.

[Technical background and problems] As an internal lubrication structure for this type of rotating body,
This is described in FIG. 2 of Japanese Patent No. 7120. This structure has a structure in which the lubricating oil is guided to a desired internal lubrication portion by utilizing the pressure at the time of gear engagement.

However, in the case of such a structure, if the lubricating oil is always present in the meshing portion of the gear that is the rotating body, in the case of a shape and structure where constant supply is difficult, for example, in a differential device or the like. It is hard to say that the casing is wrapped around the gear mechanism.

Even if the lubricating oil is supplied to the gear meshing portion, it must be sent to the inside against the centrifugal force caused by the rotation, which is not sufficient.

Therefore, the amount of lubricating oil supplied to the internal lubrication part becomes insufficient, which may cause seizure or the like.

[Object of the Invention] The present invention has been made in view of the above problems, and provides a lubricating oil supply mechanism of a power transmission device capable of supplying sufficient lubricating oil to the inside of a rotating body in a rotating state. To aim.

[Means for Solving the Problems] In order to achieve the object, the present invention has a pinion shaft in a differential case, a pinion gear rotatably supported by the pinion shaft, and a pair of pinion gears that mesh with the pinion gear. A side gear is built in, the one side gear is penetrated and spline-connected to the pinion shaft, and the other side gear is provided with an input shaft so that the rear end is rotatably slidably supported on the sliding part open at the front end. , The differential case is formed integrally with one of the side gears and is provided so as to be connected to the first output shaft by a chain or the like, and the other side gear is extended to the opposite side coaxially with the input shaft to serve as the second output shaft. And the rear end side of the second output shaft is spline-connected to the sleeve yoke of the propeller shaft. Both ends of the differential case are rotatably supported by partition walls in the housing of the vehicle transmission, and the sleeve yoke is rotatably supported by an extension portion of the housing. This latter support allows the slave yoke to vibrate during vehicle running. Is configured to be slidable with respect to the second output shaft and the extension portion, and a space between the rear end surface of the second output shaft and the bottom surface of the spline fitting hole of the sleeve yoke is formed by a spline gap. It is provided as a first oil reservoir communicating with the space in the housing, a through hole communicating with the second output shaft from the rear end surface to the sliding portion is provided, and the sliding portion is provided inside the differential case. A communication passage is provided, and a sealed second oil reservoir is provided at a rear portion of the inner hole of the housing extension portion so as to communicate with a space inside the housing, and the second oil reservoir and the first oil reservoir are communicated with each other. The hole has a configuration formed by providing through the sleeve yoke.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3 applied to a center differential. First,
The configuration will be described.

A ring gear 9 is provided on the outer periphery of a differential case 7 as a rotating body whose both ends are rotatably supported by rolling bearings 3 and 5 provided in two vertical partitions in a housing 1 of a vehicle transmission. There is.

The ring gear 9 is rotatably supported by rolling bearings 13 and 15 at both ends in the housing 1 via a high chain 11 and has a drive shaft (first output shaft) on the output side of the front wheel.
It is connected to an output gear 19 which is integrally provided on the 17.

Gear transmission mechanism 21 in the differential case 7
Is a pinion gear 25 supported by a pinion shaft 23,
27, side gears 29 and 31 meshing with this, drive shaft (input shaft) 33 on the input side provided on the inner peripheral portion of the side gears 29 and 31, and the side gear 31 and the drive shaft 33 are coaxial and opposite to each other. The drive shaft 33 on the rear wheel output side (second output shaft) 35 which is formed to extend to the side and supports the drive shaft 33 at the inner peripheral portion on the side gear 31 side and the sliding portion 39 as an internal lubrication portion, which will be described later. And is configured. A grooved sleeve 93 provided with a dog clutch 87 is slidably spline-coupled to one end of the drive shaft 33 on the input side. The grooved sleeve 93 is provided on a side gear 29 fixed to the differential case 7. It is designed to be detachably engaged with the dog clutch 95. Further, the grooved sleeve 93 includes a grooved sleeve 89 provided on the outer periphery of the differential case 7 and a pin 91.
Are engaged through.

The side gear 29 on the front wheel output side and the differential case 7 are integrally formed by welding or the like.

The drive shaft 33, which is the input shaft, penetrates the side gear 29 and then engages with the pinion shaft 23 and the spline 37, passes through the inner peripheral portion of the side gear 31, and is integrated with the base end side of the drive shaft 35 on the output side. The front end is open to the drive shaft 35 at the engaging front end portion, that is, the rear end (the right end in FIG. 1), and a relatively rotatable sliding portion 39 is formed. Has been done. This sliding part 39 has a third
As shown in the figure, the lubricating oil passage 41 is cut out.

The drive shaft 35 on the rear wheel output side is provided with a lubricating oil supply hole (through hole) 43 for penetrating the gear transmission mechanism 21 and the sliding portion 39 in the axial direction.

The lubricating oil supply hole 43 communicates with a lubricating oil passage 41 formed in the sliding portion 39, and the lubricating oil supply hole 43 communicates with the inside of the differential case 7 via the lubricating oil passage 41. .

Further, it communicates with the inside of the housing 1 through an opening (not shown) provided in the differential case 7.

A propeller shaft 47 is connected to a rear end side (right side in FIG. 1) of the drive shaft 35 on the rear wheel output side via a sleeve yoke 49 and a universal joint 51.

A bush 55 mounted between the sleeve yoke 49 and a bearing portion (housing extension portion) 53 provided integrally with the housing 1, a sleeve yoke 49, and a drive shaft 35.
Propeller shaft 47 with spline 57 that meshes with
Vertical vibration and back and forth movement are allowed.

The structure of the universal joint 51 has a flange 61 that is connected to a flange 59 provided on the sleeve yoke 49 on one side.
The flange yoke is provided with the other side and is connected to the propeller shaft 47 via the journal 65 on the other side.

With the above structure, a sealed space is formed between the rear end surface (right end in FIG. 1) of the drive shaft 35 and the bottom surface of the spline fitting hole of the sleeve yoke 49. It is the first oil sump 69. This first sump 69
Communicates with the space inside the housing 1 through the gap of the spline 57. Further, between the rear end surface of the bush 55 incorporated in the bearing portion 53 integrally provided with the housing 1 and the oil seal 73 provided at the tip of the bearing portion, that is, in the rear portion of the inner hole of the bearing portion 53, there is a hermetic seal. The second oil sump 75 is provided, and the second oil sump 75 and the first oil sump 69 are communicated with each other through a communication hole 71 that penetrates the sleeve yoke 49. Since the lubricating oil is poured into the second oil sump 75, the lubricating oil flow path 45 for guiding the lubricating oil scraped by the rotation of the hibo chain 11 is provided on the upper side in the case 1, and therefore the bush 55 is provided in the bush 55. A large amount of lubricating oil is surely supplied, and a spiral groove 77 is provided on the inner surface of the bush 55 so as to communicate with the inside of the housing 11,
Sufficient lubricating oil is supplied.

The cover 79 protrudes from the vicinity of the rear portion of the sleeve yoke 49 and is loosely inserted into the outer periphery of the bearing portion 53 to prevent foreign matter from entering.

Further, a shift mechanism 81 for removably engaging the side gear 29 and the input side drive shaft 33 is provided, and this shift mechanism 81 has a shift fork 85 fitted to a shift rod 83 and a grooved sleeve 89. Engaged.

The grooved sleeve 89 is formed with a dog clutch 87 on one end side that is spline-engaged with the outer periphery of the drive shaft 33 through a pin 91 penetrating the differential case 7, and is engaged with the grooved sleeve 93 on the inner side to form a side gear 29. The dog clutch 95 provided on the side is detachably engaged by the movement of the shift fork 85 caused by the movement of the shift rod 83.

In this engaged state, the side gear 29 and the drive shaft 33 of the input shaft are integrated with each other, and differential lock is performed.

Next, the operation of one embodiment of the present invention having the above structure will be described.

While the vehicle is traveling, the propeller shaft 47 causes vertical vibration and longitudinal movement. This movement is transmitted to the universal short 51 and the sleeve yoke 49 connected to the propeller shaft 47, and the movement is allowed by the spline 37 in which the sleeve yoke 49 and the drive shaft 35 mesh, and the power from the drive shaft 35 is appropriate and smooth. Will be transmitted to the rear wheels.

As the sleeve yoke 49 slides back and forth, a first oil reservoir 69 of lubricating oil formed between the end portions of the drive shaft 35 and the sleeve yoke 49, and a second oil reservoir provided in the bearing portion 53 of the housing 1. Lubricating oil from the inside of the housing 1 is suctioned and stored in the first oil reservoir 69 through the spline 57 and in the second oil reservoir 75 through the spiral groove 77 provided in the bush 55.

Then, the lubricating oil in the first oil sump 69 is pushed out, and the lubricating oil supply hole
The oil is supplied from 43 to the inside of the differential case 7 through the lubricating oil passage 41 of the sliding portion 39.

At this time, since the second oil sump 75 is constantly filled with a large amount of lubricating oil by the lubricating oil passage 45, the forward and backward movement of the sleeve yoke 49 constantly causes a new lubricating oil to pass through the communication hole 71 and the first lubricating oil.
The oil can be supplied to the oil sump 69 without interruption.

In addition, lubrication of the bush 55 can obtain another effect of preventing wear of the bush because new lubricating oil is constantly flowing.

As described above, the supply of the lubricating oil into the differential case 7 is performed by the centrifugal force of the rotating differential case 7, as well as the vertical vibration of the propeller shaft 49 and the forced oil supply due to the forward and backward movements. Even during the required differential rotation, the gear transmission mechanism 21 in the differential case 7 is sufficiently and reliably lubricated.

[Advantages of the Invention] With the lubricating oil supply mechanism according to the present invention, the second oil sump that can supply a large amount of lubricating oil by using the vertical vibration and the forward / backward movement of the propeller shaft during traveling to move the sleeve yoke forward / backward. Since the first oil reservoir communicating with the engine expands and contracts, a large amount of lubricating oil can be reliably supplied to the internal lubrication portion of the rotating body in the rotating state, so that the gear transmission mechanism can be sufficiently and reliably lubricated. it can.

[Brief description of drawings]

1 is an overall sectional view of a lubricating oil supply mechanism of a power transmission device of the present invention, FIG. 2 is an enlarged sectional view of an essential part showing a second oil reservoir, and FIG. 3 is a sectional view taken along line III-III of FIG. It is a figure. 1 ... Housing 7 ... Differential case (rotating body) 17 ... Drive shaft (first output shaft) 21 ... Gear transmission mechanism 33 ... Drive shaft (input shaft), 35 ... Drive shaft (second output shaft) 39 ... Sliding part , 41 ... Lubricating oil passage 43 ... Lubricating oil supply hole (through hole), 47 ... Propeller shaft 49 ... Sleeve yoke, 51 ... Universal joint 53 ... Bearing part (extension part), 69 ... First oil sump 71 ... Communication hole, 75 ... Second oil sump

Claims (1)

[Scope of utility model registration request] 1. A differential case, a pinion shaft, a pinion gear rotatably supported by the pinion shaft, and a pair of side gears meshing with the pinion gear. An input shaft is provided so that the rear end is rotatably slidably supported on the sliding portion of the other side gear, which is open at the front end, and the differential case is formed integrally with one side gear and the first output is provided. It is provided so that it is connected to the shaft by a chain, etc., and the other side gear is extended to the opposite side on the same axis as the input shaft.
It is provided as an output shaft, and the rear end side of this second output shaft is spline-connected to the sleeve yoke of the propeller shaft,
Both ends of the differential case are rotatably supported by partition walls in a housing of a vehicle transmission, and the sleeve yoke is rotatably supported by an extension portion of the housing, and the latter support prevents the sleeve yoke from vibrating during vehicle running. Is configured to be slidable with respect to the second output shaft and the extension portion, and a space between the rear end surface of the second output shaft and the bottom surface of the spline fitting hole of the sleeve yoke is formed with a spline gap. It is provided as a first oil reservoir communicating with the space in the housing, a through hole communicating with the second output shaft from the rear end surface to the sliding portion is provided, and the sliding portion communicates with the inside of the differential case. And a sealed second oil reservoir communicating with a space inside the housing is provided at a rear portion of the inner hole of the housing extension.
A lubricating oil supply mechanism for a power transmission device, wherein a communication hole that connects the oil reservoir and the first oil reservoir is provided to penetrate the sleeve yoke.