JPH0645733Y2 - Lubrication structure of transfer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a lubrication structure of a transfer device, and more particularly to lubrication of a synchronous meshing device in a transfer of a four-wheel drive vehicle equipped with a two-wheel / four-wheel switching mechanism. Regarding the structure.

[Prior Art] In a sub transmission in a four-wheel drive vehicle equipped with a two-wheel / four-wheel switching mechanism, in a bearing retainer of the sub-transmission,
An oil pump, which is driven by the input shaft and supplies lubricating oil to the lubricated parts housed in the casings of the auxiliary transmission and the transfer, is concentrically provided. A lubricating structure for an auxiliary transmission is known in which lubricating oil is pressure-fed to a lubricating oil passage opened in a portion, that is, a bearing portion, and the lubricating oil is supplied to each bearing portion (JP-A-61-270562). .

In this known lubrication structure, it is necessary to increase the discharge pressure of the oil pump in order to lubricate a portion that is distant from the output shaft in the radial outward direction, for example, a synchronous meshing device.
On the contrary, when the discharge pressure of the oil pump is insufficient, there is a problem that sufficient lubrication is not performed in such a portion.
Therefore, a lubricating structure for the auxiliary transmission and the transfer has been proposed in which an oil path is provided in addition to the above-mentioned lubricating structure, and the lubricating oil is supplied to the lubricating portion of the two-wheel / four-wheel switching mechanism of the transfer by this oil path. .

This oil path is arranged above the planetary gear mechanism and the two-wheel / four-wheel switching mechanism over the mechanisms, and is arranged with a downward gradient from the planetary gear mechanism to the planetary gear mechanism. A gutter having a concave cross section for capturing the lubricating oil scraped up by the rotation of the planetary gear mechanism and guiding the lubricating oil to the upper part of the two-wheel / four-wheel switching mechanism by the gradient of the oil path. The lubricating oil is dropped from a through hole formed at the bottom of the oil path so that the lubricating oil is applied to a lubricated portion such as a synchronous meshing mechanism of a two-wheel / four-wheel switching mechanism. An example of such an oil path is disclosed in Japanese Patent Application No. 62-167392.

[Problems to be solved by the device]

However, in the lubrication structure of the auxiliary transmission and the transfer provided with such an oil path, the lubricating oil to be captured in the oil path is pumped by the oil pump to lubricate each lubricated part, for example, the bearing part, and then the planetary gear mechanism or the like. Since the lubricating oil is scraped up by the oil, the oil temperature of the lubricating oil is high and the lubricating performance is deteriorated. Therefore, even if such lubricating oil is supplied through the oil path, effective lubrication of the synchronous meshing device is performed. There was a problem of not having.

The present invention has been made in view of the above point, and in a transfer lubrication structure including a two-wheel / four-wheel switching mechanism, without significantly increasing the discharge pressure of the oil pump, and further, assembling the transfer case. With the structure that does not interfere with the above, it is an object to supply the lubricating oil directly from the oil pump to the synchromesh device, thereby smoothly and effectively lubricating the synchromesh device.

[Means for Solving the Problems]

In order to achieve the above object, the present invention has first and second cases and a two-wheel / four-wheel switching mechanism, in which an input shaft portion penetrates an end wall of the first case, A lubrication structure of a transfer in which a synchronous meshing device of a four-wheel / four-wheel switching mechanism is arranged in the first and second cases, is arranged on an input shaft of the transfer, and a fluid is stored in an oil reservoir via an intake pipe. An oil pump, which is in communication with each other, sucks lubricating oil from the oil reservoir and discharges the lubricating oil, and an oil pump which is formed in the shaft core of the output shaft and is in fluid communication with the discharge port of the oil pump. And a first lubricating oil passage configured to guide the lubricating oil to each lubricating portion, the oil pump being adjacent to the end wall on the outer side of the first case. Is placed in direct fluid communication with the outlet of the oil pump A second lubricating oil passage having an opening for discharging lubricating oil is provided in the synchronous meshing device of the two-wheel / four-wheel switching portion of the transfer, and the second lubricating oil passage is a pipe line penetrating the end wall. The lubrication structure of the transfer is characterized in that the pipeline is formed by a pipe supported by the end wall and extending from the end wall into the second case.

[Action]

With the configuration of the present invention, the lubricating oil sucked from the oil reservoir by the oil pump through the suction pipe is pressure-fed to the first lubricating oil passage by the oil pump and supplied to the bearings, the planetary gear mechanism, and the like. At the same time, the oil is pumped through the second lubricating oil passage that is in direct fluid communication with the discharge port of the oil pump, and from the opening formed in the second lubricating oil passage to the synchronous meshing device of the two-wheel / four-wheel switching portion of the transfer. It is discharged and supplied to the lubricated portion of the synchronous meshing device. Moreover, the second lubricating oil passage penetrating the end wall is formed independently of the first lubricating oil passage formed in the shaft core of the output shaft, and the second lubricating oil passage is It is formed by a pipe supported on the wall and extending toward the second case. Therefore, according to the above structure, the discharge pressure of the oil pump is not significantly increased, and the two pipes of the lubricating oil have a lubricating structure that does not hinder the assembly of the first and second cases due to the routing of the pipes. It can be smoothly supplied to the synchronous meshing device of the four-wheel switching unit.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a detailed view of the configuration of an auxiliary transmission 2 and a transfer device 3 having a lubricating structure according to the present invention.

As shown in FIG. 1, an auxiliary transmission 2 and a transfer device 3 are disposed on the rear side of the vehicle body of the main transmission 1. The output shaft 5 of the sub transmission 2 and the transfer device 3 is the main transmission 1.
Output shaft, that is, the auxiliary transmission 2 and the input shaft 23 of the transfer device 3 are concentrically connected, and the front end of the output shaft 5 is connected to the input shaft 23.
Of the input shaft 23 through the needle bearing 29 interposed between the inner peripheral surface of the flange member 27 and the outer peripheral surface of the front end portion of the output shaft 5.
The output shaft 5 is rotatably supported by the rear case 9 via a bearing 10. The flange member 27 of the input shaft 23 penetrates the end wall portion 7a of the front case 7. A flange joint 15 protruding rearward from the rear case 9 is fixed to the rear end portion of the output shaft, and a propeller shaft that transmits power to the left and right rear wheels via a differential device or the like (Fig. (Not shown) are connected.

Further, the transfer device 3 is disposed in a chain case portion 12 in which the front case 7 and the rear case 9 are partially extended laterally, and the chain case portion is provided via bearings 13 and 14. The second output shaft 6 is rotatably supported on the shaft 12. A universal joint is provided at the front end of the output shaft 6.
16 is provided, and the output shaft 6 is connected to the left and right front wheels via a universal joint 16, a propeller shaft, a differential device and the like (not shown).

The output shaft 5 carries a sun gear 37, a ring gear 35, a plurality of pinion gears 34 meshingly connecting the sun gear 37 and the ring gear 35, and a plurality of pinion gears on the front end portion thereof, and the output shaft 5 is rotationally integrally connected to the output shaft 5. A planetary gear mechanism A including the carrier 32 is provided. In front of the planetary gear mechanism A, a sub-transmission switching mechanism including a sleeve 41 and a drive force transmission system path switching mechanism (not shown) for moving the sleeve 41 in the axial direction is arranged.
The speed change between the output shaft 5 and the output shaft 5 is performed.

The inner circumference and the outer circumference of the sleeve 41 mesh with the spline 39 of the flange member 27 and the spline 36 of the sun gear 37, respectively, and the spline 30 of the ring member 31 integrally attached to the carrier 32. With the spline 40 formed as described above, the sleeve 41 is selectively engaged with the sun gear 37 or the ring member 31 by pressing and moving the sleeve 41 in the axial direction by the drive force transmission system path switching mechanism, and the sleeve 41 is Via input shaft 23 and sun gear 37,
Alternatively, the input shaft 23 and the ring member 31 are selectively connected,
As a result, gear shifting is performed.

Behind the planetary gear mechanism A, an inter-axle differential device, that is, a center differential 17, which is composed of a planetary gear mechanism, is arranged. The planetary gear mechanism is a ring gear 17a formed integrally with a carrier 32.
And a sun gear 17c integrally formed with the output shaft 5, and a pinion gear for meshingly connecting the single gear 17a and the sun gear 17c.
17b and a carrier that rotatably supports the pinion gear 17b
It is composed of 17d and. Further, behind the center differential 17, there is a bearing sleeve 18 that is integrated with the carrier 17d.
A sprocket 19 is externally fitted to the output shaft 5 so as to be rotatable relative to the output shaft 5, and a chain 21 is provided between the sprocket 19 and a driven sprocket 20 integrally formed with the second output shaft 6.
Is wrapped around. A drive mode switching mechanism 22 is disposed further behind the sprocket 19, and the drive mode switching mechanism 22 is a gear fitted to the output shaft 5 so as to rotate integrally therewith.
5b and clutch hub 22 that rotates integrally with the bearing sleeve 18
b, an extension 19a of the sprocket 19 adjacent to the clutch hub 22b, and a sleeve 50 having a spline 51 formed on the outer periphery thereof and adapted to mesh with the original splines 52, 53, 54, There is a synchronous meshing device 60 composed of a synchronizer ring 55 interposed between the sleeve 50 and the sprocket 19. This drive mode switching mechanism 22 switches the drive force transmission system path by pressing and moving the sleeve 50 in the axial direction by the shift fork 56, whereby the two-wheel drive mode, the four-wheel drive mode of the center differential lock, and the center differential free mode. The four-wheel drive mode is selectively obtained.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 4 is a sectional view taken along the line C- of FIG.
The sectional view in the C line is shown.

As shown in FIGS. 2 and 3, the auxiliary transmission 2 and the transfer device 3 include the input shaft 23 outside the end wall portion 7a.
A positive displacement oil pump (for example, a trochoid pump or a gear pump) 100 is arranged above the oil pump 1.
00 is composed of a housing 101, an inner rotor 102, an under rotor 103, and the like. The inner rotor 102 is fitted to the input shaft 23 so as to rotate integrally with the input shaft 23. Further, a substantially arc-shaped suction slot 104 opened between the rotors 102 and 103 on the suction side, an arc-shaped discharge slot 105 opened between the rotors 102 and 103, and each slot 104, 105.
An inlet 106 and an outlet 121, which are in fluid communication with each other, are provided in the pump cover portion. Intake port 1 has a suction pipe 1
09 is connected, a strainer 110 is attached to the suction pipe 109, and both rotors 102 and 103 are rotationally driven by the rotation of the input shaft 23, so that the lubricant oil stored in the oil sump 111 is sucked into the strainer 110 and the suction pipe 109. Oil pump 100 through pipe 109
Is sucked into.

Further, a lubricating oil passage 107 that penetrates the flange member 27 and fluidly communicates with the discharge slot of the oil pump 100 has a main flow passage 108a and a main flow passage 108a that are formed in the axial direction of the shaft core of the output shaft 5.
From the bearings, the planetary gear mechanism, and the like, that is, the sub-flow passage 108b opening to each lubrication portion, is in fluid communication with the lubricating oil passage 108 as the first lubricating oil passage, and the oil pump 1
Lubricating oil discharged by 00 is supplied to each lubricating portion through the lubricating oil passage 108.

On the other hand, the discharge port 121 of the oil pump 100 is connected with a lubricating oil discharge pipe 120 as a second lubricating oil passage formed of a pipe, and the discharge pipe 120 includes the planetary gear mechanism A and the center differential 1.
In order to avoid 7, it first extends laterally and then rearward from the outlet 121 as shown in FIG. 2, and further bends upward as shown in FIG. 1 to extend above the synchronous meshing device.
The discharge pipe 120 further has openings 122 and 123 positioned above the synchronous meshing device 55, and discharges lubricating oil from the openings 122 and 123, thereby supplying the lubricating oil to the synchronous meshing device 55. It should be noted that the discharge pipe 120 is the end wall portion 7a of the front case 7.
First tube portion that extends through the end wall portion 7b of the front case 7
It has 120a and a second tube portion 120b extending from the end wall portion 7b into the rear case 9. The middle portion of the first pipe portion 120a is fitted to the end wall portion 7a by the vibration damping packing 125, and the first pipe portion 120a
The tip end portion of the second pipe portion 120b and the base end portion of the second pipe portion 120b are fitted to the end wall portion 7b by the vibration damping packing 126, and the first and second pipe portions 1
20a and 120b are supported by the end wall portions 7a and 7b.

By disposing such a discharge pipe 120, the oil pump 1
The lubricating oil can be directly supplied to the synchronous meshing device 55 from 00, and the lubricating oil having a relatively low oil temperature and good lubricating performance can be supplied to the synchronous meshing device 55. Also, the discharge pipe 120
Since it is configured by a pipe, the handling in the complicated front case 7 and rear case 9 is easily performed.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

〔effect〕

According to the present invention, in a transfer lubrication structure having a two-wheel / four-wheel switching mechanism, a structure that does not greatly increase the discharge pressure of the oil pump and does not hinder the transfer case assembly is used. Is directly supplied from the oil pump to the synchromesh device, whereby the synchromesh device can be lubricated smoothly and effectively.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an auxiliary transmission and a transfer device having a lubricating structure according to the present invention. FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. FIG. 3 is an enlarged sectional view taken along the line BB in FIG. FIG. 4 is a sectional view taken along the line CC of FIG. 1 …… Main transmission 2 …… Sub transmission 3 …… Transfer device 5,6 …… Output shaft 17 …… Center differential 22 …… Drive mode switching mechanism 23 …… Input shaft 60 …… Synchronous meshing device 100 …… Oil Pump 101 …… Housing 102 …… Inner rotor 103 …… Outer rotor 104 …… Suction slot 105 …… Discharge slot 106 …… Suction port 107 …… Lubricating oil passage 108 …… Lubricating oil passage (first lubricating oil passage) 108a ...... Main flow path 108b …… Sub flow path 109 …… Suction port 110 …… Strainer 111 …… Oil sump 120 …… Discharge pipe (second lubricating oil path) 121 …… Discharge ports 122, 123 …… Opening

Claims (1)

[Scope of utility model registration request] 1. An input shaft portion (23, 2) having first and second cases (7, 9) and a two-wheel / four-wheel switching mechanism (22).
7) penetrates the end wall (7a) of the first case (7) and
The synchronous engagement device (60) of the wheel-to-wheel switching mechanism has the first and second
Lubrication structure of the transfer placed in the case of the transfer, which is placed on the input shaft (23, 27) of the transfer, communicates with the oil reservoir through the suction pipe, and sucks the lubricating oil from the oil reservoir. And an oil pump (100) adapted to discharge the lubricating oil, and an output shaft (5) are formed in the shaft core portion, are in fluid communication with the discharge port of the oil pump, and are opened at each lubrication site, In a lubrication structure having a first lubrication oil passage (108) adapted to guide lubrication oil to each lubrication site, the oil pump is provided on the end wall (7a, 7b) outside the first case. A second lubricating oil passage (120) disposed adjacent to each other and having an opening for directly communicating with the discharge port of the oil pump and discharging the lubricating oil to the synchronous meshing device of the two-wheel / four-wheel switching portion of the transfer. Is provided, and the second lubricating oil passage is
A transfer characterized by comprising a pipe passing through the end wall (7a, 7b), the pipe being formed by a pipe supported by the end wall and extending from the end wall into the second case. Lubrication structure.