JP3646481B2 - Transfer lubricator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transfer lubrication device, and more particularly to a transfer lubrication device capable of performing lubrication even in a place where no oil supply source is present.
[0002]
[Prior art]
BACKGROUND ART A vehicle is provided with a power transmission device including a transmission for converting the driving force of an engine as required according to traveling conditions and taking it out, a transfer for distributing the driving force, and the like.
[0003]
In the transfer, the transfer case is composed of a front case, a center case, and a rear case, and the transfer input shaft is rotatably provided on the front case by a front bearing. The center case and the rear case are the same as the transfer input shaft. A transfer rear output shaft is rotatably provided on the shaft center by a center bearing and a rear bearing, and a transfer counter shaft is rotatably provided in parallel with the transfer input shaft and the transfer rear output shaft on the front case and the center case. The case and the rear case are provided with a transfer front output shaft that is parallel to the transfer rear output shaft by two driven bearings, and a transfer drive sprocket is rotatably provided on the transfer rear output shaft. Trang The transfer driven sprocket is fixedly provided to correspond to the drive sprocket. There is a configuration in which a two-wheel / four-wheel switching mechanism is provided in which the driving force of the output shaft is intermittently switched to a transfer drive sprocket to switch between two-wheel drive and four-wheel drive.
[0004]
Further, as a lubricating device for such a power transmission device, for example, Japanese Utility Model Laid-Open No. 2-146260, Japanese Utility Model Laid-Open No. 6-54948, and Japanese Patent Application Laid-Open No. 9-14384 are disclosed. Japanese Utility Model Laid-Open No. 2-146260 includes an oil pump that is driven by an output shaft of a transmission, and the suction port of the oil pump is formed at the bottom of the transfer case, and the chain arrangement portion and the partition plate are provided. The oil pump discharge port is connected to the shaft hole of the output shaft, and the oil discharged from the oil pump is passed through the shaft hole of the output shaft and the shaft hole of the transfer shaft. Supplied to the lubrication part. Japanese Utility Model Laid-Open No. 6-54948 discloses a transmission having a sub-transmission that further switches the shift stage of the main transmission between high and low, and the counter shaft of the sub-transmission is inclined with respect to the counter shaft of the main transmission. By arranging the center distance between the gears to be large relative to the main transmission at the upper height position, only the gear diameter of the sub-transmission can be designed large without changing the gear diameter of the main transmission, This ensures sufficient gear strength of the sub-transmission without increasing the size of the entire transmission. Japanese Patent Application Laid-Open No. 9-14384 discloses a case outer peripheral surface of a portion of a joint mechanism that generates heat, which also serves as a feeding mechanism that feeds cooling oil to a joint mechanism in a distribution case of a vehicle power distribution device. By providing a drive mechanism that drives the oil feeding mechanism by transmitting the rotational force by frictional contact, the drive mechanism that drives the oil feeding mechanism is simplified, the cost is reduced, and noise from the drive mechanism is further reduced. The generation is prevented and the cooling efficiency is increased.
[0005]
[Problems to be solved by the invention]
However, in a conventional transfer provided with a two-wheel four-wheel switching mechanism, the two-wheel four-wheel switching mechanism is located between the center case and the transfer chain. There is a disadvantage that the oil supply source is lost in the synchro portion and the periphery thereof, resulting in poor lubrication.
[0006]
[Means for Solving the Problems]
Accordingly, in order to eliminate the inconvenience described above, the present invention comprises a transfer case including a front case, a center case, and a rear case, and a transfer input shaft is rotatably provided on the front case by a front bearing. And a rear case, a transfer rear output shaft is rotatably provided by a center bearing and a rear bearing on the same axis as the transfer input shaft, and the transfer input shaft and the transfer case are provided between the front case and the center case. A transfer counter shaft is rotatably provided in parallel with the rear output shaft. A transfer front output shaft parallel to the transfer rear output shaft is rotatably provided in the center case and the rear case by a driven-side bearing. Transfer drive on output shaft A rocket is rotatably provided, and a transfer driven sprocket is fixed to the transfer front output shaft corresponding to the transfer drive sprocket, and the transfer drive sprocket and the transfer driven sprocket are provided by winding a transfer chain, Two-wheel four-wheel switching for switching the driving force of the transfer rear output shaft to the two-wheel drive and the four-wheel drive by intermittently connecting the driving force of the transfer rear output shaft to the transfer drive sprocket from the center bearing to the transfer drive sprocket side. In the transfer lubrication device for lubricating the two-wheel four-wheel switching mechanism, a rib protruding below the two-wheel four-wheel switching mechanism and along the transfer rear output shaft is provided in the center case. The rib is characterized in that a plate forming the oil reservoir portion so as to immerse a portion of the two-wheel four-wheel switching mechanism in the oil by retention of oil.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, when oil stays in the oil reservoir, the oil immerses the synchro part and its periphery of the two-wheel / four-wheel switching mechanism, so that the synchro part and its periphery can be lubricated and cooled even in the two-wheel drive state. In addition, the lubrication performance can be improved and the cooling effect can be improved even at locations where there is no oil supply source.
[0008]
【Example】
Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 11 show an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a transfer of a part-time four-wheel drive vehicle (4WD) having a front wheel as a driven side wheel, and 4 denotes a transfer case.
[0009]
The transfer case 4 includes a front case 6, a center case 8, and a rear case 10.
[0010]
A transfer input shaft 16 is rotatably provided on the front wall portion 12 of the front case 6 by a front bearing 14.
[0011]
On the center wall 18 of the center case 8 and the rear wall 20 of the rear case 10, a transfer rear output shaft 26 is rotatably provided by a center bearing 22 and a rear bearing 24 on the same axis as the transfer input shaft 16. It has been.
[0012]
Further, a transfer counter shaft 28 is rotatably provided in parallel with the transfer input shaft 16 and the transfer rear output shaft 26 on the front wall portion 12 of the front case 6 and the center wall portion 18 of the center case 8. The transfer counter shaft 28 is disposed in a gear chamber 32 that is connected to the center wall portion 18 and is formed by a chamber forming wall portion 30. A transfer front output shaft 36 is first and second driven in parallel with the transfer rear output shaft 26 on the shaft support portion 34 connected to the chamber forming wall portion 30 of the center case 8 and the rear wall portion 20 of the rear case 10. The side bearings 38-1 and 38-2 are rotatably provided.
[0013]
A transfer drive sprocket 40 is rotatably provided on the transfer rear output shaft 26 in the rear case 10. A transfer driven sprocket 42 is fixedly provided on the transfer front output shaft 36 corresponding to the transfer drive sprocket 40. A transfer chain 44 is wound around the transfer drive sprocket 40 and the transfer driven sprocket 42.
[0014]
A transfer drive gear 46 is provided on the transfer input shaft 16. The transfer counter shaft 28 is provided with a transfer driven gear 48 that meshes with the transfer drive gear 46.
[0015]
The transfer counter shaft 28 is provided with a reduction drive gear 50. The transfer rear output shaft 26 is provided with a reduction driven gear 52 that meshes with the reduction drive gear 50.
[0016]
Further, a low speed / high speed switching mechanism 58 having a low speed / high speed switching hub 54 and a low speed / high speed switching sleeve 56 is provided between the transfer drive gear 46 and the reduction driven gear 52.
[0017]
Further, the transfer rear output shaft 26 closer to the transfer drive sprocket 40 than the center bearing 22 is a two-wheel drive in which the driving force of the transfer rear output shaft 26 is intermittently connected to the transfer drive sprocket 40 to switch between two-wheel drive and four-wheel drive. A four-wheel switching mechanism 60 is provided.
[0018]
The two-wheel four-wheel switching mechanism 60 is made of a synchro part, and includes a two-wheel four-wheel switching hub 62 fixed to the transfer rear output shaft 26, and a shaft side gear 64 integral with the two-wheel four-wheel switching hub 62. A two-wheel / four-wheel switch key 66; a sprocket-side gear 68 integral with the transfer drive gear 46; and a two-wheel / four-wheel switch sleeve 70 for intermittently connecting the shaft-side gear 64 and the sprocket-side gear 68. .
[0019]
The center wall 18 of the center case 8 is provided with a rib 72 that projects below the two-wheel / four-wheel switching mechanism 60 and along the transfer rear output shaft 26.
[0020]
A plate for forming an oil reservoir 74 on the projecting end face of the rib 72 so that the oil as a lubricating oil is retained and the oil is immersed in and around the synchro part which is a part of the two-wheel / four-wheel switching mechanism 60. 76 is attached with a fixing screw 78.
[0021]
As shown in FIG. 7, the plate 76 has a shaft recess 80 and three screw insertion holes 82 through which the fixing screws 78 are inserted. Further, as shown in FIG. 6, the center case 8 is formed with three screw holes 8 a that match the screw insertion holes 82.
[0022]
3 and 4, a through hole 84 is formed in the center case 8, and the center case 8 is scraped up by each gear provided on the transfer input shaft 16 and the transfer counter shaft 28 through the through hole 84. An oil garter 86 that guides oil to the oil reservoir 74 is attached by a mounting bolt 88. The mounting bolt 88 is screwed into the bolt hole 8b as shown in FIG.
[0023]
As shown in FIGS. 8 to 11, the oil garter 86 is provided with an oil flow passage 90 that opens upward, and a mounting bracket 94 in which a bolt insertion hole 92 is formed.
[0024]
A chain chamber 96 is formed on the transfer chain 44 side with the chamber forming wall 30 as a boundary. Further, as shown in FIG. 3, an oil hole 98 is formed in the chamber forming wall 30, so that the oil bells L of the gear chamber 32 and the chain chamber 96 are the same.
[0025]
Next, the operation of this embodiment will be described.
[0026]
In the oil reservoir 74, the oil flowing out from the center bearing 22 stays, and the oil scraped up by each gear is guided to the oil garter 86 and stays there.
[0027]
At this time, a large amount of oil flows out from the center bearing 22 at a low rotation, while the oil is small at a high rotation. In addition, the amount of oil scooped up by each gear is small at low rotations, but increases at high rotations.
[0028]
Due to the two oil supply factors, the oil amount is stably supplied to the oil reservoir 74 regardless of the rotational state, and immediately after the two-wheel / four-wheel switching mechanism 60 is stopped, the synchro parts at locations where there is no oil supply source are removed. The oil can be lubricated and cooled, and if time passes after stopping, the oil is removed from the center bearing 22, so that there is almost no remaining amount of oil in the oil reservoir 74 when the oil is changed.
[0029]
Further, when the two-wheel drive is performed, the synchro parts are not raked up by stopping the transfer chain 44 and the lubrication tends to be insufficient. In this embodiment, however, the transfer 2 is connected to the chain chamber 96 and the gear on the transfer chain 44 side. Since it has two chambers, the chamber 32, each gear of the gear chamber 32 that is always driven pumps up the oil and supplies it to the chain part and the synchro parts to prevent oil shortage and stabilize the oil. The start-up of lubrication at the start can be improved.
[0030]
Further, as shown in FIG. 5, an oil pool is formed by meshing between the reduction drive gear 50 and the reduction driven gear 52, and this oil is scattered to the center bearing 22 side by centrifugal force, and the transfer gear 46 and the transfer driven gear 48. Since the oil is accumulated by the meshing and the oil is scattered to the oil garter 86 side by centrifugal force, the oil supply amount can be stabilized and the oil can be actively supplied to the oil reservoir 74.
[0031]
【The invention's effect】
As is clear from the above detailed description, according to the present invention, the center case is provided with a rib that protrudes below the two-wheel / four-wheel switching mechanism and along the transfer rear output shaft, and oil is retained in the rib. By providing a plate that forms an oil reservoir so that a part of the two-wheel / four-wheel switching mechanism is immersed with oil, the oil staying in the oil reservoir soaks the synchronized part of the two-wheel / four-wheel switching mechanism and its periphery. Therefore, it is possible to lubricate and cool the synchro part and its surroundings, improve the lubrication performance even in a place where there is no oil supply source, and improve the cooling effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a transfer.
2 is a cross-sectional view taken along line 〓-〓 in FIG.
3 is a cross-sectional view taken along the line 〓-〓 in FIG.
FIG. 4 is a cross-sectional view for explaining an attached state of the oil garter.
FIG. 5 is a cross-sectional view illustrating a state of oil scattering.
FIG. 6 is a side view of the center case.
FIG. 7 is a front view of a plate.
FIG. 8 is a plan view of an oil garter.
9 is an enlarged cross-sectional view taken along line 〓-〓 in FIG.
10 is a front view of the oil garter of FIG. 8;
11 is a side view taken along arrow 〓〓 in FIG.
[Explanation of symbols]
2 Transfer 4 Transfer case 8 Center case 16 Transfer input shaft 26 Transfer rear output shaft 36 Transfer front output shaft 60 Two-wheel four-wheel switching mechanism 72 Rib 74 Oil reservoir 76 Plate 86 Oil garter 90 Oil flow passage

Claims (3)

The transfer case includes a front case, a center case, and a rear case, and a transfer input shaft is rotatably provided on the front case by a front bearing, and the center case and the rear case are on the same axis as the transfer input shaft. A transfer rear output shaft is rotatably provided by a center bearing and a rear bearing, and a transfer counter shaft is rotatably provided in parallel with the transfer input shaft and the transfer rear output shaft in the front case and the center case, The center case and the rear case are rotatably provided with a transfer front output shaft parallel to the transfer rear output shaft by a driven bearing, and a transfer drive sprocket is rotatably provided on the transfer rear output shaft. A transfer driven sprocket is fixedly provided on the output shaft in correspondence with the transfer drive sprocket, and the transfer drive sprocket and the transfer driven sprocket are provided by winding a transfer chain on the transfer drive sprocket side of the center bearing. The transfer rear output shaft is provided with a two-wheel four-wheel switching mechanism for switching the driving force of the transfer rear output shaft to the two-wheel drive and the four-wheel drive by intermittently connecting to the transfer drive sprocket. In the transfer lubrication device for lubricating the mechanism, the center case is provided with a rib protruding below the two-wheel / four-wheel switching mechanism and along the transfer rear output shaft. The two wheels with oil Transfer of the lubricating apparatus characterized in that a plate forming the oil reservoir portion so as to immerse a portion of the wheel switching mechanism. A through hole is formed in the center case, and an oil garter that guides the oil scraped up by each gear provided on the transfer input shaft and the transfer counter shaft to the oil reservoir through the through hole is attached. The transfer lubricating device according to claim 1, wherein 2. The transfer lubricating device according to claim 1, wherein the oil reservoir retains oil flowing out of the center bearing.

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