JPH09100900A - Power transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent seizure or abnormal abrasion to improve durability, by flowing down a gathering up oil, collected by an oil gutter, pushing into the diameter direction inner side of an output taxis by an oil energizing means, and leading to respective lubricating places by centrifugal force. SOLUTION: In this constitution, a gathering up oil collected by an oil gutter 81, is led to the diameter direction inner side of a output spindle 37 by an oil energizing means 105, utilizing the oil energizing action by the rotation of a two-thread screw 101, to be led to respective lubricating places by centrifugal force to perform sufficient lubrication. consequently, unlike a conventional example, where forced lubrication is made by an engine-driven oil pump; since structure can be simple, a cost is low, and the respective lubricating places can be sufficiently lubricated, by the own unnecessariness of the oil pump and an oil path for the oil pump; and an oil path for the oil pump; in a transfer 1, the seizure or abnormal abrasion of respective parts can be prevented, thereby sharply improving durability.

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.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 5-42837 discloses a transfer 201 (power transmission device) as shown in FIG.

This transfer 201 is a transmission mechanism 20.
3, center differential 205, differential limiting device 207, chain
The transfer case 211 for housing these components is provided with an oil reservoir.

The speed change mechanism 203 performs two-step speed change of the driving force of the engine and disconnection of the center diff 205, and the center diff 205 distributes the changed driving force to the front wheels via the chain transmission mechanism 209. The rear wheel output shaft 213
Through to the rear wheel side. Further, the differential limiting device 207 limits the differential of the center differential 205 by the multi-plate clutch 215.

[0005]

In such a device having a complicated structure as described above, in order to prevent seizure and uneven wear of each part and maintain a normal function and high durability, each lubrication point is sufficiently lubricated. It is necessary to.

In the transfer 201, the transmission mechanism 203
The oil in the oil sump is pressurized using the oil pump 217 driven by the engine via the oil passages 219, 22.
1, 223, the transmission mechanism 203, through the oil passages 225 in the axial direction provided in the rear wheel output shaft 213 and the oil passages in the radial direction.
The center differential 205, the multiple disc clutch 215 of the limited slip differential device 207, and the like are configured to send oil, and these lubricating points are sufficiently lubricated.

However, although the structure using the oil pump 217 has a great lubricating effect, the oil pump 21
7 and the structure of the oil passage increase the cost, complicate the structure, and reduce the fuel consumption of the engine by the amount of driving the oil pump 217.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power transmission device which has a simple structure and is low in cost, and which can sufficiently lubricate each portion without giving a heavy burden to engine fuel consumption.

[0009]

According to a first aspect of the present invention, there is provided a power transmission device comprising: a casing having an oil reservoir therein; and an oil grate for receiving oil scraped up from the oil reservoir by rotation of the first rotating member. , A first oil flow passage for causing the oil from the oil gutter to flow down, an oil pocket for collecting the oil flowing down from the oil flow passage, and the oil collected in the oil pocket is urged by the rotation of the second rotating member. An oil urging means and a second, which is provided on the second rotating member and guides the urged oil radially inward of the third rotating member
And an oil flow path.

When the first, second and third rotating members rotate,
The oil scraped up from the oil sump is collected from the oil gutter into the oil pocket via the first oil flow path, and the collected oil is energized by the oil energizing means utilizing the rotation of the second rotating member. Then, it is guided to the inside in the radial direction of the third rotating member via the second oil flow path. The oil guided inward in the radial direction is further urged by the centrifugal force caused by the rotation of the third rotating member and the like, and sufficiently lubricates each lubricated portion.

As described above, unlike the conventional example in which forced lubrication is performed by an engine-driven oil pump, an oil guard
The oil pump and the oil passage for the oil pump are unnecessary because the scraping oil collected in the rotor is configured to be guided to the inner side in the radial direction of the rotating member by being urged by the oil urging means utilizing the rotation of the rotating member Above all, the structure is simple, the cost is low, and each lubrication point can be sufficiently lubricated with almost no burden on the fuel consumption of the engine, preventing seizure and abnormal wear of each part, and durability. It is possible to greatly improve the property.

According to a second aspect of the present invention, there is provided a power transmission device according to the first aspect, wherein a screw rotating integrally with the second rotating member and a fixed-side pre-forming plate that forms a gap between the screw and the screw.
And an oil urging unit configured to urge the oil in the gap toward the second oil flow path side by the rotation of the screw.

Similarly to the power transmission device according to the first aspect, the oil scraped up from the oil sump by the rotation of the first rotating member and collected in the oil pocket from the oil gutter through the first oil passage is -The screw is biased by the rotation of the screw in the gap formed between the screw and the screw, and is pushed into the second oil flow passage, and the third oil is passed through the second oil flow passage.
It is sent to the inside of the rotary member in the radial direction and further sent to each lubrication point by centrifugal force to perform sufficient lubrication.

As described above, unlike the conventional example, the oil pump and the oil passage for the oil pump are unnecessary, the structure is simple and the cost is low, and the fuel consumption of the engine is hardly burdened. Can be sufficiently lubricated, seizure and abnormal wear of each part can be prevented, and durability can be greatly improved.

According to a third aspect of the present invention, there is provided the power transmission apparatus according to the first aspect, wherein the distance between the second rotary member and the second rotary member is gradually narrowed along the direction of rotation of the second rotary member. An oil urging means is constituted by a plate having a pump chamber for pressurizing the oil in the rotating and rotating oil pocket and a second oil flow path into which the oil pressurized in the pump chamber flows.

Therefore, the oil that rotates along with the second rotating member due to the viscosity in the oil pocket moves in the pump chamber formed between the rotating member and the plate in the direction in which the distance between them narrows. While being pressurized, when it is pressurized, it flows from the second oil flow path to the inside of the third rotating member in the radial direction, and is further sent to each lubrication point by centrifugal force to perform sufficient lubrication.

As described above, unlike the conventional example, the oil pump and the oil passage for the oil pump are unnecessary, the structure is simple and the cost is low, and the fuel consumption of the engine is hardly burdened. Can be sufficiently lubricated, seizure and abnormal wear of each part can be prevented, and durability can be greatly improved.

A power transmission device according to a fourth aspect of the present invention is the power transmission device according to the first aspect, wherein the cross section from the opening to the discharge portion is gradually narrowed, and the oil pocket rotates together with the second rotating member. Oil urging means including a plate fin having a pump chamber that pressurizes the oil from the opening through the opening and pressurizes the oil in a gradually narrowing section, and a second oil flow path into which the pressurized oil flows from the discharge portion of the pump chamber. Is configured.

Therefore, the oil that rotates along with the second rotating member in the oil pocket is pressurized in its gradually narrowing cross section while moving in the plate fins.
When pressurized, it flows from the second oil flow path to the inside of the third rotating member in the radial direction, and is further sent to each lubrication point by centrifugal force to perform sufficient lubrication.

As described above, unlike the conventional example, the oil pump and the oil passage for the oil pump are unnecessary, the structure is simple and the cost is low, and the fuel consumption of the engine is hardly burdened. Can be sufficiently lubricated, seizure and abnormal wear of each part can be prevented, and durability can be greatly improved.

According to a fifth aspect of the present invention, there is provided the power transmission apparatus according to the first aspect, wherein the second oil passage and the oil in the oil pocket that rotates together with the second rotating member collide with the convex portion. The oil urging means is constituted by a fixed ring that is pushed in the second oil flow path by changing the direction.

Therefore, the oil which rotates along with the second rotating member in the oil pocket collides with the convex portion of the ring and changes its direction, and is pushed into the second oil inflow passage to be pushed into the third rotating member. It flows inward in the radial direction and is sent to each lubrication point by centrifugal force to perform sufficient lubrication.

As described above, unlike the conventional example, since the oil pump and the oil passage for the oil pump are not required, the structure is simple and the cost is low, and the fuel consumption of the engine is hardly burdened. Can be sufficiently lubricated, seizure and abnormal wear of each part can be prevented, and durability can be greatly improved.

A power transmission device according to a sixth aspect of the present invention is the power transmission device according to any one of the first to fifth aspects, wherein the second rotating member is hollow and is coaxially arranged outside the third rotating member.

As described above, even in the structure in which the third rotating member is arranged inside the hollow second rotating member, which is difficult to lubricate,
Oil is sent to the inside of the third rotating member in the radial direction by the oil urging means to sufficiently lubricate each lubricated part, prevent seizure and abnormal wear of each part, and greatly improve durability.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. This embodiment is claim 1,
It has two or six characteristics. FIG. 1 shows a transfer 1 (a power transmission device of this embodiment) of a four-wheel drive vehicle, and the left side of FIGS. 1 and 2 corresponds to the front side of this vehicle. Further, members and the like not given reference numerals are not shown.

As shown in FIG. 1, the transfer 1 includes a center differential 3, a chain transmission mechanism 5, a speed-sensitive differential limiting device 7, and a transfer case 9 (case) for accommodating them.
Sing) etc. This transfer case 9
Is equipped with an oil sump at the bottom.

The center differential 3 is an internal gear 11
And a double pinion planetary gear type differential mechanism having outer and inner pinion gears 13 and 15 and a sun gear 17.

The internal gear 11 is a hollow input shaft 19
The input shaft 19 is integrally formed at the rear end of the (second rotating member), and is connected to the output shaft side of the transmission.

As shown enlarged in FIG. 2, the input shaft 19
Is supported on the transfer case 9 by means of a ball bearing 23 sealed on one side by a rubber ring 21. There is a seal between the input shaft 19 and the transfer case 9.
25 is arranged to prevent oil leakage to the outside. This seal 25, ball bearing 23, and input shaft 1
Oil pocket 27 between 9 and transfer case 9
Are formed.

The outer and inner pinion gears 13, 15 are
Pinion shaft 31 through bearing 29 respectively
Each pinion shaft 31 is supported at both ends by front and rear pinion carriers 33 and 35. The pinion carriers 33 and 35 are connected to each other, and the front pinion carrier 33 is connected to the rear wheel output shaft 37 (the third pinion carrier).
(Rotary member) is splined.

The front end of the output shaft 37 is supported on the inner circumference of the input shaft 19 via a bearing 39, and the rear end side is supported on the transfer case 9 via a ball bearing 41. As shown in FIGS. 1 and 4, a flange 43 is spline-connected to the output shaft 37, and the flange 43 is connected to a rear wheel-side transmission shaft. A seal 45 is arranged between the flange 43 and the transfer case 9 to prevent oil leakage to the outside.

The sun gear 17 is a hollow sprocket 47.
It is integrally formed on the front end side of the (first rotating member). The sprocket 47 is supported on the outer circumference of the output shaft 37 via needle bearings 49, 49. Further, sliding washers 51, 53 are arranged between the input shaft 19 and the front pinion carrier 33 and between the sprocket 47 and the pinion carrier 33 to reduce the sliding resistance therebetween.

The chain transmission mechanism 5 comprises the sprocket 47, another sprocket 55 (first rotating member), and a chain 57 (first rotating member) connecting them. The sprocket 55 is formed integrally with the transmission shaft 59 on the front wheel side. The transmission shaft 59 is arranged parallel to the output shaft 37 and is supported on the transfer case 9 by ball bearings 61, 61. Figures 1 and 3
As described above, the flange 63 is spline-connected to the transmission shaft 59, and the flange 63 is connected to the front-wheel-side transmission shaft. A seal 65 is arranged between the flange 63 and the transfer case 9 to prevent oil leakage to the outside.

The driving force of the engine for rotating the input shaft 19 is distributed by the center differential 3, and the pinion carrier 33,
It is transmitted to the output shaft 37 via 35, and is transmitted from the sun gear 17 to the transmission shaft 59 via the chain transmission mechanism 5.
The rotation of the output shaft 37 is distributed to the left and right rear wheels via a rear differential (a differential device arranged on the axle on the rear wheel side) and the rotation of the transmission shaft 59 is arranged on the front differential (located on the axle on the front wheel side). It is distributed to the left and right front wheels via a differential device).

When a driving resistance difference occurs between the front and rear wheels on a bad road or the like, the driving force of the engine is differentially distributed to the front and rear sides by the rotation of the pinion gears 13 and 15.

The differential limiting device 7 has an outer housing 67.
The larger the relative rotation speed between the inner hub 69 and the inner hub 69, the more the differential rotation is suppressed. For example, an oil pump type coupling device is used, and seals 71, 71 for sealing oil are arranged. The housing 67 is splined to the sprocket 47, and the hub 69 is splined to the output shaft 37. Thus, the differential limiting device 7 limits the differential of the center differential 3. This differential limiting force has a speed-sensitive differential limiting characteristic that increases as the differential rotation speed between the front and rear wheels increases.

As described above, the front end of the output shaft 37 to which the hub 69 is connected is supported by the transfer case 9 through the bearing 39, the input shaft 19 and the ball bearing 23, and the output shaft 37 of the output shaft 37 is supported. The rear end is supported by the transfer case 9 via a ball bearing 41, and the sprocket 47 to which the housing 67 is connected is the bearing 4
It is supported on the outer circumference of the output shaft 37 via 9, 49.
Therefore, the adverse effects of the rotational vibration of the housing 67 and the hub 69 are exerted on these bearings 23, 39, 41, 49, 4
The gear 9 is cut off from the center differential 3 to prevent defective tooth contact, breakage, noise and the like of each gear.

As shown in FIG. 3, the oil level 73 of the oil sump provided in the transfer case 9 is at a level that is appropriately above the center of the front wheel side sprocket 55 of the chain transmission mechanism 5. When the chain transmission mechanism 5 rotates in the direction of the arrow 56 in FIG. 3, the chain 57 scrapes up the oil in the oil sump as shown by the arrows in FIGS.

Further, as shown in FIG. 4, a drain plug 75 for removing the oil in the oil reservoir is attached to the lower portion of the transfer case 9, and a filler plug 77 for oil injection is provided above the drain plug 75. Is attached.
Further, air is allowed to flow into and out of the transfer case 9 while preventing the oil from being blown out.
An air breather 79 that keeps the internal pressure of the gas 9 constant is attached.

As shown in FIGS. 1 and 3, the transfer case 9
The oil garter 81 is attached by inserting both ends thereof into recesses 83 and 85 provided in the transfer case 9. The oil gun 81 is a plastic tray.
As shown in FIGS. 5 to 10, the oil outlets 87 and 89 are provided at both ends, and the partition plate 91 is provided at the center. FIG. 5 is a bottom view of the oil garter 81.
6 is a side view of the one side, and FIG. 7 is a side view of the other side. 8 is a sectional view taken along the line CC of FIG. 5, FIG. 9 is a view taken from the same arrow D, and FIG. 10 is a view taken from the same arrow E.

In the transfer case 9, an oil flow passage 93 (first oil flow passage) is formed on the side of the flow-out port 87 of the oil gar 81. As described above, the oil pocket 27 is formed between the seal 25, the ball bearing 23, the input shaft 19 and the transfer case 9, and the oil flow passage 93 is formed in the direction of gravity from the oil pocket 27. The oil gar 81 is arranged above and is formed so as to extend from the downflow opening 87 of the oil garter 81 toward the oil pocket 27 along the direction of gravity. The downflow opening 87 of the oil gar 81 and the oil pocket 27 are communicated with each other. The oil is allowed to flow down into the oil pocket 27. A blind plug 95 is attached to the outer opening of the oil passage 93 to prevent oil leakage.

As shown in FIGS. 1 and 2, a plate 97 is fixed to the transfer case 9 inside the oil pocket 27, and a double thread 101 (screw) is formed on the boss portion 99 of the input shaft 19. Has been done. A gap 103 is provided between the double thread 101 and the plate 97. Thus, the oil urging means 105 is constituted.

Further, the oil passage 10 is formed in the boss 99.
7 (second oil passage) is formed, and the input shaft 19
A plug 109 is attached to the inner circumference of the to prevent oil from leaking to the outside. Further, the output shaft 37 is formed with axially and radially oil passages 111 and 113 communicating with each other.

As described above, when the chain transmission mechanism 5 rotates, the oil scraped up by the chain 57 bounces directly or on the inner wall of the transfer case 9 as shown by the arrow in FIG. Are collected in the oil gar 81.

The oil behind the partition plate 91 of the oil gutter 81 flows down from the downflow port 89 as shown by the arrow in FIG. 1, and the bearing 41 and the housing 67 of the differential limiting device 7 are provided.
115, washer 115 between bearing and bearing 41
After lubricating the gear 117 for the engine, etc., it returns to the oil sump.

The oil in front of the partition plate 91 is
As shown by the arrow in FIG. 1, the oil flow path 93 flows down from the downflow opening 87 and is collected in the oil pocket 27. The oil in the oil pocket 27 is urged by the rotation of the double-thread screw 101 in the gap 103 between the double-thread screw 101 and the plate 97, and passes through the oil flow path 107 to the axis of the output shaft 37. It is pushed into the formed oil passage 111 in the axial direction.

The oil pushed in is sent from the bearing 39, washers 51, 53 to each gear of the center differential 3 by the centrifugal force to lubricate them, and further, from the oil passage 111 in the radial direction. Lubricate the needle bearings 49, 49, etc. via 113 and return to the oil sump.

The transfer 1 is thus constructed.

As described above, in this transfer 1,
The scraping oil collected by the oil gutter 81 is guided inward in the radial direction of the output shaft 37 by the oil biasing means 105 utilizing the biasing action of the oil by the rotation of the double-thread screw 101, and this oil is centrifugally separated. It was sent to the lubrication point and configured to perform sufficient lubrication.

Therefore, unlike the conventional example in which forced lubrication is performed by an engine-driven oil pump, the structure is simple, the cost is low, and the fuel consumption of the engine is low because the oil pump and the oil passage for the oil pump are unnecessary. Since each lubricated part can be sufficiently lubricated with almost no burden, seizure and abnormal wear of each part of the transfer 1 are prevented, and the durability is greatly improved. Further, since the oil passage 93 is formed in the case 9 between the seal 25 and the bearing 23, the press-fitting margin of the bearing 23 into the case 9 can be sufficiently secured around the entire circumference, and the bearing 23 is a single-sealed bearing. As a result, the oil pocket 27 that can secure a large amount of static pressure oil can be formed. Further, since the oil flow path 93 is arranged above the oil pocket 27 in the direction of gravity and extends along the direction of gravity from the outlet 87 of the oil garter 81 toward the oil pocket 27, the oil collected in the oil garter 81 is collected. Since the oil is always stored in the oil flow path 93, the self-weight of the oil acts to promote the biasing of the oil, and the oil can be efficiently introduced into the oil flow path 107.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows the transfer 119 (second
The power transmission device of the embodiment is shown, and this embodiment has the features of claims 1, 3, and 6.

The description of the transfer 119 and FIG.
In 1 and 12, the members having the same functions as those of the first embodiment are denoted by the same reference numerals, and duplicate description of these members having the same functions is omitted.

As shown in FIG. 11, a plate 121 is fixed inside the oil pocket 27 of the transfer case 9. The circular oil guide portion 123 formed on the plate 121 has an elliptical shape which is offset from the boss portion 99 of the input shaft 19 by the offset amount a as shown in FIG. A crescent-shaped pump chamber 125 having a gradually narrowing interval along the rotation direction of 99 is formed. The second oil passage 107 of the input shaft 19 communicates with this pump chamber 125.

Thus, the oil urging means 127 is constructed.

As shown by the arrow in FIG. 12, no matter which direction the input shaft 19 rotates, the oil in the oil pocket 27 which rotates together with the input shaft 19 moves toward the narrower space of the pump chamber 125. Then, the oil is pushed into the oil flow path 107 when it is pressurized.

The oil pushed in is sent from the bearing 39 and washers 51, 53 to each gear of the center differential 3 by a centrifugal force to lubricate them, and further, from the oil passage 111 in the radial oil passage. Lubricate the needle bearings 49, 49, etc. via 113 and return to the oil sump.

As described above, in the transfer 119, the scraped oil is collected by the oil gutter 81, flows down to the oil pocket 27, is pressurized in the crescent-shaped pump chamber 125, and is guided inward in the radial direction of the output shaft 37. The oil was sent to each lubrication point by centrifugal force so that sufficient lubrication was performed.

Thus, unlike the conventional example in which forced lubrication is performed by an engine-driven oil pump, the structure is simple, the cost is low, and the fuel consumption of the engine is low because the oil pump and the oil passage for the oil pump are unnecessary. Since oil can be introduced to the inside of the rotating output shaft 37 in the radial direction with almost no load, and each lubricated portion can be sufficiently lubricated, the transfer 119 prevents seizure and abnormal wear of each portion. , Durability is greatly improved.

Since the oil passage 93 is formed in the case 9 between the seal 25 and the bearing 23, the margin for press-fitting the bearing 23 into the case 9 can be sufficiently secured over the entire circumference, and the bearing 23 can be sealed on one side. Oil pocket 2 that can secure a large amount of static pressure oil by using bearings
7 can be formed. Further oil pocket 2
7 is arranged above gravity direction 7 and has an oil garter 81.
Since the oil passage 93 is formed along the direction of gravity from the flow-out port 87 toward the oil pocket 27, the oil collected in the oil garter 81 is always stored in the oil passage 93, so that the weight of the oil itself is reduced. It acts to promote the urging of the oil, and the oil can be efficiently introduced into the oil passage 107.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 13 shows the transfer 129.
(Power transmission device of the third embodiment) is shown, and this embodiment has the features of claims 1, 4, and 6.

The description of the transfer 129 and FIG.
In 3, 14, and 15, members having the same functions as those of the above-described embodiments are denoted by the same reference numerals, and duplicate description of these members having the same functions is omitted.

As shown in FIG. 13, the transfer case 9 has a plate fin 131 inside the oil pocket 27.
Has been fixed. As shown in FIG. 14 and FIG.
To fin 131 has four fins 133 equidistant in the circumferential direction.
Are provided, and these fins 133 are provided in each opening 13
A pump chamber 139 is formed in which the cross section from 5 to the discharge portion 137 is gradually narrowed. Second oil flow path 107
Communicate with each pump chamber 139.

In this way, the oil urging means 141 is constituted.

When the input shaft 19 rotates in the direction of the arrow in FIG. 14, the oil in the oil pocket 27 which rotates together with the input shaft 19 enters the pump chamber 139 from the openings 135 of the fins 133 and gradually cross-sections. Pump room 1
39 is moved and pressurized, and the pressurized oil is pushed into the oil flow path 107 when the oil flow path 107 (input shaft 19) rotates to the discharge portion 137.

The oil pushed in is sent from the bearing 39 and washers 51, 53 to each gear of the center differential 3 by a centrifugal force to lubricate them, and further, from the oil passage 111 in the radial oil passage. Lubricate the needle bearings 49, 49, etc. via 113 and return to the oil sump.

As described above, in the transfer 129, the scraped oil collected by the oil gutter 81 is made to flow down into the oil pocket 27, and is pressurized in the pump chamber 139 having a narrow cross section in the rotation direction of the input shaft 19, and the output shaft is output. The oil was introduced radially inward of 37, and this oil was sent to each lubrication point by centrifugal force to perform sufficient lubrication.

Thus, unlike the conventional example in which forced lubrication is performed by an engine-driven oil pump, the structure is simple, the cost is low, and the fuel consumption of the engine is low because the oil pump and the oil passage for the oil pump are unnecessary. Since the oil can be guided to the inner side of the rotating output shaft 37 in the radial direction with almost no load, and the lubrication points can be sufficiently lubricated, the transfer 129 can prevent seizure and abnormal wear of the respective parts. , Durability is greatly improved.

Further, since the oil passage 93 is formed in the case 9 between the seal 25 and the bearing 23, a sufficient margin for press-fitting the bearing 23 into the case 9 can be secured over the entire circumference, and the bearing 23 is sealed on one side. Oil pocket 2 that can secure a large amount of static pressure oil by using bearings
7 can be formed. Further oil pocket 2
7 is arranged above gravity direction 7 and has an oil garter 81.
Since the oil passage 93 is formed along the direction of gravity from the flow-out port 87 toward the oil pocket 27, the oil collected in the oil garter 81 is always stored in the oil passage 93, so that the weight of the oil itself is reduced. It acts to promote the urging of the oil, and the oil can be efficiently introduced into the oil passage 107.

Next, referring to FIGS. 16 and 17, the fourth embodiment of the present invention will be described.
An embodiment will be described. FIG. 16 shows a transfer 143 (power transmission device of the fourth embodiment), and this embodiment has the features of claims 1, 5, and 6.

The description of the transfer 143 and FIG.
6 and 17, members having the same functions as those of the above-described respective embodiments are denoted by the same reference numerals, and duplicate description of these members having the same functions is omitted.

As shown in FIG. 16, the transfer case 9 has a ring 145 fixed inside the oil pocket 27. As shown in FIG. 17, the ring 145 has two protrusions at equal intervals. 147 is provided. The second oil passage 107 is provided in a cross shape.

Thus, the oil urging means 149 is constituted.

When the input shaft 19 rotates, the oil in the oil pocket 27 which rotates together with the input shaft 19 collides with the convex portion 147 of the ring 145 and changes its direction. The oil whose direction has been changed is pushed into the oil flow passage 107 when the oil flow passage 107 comes to a position facing the convex portion 147.

The pushed oil is sent from the bearing 39, washers 51, 53 to each gear of the center differential 3 by a centrifugal force to lubricate them, and further, from the oil passage 111 in the radial oil passage. Lubricate the needle bearings 49, 49, etc. via 113 and return to the oil sump.

As described above, in the transfer 143, the scraped oil collected by the oil gutter 81 is caused to flow down into the oil pocket 27, collide with the convex portion 147 of the ring 145, and be guided to the inner side in the radial direction of the output shaft 37. The oil was sent to each lubrication point by centrifugal force so that sufficient lubrication was performed.

Thus, unlike the conventional example in which forced lubrication is performed by an engine-driven oil pump, the structure is simple, the cost is low, and the fuel consumption of the engine is low because the oil pump and the oil passage for the oil pump are unnecessary. Since the oil can be guided to the inner side of the rotating output shaft 37 in the radial direction with almost no load, and the lubrication points can be sufficiently lubricated, the transfer 143 prevents seizure and abnormal wear of the respective parts. , Durability is greatly improved.

Further, since the oil passage 93 is formed in the case 9 between the seal 25 and the bearing 23, a sufficient margin for press-fitting the bearing 23 into the case 9 can be secured over the entire circumference, and the bearing 23 is sealed on one side. Oil pocket 2 that can secure a large amount of static pressure oil by using bearings
7 can be formed. Further oil pocket 2
7 is arranged above gravity direction 7 and has an oil garter 81.
Since the oil passage 93 is formed along the direction of gravity from the flow-out port 87 toward the oil pocket 27, the oil collected in the oil garter 81 is always stored in the oil passage 93, so that the weight of the oil itself is reduced. It acts to promote the urging of the oil, and the oil can be efficiently introduced into the oil passage 107.

[0079]

The power transmission device according to the present invention is an oil gear.
The scraped oil collected by the rotor is made to flow down into the oil pocket, and the oil is urged by the oil urging means utilizing the rotation of the second rotating member to be pushed inward in the radial direction of the third rotating member. It was configured to be guided to each lubrication point by force.

As described above, unlike the conventional example in which forced lubrication is performed by the engine-driven oil pump, the oil pump and the oil passage for the oil pump are unnecessary, the structure is simple and the cost is low, and the fuel consumption of the engine is improved. With little load, the oil can be guided to the inside of the rotating member in the radial direction to sufficiently lubricate each lubricated part, prevent seizure and abnormal wear of each part, and greatly improve durability.

A power transmission device according to a second aspect is the power transmission device according to the first aspect, wherein the oil urging means is a screw that rotates integrally with the second rotating member, and a fixing member that forms a gap between the screw and the screw. Side plate member so that the oil in the gap is urged toward the second oil flow path side by the rotation of the screw. Like the power transmission device of claim 1, the structure is simple. The cost is low, and the oil is guided to the inside of the rotating member in the radial direction to lubricate each lubricated part sufficiently, and the seizure and abnormal wear of each part are prevented, and the durability is improved. Can be greatly improved.

According to a third aspect of the present invention, there is provided the power transmission device according to the first aspect, wherein the pump chamber, which is gradually narrowed along the rotational direction, is arranged around the second rotary member. The oil urging means is constituted by a plate for pressurizing the oil in the rotating oil pocket and a second oil flow path into which the oil pressurized in the pump chamber flows. Similar to the device, it has a simple structure and low cost, with almost no burden on the fuel consumption of the engine,
Oil can be guided radially inward of the rotating member to sufficiently lubricate each lubricated portion, seizure and abnormal wear of each portion can be prevented, and durability can be greatly improved.

A power transmission device according to a fourth aspect is the power transmission device according to the first aspect, in which the oil in the oil pocket that rotates together with the rotating member is rotated by the pump chamber in which the cross section from the opening to the discharge portion gradually narrows. The oil urging means is constituted by the pressurizing plate fins and the second oil flow path into which the oil pressurized from the discharge portion of the pump chamber flows, and the same as the power transmission device according to claim 1. The structure is simple, the cost is low, and the fuel consumption of the engine is hardly burdened, and the oil is guided radially inward of the rotating member to sufficiently lubricate each lubrication point and prevent seizure and abnormal wear of each part. The durability can be greatly improved.

According to a fifth aspect of the present invention, there is provided the power transmission device according to the first aspect, wherein the oil in the oil pocket which rotates together with the rotating member collides with the convex portion to change its direction.
The oil urging means is constituted by a ring pushed into the second oil flow path, and like the power transmission device of claim 1, the structure is simple and the cost is low, and the fuel consumption of the engine is hardly burdened. The oil can be guided inward in the radial direction of the rotating member to sufficiently lubricate each lubricated portion, prevent seizure and abnormal wear of each portion, and greatly improve durability.

A power transmission device according to a sixth aspect is the power transmission device according to any one of the first to fifth aspects, in which the second rotating member is hollow and is coaxially arranged outside the third rotating member. In addition, even in the structure in which the third rotating member is arranged inside the hollow second rotating member and is difficult to lubricate, the oil is sent to the inner side in the radial direction of the third rotating member by the oil urging means, and each lubrication point is It can be sufficiently lubricated to prevent seizure and abnormal wear of each part and greatly improve durability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, which is a D-O2-O1-H cross-sectional view of FIG.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a partially cutaway view taken along arrow A in FIG.

FIG. 4 is a view on arrow B in FIG. 1;

FIG. 5 is a bottom view of the oil gutter used in each embodiment.

FIG. 6 is a side view of one side of the oil gutter of FIG.

FIG. 7 is a side view of the other side of the oil gutter of FIG.

8 is a cross-sectional view taken along the line CC of FIG.

FIG. 9 is a view on arrow D of FIG.

10 is a view on arrow E of FIG.

FIG. 11 is a cross-sectional view of essential parts showing a second embodiment of the present invention.

FIG. 12 is a sectional view taken along line FF of FIG. 11;

FIG. 13 is a main-portion cross-sectional view showing a third embodiment of the present invention.

14 is a cross-sectional view taken along line GG of FIG.

FIG. 15 is a front view of the plate fin used in the third embodiment.

FIG. 16 is a cross-sectional view of an essential part showing a fourth embodiment of the present invention.

17 is a cross-sectional view taken along line HH of FIG.

FIG. 18 is a sectional view of a conventional example.

[Explanation of symbols]

1, 119, 129, 143 Transfer (power transmission device) 9 Transfer case (casing) 19 Input shaft (second rotating member) 27 Oil pocket 37 Output shaft (third rotating member) 47, 55 Sprocket (first) 1 rotation member) 57 chain (first rotation member) 81 oil gutter 93 first oil flow path 97, 121 plate 101 double-thread screw (screw) 103 gap 105, 127, 141, 149 oil bias Means 107 Second oil flow path 125, 139 Pump chamber 131 Plate fin 135 Opening 137 Discharging part 145 Ring 147 Convex part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Fukatsu 2388 Omiyacho, Tochigi City, Tochigi Prefecture Tochigi Fuji Industrial Co., Ltd. (72) Inventor Kenichi Shigekura 2388 Omiyacho, Tochigi City, Tochigi Fuji Industrial Co., Ltd. Within

Claims (6)

[Claims] 1. A casing having an oil reservoir inside thereof, an oil grate for receiving oil scraped up from the oil reservoir by the rotation of the first rotating member, and a first oil flow-down device. An oil flow path, an oil pocket for collecting the oil flowing down from the oil flow path, an oil urging means for urging the oil collected in the oil pocket by the rotation of the second rotation member, and the second rotation member are provided. A power transmission device comprising: a second oil flow path that guides the biased oil radially inward of the third rotating member. 2. A screw rotating integrally with the second rotating member,
2. The power transmission device according to claim 1, wherein an oil urging means is constituted by a fixed plate which forms a gap between the screw and the screw, and the oil in the gap is pushed into the second oil passage by the rotation of the screw. . 3. A pre-pump having a pump chamber for pressurizing oil in an oil pocket that rotates together with the second rotating member, with a gap between the second rotating member and the second rotating member gradually narrowing along the rotating direction of the second rotating member. The power transmission device according to claim 1, wherein an oil urging means is constituted by a second oil flow path into which the oil pressurized in the pump chamber flows. 4. A pump that is formed so that a cross section from the opening to the discharge portion becomes gradually narrower, and oil in an oil pocket that rotates together with the second rotating member is introduced from the opening to pressurize in a cross section that becomes gradually narrower. 2. The power transmission device according to claim 1, wherein an oil urging means is constituted by a plate fin having a chamber and a second oil flow path into which pressurized oil flows from a discharge portion of the pump chamber. 5. A fixed-side ring for pushing the second oil flow passage and the oil in an oil pocket that rotates together with the second rotating member against the convex portion to change the direction and push the oil into the second oil flow passage. The power transmission device according to claim 1, wherein the oil urging means is constituted by 6. The power transmission device according to claim 1, wherein the second rotating member is hollow, and is coaxially arranged outside the third rotating member.