JP3505814B2 - Transmission forced lubrication system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a transmission, and more particularly to a forced lubricating device for a transmission used in a gear transmission having a synchronizing device used in a vehicle.

[0002]

2. Description of the Related Art A conventional forced lubrication device for a transmission used in a vehicle or the like is to lubricate a bearing, such as a needle bearing, which is arranged between a shaft and a gear, which relatively rotate in a transmission case, with lubricating oil. It is a system for forcibly supplying. For example, as shown in FIG. 3 , the forced lubrication device of the transmission is mounted on a wall surface of a transmission case 4 accommodating a transmission 4, a clutch housing 42 accommodating a clutch device, and a transmission case 4 on the clutch housing 42 side. Oil filter 1 provided in the front cover 1 and the transmission case 4 and for filtering the oil accumulated in the lower part thereof
2, and an oil pump 14 for circulating the oil filtered by the oil filter 12. The forced lubrication device of the transmission is an oil sump portion formed by an inter-housing (see reference numeral 43 in FIG. 4) installed inside the front cover 1 for the oil pumped up from the transmission case 4 by the oil pump 14. That is, the oil is supplied to the oil sump portion 8, is supplied from the oil hole of the top gear shaft 2 to the shaft center oil hole 5 of the main shaft 3 through the nozzle 11, and then the oil is supplied from the axial oil hole 5 to the bearing through the branch oil hole 6. Then, it is forcibly lubricated. In addition, the oil pumped up by the oil pump 14 includes the circulation pipe 15, the vehicle-side oil filter 16, the oil cooler 17, and the circulation pipe 1.
The oil is supplied to the oil sump 8 through 8.

As a conventional forced lubrication device for a transmission, for example, one disclosed in Japanese Utility Model Laid-Open No. 3-51266 as shown in FIG. 4 is known. In FIG. 4, parts having the same functions as those shown in FIG. 3 are designated by the same reference numerals. The forced lubrication device of the transmission includes a top gear shaft 2 rotatably supported by a transmission case 4 to which a front cover 1 is attached via a rolling bearing 7, and a main shaft rotatably supported by a top gear shaft 2. 3, a clutch hub spline-fitted to the main shaft 3, gears rotatably arranged on the main shaft 3 via bearings, synchronous devices that operate the main shaft 3 and the gears in a torque transmitting state, a main The shaft 3 has an axial oil hole 5 penetrating in the axial direction, and a branch oil hole 6 communicating the axial oil hole 5 with each of the bearings. The oil sump portion 8 is formed between the inter housing 43 and the front cover 1. The top gear shaft 2 has a radial oil hole 9 formed perpendicularly to the axis and an axial oil hole 10 extending in the axis direction. Further, the axial oil hole 10 of the top gear shaft 2 and the axial oil hole 5 extending in the axial direction of the main shaft 3 are connected by a nozzle 11.
The above-mentioned forced lubrication device of the transmission includes a clutch housing 42
And the front cover 1 are integrally formed, and only the portion surrounding the top gear shaft 2 is formed separately.

Conventionally, an oil pump in a lubrication device of a transmission has its inner rotor or drive gear coaxially attached to the tip of a counter shaft that is gear-transmitted with a main shaft. A main shaft is rotatably attached to a top gear shaft rotatably supported by a front cover via rolling bearings. The oil sump part provided on a side surface of the rolling bearing includes a front cover, a front oil seal disposed between the front cover and top gear shaft is formed from 及 beauty inter housing. A transmission lubrication device that supplies lubricating oil to a bearing arranged on a main shaft is lubricated through an axial oil hole formed in the main shaft, and the axial oil hole is formed on a side surface of the rolling bearing. The oil sump provided and the top gear shaft are communicated with each other through an oblique oil hole formed so as not to interfere with the rolling bearing (see, for example, Japanese Utility Model Publication No. 3-51262 and Japanese Utility Model Publication No. 3-51263). ).

[0005]

However, in the forced lubrication device for a transmission as shown in FIG. 4, the oil sump portion 8 is formed by using the inter-housing 43, and the oil sump portion 8 is sealed by the inter-housing 43. And the radial oil hole 9 are communicated with each other, and the oil supplied to the oil sump portion 8 passes through the radial oil hole 9, the axial oil hole 10 and the nozzle 11 and the oil hole 5
To supply. Therefore, a space for arranging the inter-housing 43 for forming the oil sump portion 8 is required, and moreover, from the end surface of the oil sump portion 8, in other words, from the end surface of the transmission case 4, the top gear shaft 2
The dimension up to the nozzle 11 arranged in the concave portion 19 of the No. 3 becomes long, the number of component parts increases, and the radial oil hole 9 and the axial oil hole 10 formed in the top gear shaft 2 form a right-angled passage. The total length becomes long and the pressure loss becomes large.

Further, in the transmission lubricating device disclosed in the above-mentioned publication, the oil hole obliquely formed in the top gear shaft overcomes the centrifugal force generated by the rotation of the top gear shaft to supply a sufficient amount of oil. Therefore, when the internal pressure of the oil sump portion of the front cover is increased, since the seal ring for protecting the front oil seal is not installed, the durability of the front oil seal with respect to the hydraulic pressure decreases. is there.

An object of the present invention is to solve the above-mentioned problems, and an inner race of a rolling bearing is formed in order to form an oil sump portion between a front cover and a transmission case having a rolling bearing. A groove that forms a part of the oil hole is formed in the inner surface of the oil hole so as not to adversely affect the strength and life of the inner race, and a seal ring is placed on the oil sump side before the front oil seal. The oil hole formed in the top gear shaft is tilted to reduce the number of parts, and the overall length of the oil hole is shortened to reduce the pressure loss, so that the oil from the oil sump to the axial oil hole in the main shaft is lubricated. An object of the present invention is to provide a forced lubrication device for a transmission in which oil is positively and smoothly supplied to improve lubrication efficiency and increase hydraulic pressure in an oil sump.

[0008]

Means for Solving the Problems] The present invention, top gear shaft is rotatably supported via the rolling bearing to the transmission case fitted with a front cover, one end is fitted in the recess of the top gear shaft rotatably supported by and main shaft Te, gears rotatably disposed through the bearings to the main shaft, the axial oil hole extending to the main shaft in the axial direction, the with the axial oil bore each Branch oil hole communicating with the bearing, and side surface of the rolling bearing
Oil reservoir formed on the front cover portion corresponding to
In a forced lubrication device for a transmission having a ball-shaped portion, an oil groove is formed by obliquely cutting the inner end of the inner race of the rolling bearing, and the oil groove and the axial oil hole are communicated with each other at the shortest distance. formed on the top gear shaft inclined oil hole
The front cover and the top gear shaft
Between the seal ring and the seal on the oil sump side.
The present invention relates to a forced lubrication device for a transmission, characterized in that an oil seal is arranged separately from the ring .

Furthermore, forced lubrication equipment of the transmission, shall have <br/> is arranged hermetically sealed plate to the end surface between said inner race and outer race of the rolling bearing of the oil reservoir side Is .

Further, the forced lubrication system for the transmission, through the front <br/> Symbol oil from said reservoir through said seal ring front oil seal side to leaked oil is formed in the top gear shaft oil relief passage It is discharged to the outer peripheral side of the main shaft.

[0011] Forced lubrication device for a transmission according to the present invention, the above manner, the that consists, overall length of the oil hole from the oil sump to said axial oil hole is formed in the shortest distance, the oil Pressure loss can be reduced. Moreover, since the oil sump is formed by the front cover, the rolling bearing, the hermetically sealing plate of the rolling bearing, and the seal ring arranged between the front cover and the top gear shaft, the axial direction is reduced. The size can be shortened, and even if the oil pressure in the oil reservoir is increased due to the forced lubrication for each bearing, the oil pressure is not directly applied to the front oil seal, and the durability and reliability of the front oil seal can be improved. . Further, since the oil sump portion is formed, it is not necessary to use a conventional inter housing or the like, the structure can be simplified, and the number of parts can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a forced lubrication device for a transmission according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a forced lubrication device for a transmission according to the present invention, and FIG. 2 is a sectional view showing a half taken along line AA of FIG. 1 and 2, the same parts as those shown in FIGS. 3 and 4 are designated by the same reference numerals.

This forced lubrication device for a transmission is applied to a gear type transmission. Gear type transmissions, for example,
As shown in FIGS. 1 and 2, a transmission case 4 attached to a front cover 1 with bolts 37, an input shaft or top gear shaft 2 rotatably supported by the transmission case 4 via rolling bearings 7, The output shaft, that is, the main shaft 3, whose one end is fitted into the recess 19 of the top gear shaft 2 and is rotatably supported,
A counter shaft or sub-shaft (not shown) arranged parallel to the main shaft 3, a clutch hub 28 spline-fitted to the main shaft 3, a main shaft 3
The gears 33 and 36, which are rotatably disposed on the bearing hub 38 such as a needle bearing, and the clutch hub 2.
8 through the main shaft 3 and each gear 32, 33, 36
And the respective gears 34 and 35 rotatably arranged on the sub shaft via bearings such as needle bearings.

The rolling bearing 7 includes an inner race 22, an outer race 23 and a large number of rolling elements 2 arranged therebetween.
It is composed of 1. The synchronizing device is composed of a synchronizing gear 30 having dog teeth attached to the gears 32 and 33, a synchronizing link 31, and a sleeve 29 that slides by spline-fitting to a clutch hub 28. Further, between the front cover 1 and the top gear shaft 2, a metal seal ring 26 located on the oil sump 8 side and a front oil seal 40 made of an elastic material are incorporated. Further, a felt ring 39 is provided on the outer peripheral surface of the seal ring 26.
Is inserted to improve the sealing property of the seal ring 26. Since the operation of the gear type transmission is the same as that of the conventional one, its description is omitted here.

In the gear type transmission, the forced lubrication device of the transmission is such that the main shaft 3 has an axial oil hole 5 extending in the axial direction, an oil sump 27 in the recess 19 of the top gear shaft 2 and the main shaft 3. It has a nozzle 11 communicating with the axial oil hole 5 and a branch oil hole 6 communicating with the axial oil hole 5 and each bearing 38. In particular, the oil sump portion 8 corresponds to the side surface of the rolling bearing 7. The front cover 1 is formed by a seal ring 26 and a hermetic seal plate 25,
A plurality of oil grooves 24 are formed by obliquely cutting the inner end of the inner race 22 of the rolling bearing 7, and the inclined oil hole 20 that connects the oil groove 24 and the axial oil hole 5 at the shortest distance is formed with a top gear shaft. It is characterized in that it is formed in 2.

The hermetically sealing plate 25 includes the inner race 22 and the outer race 2 of the rolling bearing 7 adjacent to the oil sump 8.
It is arranged between 3 and 3. The seal ring 26 is arranged on the oil sump portion 8 side between the front cover 1 and the top gear shaft 2, and also the front oil seal 40.
Are arranged between the front cover 1 and the top gear shaft 2 with being separated from each other by the seal ring 26. Further, the oil leaked from the oil sump portion 8 to the front oil seal 40 side through the seal ring 26 is discharged to the outer peripheral side of the main shaft 3 through an oil pressure release hole formed in the top gear shaft 2, that is, an oil escape passage 41. The oil, that is, the lubricating oil, lubricates the lubrication area of the transmission unit and is discharged.

Since the forced lubrication device for the transmission is constructed as described above, the conventional forced lubrication device for the transmission has the oil sump portion 8 formed in the front cover 1 by using the inter-housing 43. Compared with the above, the axial length L of the top gear shaft 2 and the front cover 1 can be made shorter. Further, since the plurality of oil grooves 24 are formed in the inner race 22 of the rolling bearing 7 and the oil grooves 24 are communicated straight with the inclined oil holes 20 formed in the top gear shaft 2, the number of parts can be reduced and The length of the oil hole 20 can be shortened as a whole, and the pressure loss caused by the oil supply can be reduced. Moreover, since the oil sump 8 and the axial oil hole 5 are communicated with each other by the inclined oil hole 20, the centrifugal force acting on the lubricating oil can be reduced, and the lubricating oil is not difficult to be supplied. Further, the plurality of oil grooves 24 formed in the inner race 22 of the rolling bearing 7 may be formed so as not to reduce the durability, that is, the life of the inner race 22.

Furthermore, forced lubrication system for this transmission, the oil reservoir portion 8 is constituted by a seal ring 26 and the hermetic seal plate 25 between the front cover 1 and the rolling bearing 7,
Since the seal ring 26 is arranged in front of the front oil seal 40, the oil pressure in the oil sump portion 8 is not directly applied to the front oil seal 40, so that the oil pressure in the oil sump portion 8 is smoothly achieved in order to smoothly perform forced lubrication. Can be increased. Further, even if the oil pressure in the oil sump portion 8 increases and oil leaks from the oil sump portion 8 to the front oil seal 40 side through the seal ring 26, the oil escape passage 41 is formed in the top gear shaft 2. Therefore, the leaked oil is sent to the lubrication portion of the transmission through the oil escape passage 41, lubricates the lubrication portion, and is then discharged to the oil sump.

[0019]

Effects of the Invention Forced lubrication device for a transmission according to the present invention, which is configured as described above, it is possible to form in front SL front cover and to reduce the axial dimension of the top gear shaft structure, said top can shorten the overall length of the oil hole formed in the gear shaft, it is possible to reduce the pressure loss for the supply of lubricating oil, the axial oil bore and the branch oil hole of the main shaft through the inclined oil hole by increasing the pressure of the lubricating oil It is possible to smoothly and reliably supply sufficient lubricating oil to improve the lubrication efficiency. Therefore, the forced lubrication device of the transmission can sufficiently cope with the high output of the engine, the high rotation of the engine, the increase of the synchronizing capacity, and the downsizing of the transmission due to the reduction of the length dimension.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a forced lubrication device for a transmission according to the present invention.

FIG. 2 is a cross-sectional view showing a half taken along line AA in FIG.

FIG. 3 is a schematic explanatory view showing a conventional forced lubrication device for a transmission.

FIG. 4 is a cross-sectional view showing a main part of a conventional forced lubrication device for a transmission.

[Explanation of symbols]

1 Front Cover 2 Top Gear Shaft 3 Main Shaft 4 Transmission Case 5 Axial Oil Hole 6 Branch Oil Hole 7 Rolling Bearings 8, 27 Oil Sump 11 Nozzle 19 Recess 20 Inclined Oil Hole 22 Inner Race 23 Outer Race 24 Oil Groove 25 Seal Seal plate 26 Seal ring 28 Clutch hub 33, 36 Gear 38 Bearing 40 Front oil seal (oil seal)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-101749 (JP, A) Actual opening Sho 61-103665 (JP, U) Actual opening Flat 5-90024 (JP, U) Actual opening 3- 51262 (JP, U) Actual flat 3-51263 (JP, U) Actual flat 4-49257 (JP, U) Actual flat 3-55919 (JP, U) Actual flat 3-17325 (JP, U) Fukui Sho 60-147821 (JP, U) Fumiaki 3-51266 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 57/00-57/12

Claims (3)

(57) [Claims] 1. A top gear shaft rotatably supported via a rolling bearing in a transmission case having a front cover attached, and one end of which is rotatably supported by fitting into a recess of the top gear shaft. Main shaft,
Gears rotatably disposed through the bearings to the main shaft, the axial oil hole extending in the axial direction to the main shaft, branched oil hole for communicating the with the axial oil bore each bearing, and the The front corresponding to the side of the rolling bearing
In a forced lubrication device for a transmission having an oil sump formed in a cover portion, an oil groove is formed by obliquely cutting an inner end of the inner race of the rolling bearing, and the oil groove and the axial oil are formed. inclined oil hole communicating the hole in the shortest distance is formed in the top gear shaft, said top gear Shah and the front cover
And a seal ring on the oil sump side between the shaft and
The oil seal is placed separately from the seal ring.
Forced lubrication apparatus for a transmission, characterized in that that. 2. A forced lubrication device for a transmission according to claim 1, wherein a hermetic sealing plate is arranged between the inner race and the outer race of the rolling bearing adjacent to the oil sump portion. . Wherein the oil leaked into the oil seal side through the seal ring before Symbol oil reservoir section, characterized in that it is discharged through the oil release passage formed in the top gear shaft to the outer periphery of the main shaft The forced lubrication device for a transmission according to claim 1 or 2 .