JP2003185001A - Lubricating device for transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating device for a transmission capable of stably feeding lubricating oil to a pilot bearing disposed between an input shaft and an output shaft irrespective of the operating state of the transmission. <P>SOLUTION: This lubricating device for the transmission comprises the pilot bearing 30 disposed between the shaft end part 11 of the input shaft 10 and the tubular end part 21 of the output shaft 20, a pair of tapered roller bearings 31 and 32 fitted between the output shaft and a housing 40 surrounding the output shaft to pivotally support the output shaft, and a separator 50 disposed between the tapered roller bearings. The lubricating oil is efficiently guided to an oil hole provided in the outer peripheral surface of the output shaft through one tapered roller bearing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission in which an input shaft and an output shaft are coaxially arranged, and both ends of the transmission are supported by pilot bearings. The present invention relates to a lubricating device for a transmission that can supply lubricating oil.

[0002]

2. Description of the Related Art Vehicles (passenger cars, buses, trucks, etc.) driven by an engine, a motor, etc., have an input shaft (input shaft) and an output shaft (output shaft) in order to obtain speed and driving force according to the driving situation. ) Is provided with a transmission capable of changing the reduction ratio. Such transmissions include automatic transmission (AT) and CV
Typical examples are T and manual transmission (MT). Depending on the type of the transmission, the layout of the vehicle has a layout in which the input shaft (input shaft) and the output shaft (output shaft) are arranged coaxially, and one end of the input shaft and one end of the output shaft are connected. May be mutually supported by pilot bearings.

[0003]

This pilot bearing is required to operate stably even if the relative rotational speed between the input shaft and the output shaft changes due to a shift or a change in usage. To be Then, how to lubricate the pilot bearing, that is, how to stably supply the lubricating oil becomes a problem. In particular, a PTO (Power Take Of) that extracts the driving force from the input shaft when the vehicle is stopped
f) In the case of a transmission used in a vehicle, even if the output shaft is in a stopped state, the input shaft rotates, so it is extremely difficult for the pilot bearings interposed therebetween to be properly lubricated under various conditions. Will be important to.

The present invention has been made in view of such circumstances. That is, it is an object of the present invention to provide a transmission lubrication device capable of appropriately supplying lubricating oil to a pilot bearing between an input shaft and an output shaft regardless of an operating condition or a vehicle use condition.

[0005]

Therefore, the present inventor has diligently studied to solve this problem, and as a result of repeated trial and error,
When the output shaft of the transmission is supported by a pair of pilot bearings, the idea of forming a lubricating oil supply path from one pilot bearing to the oil hole of the output shaft was conceived, and the present invention was completed. . That is, the lubricating device for a transmission of the present invention includes an input shaft having at least an axial end portion of which an end surface is closed and rotationally driven by a drive source, and a tubular end portion into which the axial end portion of the input shaft is inserted. An output shaft having an internal oil passage axially extending from the tubular end portion and an oil hole communicating with the internal oil passage and opened on the outer peripheral side and arranged coaxially with the input shaft. A pilot bearing fitted between the shaft end and the tubular end to allow relative rotation between the input shaft and the output shaft, a housing surrounding the output shaft, and the output shaft. Between a pair of tapered roller bearings fitted between the housing and supporting the output shaft, and between the pair of tapered roller bearings Is arranged, characterized by comprising the separator to form a feed path for guiding the lubricating oil to the oil hole through one of the tapered roller bearing. In the present invention, the separator arranged between the pair of tapered roller bearings functions as a weir for the lubricating oil. Therefore, the lubricating oil supplied between the pair of tapered roller bearings is mainly guided to the oil hole via one tapered roller bearing.
As a result, it is possible to guide the lubricating oil to the oil hole of the output shaft more reliably, and it is possible to sufficiently supply the lubricating oil from the internal oil passage to the pilot bearing. The tapered roller bearing is located on the outer peripheral side of the output shaft. Therefore, lubrication to the other tapered roller bearing on the opposite side of the separator (the side that is not the supply path) can be relatively easily performed by various methods, and there is no support even if the separator is provided.

By the way, it is more preferable that the separator forms an oil sump in the supply path by the pair of tapered roller bearings, the output shaft and the housing. The amount of lubricating oil supplied between the pair of tapered roller bearings varies depending on the operating condition of the transmission. Therefore, if an oil reservoir is formed in the supply path, the lubricating oil can be stably supplied to the oil hole despite such fluctuations. The larger the volume of this oil sump, the better. Therefore, it is advisable to dispose the separator close to the other tapered roller bearing side.

The lubricating oil supplied between the pair of tapered roller bearings or the oil reservoir may be forcibly supplied by an oil pump or the like, but the lubricating oil scattered in the casing of the transmission is recovered. But good. An oil gutter may be provided in order to efficiently collect the scattered lubricating oil and supply it to the oil sump or the like. That is, it is preferable that the transmission lubricating device further includes an oil gutter that collects the scattered lubricating oil and supplies the lubricating oil to the supply path. The oil gutter is preferably grooved, but may be of a size that allows lubricating oil to be transmitted (for example, a rib of a casing or a housing).

Further, in order to efficiently feed the lubricating oil thus introduced near the oil hole to the oil hole, an oil catcher may be provided. That is, the transmission lubricating device further includes an oil catcher that extends from the outer peripheral side of the output shaft and rotates integrally with the output shaft to guide the lubricating oil near the oil hole to the oil hole. Is preferable. There are various shapes of this oil catcher. For example, there are a claw (collection part) extending at a desired angle in the rotation direction, and a disc having a spiral groove or a protrusion. Further, the oil catcher may be integrated with the rotary shaft or may be a separate member fitted to the rotary shaft. It is convenient to use a separate member because it can be easily assembled and the degree of freedom in design can be increased. When the output shaft is stopped, the effect of inducing the lubricating oil by this oil catcher cannot be expected. However, as mentioned above,
Since the lubricating device for a transmission of the present invention has a structure in which the lubricating oil is sufficiently guided to the oil hole, there is no problem even when the output shaft is stopped. This is also the excellent effect of the present invention.

By the way, the "transmission" in the present invention is a manual transmission (M
T) or an automatic transmission (AT), and in the case of MT, it may be an input reduction type or an output reduction type. However, in the case of an output reduction type transmission used in a PTO vehicle or the like, the input shaft often rotates with the output shaft stopped. Even in that case, as described above, according to the lubricating device for a transmission of the present invention, the lubricating oil is sufficiently guided to the oil hole, and the lubricity of the pilot bearing is not impaired. Therefore, the transmission further includes a counter shaft that rotates integrally with a counter gear that meshes with an idling gear that is disposed on the axis of the input shaft,
It can be said that the present invention is particularly effective in the case of an output reduction type transmission in which a driving force is transmitted from the counter shaft to the output shaft via a reduction gear.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described more specifically with reference to embodiments. FIG. 1 shows a cross-sectional view of a lubricating device 1 which is an embodiment of the present invention. The transmission lubrication device 1 has a P
It is provided in a well-known output reduction type manual transmission 2 used in a vehicle with a TO. The manual transmission 2 includes an input shaft 10 that is rotationally driven from a drive source (engine) via a clutch, and an output shaft 20 that is coaxially arranged on the input shaft 10.
And a housing 40 surrounding them and a housing 4
The extension housing 90 is provided at the rear end of the output shaft 20 and supports the rear portion of the output shaft 20.

The input shaft 10 is provided with a free-wheel gear 12 which is provided according to the number of gears to achieve a desired reduction ratio, and a free-wheel gear 12 and the input shaft 10 which can be smoothly operated according to a speed change operation. A well-known synchromesh mechanism 70 for connecting and rotating integrally is provided. The output shaft 20 has a wide reduction gear 23.
Is formed on the outer peripheral side and the inner peripheral side is cylindrical.
1 is provided on the front end side. The solid shaft end 11 of the input shaft 10 is fitted in the shaft center of the tubular end 21 via a pilot bearing 30 made of a roller bearing. The output shaft 20 has a reduction gear 23.
Drive power is transmitted and input from the counter gear via the. Further, a cylindrical internal oil passage 24 having a bottom is bored rearward from the tubular end portion 21. An oil hole 23 is formed near the bottom of the internal oil passage 24 in an oblique direction from the outer peripheral surface of the output shaft 20 so as to communicate therewith.

The output shaft 20 is supported on the front side thereof by a pair of tapered roller bearings 31, 32 fitted between the output shaft 20 and the housing 40. The tapered roller bearings 31 and 32 are arranged to face each other with the small diameter side facing inward. Between the tapered roller bearings 31 and 32, there is interposed an annular member 33 used to stabilize the axial force of the nut 34 when attaching them. Furthermore, an annular oil seal 50
Are arranged near the tapered roller bearing 32 on the outer peripheral side of the annular member 33. This oil seal 5
0, housing 40 and output shaft 2
A cylindrical space formed between 0 and the tapered roller bearings 31, 32 is defined. Oil seal 50
The cylindrical space on the rear side, which is partitioned by, becomes the oil sump 43. The oil seal 50 corresponds to the separator in the present invention.

An oil catcher 80 is mounted on the outer peripheral side of the opening 23a of the oil hole 23. As shown in FIG. 2, the oil catcher 80 has an annular disc 81 on which a spirally protruding collecting portion 82 is formed. When the oil catcher 80 rotates in the rotation direction of FIG. 2 together with the output shaft 20, the lubricating oil around the oil catcher 80 is collected by the collecting portion 82 and guided to the central portion of the shaft (that is, to the oil hole 23). . Inside the housing 40, an oil gutter 60 having a U-shaped cross section with an open top is further provided.
, Are provided so as to descend from the front to the rear. The rear end side of the oil gutter 60 is connected to the inlet side of the oil passage 41 communicating with the oil sump 43.

Next, the supply path of the lubricating oil from the oil trough 60 to the pilot bearing 30 will be described. The lubricating oil scraped up by the idle gear 12 or the like is scattered in the oil gutter 6
0, and is supplied to the oil sump 43 through the oil passage 41. Due to the presence of the oil seal 50, the lubricating oil stored in the oil sump 43 is tapered roller bearing 31.
From the outer side of the oil catcher 80. here,
When the output shaft 20 is rotating, the tapered roller bearing 31 is pumped.
Therefore, the lubricating oil is tapered roller bearing 31.
The lubricating oil is more positively supplied from the smaller diameter side to the larger diameter side, that is, from the oil sump 43 to the oil catcher 80 side.
Moreover, when the output shaft 20 is rotating, the oil catcher 80 has a guiding effect to the oil hole 23, so that the lubricating oil is supplied more efficiently.

However, even when the output shaft 20 is stopped, since the input shaft 10 and the like are rotating, a sufficient amount of lubricating oil is recovered by the oil gutter 60, and the oil passage 41 and the oil sump 43 are collected. And the lubricating oil is introduced. Further, in the present embodiment, due to the existence of the oil seal 50, the lubricating oil supplied to the oil reservoir 43 hardly flows to the tapered roller bearing 32 side, but mainly to the tapered roller bearing 31 side. As a result, sufficient lubricating oil is supplied to the oil hole 23 without depending on the pumping action of the tapered roller bearing 31 and the guiding effect of the oil catcher 80.

Thus, regardless of the usage status of the transmission 1,
The lubricating oil sufficiently supplied from the oil hole 23 passes through the internal oil passage 24 extending in the axial direction of the output shaft 20,
It is guided to the inner center of the tubular end portion 21. Here, since the rear end surface of the shaft end portion 11 of the input shaft 10 is not open, the lubricating oil guided to the cylindrical end portion 21 is
Flows into the pilot bearing 11 on the outer peripheral side. In this way, it is possible to stably supply the lubricating oil to the pilot bearing 11.

[0017]

According to the lubricating device for a transmission of the present invention, the lubricating oil can be stably supplied to the pilot bearing interposed between the input shaft and the output shaft regardless of the operating state of the transmission.

[Brief description of drawings]

FIG. 1 is a sectional view according to an embodiment of the present invention.

FIG. 2 is a front view showing an oil catcher used in the embodiment.

[Explanation of symbols]

10 Input shaft 20 output shaft 21 Reduction gear 23 oil holes 24 internal oil passage 30 pilot bearing 31, 32 Tapered roller bearing 40 housing 43 oil sump 50 Oil seal (separator) 60 oil gutter 80 oil catcher

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16H 57/02 302 F16H 57/02 302B 302D F16N 7/20 F16N 7/20 F term (reference) 3J028 EA13 EB35 EB62 FA12 FA52 FB03 FC32 FC63 GA02 3J063 AA02 AB02 AC03 BA11 CA01 CB41 CB43 CB44 CB60 3J101 AA16 AA25 AA32 AA42 AA54 AA62 AA82 CA08 CA14 EA67 FA32 GA01

Claims (5)

[Claims] 1. An input shaft, which has at least a closed shaft end portion and is driven to rotate by a drive source, a tubular end portion into which the axial end portion of the input shaft is inserted, and a shaft from the tubular end portion. An output shaft that has an internal oil passage extending in the direction and an oil hole that communicates with the internal oil passage and that is open on the outer peripheral side and that is arranged coaxially with the input shaft; A pilot bearing fitted between the tubular end portion and allowing relative rotation between the input shaft and the output shaft, a housing surrounding the output shaft, and a housing fitted between the output shaft and the housing. And a pair of tapered roller bearings mounted to support the output shaft, and arranged between the pair of tapered roller bearings. Par de separator and the transmission lubricating apparatus characterized by comprising a which via a roller bearing to form a feed path for guiding the lubricating oil to the oil hole. 2. The lubricating device for a transmission according to claim 1, wherein the separator forms an oil sump in the supply path by the pair of tapered roller bearings, the output shaft, and the housing. 3. The lubricating system for a transmission according to claim 1, further comprising an oil gutter that collects the scattered lubricating oil and supplies it to the supply path. 4. The oil catcher according to claim 1, further comprising an oil catcher extending from the outer peripheral side of the output shaft and rotating integrally with the output shaft to guide the lubricating oil near the oil hole to the oil hole. Lubrication device for transmission. 5. The transmission further includes a counter shaft that rotates integrally with a counter gear that meshes with an idle gear arranged on the axis of the input shaft, and the counter shaft decelerates to the output shaft. The lubrication device for a transmission according to any one of claims 1 to 4, which is an output reduction type transmission in which a driving force is transmitted via a gear.