JPH0220526Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is applicable to transmission bearing devices,
More specifically, the present invention relates to a bearing device for lubricating a pilot bearing that supports a main shaft within a drive shaft.

[Conventional technology and problems]

A typical support structure for a drive shaft and a main shaft in an automobile transmission is shown in FIG. 5, in which a housing 1 rotatably supports a drive shaft 2 via a support bearing 3. A main shaft 6 is supported through a pilot bearing 5 in a support hole 4 provided on the end surface, and the pilot bearing 5 is inserted between an inner ring 5a fitted onto the main shaft 6 and an outer ring 5b integrally formed on the end of the drive shaft 2. Rolling elements 5c such as tapered rollers, cylindrical rollers, needles, etc.
A primary gear 7 is provided on the outer peripheral surface of the drive shaft 2 located inside the housing 1 .

By the way, in the bearing device for the drive shaft and main shaft as described above, it is necessary to supply lubricating oil to each of the support bearing 3 and the pilot bearing 5. must be refueled.

Since one end surface of the former support bearing 3 is exposed inside the housing 1, oil scraped up inside the housing 1 easily flows into the inside, so there is no particular problem.

On the other hand, the latter pilot bearing 5
is housed inside the drive shaft 2, and the ring plate 8 and gears are arranged close to the outer end that opens into the housing 1, so the amount of opening into the housing 1 is small, and the opening from the open end surface is small. Lubrication cannot be expected, and therefore, it is necessary to add a means to positively lubricate the pilot bearing 5 from the inner end side.

A conventional means for actively lubricating the pilot bearing 5 is as shown in FIG.
By providing an oil hole 9 that communicates with the inside of the support hole 4 in the tooth bottom portion of the primary gear 7, and forcing oil adhering to the gear into the oil hole 9 through the meshing portion of the gear,
It was designed to be supplied into the pilot bearing 5 through the support hole 4.

However, with the above-mentioned oil supply means, the oil adhering to the primary gear is scattered by centrifugal force during rotation. The amount of oil pumped into the oil passage hole 9 is extremely small, and there is a problem in that, depending on the conditions of use, sufficient oil cannot be supplied to the pilot bearing.

In addition, as an oil supply means different from that shown in the drawings, an annular chamber formed between the support bearing and its cover is communicated with the inside of the housing through an oil hole provided in the housing, and a hole is provided in the drive shaft that communicates the annular chamber with the support hole. A structure has also been proposed in which an oil passage is provided and the oil that enters through the oil passage is guided to the pilot bearing through the annular chamber and the oil passage, but in this case as well, there is no function to forcibly feed the oil, so the pilot bearing There is insufficient refueling.

This idea was made in order to solve the problems mentioned above, and the purpose was to forcibly feed the oil flowing from inside the housing to the pilot bearing, thereby ensuring that the pilot bearing was reliably lubricated. The purpose is to provide a bearing device for a transmission that can.

[Means for solving problems]

In order to solve the above problems, this invention incorporates a back plate inside the annular chamber, and creates a space between the inner surface of the annular chamber and the opposing surface of this back plate.
An oil flow gap is formed that communicates with the oil inlet passage and whose inner circumferential side faces the opening end of the oil supply passage, and the oil supply passage sucks oil in the annular chamber using centrifugal force caused by rotation of the drive shaft and sends it to the inner end side. This structure is formed by an inclined groove recessed in the outer peripheral surface of the drive shaft and a radial oil passage hole extending from the inner end of the inclined groove to the inside of the support hole.

[Effect]

The oil scraped up inside the housing flows into the annular chamber from the oil inlet passage and flows inward toward the drive shaft along the back plate. Some of the oil flows to the support bearing, but most of it flows to the drive shaft. The oil flows to the pilot bearing through the oil supply passage and support hole.

The inclined groove forming the oil supply passage produces a suction effect due to the rotation of the drive shaft, and the centrifugal force generated in the oil forcibly sends the oil toward the inner end, so that forced oil supply to the pilot bearing can be performed.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings. In addition, in FIG. 1, the same parts as in FIG. 5 are given the same reference numerals, and the description thereof will be replaced by the same ones.

In FIG. 1, the housing 1 and the cover 11 of the support bearing 3 are connected to an annular chamber 12 that opens into the housing 1 at the upper position of the support bearing 3 and is formed between the cover 11 and the support bearing 3. An oil inflow path 13 for communication is provided.

The ring-shaped back plate 14 built into the annular chamber 12 has an outer peripheral portion fixed to the cover 11 or the outer ring of the support bearing 3, and has gaps 12a and 12a between the inner surface of the cover 11 and the support bearing 3, respectively.
12b, and the aforementioned oil inlet passage 13 communicates with the annular chamber 12 with an oil flow gap 12a formed between the cover 11 and the back plate 14.

The inner periphery of the back plate 14 is located inside the inner ring 3a of the support bearing 3 with a distance maintained between it and the outer periphery of the drive shaft 2, and an oil guide piece 14 protruding toward the main shaft 6 is located on the inner periphery.
A is provided.

The part of the drive shaft 2 into which the support bearing 3 fits is formed in a large diameter part 15, and the inner ring 3a of the support bearing 3 protrudes slightly beyond the shoulder of this large diameter part 15, and is connected to the control oil guiding piece 14a. This prevents oil from flowing directly to the support bearing 3.

An annular chamber 1 is provided in the large diameter portion 15 of the drive shaft 2.
2 and the support hole 4, and the annular chamber 1 is opened by rotation.
An oil supply path 16 is provided for sucking oil in the pilot bearing 2 and supplying it to the pilot bearing 5.

This oil supply passage 16 is connected to the annular chamber 1 at the shoulder of the large diameter portion 15.
2, and a radial oil passage hole 18 extending from the inner end of the inclined groove 17 to the inside of the support hole 4.

A first example of the inclined groove 17 shown in FIGS. 1 to 3 extends along the axial direction of the drive shaft 2,
The bottom surface is sloped 17 so that it becomes shallower toward the inner end.
It is formed as a.

In this way, the bottom surface of the inclined groove 17 is changed to the inclined surface 17a.
Then, the oil adhering to the inclined surface 17a tries to maintain a balance between the centrifugal force generated during rotation and the adhesion force to the inclined surface 17a, and when the centrifugal force becomes larger than the adhesion force, the oil adheres to the inclined surface 17a toward the side with a larger rotation radius. I will have to move.

Therefore, the oil flowing into the annular chamber 12 is forcibly sent to the pilot bearing 5 by the suction action of the inclined groove 17 generated by the rotation of the drive shaft 2, and the bearing 5 is sufficiently lubricated. You will get it.

Next, another example of the inclined groove 17 shown in FIG. Formed at an angle,
Oil is forcibly sucked toward the inner end by the inclined side surface 17b located at the rear in the rotational direction.

The number of oil supply passages 16 provided is not limited in any case, and in order to improve the movement of oil toward the pilot bearing 5 within the support hole 4, as shown in FIG. The inner peripheral surface is a tapered surface 4a with a larger diameter on the pilot bearing 5 side.
Alternatively, the oil may be fed by centrifugal force.

The bearing device of this invention has the above-mentioned configuration, and the oil in the housing 1 that has entered the oil inflow path 13 is guided by the back plate 14 and directed toward the shoulder portion of the large diameter portion 15 into which the support bearing 3 is press-fitted. A part of the oil flows to the support bearing 3, and most of the remaining oil flows into the inclined groove 17.

Since the centrifugal force caused by the rotation of the drive shaft 2 causes a suction action on the inclined groove 17, the oil flows through the oil passage hole 18.
As a result, the pilot bearing 5 located within the support hole 4 can be sufficiently lubricated.

〔effect〕

As described above, according to this invention, the oil that has flowed into the annular chamber from the oil inlet passage by being guided by the back plate is sucked into the inclined groove of the oil supply passage provided in the drive shaft to supply oil to the pilot bearing. This allows a sufficient amount of lubricating oil to be supplied to the pilot bearing in the transmission.
The durability of pilot bearings can be greatly improved.

In addition, a back plate is incorporated into the annular chamber, and between the inner surface of the annular chamber and the opposing surface of this back plate,
Since an oil flow gap is formed which communicates with the oil inflow path and whose inner circumferential side faces the opening end of the oil supply path, the oil flowing into the annular chamber from the oil inflow path can be guided to the oil supply path through the gap. The pilot bearing can be reliably supplied with oil from the oil supply path.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the bearing device according to this invention.
Figure 2 is a plan view of the oil supply passage in the same manner as above;
4 is a plan view showing another example of the oil supply passage portion, and FIG. 5 is a longitudinal sectional view showing a conventional bearing device. 1 is a housing, 2 is a drive shaft, 3 is a support bearing, 4 is a support hole, 5 is a pilot bearing, 6 is a main shaft, 11 is a cover,
12 is an annular chamber, 13 is an oil inlet passage, 14 is a back plate, 16 is an oil supply passage, 17 is an inclined groove, 17a is an inclined surface, 17b is an inclined side surface, and 18 is an oil passage hole.

Claims (1)

[Claims for Utility Model Registration] (1) A main shaft is supported via a pilot bearing in a support hole of a drive shaft rotatably supported by a housing via a support bearing, and between the support bearing and its cover. A transmission that forms an annular chamber, has an oil inflow path in the housing and the cover that communicates between the inside of the housing and the annular chamber, and provides an oil supply path in the drive shaft that communicates the inner peripheral side of the annular chamber with the inside of the support hole. In the bearing device, a back plate is incorporated inside the annular chamber, and an oil flow gap is formed between the inner surface of the annular chamber and the opposing surface of the back plate, the oil flow gap communicating with the oil inlet passage and the inner peripheral side facing the open end of the oil supply passage. The oil supply passage includes an inclined groove recessed in the outer circumferential surface of the drive shaft so as to suck oil in the annular chamber by centrifugal force caused by rotation of the drive shaft and send it to the inner end side, and an inner end of the inclined groove. A bearing device for a transmission, characterized in that it is formed with a radial oil passage hole reaching the inside of the support hole. (2) An inclined groove for the oil supply passage is provided in the large diameter part of the drive shaft into which the pilot bearing is externally fitted, and this oil supply passage extends along the axial direction of the large diameter part and gradually becomes shallower toward the inner end. The transmission bearing device according to claim 1, wherein the bottom surface is formed as an inclined surface. (3) The inclined groove of the oil supply passage is provided in the large diameter part of the drive shaft into which the pilot bearing is fitted, and this oil supply passage is provided so as to be inclined linearly in the circumferential direction with respect to the axis of the large diameter part. A bearing device for a transmission according to claim 1 of the registered utility model.