JPS587139Y2 - Hensokuki Bearing Nukedomesouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a transmission bearing retaining device that is mainly used in automobile transmissions and prevents a bearing fitted to a spline shaft from moving in the axial direction.

As shown in FIG. 1, a main shaft 1 having a spline 1a is generally installed in an automobile transmission, and normally this main shaft 1 has a front end, that is, an end near the clutch, and two rear ends. At the point, through bearings, bushings, etc.
It is held in the transmission case, and at an intermediate point,
It is held in a bearing housing 3 co-fabricated with the transmission case via a transmission bearing 2, and is supported by immovable parts at these three locations.

Further, on the main shaft 1, a gear 4 is provided before and after the bearing 20.
. A gear 5 is mounted in spline engagement with the main shaft 1 and operates in a fixed position.

This transmission bearing 2 is held on the main shaft 1 in order to prevent it from coming out from the housing 3. That is, the inner ring 2a of the bearing 2 is held down by the lock nut 7 through the gear 5 and washer 6. The bearing 2 is prevented from moving backward on the main shaft 1, and the front end surface of the inner ring 2a abuts a snap ring 8 fitted to the main shaft 1, thereby preventing the bearing 2 from moving forward.

For this purpose, the main shaft 1 is formed with a threaded portion 1b that meshes with the lock nut 1, and a spline cut-off annular groove 1c into which the snap ring 8 is inserted, as shown in FIG.

The present invention is directed to a method of configuring a means for preventing the forward movement of the bearing 2, such as the above-mentioned snap ring 8. However, in the conventional method using the above-mentioned snap ring 8, when the lock nut 7 is tightened, , the snap ring 8 opens and a bending moment is generated in the annular groove 1c of the main shaft 1, which has the disadvantage that the main shaft 1 is easily damaged.

As a conventional technique, in addition to the snap ring method described above, a method has been proposed in which a stopper plate 9 is used to hold down the bearing 2, as shown in FIG.

In this method, as shown in Fig. 4, a disc-shaped stopper plate 9 having an inner periphery forming a subline engagement tooth profile is inserted into the main shaft 1, and then lowered into the annular groove 1c and pushed down by one tooth. As shown in FIG.
A U-shaped lock pin 10 is inserted into an axial through hole formed inside to lock the rotation of the plate 90, thereby preventing the bearing 2 from moving forward.

According to this method, due to the play in the spline engagement of the gear 5, the inner surface of the plate 9 is subjected to repeated impacts in the rotational direction and wears out, and as a result, the tightening torque of the lock nut 7 is loosened, which is generated in the main shaft 1. The bending moment causes a problem that the plate 9 is damaged.

The present invention relates to an improvement in the structure of the snap ring 8. Specifically, the snap ring 8 is replaced with a completely annular stopper plate formed by splitting, and the stopper plate is replaced by another holder plate. The main purpose of this invention is to prevent the bearing from moving in the axial direction by holding it in place, and the purpose of the present invention is to provide a transmission bearing retaining device that has sufficient strength to withstand the tightening of the lock nut 7 and is highly durable. It's about doing.

Hereinafter, the present invention will be explained based on an illustrated embodiment.
Among the members constituting the embodiment, the same members as those used in the above-mentioned conventional configuration will be described with the same reference numerals added.

The main shaft 11 has a spline 11a formed on its outer periphery.
As shown in the figure, it is held in a bearing housing 3 via a bearing 2 at an intermediate portion.

On the main shaft 11, gears 4,
5 is fitted by spline engagement, and this bearing 2
is the lock nut 7 through the gear 5 and washer 6.
It is tightened and held against the main shaft 11 rearwardly so as not to come off.

Also, in contact with the front surface of the bearing 2, on the main shaft 11, there are
12.14 are overlapped and fitted.

That is, the stopper plate 12 located at the front is
As shown in FIGS. 7 and 8, it is a combination plate that is attached in a so-called split ring shape by two semicircular ring pieces 13, and the inner circumference of the ring piece 13 is connected to the spline of the main shaft 11. having a diameter that is cut off and circumscribed to the annular groove 11b;
Thereby, the stopper plate 12 is fitted into the annular groove 11b.

Furthermore, the holder plate 14 located at the rear is the ninth
As shown in the figure and FIG. 10, the plate 14 has an annular shape with a flange, that is, the inner periphery of the plate 14 is formed with a splice/retaining tooth profile, and the outer periphery end faces toward the stopper plate. A cylindrical collar portion 14a is formed by extending.

This holder plate 14 is an inner ring 2a of the bearing 2.
The inner circumferential wall of the flange portion 14a abuts on the outer circumferential edge of the stopper plate 12 to hold the plate 12 and prevent separation between the two ring pieces 13. .

Both plays) 12 and 14 are in contact with the main shaft 11 and the bearing 2 as described above, so when the bearing 2 tries to move forward on the main shaft 11, the inner ring 2a moves through the holder plate 14 to the stopper plate. 12 is pressed forward, and as a result, the inner peripheral front end surface of the stopper plate 12 abuts against the cut-off surface of the spline 11a, so that the bearing 2 is prevented from moving forward.

Note that the torsional load applied to the holder plate 14 when tightening the lock nut 7 is borne by the inner teeth of the plate 14, so this load is carried by the stopper plate 1.
Not as good as 2.

In the transmission bearing retaining device configured in this way,
Since the suppressing load is carried by the completely circular surface of the stopper plate 12, and the torsional load is carried by the entire circumference of the holder plate 14, the external force resistance of both plates 12 and 14 is increased, and the stopper plate 12 is securely locked to the main shaft 11 via the holder plate 14,
The plate 12 does not rattle, and phenomena such as cutting and wear that are observed in conventional structures do not occur.

As described above, according to the transmission bearing retaining device according to the present invention, since the retaining member is firmly assembled, both plates 12 and 14 exhibit sufficient strength to withstand the tightening of the lock nut and are subject to wear and tear. Since there are no parts, the durability of the device is improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an axial sectional view illustrating a conventionally configured retaining device, Fig. 2 is a front view of the snap ring shown in Fig. 1, and Fig. 5 is an axial sectional view illustrating a conventionally configured retaining device. Schematic diagram of main parts showing another example, No. 4
3 is a front view of the stopper plate shown in FIG. 3, FIG. 5 is a front view showing the contact relationship between the stopper plate and other members, and FIG. 6 is a transmission showing an embodiment of the present invention. 7 is a front view of the stopper plate shown in FIG. 6, FIG. 8 is a sectional side view taken along the line ■-■ in FIG. 7, and FIG. 9 is a cross-sectional view in the axial direction of the bearing retainer. The front view of the holder plate shown in Fig. 6, Fig. 10 is the front view of the holder plate shown in Fig. 9
It is a cross-sectional side view in X-rays. 2...Bearing, 11...Main shaft, 1
1a... Spline, 11b... Ring groove, 12... Stopper plate, 14...
...Holder plate, 14a...Brim part.

Claims (1)

[Scope of utility model registration request] In a transmission bearing retaining device that prevents the bearing from moving in one direction on the main shaft, a spline is fitted to the side of the main shaft where the bearing is fitted. In addition to providing an annular groove with a cut-off portion, a split-shaped annular stopper plate is fitted into the annular groove, and a spline engagement tooth profile is formed on the inner periphery and a cylindrical collar portion is provided. A transmission bearing slip-off prevention device comprising a holder plate which holds the outer edge of the stopper plate by the flange and is fitted onto the main shaft.