JPH11351359A - Thrust bearing support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the assembling work, to lower the cost, and to lower the weight of a product while reducing the number of bearing to be arranged as small as possible without performing the remarkable remodeling by arranging a snap ring in a shaft, and providing a thrust bearing adjacent to the snap ring so as to receive the thrust force with the thrust bearing through the snap ring. SOLUTION: A snap ring 13 to be held by a shaft s1 for fixation and for positioning a clutch hub 7a on the shaft s1 is arranged in a rear end surface of the clutch hub 7a. A thrust bearing 14 and a clutch drum 15 for receiving it are arranged adjacent to the snap ring 13. Inner diameter of the thrust bearing 14 is formed smaller than the outer diameter of the shaft s1 at a part for transmitting the thrust force to the snap ring 13. In a case where the thrust force at the time of driving is applied to the shaft s1 , the thrust is securely received by the thrust berating 14 through the snap ring 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention reduces the number of installed thrust bearings by improving the support structure of a thrust bearing which receives a force in the axial direction of a shaft, and simplifies the structure of a product incorporating the same. The aim is to reduce the weight. Hereinafter, a description will be given of an example of a transmission that transmits a power from an engine at a predetermined gear ratio by arranging a plurality of planetary gears including a sun gear, a pinion gear, a ring gear, and a planetary carrier.

[0002]

2. Description of the Related Art A conventional automatic transmission is disclosed in Japanese Unexamined Patent Publication No.
The one disclosed in Japanese Patent No. 2919 is known. In such a transmission, the rotation of the engine input from the torque converter via the input shaft is output from the output shaft via a transmission mechanism including three sets of planetary gears, so that a suitable output rotation can be obtained at the wheels. .

[0003]

However, in the conventional transmission as described above, since a thrust force of the planetary gear is received particularly during driving, it is necessary to arrange a large number of thrust bearings for positioning the planetary gear. Was.

[0004] However, since the bearings are arranged by using the ends and the steps of the constituent members, the parts where the ends and the steps can be provided are limited. The problem remains where the layout restrictions for bearing arrangement are large, which increases the number of parts, increases assembly time, increases the weight of the transmission itself, and can lead to higher product costs. There was sex.

An object of the present invention is to provide a structure in which the number of bearings can be reduced as much as possible without significant modification, thereby simplifying the assembling work, reducing the cost, and reducing the weight of the product itself. The present invention proposes a novel thrust bearing support structure that can achieve the above.

[0006]

According to a first aspect of the present invention, there is provided a support structure for a thrust bearing, wherein a thrust force is transmitted when power is transmitted by a gear.
A feature is that a snap ring is arranged on the shaft and a thrust bearing is installed adjacent to the snap ring so that the thrust force input to the shaft is received by the thrust bearing via the snap ring. Things.

Further, in the thrust bearing support structure according to the second aspect of the present invention, the inner diameter of the thrust bearing in the configuration defined in the first aspect is made larger than the outer diameter of the shaft of the portion transmitting the thrust force to the snap ring. The feature is that it is small.

According to a third aspect of the present invention, there is provided a support structure for a thrust bearing according to the first aspect, wherein the thrust bearing is provided adjacent to one end face of the snap ring so that the thrust is input to the shaft during driving. The force is received by the thrust bearing via the snap ring, and the thrust force input to the shaft during coasting is provided by installing the thrust force transmitting member and the thrust bearing adjacent to the other end face of the snap ring. It is characterized in that it is transmitted by a thrust bearing via a snap ring and a thrust force transmitting member.

Further, in the thrust bearing support structure according to a fourth aspect of the present invention, in the third aspect, the inner diameter of the thrust bearing is larger than the outer diameter of the shaft of the portion that transmits the thrust force at the time of driving to the nut ring. Is also small. Also, claim 5 of the present invention
The thrust bearing support structure according to claim 1 or 2, wherein the gears are a plurality of planetary gears including a sun gear, a pinion gear, a ring gear, and a planetary carrier, and constituting a power transmission mechanism of a transmission. It is characterized by points.

According to a thrust bearing support structure according to a sixth aspect of the present invention, the transmission includes a first planetary gear having a sun gear integrally formed with a shaft for outputting power, and a first planetary gear. Shaft having a second planetary gear having a second sun gear passing therethrough, a clutch hub splined to the shaft, and a sun gear of the second planetary gear having the clutch hub therein. A multi-plate clutch composed of a clutch drum connected via a connecting member is disposed adjacent to the second planetary gear, between the front end surface of the clutch hub and the connecting member, the end surface of the sun gear of the second planetary gear and the connecting member thereof. Carrier of the second planetary gear and the first planetary arranged adjacent thereto Mutual the A carrier and between first
A bearing is provided between the carrier disposed on the other side of the planetary gear and the end face of the shaft facing the carrier, and the snap is fixedly held on the shaft at the rear end face of the clutch hub to position the clutch hub on the shaft. It is characterized in that a ring is installed and a thrust bearing is arranged adjacent to the snap ring.

[0011]

In the thrust bearing support structure according to the first aspect of the present invention, a thrust ring is arranged on the shaft, and the thrust bearing is installed adjacent to the snap ring, so that the thrust input to the shaft is obtained. Since the force is received by the thrust bearing via the snap ring, there is no restriction on the position for installing the bearing, for example, a layout that receives the thrust force of the shaft applied at the time of driving only with this bearing And it is possible to easily reduce the number of bearings to be installed as a whole.

In the support structure for a thrust bearing according to a second aspect of the present invention, the inner diameter of the thrust bearing is determined by adjusting the inner diameter of the thrust bearing to the portion transmitting the thrust force to the snap ring (the end face of the step of the shaft and the components incorporated in the shaft). Because the outer diameter is smaller than the outer diameter, even if a large thrust force is applied to the bearing disposed adjacent to the snap ring, the upright posture of the snap ring will maintain the initial state, and the snap ring will fall off the shaft or fall down Never.

In the thrust bearing support structure according to claim 3 of the present invention, a single (one) snap ring can transmit the thrust force during driving and coasting, so that a simpler structure can be achieved. can do. In the support structure for a thrust bearing according to claim 4 of the present invention, the thrust force of the shaft is used as the thrust force at the time of driving. (Refers to the thrust force in the opposite direction), and the thrust force can be stably received at the time of driving with a particularly large load.

According to claim 5 of the present invention, the gear is a sun gear,
A plurality of planetary gears including a pinion gear, a ring gear, and a planetary carrier and constituting a power transmission mechanism of a transmission are used, but the structure is relatively complicated in a plurality of combinations of such gears. However, even if the number of installed bearings is reduced, the members can be positioned and the thrust force during driving can be reliably received.

[0015] In the invention according to claim 6, claim 5 is provided.
Is applied to a transmission in which a plurality of planetary gears as defined in (1) are arranged as a front planetary gear, a first planetary gear, and a second planetary gear, the clutch hub is fixedly held on a shaft at a rear end face of the clutch hub. A snap ring for listening to the position on the shaft is installed, and a thrust bearing is arranged adjacent to this snap ring. Therefore, in the transmission having such a configuration, a bearing installation location that needs to be installed is a front end face of the clutch hub. Between the first planetary gear and the carrier of the second planetary gear and between the carrier of the second planetary gear and the carrier of the first planetary gear disposed adjacent thereto. A carrier arranged between and on the other side of the first planetary gear; The mutual between the step end face of the input shaft facing the LES.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to the drawings. FIG. 1 shows an example in which the support structure for a thrust bearing according to the present invention is applied to an automatic transmission incorporating three sets of planetary gears.

In the drawing, 1 is a torque converter, 2 is an input shaft connected to the torque converter 1,
Reference numeral 3 denotes a front planetary gear, and reference numeral 4 denotes a first planetary gear installed close to the front planetary gear 3. The first planetary gear 4 is mounted around an output shaft 5 to transmit power. Sun gear 4 integrally formed with contributing shaft s ₁ (hollow shaft)
comprising a a, a pinion gear 4b, the ring gear 4c and one of the output shaft 5 and splined to the planetary carrier 4d _l, the 4d _r.

Reference numeral 6 denotes a second planetary gear installed close to the first planetary gear 4;
Planetary gear 6 comprises a sun gear 6a and the pinion gear 6b and the ring gear 6c and the planetary carrier 6d _l passing through the shaft s _1, the 6d _r.

Reference numeral 7 denotes a multi-plate clutch which controls connection and disconnection between the sun gear 4a of the first planetary gear 4 and the sun gear 6a of the second planetary gear 6, and the multi-plate clutch 7 comprises a shaft. The clutch hub 7a is spline-coupled to s ₁ and a clutch drum 7b which contains the clutch hub 7a and is connected to a sun gear 6a of the second planetary gear 6 via a connecting member 8.

Reference numeral 9 denotes a clutch hub of the multi-plate clutch 7.
A slide disposed between the front end face of the connecting member 7 and the connecting member 8
The bearing 10 is the sun of the second planetary gear 6.
Gear 6a and carrier 6d_lThrust placed between
Bearing, 11 is carrier 6d_lAnd the first planetary
Gear 4 carrier 4d_rThrust bed arranged between
Alling, 12 is arranged on the opposite side of the first planetary gear 4.
Carrier 4d to be placed _rAnd the input system facing it
Thrust bearing arranged between end faces of shaft 2
It is.

Further, 13 is arranged a snap ring for positioning on the shaft s ₁ of the clutch hub 7a is fixed and held at the shaft s ₁ in the rear end surface of the clutch hub 7a, 14 adjacent to the snap ring 13 Thrust bearing, 15 is thrust bearing 14
Receiving the clutch drum.

FIG. 2 is an enlarged view of a main part of the first planetary gear 4 and the second planetary gear 6 shown in FIG. Although in this example illustrates a case of arranging the snap ring 13 only one, placing the thrust bearing 14 adjacent to the snap ring 13, the support, when drives toward the right side in the drawing the shaft s ₁ When a thrust force is applied, the thrust bearing 14 can reliably receive the thrust force through the snap ring 13.
Furthermore, transmission in the case where the thrust force at the time coasting towards the left in the drawing the shaft s ₁ is applied, the clutch hub 7a functions as a thrust force transmission member, the snap ring 13, the thrust force on the thrust bearing 10 through the clutch hub 7a can do.

FIGS. 3 and 4 show examples of the arrangement of conventional bearings when applied to the transmission as shown in FIG. 1 above. In such a configuration, when assembling the components of the transmission, the bearing is disposed by using the portion where the step portion is formed, and the thrust force is received, and the number of bearings inevitably increases, and this example Then the thrust force at the time of driving is
In addition to 6, it will be received by bearings 17 and 18.
(Thrust force is transmitted from bearing 16 to bearing 17 to bearing 18). The thrust force during the coast is received by the bearings 19 → 20.

In the present invention, the thrust bearing 14 is disposed between the snap ring 13 and the support 15, as shown in FIGS. Therefore, it is possible to adopt a structure having almost no layout restrictions. In this case, the main bearing for receiving the thrust force at the time of driving is the thrust bearing 14, which is different from the conventional one shown in FIG. In comparison, at least two bearings can be installed. Regarding the thrust force generated during coasting, bearings 9, 10, 11,
12 (9 → 10 → 11 → 12
). When the clutch hub 7a is installed adjacent to the snap ring 13 as in the present invention, the clutch hub 7a
By using a as a thrust force transmitting member, one snap ring 13 has both functions of transmitting the thrust force at the time of driving and the thrust force at the time of coasting, and has the advantage of a simpler configuration.

In the present invention, the second planetary gear 6
While the positioning of the carrier 6d _l doing bearings 10 and 11, which is adapted to be be subjected to thrust force generated at the time of coasting. On the other hand, in the conventional structure, in particular, the carrier of the second planetary gear is provided with the bearing 21 only for the positioning thereof, but the present invention has an advantage that such a bearing can be omitted.

FIG. 5 is an enlarged view of a main part of a thrust bearing support structure according to the present invention. Since the thrust force generated during driving is greater than the thrust force generated during coasting, the snap ring 1
When a thrust force is applied to the snap ring 13 through the thrust bearing 3, the same force is applied to the snap ring 13, so that the snap ring 13 itself may fall down.
Is smaller than the outer diameter φB of the portion transmitting the thrust force. That is, it is important that φB> φA.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example in which a support structure for a thrust bearing according to the present invention is applied to an automatic transmission.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a view showing a conventional bearing support structure. ,

FIG. 4 is an example showing a conventional bearing support structure for an automatic transmission.

FIG. 5 is an enlarged view showing a main part of a support structure of a thrust bearing according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque converter 2 Input shaft 3 Front planetary gear 4 First planetary gear 5 Output shaft 6 Second planetary gear 7 Multi-plate clutch 8 Connecting member 9 Thrust bearing 10 Thrust bearing 11 Thrust bearing 12 Thrust bearing 13 Stap ring 14 Thrust Bearing 15 Support 16 Thrust bearing 17 Thrust bearing 18 Thrust bearing 19 Thrust bearing 20 Thrust bearing 21 Thrust bearing

Claims (6)

[Claims] In a shaft to which a thrust force is transmitted when power is transmitted by a gear, a snap ring is disposed on the shaft, and a thrust bearing is installed adjacent to the snap ring to reduce a thrust force input to the shaft. A thrust bearing support structure characterized in that it is received by a thrust bearing via a snap ring. 2. The thrust bearing support structure according to claim 1, wherein the inner diameter of the thrust bearing is smaller than the outer diameter of the shaft at a portion transmitting the thrust force to the snap ring. 3. A thrust bearing is provided adjacent to one end face of the snap ring so that a thrust force input to the shaft during driving is received by the thrust bearing via the snap ring. By installing a thrust force transmitting member and a thrust bearing adjacent to the other end face of the thrust force input to the shaft during coasting,
The support structure for a thrust bearing according to claim 1, wherein the transmission is performed by a thrust bearing via a snap ring and a thrust force transmission member. 4. The support structure for a thrust bearing according to claim 3, wherein an inner diameter of the thrust bearing is smaller than an outer diameter of a shaft for transmitting thrust force during driving to the snap ring. 5. A gear set including a sun gear, a pinion gear, a ring gear, and a planetary carrier, and a plurality of sets of planetary gears constituting a power transmission mechanism of a transmission.
A support structure for a thrust bearing according to claim 1. 6. The transmission has a first planetary gear having a sun gear integrally formed on a shaft contributing to transmission of power, and a second planetary gear having a sun gear through which the shaft of the first planetary gear passes. A multi-plate clutch comprising a clutch hub spline-coupled to a shaft, and a clutch drum having the clutch hub mounted therein and connected to a sun gear of a second planetary gear via a connecting member. A second planetary gear, adjacent to the second planetary gear, between the front end face of the clutch hub and the connecting member, between the end face of the sun gear of the second planetary gear and the carrier opposite the connecting member, the second planetary gear. Between the carrier of the first planetary gear and the carrier of the first planetary gear disposed adjacent thereto, and the other of the first planetary gear. Bearings are provided between the carrier arranged on the side and the end face of the input shaft facing the carrier, and a snap ring is fixedly held on the shaft at the rear end face of the clutch hub and performs positioning of the clutch hub on the shaft. 6. The support structure for a thrust bearing according to claim 5, wherein a thrust bearing is disposed adjacent to the snap ring.