KR20090020119A - 6-speed power train with automatic transmission - Google Patents

Abstract

The present invention is to minimize the gap between the sun gear and the input shaft by mounting a support ring between the sun gear and the input shaft of the double pinion planetary gear set to significantly reduce the noise generated in the planetary gear set during the first stage driving in the vehicle state Provides a six-speed power train of automatic transmission.

Description

6-speed power train with automatic transmission {A 6TH-SPEED POWER TRAIN OF AN AUTOMATIC TRANSMISSION}

The present invention relates to an automatic transmission, and more particularly, to a six-speed power train of an automatic transmission to reduce the noise generated in the double pinion planetary gear set during the first stage driving in a vehicle state.

In general, a multi-speed shift mechanism of an automatic transmission is implemented by combining a plurality of planetary gear sets, and a power train in which the plurality of planetary gear sets is combined receives torque from a torque converter included in the automatic transmission. It shifts and transfers it to the output shaft.

Each of the planetary gear sets includes a sun gear, a planet carrier and a ring gear as its operating elements, and the planet carrier is connected to a pinion gear which is gear-coupled to the ring gear and the sun gear.

Recently, a six-speed power train of an automatic transmission has been developed to realize a sixth forward speed and one reverse speed, and the six-speed power train is an example, as shown in FIG. The first single pinion planetary gear set 3, the second single pinion planetary gear set 5, and the double pinion planetary gear set 7 are sequentially connected from the front on the input shaft 1 connected to the engine output side through the s). It is arranged as

That is, the six-speed power train of the automatic transmission consists of a combination of two single pinion planetary gearsets 3 and 5 and one double pinion planetary gearset 7, and the first single pinion planetary gearset 3 is It is arrange | positioned at the engine side, and the 2nd single pinion planetary gear set 5 and the double pinion planetary gear set 7 are arrange | positioned at the rear side of the said 1st single pinion planetary gear set 3 in order.

However, in the combination of the first and second single-pinion planetary gearsets 3 and 5 and the double-pinion planetary gearset 7 of the six-speed power train of the automatic transmission according to the prior art, the double-pinion planetary gearset 7 A gap is formed between the sun gear 8 and the input shaft 1 of) as shown in the "B" part of the drawing due to its coupling structure, and when the gap is increased, the support state of the sun gear 8 with respect to the input shaft 1 is increased. When the first stage driving in the vehicle state becomes weak, severe noise occurs in the double pinion planetary gear set 7. This noise acts as a factor causing discomfort to the driver.

Therefore, the present invention was created to solve the above problems, and by minimizing the gap between the sun gear and the input shaft of the double pinion planetary gear set, the noise generated in the double pinion planetary gear set during the first stage driving in the vehicle state can be significantly reduced. Its purpose is to provide a six-speed power train of an automatic transmission.

A six-speed power train of an automatic transmission according to an exemplary embodiment of the present invention for achieving the above object is a first single pinion planetary gear set, second single pinion from the front side on the input shaft connected to the engine output side via a torque converter. The planetary gear set and the double pinion planetary gear set are arranged, and a support ring is mounted between the sun gear of the double pinion planetary gear set and the input shaft.

The six-speed power train of the automatic transmission is preferably configured such that the support ring is forcibly fitted into the sun gear and the input shaft is inserted into the support ring.

According to the exemplary embodiment of the present invention as described above, as the support ring is mounted between the third pin of the double pinion planetary gear set and the input shaft, the gap between the sun gear and the input shaft is minimized to double the first stage in the vehicle state. There is an effect that can significantly reduce the noise generated in the pinion planetary gear set.

Hereinafter, the preferred configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a six-speed power train of the automatic transmission according to an exemplary embodiment of the present invention, Figure 3 is a cross-sectional view showing a double pinion planetary gearset of Figure 2, Figure 4 It is a cross-sectional block diagram which expands the "A" part of FIG.

Referring to the drawings, the six-speed power train of the automatic transmission according to the embodiment of the present invention is basically a first single-pinion planetary gear from the front side on the input shaft 1 connected to the engine output side via a torque converter (not shown). The set 10, the second single pinion planetary gear set 20, and the double pinion planetary gear set 30 are sequentially arranged.

The first single pinion planetary gear set 10 includes a first sun gear 11, a first planetary gear 12, and a first ring gear 13.

The second single pinion planetary gear set 20 is provided at the rear of the first single pinion planetary gear set 10, and the second sun gear 21, the second planetary gear 22, and the second ring gear 23 are provided. It is configured as.

In addition, the double pinion planetary gear set 30 is provided at the rear of the second single pinion planetary gear set 20, and the third sun gear 31, two sets of the third planetary gear 32 and the third ring gear 33 ).

That is, in the arrangement of the planetary gear sets 10, 20, 30, the first single pinion planetary gear set 10 is disposed at the front side of the transmission, and the double pinion planetary gear set 30 is disposed at the rear side of the transmission. And a second single pinion planetary gear set 20 is disposed therebetween.

Here, the double pinion planetary gear set 30 is variably connected to the input shaft 1 through the clutch 40, the third sun gear 31 is integrally connected to the clutch 40 by welding.

In the six-speed power train of the automatic transmission as described above, in this embodiment, a support ring 50 is provided between the third sun gear 31 of the double pinion planetary gear set 30 and the input shaft 1. .

The support ring 50 is press-installed between the third sun gear 31 and the input shaft 1 to minimize the gap between the third sun gear 31 and the input shaft 1 and at the same time as the third sun gear as the input shaft 1. Supporting the (31) serves to reduce the noise generated in the double pinion planetary gear set 30 during the first stage driving in the vehicle state.

This support ring 50 is a state in which the inner diameter surface of the third sun gear 31 portion (see “B” portion of FIG. 1) which is integrally connected by welding with the clutch 40 mentioned above is internally machined (FIG. 2). In the " A " and Fig. 4), it is press fitly fixed to the inner surface of the machined third sun gear 31.

In this case, the support ring 50 maintains a support structure with the input shaft 1 by inserting the input shaft 1 into the inner diameter while the inner diameter surface of the support ring 50 is processed.

Therefore, in this embodiment, since the support ring 50 is mounted between the third pin 31 and the input shaft 1 of the double pinion planetary gear set 30, the third sun gear 31 by the support ring 50. And the gap between the input shaft 1 and the input shaft 1 to minimize the noise generated by the double pinion planetary gear set 30 during the first stage driving in a vehicle state by supporting the third sun gear 31 as the input shaft 1. Will be.

That is, in the present embodiment, as shown in the graphs of FIGS. 5A and 5B, the support ring 50 is mounted between the third pin 31 and the input shaft 1 of the double pinion planetary gear set 30 as described above. As can be seen that the noise value (dashed line in the drawing) at 1200 rpm or more during the first stage driving in the vehicle state is significantly reduced compared to the comparative example (solid line in the drawing) according to the prior art.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is a cross-sectional view showing a six-speed power train of the automatic transmission according to the prior art.

2 is a cross-sectional view illustrating a six-speed power train of an automatic transmission according to an exemplary embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating the double pinion planetary gearset of FIG. 2. FIG.

4 is an enlarged cross-sectional view illustrating a portion “A” of FIG. 2.

5A and 5B are graphs showing noise values of a six-speed power train of an automatic transmission according to an exemplary embodiment of the present invention in comparison with a comparative example.

Claims (3)

In a six-speed power train of an automatic transmission in which a first single pinion planetary gear set, a second single pinion planetary gear set and a double pinion planetary gear set are arranged from the front side on an input shaft connected to an engine output side via a torque converter, And a support ring mounted between the sun gear of the double pinion planetary gear set and the input shaft. According to claim 1, And the support ring is forcibly fitted into the sun gear, and the input shaft is inserted into the support ring to configure the six-speed power train of the automatic transmission. The method of claim 2, When the inner diameter surface of the sun gear which is integrally connected to the clutch of the double pinion planetary gear set is processed, the support ring is inserted and fixed by interference fit, and the input shaft is fixed while the inner diameter surface of the support ring is processed. 6 speed power train of the automatic transmission, characterized in that inserted.

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