JP2591873Y2 - Pinion shaft fixing structure of planetary gear device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a pinion shaft to a carrier using a fixing pin in a planetary gear device.

[0002]

2. Description of the Related Art Conventionally, as a pinion shaft fixing structure of a planetary gear device, for example, Japanese Utility Model Laid-Open Publication No.
The one described in Japanese Patent Application Laid-Open Publication No. H10-260, 1993 is known.

In the above-mentioned conventional publication, as shown in FIG.
The pinion shaft 06 is inserted into the support holes 02 and 03 formed in the annular portions 01a and 01b of the carrier 01, and the pinion 04 is rotatably supported by the pinion shaft 06 via the needle bearing 05. An annular portion 01b of the carrier 01 is provided for axially and rotationally fixing the carrier 01.
A pinhole shaft 06 and a carrier-side pin hole 07 and a shaft-side pin hole 08 are formed coaxially with each other, and a fixing pin 09 is press-fitted into these pin holes 07 and 08. Further, thrust washers 010 and 011 are provided between both ends of the pinion 04 and the annular portions 01a and 01b.

[0004]

However, in the above-mentioned conventional technique, when the pinion shaft 06 is fixed to the carrier 01, the fixing pin 09 is fixed to both the carrier-side pin hole 07 and the shaft-side pin hole 08. , The annular portion 0 of the carrier 01
In a part of the sliding surface of 1b with the thrust washer 011, the fixing pin 09 was pushed from the inside and the surface was raised. Therefore, carrier 01
When the thrust washer 011 receives the load in the thrust direction of the pinion 04 via the thrust washer 011, the annular portion 01b has a local contact, and the thrust washer 011 is worn to reduce the durability of the thrust washer 011. There was a problem.

The present invention has been made in view of the above-mentioned problem. In fixing the pinion shaft, the swelling of the sliding surface with the thrust washer capable of receiving the load in the thrust direction of the pinion is prevented. The purpose is to improve the durability of the thrust washer by preventing it.

[0006]

According to the present invention, in order to achieve the above object, a fixing pin is press-fitted into a pinhole on a shaft side of a pinion shaft, while an inner periphery of the pinhole is inserted into a pinhole on a carrier side of a carrier. The structure is such that there is a gap between them and they are loosely fitted.

[0007]

When the pinion shaft is fixed to the carrier, the end of the pinion shaft is inserted into the support hole of the carrier. At this time, the positions of the shaft side pin hole and the carrier side pin hole are adjusted, and then both pin holes are rotated. Through the fixing pin. At this time, the fixing pin is press-fitted into the shaft-side pin hole, but the carrier-side pin hole is loosely fitted with a gap between the pin and the inner periphery thereof. Therefore,
There is no swelling caused by press-fitting the fixing pin on the surface of the carrier pinion that receives the load in the thrust direction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a cross-sectional view illustrating an automatic transmission AT having a planetary gear device to which the pinion shaft fixing structure according to the embodiment of the present invention is applied. The automatic transmission AT receives a driving force from an engine. Torque converter TC and planetary gear set 1 provided outside input shaft IN
And a plurality of fastening elements for connecting and disconnecting the rotating elements of the planetary gear device 1 to each other and for fixing and releasing the fixing to the case 2.

As the fastening element, a high clutch H /
C, a low and reverse brake L & R / B, a low clutch L / C, a reverse clutch R / C, a band brake B / B, and a low one-way clutch L / OWC. As shown in the element operation diagram, except for the mechanically operated low one-way clutch L / OWC, it operates at each shift position by control pressure from a hydraulic controller (not shown).

The planetary gear set 1 has two sets of gears, a front planetary gear set 1F and a rear planetary gear set 1R. The front planetary gear set 1F includes a front sun gear SF, a front pinion PF, and a front ring gear RF. The rear planetary gear set 1R is composed of a rear sun gear SR and a rear pinion PR. The front pinion PF meshes with the front sun gear SF and the front ring gear RF and is supported by the carrier 3, and the rear pinion PR is formed as a long pinion type meshed with the rear sun gear SR and the front pinion PF. It is supported by.

Therefore, the planetary gear device 1 is configured as shown in FIG.
By the operation of each fastening element as shown in FIG. 5, power transmission as shown in each of FIGS. 5 to 9 is performed, and a gear ratio as shown in each of FIGS. 5 shows the first speed, FIG. 6 shows the second speed, FIG. 7 shows the third speed, FIG. 8 shows the fourth speed, and FIG. 9 shows the reverse speed.

FIG. 1 is a sectional view showing a main part of a carrier 3 for illustrating a fixing structure according to an embodiment of the present invention. It has annular portions 3a, 3b, and further, these annular portions 3a, 3b.
Support holes 3c and 3d are formed facing 3b. The pinion shaft 4 is supported by inserting both ends into the support holes 3c and 3d.

A front pinion PF is rotatably supported on the pinion shaft 4 via a needle bearing 5, and a spacer 6 is provided by bringing the front pinion PF into contact with an end surface thereof. Thrust washers 7a, 7 serving as stoppers for the needle bearing 5 and receiving a load in the thrust direction of the front pinion PF between the end faces of the pinion PF and the spacer 6 and the annular portions 3a, 3b.
b, 7c are provided.

As shown in FIG. 2, the annular portion 3a and the pinion shaft 4 have an oil groove 8a for guiding lubricating oil to the needle bearing 5 and first to fourth oil holes 8b. To 8e. That is, the oil groove 8a is formed on the inner periphery of the annular portion 3c,
The first oil hole 8b is a hole formed in the radial direction from the outer periphery of the annular portion 3a toward the oil groove 8a.
The oil hole 8c is constituted by a hole penetrating in the radial direction at the end of the pinion shaft 4 so as to be connectable to the first oil hole 8b, and the third oil hole 8d is connected at one end to the second oil hole 8c. And a fourth oil hole 8e is formed from the outer periphery of the pinion shaft 4 at the position where the needle bearing 5 is provided at the third oil hole 8d. And is formed by a hole drilled in the radial direction toward. The first oil hole 8b has a slightly larger diameter than the second oil hole 8c.

A fixing pin 9 for fixing the pinion shaft 4 to the carrier 3 is inserted by utilizing a portion formed when the first oil hole 8b and the second oil hole 8c are formed. That is, the hole formed outside the support hole 3c for forming the first oil hole 8b is inserted into the carrier-side pin hole 3c.
On the other hand, a portion of the hole formed for forming the second oil hole 8c on the carrier-side pin hole 3e side is defined as a shaft-side pin hole 4a, and both holes 3e are formed from the outer periphery of the annular portion 3a of the carrier 3. , 4a, the pinion shaft 4 is fixed to the carrier 3 in the axial direction and the rotation direction by inserting a fixing pin 9 therethrough.

The fixed pin 9 is formed to have the same diameter over the entire length, and its diameter r _P is smaller than the diameter r _S of the shaft side pin hole 4a and the diameter r _C of the carrier side pin hole 3e by r.
_S <are dimensioned to be r _P <r _C. Therefore, when the fixing pin 9 is inserted into the pin holes 3e and 4a, the fixing pin 9 is press-fitted into the shaft side pin hole 4a, while the outer periphery of the fixing pin 9 and the carrier side pin hole are inserted into the carrier side pin hole 3e. It is in a loosely fitted state having an interval with the inner periphery of 3e. The pinion shaft 4 that supports the rear pinion PR is also fixed by the same fixing structure, and illustration and description are omitted.

As described above, the planetary gear device 1 of the present embodiment
In order to fix the pinion shaft 4 to the carrier 3 in order to insert the fixing pin 9 into both the pin holes 3e and 4a, only the shaft side pin hole 4a was pressed and the carrier pin was loosely fitted into the carrier side pin hole 3e. The end face of the annular portion 3 a of the carrier 3 on the front pinion PF side is not raised by the fixing pin 9. Therefore, when the carrier 3 receives a load in the thrust direction through the thrust washers 7b and 7c, the carrier 3 does not hit the local part, and the wear of the thrust washer 7c can be prevented to improve the durability.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to the embodiment, and any change or addition without departing from the scope of the invention is included in the invention. For example, in the embodiment,
The fixing pin 9 has the same diameter over the entire length, and the carrier-side pin hole 3e and the shaft-side pin hole 4a have a diameter difference. However, when both pin holes have the same diameter,
As shown in FIG. 10, a stepped fixing pin 29 having a small diameter portion 29a and a large diameter portion 29b is used, or
As shown in FIG. 11, the large-diameter portion is press-fitted only into the shaft-side pin hole, and the small-diameter portion is loosely fitted into the carrier-side pin hole by using a tapered fixing pin 39 whose diameter gradually changes. You may make it do.

[0019]

As described above, in the present invention, the fixing pin is press-fitted into the pinhole on the shaft side of the pinion shaft, and the inner periphery of the pinhole is inserted into the pinhole on the carrier side of the carrier. The structure is such that there is a gap between them, so that there is no swelling caused by press-fitting the fixing pin to the sliding surface of the carrier with the thrust washer, so that the carrier can reduce the thrust load of the pinion in the thrust direction. When the thrust washer is received, it does not hit the thrust washer locally, so that the effect of preventing wear of the thrust washer and improving durability can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a pinion shaft fixing structure of a planetary gear device according to an embodiment of the present invention.

FIG. 2 is a perspective sectional view showing a main part of the structure of the embodiment.

FIG. 3 is a sectional view showing an automatic transmission to which the structure of the embodiment is applied.

FIG. 4 is an operation diagram of a fastening element of the automatic transmission.

FIG. 5 is a power transmission diagram (a) and a nomographic diagram (b) of the automatic transmission at the first speed.

FIG. 6 is a power transmission diagram (a) and a nomographic diagram (b) of the automatic transmission at the second speed.

FIG. 7A is a power transmission diagram of the automatic transmission at the third speed, and FIG.

FIG. 8 is a power transmission diagram (a) and a nomographic diagram (b) of the automatic transmission at the fourth speed.

FIG. 9 is a power transmission diagram (a) and a collinear diagram (b) when the automatic transmission is retracted.

FIG. 10 is a perspective view showing a fixing pin according to another embodiment of the present invention.

FIG. 11 is a perspective view showing a fixing pin according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view illustrating a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Planetary gear device 3 Carrier 3c Support hole 3d Support hole 3e Carrier side pin hole 4 Pinion shaft 4a Shaft side pin hole 7b Thrust washer 7c Thrust washer 9 Fixing pin 29 Fixing pin 39 Fixing pin PF Front pinion

Claims (1)

(57) [Scope of request for utility model registration] 1. A pinion shaft rotatably supporting a pinion is supported by inserting an end into a support hole formed in a carrier, and a thrust washer is provided between an end surface of the pinion and the carrier. A shaft-side pin hole is formed radially in a portion where the shaft is inserted into the support hole, and a carrier-side pin hole is formed in the carrier coaxially with the shaft-side pin hole. In a pinion shaft fixing structure of a planetary gear device in which the fixing pin is fixed to a carrier in an axial direction and a rotation direction, the fixing pin is press-fitted into a shaft-side pin hole, while an inner periphery of the carrier-side pin hole is fixed. A pinion shaft fixing structure for a planetary gear device, wherein the pinion shaft is loosely fitted with a gap between the pinion shaft and the pinion shaft.