JPH0612862U - Transfer device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a transfer device having a planetary gear mechanism, in which the thrust bearing of the carrier can be downsized, and the sound vibration performance of the main shaft is improved. Is intended to provide. [Structure] The one end of the main shaft on the planetary gear mechanism side is supported in the radial direction via two radial bearings, and the thrust force of the sun gear of the planetary gear mechanism is directly received by a ball bearing supporting the sun gear. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transfer device having a planetary gear mechanism.

[0002]

[Prior art]

 FIG. 3 shows an example of a planetary gear type speed change mechanism having a low speed stage of sun gear input, fixed ring gear, carrier output and a high speed stage of sun gear input / output. In FIG. 3, reference numeral 1 denotes a main shaft, and the main shaft 1 is rotatably supported by a radial bear ring 2 and one end (not shown) by a radial bearing (not shown). Reference numeral 3 denotes a sun gear, which is formed integrally with the input shaft 4 and is supported by a radial bearing 5. The thrust force of the sun gear 3 is received by the pair of thrust bearings 6a and 6b. A tubular portion 8 is formed at one end of the carrier 7, and the carrier 7 is supported by the case 10 by a ball bearing 9. That is, the main shaft 1 is supported at one end on the planetary gear mechanism side shown in FIG. 3 by the three radial bearings 2, 5 and 9.

[0003]

[Problems to be solved by the device]

 However, in such a conventional planetary gear type speed change mechanism, since the thrust of the sun gear is received by the thrust bearing, it is necessary to make the size in consideration of bearing life and strength. However, there was a problem that the thrust bearing became larger.

Further, since the main shaft is supported via three radial bearings, there is a problem in that the core deviates due to aging due to a supporting structure, it is difficult to secure rotational runout accuracy, and sound vibration performance deteriorates. It was The present invention has been made in view of such conventional problems, and it is possible to reduce a thrust bearing of a carrier and to improve a sound vibration performance of a main shaft. It is intended to be provided.

[0005]

[Means for Solving the Problems]

 The invention of claim 1 is a transfer device that has a planetary gear mechanism that switches between a low speed stage and a high speed stage, and transmits the rotational force of the planetary gear mechanism to the front wheels and the rear wheels. The main shaft supported in the radial direction is supported via two radial bearings, and the thrust force of the sun gear of the planetary gear mechanism is received by the ball bearing supporting the sun gear.

According to a third aspect of the present invention, in a transfer device having a planetary gear mechanism that switches between a low speed stage and a high speed stage and transmitting the rotational force of the planetary gear mechanism to front wheels and rear wheels, a sun gear of the planetary gear mechanism is provided. A needle bearing is provided between the outer race of the ball bearing that supports the case and the carrier of the planetary gear mechanism.

[0007]

[Action]

 According to the first aspect of the invention, the thrust force of the sun gear directly acts on the ball bearing, and the thrust force of the carrier is eliminated. Therefore, the needle bearing used for supporting the carrier in the thrust direction can be downsized.

Further, since one end of the main shaft on the planetary gear mechanism side can be supported by the two radial bearings, the rotational runout accuracy of the main shaft can be improved, and as a result, the sound vibration performance can be improved. Can be improved. In the invention of claim 3, the needle bearing provided between the outer race of the ball bearing and the carrier and the needle bearing for radially supporting the carrier are coaxially arranged one above the other, so that the total length of the transfer device is shortened. be able to. As a result, the size and weight of the device can be reduced.

Further, since the diameter of the needle bearing that receives the thrust force of the carrier can be increased, the support rigidity of the carrier in the thrust direction can be improved, and the durability of the planetary gear mechanism can be improved. . Further, since the thrust force of the carrier is transmitted from the outer race of the ball bearing to the casing, the thrust force does not enter the balls of the ball bearing, so that the durability of the ball bearing can be improved.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 11 is a sun gear that constitutes a part of the planetary gear mechanism 12, and the sun gear 11 is integrally rotatably provided on the input shaft 13. A plurality of planetary gears 14 mesh with the sun gear 11 and the planetary gears 14 are rotatably supported by a carrier 15. Reference numeral 16 is a ring gear that meshes with the planetary gear 14, and the ring gear 16 is fixed to the casing 17 by spline fitting.

Reference numeral 18 denotes a switching mechanism that switches the planetary gear mechanism 12 to a low speed stage or a high speed stage. The switching mechanism 18 meshes with the hub 20 spline-coupled to the main shaft 19 and the hub 20. A sleeve 21 that meshes with the carrier 15 and meshes with the sun gear 11 at a high speed stage, and a fork 22 that moves the sleeve 21.

Reference numeral 23 is a sprocket rotatably provided on the main shaft 19 via a bearing 24, and a chain 25 is installed on the sprocket 23. A sleeve 28 meshes with the hub 26 of the sprocket 23 and the hub 27 splined to the main shaft 19, and the sleeve 28 is moved by a fork 29. The movement of the sleeve 28 switches between four-wheel drive and two-wheel drive.

The main shaft 19 is rotatably supported by two radial bearings, that is, one end by a radial need bearing 30 and the other end by a radial ball bearing 31, and the sun gear 11 is supported by the casing 17 via a ball bearing 32. . The step portion 11A of the sun gear 11 contacts the ball bearing 32, and the ball bearing 32 receives the thrust force of the sun gear 11. The carrier 15 is supported on the sun gear 11 in the radial direction via a needle bearing 33. Two needle bearings 34 and 35 are provided between the carrier 15 and the sun gear 11 and between the carrier 15 and the ball bearing 32. The needle bearings 34 and 35 do not receive the thrust of the sun gear 11, but support the carrier 15 in the thrust direction.

As described above, since the thrust force of the sun gear 11 is directly received by the ball bearing 32, the thrust force of the carrier 15 in the thrust direction is eliminated. Therefore, the thrust force of the sun gear 11 does not act on the needle bearings 34 and 35, and the size can be reduced. Further, unlike the conventional case, the carrier 15 is not supported by the ball bearing 32 but is supported by the sun gear 11 and the ball bearing 32. Therefore, one end of the main shaft 19 on the planetary gear mechanism side is supported by the two radial bearings 30, 32. Can be supported.

As a result, the rotational runout accuracy of the main shaft 19 can be improved, and the sound vibration performance can be improved. Next, FIG. 2 is a view showing another embodiment of the present invention. In the above embodiment, the needle bearing 34 that receives the thrust force of the carrier 15 is provided between the carrier 15 and the inner race of the ball bearing 32. Therefore, the needle bearing 34 and the radial needle that radially supports the carrier 15 are provided. Since the bearings 33 are arranged side by side in the axial direction, the size of the entire transfer device becomes long, and as a result, the device becomes large and the weight also increases.

In this embodiment, the total length of the transfer device is shortened, and the size and weight of the device are reduced. In FIG. 2, a needle bearing 36 is provided between the carrier 15 and the outer race 32A of the ball bearing 32, and thrust support of the carrier 15 is received by the outer race 32A of the ball bearing 32. In this case, the diameter of the needle bearing 36 is increased.

Therefore, since the needle bearing 36 and the needle bearing 33 are coaxially arranged above and below, the total length of the transfer device can be shortened by about 7 mm. As a result, the size and weight of the device can be reduced. Further, since the diameter of the needle bearing 36 is increased, the amount of deflection of the carrier 15 in the thrust direction is reduced, and the support rigidity of the carrier 15 in the thrust direction can be improved. As a result, the durability of the planetary gear mechanism 12 can be improved.

Further, in the above embodiment, the thrust force mainly generated by the manufacturing error of the carrier 15 is transmitted to the casing 17 via the inner race of the ball bearing 32 and the balls, but in this embodiment, Since the outer force 32A of the ball bearing 32 is directly transmitted to the casing 17, and the thrust force does not need to be applied to the ball 32B of the ball bearing 32, the durability of the ball bearing 32 can be improved.

In this embodiment, since the diameter of the needle bearing 36 is increased, the permissible rotation speed of the needle bearing 36 itself is reduced. However, in this embodiment, since the actually used rotation speed of the needle bearing 36 is the same as the carrier rotation speed, N / ti (N: sun gear rotation speed = inner race rotation speed of the ball bearing 32, ti = planetary gear) The low gear ratio of the mechanism 12) rpm, which is lower than the actually used rotation speed (N-N / ti) rpm of the above embodiment.

From the above, if ti is set to a gear ratio of about 2.6, in the present embodiment as well, even if the permissible rotational speed of the needle bearing 36 itself is reduced by, for example, 40%, the actual rotational speed is reduced. Also, since it is reduced by 40%, it is possible to use it in the same manner as in the above embodiment.

[0021]

[Effect of device]

 As described above, it is possible to downsize the need bearing used for supporting the carrier in the thrust direction, improve the rotational runout accuracy of the main shaft, and improve the sound vibration performance. . In addition, in another embodiment, the total length of the transfer device can be shortened, the size and weight of the transfer device can be reduced, and the supporting rigidity of the carrier can be improved. The durability can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

[Explanation of Codes] 11: Sun Gear 11A: Step 12: Planetary Gear Mechanism 13: Input Shaft 14: Planetary Gear 15: Carrier 16: Ring Gear 17: Casing 18: Switching Mechanism 19: Main Shaft 20: Hub 21: Sleeve 22 : Fork 23: Sprocket 24: Bearing 25: Chain 26, 27: Hub 28: Sleeve 29: Fork 30: Radial needle bearing 31: Radial ball bearing 32: Ball bearing 32A: Outer race 32B: Ball 33, 34, 35, 36 :Needle Bearing

Claims (3)

[Scope of utility model registration request] 1. A transfer device having a planetary gear mechanism that switches between a low speed stage and a high speed stage and transmitting the rotational force of the planetary gear mechanism to front wheels and rear wheels, wherein the transfer device is supported on the same axis as the planetary gear mechanism. A transfer device, characterized in that the main shaft is supported in the radial direction via two radial bearings, and the thrust force of the sun gear of the planetary gear mechanism is received by a ball bearing supporting the sun gear. 2. The two radial bearings, one of which is a needle bearing for supporting the main shaft with respect to the sun gear, and the other of which is the ball bearing for supporting the sun gear with respect to the case. 1 transfer device. 3. A transfer device having a planetary gear mechanism for switching between a low speed stage and a high speed stage and transmitting the rotational force of the planetary gear mechanism to front wheels and rear wheels, wherein a ball supporting a sun gear of the planetary gear mechanism in a case. A transfer device, wherein a needle bearing is provided between the outer race of the bearing and the carrier of the planetary gear mechanism.