JPH10181367A - Sprocket device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately adjust the phase of sprocket teeth between two chain units. SOLUTION: This device is provided with a gearing member and four sprockets 51 to 54 installed in the axial direction of this gearing member, while each of these sprockets 51 to 54 is equipped with a sprocket tooth engaging with two chains 55 and 56 on the outer circumference, and a spline tooth for doing a spline connection with the gearing member on the inner circumference, respectively, and each of these sprockets 51 to 54 is fitted in the gearing member after shifting a phaseal portion of the specified number of spline teeth. In this case, only when these respective sprockets 51 to 54 and the gearing member are fitted with one another after shifting the phaseal portion of the specified number of the spline teeth, the phase of sprocket tooth is accurately shiftable between two chain units. There is no need of any special phase alignment, and thus the phase of the sprocket tooth is accurately adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sprocket device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, an automatic transmission mounted on a four-wheel drive type vehicle has a transmission that performs a predetermined shift by receiving torque from an engine, and outputs torque output from the transmission for front wheels and rear wheels. It has a transfer for distributing to the wheels and a chain transmission mechanism for transmitting torque for the front wheels to the drive shaft of the front wheels. The chain transmission mechanism is a drive-side sprocket connected to the transfer, a driven-side sprocket connected to the drive shaft of the front wheel, and stretched between the drive-side sprocket and the driven-side sprocket. Consists of a chain.

[0003] When the torque transmitted by the chain transmission mechanism is large, it is desirable to increase the sprocket teeth of the driving sprocket and the driven sprocket. The noise generated sometimes increases. Therefore, a chain transmission mechanism is configured by arranging a plurality of chain units including the driving sprocket, the driven sprocket, and the chain in the axial direction of the output shaft, and the phase of the sprocket teeth between the chain units is changed in the rotation direction. And a method of manufacturing the sprocket device in which the sprocket device is shifted by a predetermined amount is provided (JP-A-6-12949).
7 and JP-A-7-42802).

In this case, assuming that the number of chain units is n, it is necessary to shift the phase of the sprocket teeth between each chain unit by 1 / n teeth. Therefore, one for each sprocket on each drive side and one for each sprocket on the driven side.
/ N teeth are shifted to form connection holes, and a knock pin, a bolt, and the like are penetrated into each connection hole and fastened by positioning each drive side sprocket and each driven side sprocket.

[0005] Therefore, since the transmitted torque is shared by each chain unit, a large torque can be transmitted without increasing the sprocket teeth. In addition, the timing of meshing (engaging) between the drive sprocket and the driven sprocket and the chain is shifted between the chain units, so that noise generated when transmitting torque can be reduced.

[0006]

However, in the conventional chain transmission mechanism, the driving sprocket and the driven sprocket are positioned by tightening the connecting holes by passing the knock pins, bolts and the like through the connecting holes. Therefore, if there is a variation in the position where each connection hole is formed or a variation in the tightening force of the knock pin, bolt, etc., the phase of the sprocket teeth between each chain unit can be accurately set to 1 / n. It becomes difficult to shift only the teeth.

[0007] When performing the gear cutting with the gear cutting machine, the machining accuracy varies with each gear cutting and with the aging deterioration of the cutting gear cutting tool. Therefore, it is difficult to accurately shift the phase of the sprocket teeth by 1 / n teeth. Therefore, the phase of the sprocket teeth cannot be accurately adjusted between the chain units. Moreover, knock pins,
Since bolts etc. are used, the number of parts increases accordingly,
Not only does the weight of the chain transmission mechanism increase, but also the cost of the chain transmission mechanism increases.

The present invention solves the above-mentioned problems of the conventional chain transmission mechanism, and can accurately adjust the phase of the sprocket teeth between the chain units, without increasing the weight of the chain transmission mechanism. It is an object of the present invention to provide a sprocket device capable of reducing the cost of a chain transmission mechanism and a method of manufacturing the same.

[0009]

For this purpose, a sprocket device according to the present invention has a transmission member and a plurality of sprockets arranged in the axial direction of the transmission member. The sprocket teeth meshing with the transmission member are provided on the inner periphery for spline connection with the transmission member, and each sprocket is engaged with the transmission member by being shifted from each other by a predetermined number of phases of the spline teeth.

[0010] In another sprocket device of the present invention, the sprocket is positioned with respect to the transmission member by positioning means provided at both ends.
In the method of manufacturing a sprocket device according to the present invention, a plurality of rows of sprocket teeth are formed on the outer periphery of the prototype sprocket corresponding to the plurality of chain units, and the number of the sprocket teeth and the number of chain units are formed on the inner periphery of the prototype sprocket. After forming a set number of spline teeth based on the number of sprockets, the prototype sprocket is divided axially into sprockets for each chain unit.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram of a first main part of an automatic transmission according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of a second main part of an automatic transmission according to the first embodiment of the present invention. FIG. 3 is a sectional view of the chain chamber according to the first embodiment of the present invention, and FIG.
It is a figure showing the sprocket device by the side of the drive of the chain transmission mechanism in an embodiment.

In FIG. 1, reference numeral 11 denotes a transmission for performing a predetermined shift, and reference numeral 12 denotes a rear side of the transmission 11 (to the right in FIG. 1).
The chain transmission mechanism 13 is provided with a transfer disposed further behind the chain transmission mechanism 12. The torque output from the transmission 11 is distributed to the front wheels and the rear wheels by the transfer 13,
The torque for the front wheels is transmitted to the drive shaft of the front wheels (not shown) by the chain transmission mechanism 12.

The transfer 13 has a planetary gear unit 15 and a clutch C. The planetary gear unit 15 includes a sun gear S, a pinion P, a ring gear R, and a carrier CR. Output from the ring gear R. In addition, the clutch C limits the differential by the planetary gear unit 15 by engaging the sun gear S and the carrier CR by a predetermined amount. For this purpose, the sun gear S and the sleeve 16 as a transmission member are connected, the carrier CR and the output shaft 17 of the transmission 11 are connected to each other, and the ring gear R and the rear wheel output shaft 18 are connected to each other. The rear wheel output shaft 18 is connected to a rear wheel differential device (not shown), and the torque transmitted to the rear wheel output shaft 18 is distributed to left and right drive wheels (not shown) by the rear wheel differential device.

A hydraulic servo C-1 is provided to disengage the clutch C. The hydraulic servo C-1 is
An oil chamber 2 formed between the clutch cylinder 21 and the piston 22, comprising a clutch cylinder 21 and a piston 22 sliding (sliding) in the clutch cylinder 21.
3 is supplied with oil at a predetermined pressure from the valve body 20. Therefore, the valve body 20
Is provided with a linear solenoid valve 24.

A chain case 30 of the chain transmission mechanism 12 is provided behind the automatic transmission case 28 of the transmission 11, and a transfer case 33 of the transfer 13 is further provided behind the chain case 30, respectively. The case 30 includes a case front 31 and a case rear 32. A recess 35 is formed at the front end (left end in FIG. 1) of the rear wheel output shaft 18, in which the rear end (right end in FIG. 1) of the output shaft 17 is connected to the carrier CR and the spline. Combined
The carrier CR and the carrier CR are rotatably supported by the bearing 36 with respect to the rear wheel output shaft 18. The front end of the rear wheel output shaft 18 is rotatably supported by the transfer case 33 by a bearing 37. Further, the front end of the sleeve 16 is rotatably supported with respect to the case front 31 by a bearing 39 as positioning means, and the center of the sleeve 16 is rotatably supported with respect to the case rear 32 by a bearing 40 as positioning means. You.

The torque output from the sun gear S is transmitted via the sleeve 16 to the chain transmission mechanism 12.
And transmitted to the front wheel output shaft 43 as a transmission member via the chain transmission mechanism 12. For this purpose, a chain chamber 45 is formed in the chain case 30, and a plurality of chain units are provided in the chain chamber 45.
In the present embodiment, first and second chain units 47 and 48 are provided. And, the front wheel output shaft 43
Are rotatably supported by a bearing 71 as positioning means so as to be rotatable with respect to the case front 31 and a bearing 72 as positioning means so as to be rotatable with respect to the case rear 32.

Each of the first and second chain units 4
7 and 48 are drive-side sprockets 51 and 5 respectively.
2. Driven sprockets 53 and 54 and chain 5
5 and 56, and the chain 55 includes a sprocket 51,
Between 53, a chain 56 is stretched between the sprockets 52, 54, respectively. The sleeve 16 and the sprockets 51 and 52 are spline-connected, and the front wheel output shaft 43 and the sprockets 53 and 54 are spline-connected. In addition, each of the sprockets 5
1, 52 are positioned by bearings 39, 40 fitted at both ends to the sleeve 16, and the sprockets 53, 54 are positioned by bearings 71, 72 fitted to the front wheel output shaft 43 at both ends. The sleeve 16 and each sprocket 51,
A drive side sprocket device is constituted by 52, and a driven sprocket device is constituted by the front wheel output shaft 43 and the sprockets 53, 54.

Therefore, the torque transmitted to each sprocket 51, 52 via the sleeve 16 is applied to the chain 5
The power is transmitted to the respective sprockets 53 and 54 via the wheels 5 and 56 and further transmitted to the front wheel output shaft 43. The front wheel output shaft 43 is connected to a front wheel differential device (not shown), and the torque transmitted to the front wheel output shaft 43 is distributed to left and right drive wheels (not shown) by the front wheel differential device.

By the way, in order to reduce the noise generated when the torque is transmitted by the chain transmission mechanism 12,
The phases of the sprocket teeth Te1, Te2 are shifted by a predetermined amount in the rotation direction between the first and second chain units 47, 48. In this case, since the number m of the first and second chain units 47 and 48 is two,
The phase of the sprocket teeth Te1 and Te2 is shifted by 1 / m = 1/2 [teeth] between the second chain units 47 and 48.

Therefore, the torque transmitted through the chain transmission mechanism 12 is shared by the first and second chain units 47 and 48, and the sprocket teeth T
A large torque can be transmitted without increasing e1 and Te2. Moreover, each sprocket 51, 5
2 and each sprocket 53, 54 and chain 55, 56
Is shifted between the first and second chain units 47 and 48, so that noise generated when transmitting torque can be reduced.

Next, each of the first and second chain units 4
At 7 and 48, the phase of the sprocket teeth Te1 and Te2 is 1 /
A method of manufacturing a sprocket device for shifting by 2 [teeth] will be described. In this case, the driving-side sprocket device and the driven-side sprocket device are both formed by the same manufacturing method. Therefore, only the driving-side sprocket device will be described.

FIG. 5 is a front view of a prototype sprocket according to the first embodiment of the present invention, FIG. 6 is a cross-sectional view of the prototype sprocket according to the first embodiment of the present invention, and FIG. FIG. 8 is an enlarged view of a prototype sprocket according to the embodiment, and FIG. 8 is a sectional view of a driving sprocket according to the first embodiment of the present invention. First, the first and second chain units 47 are attached to the outer periphery of the prototype sprocket 65.
(FIG. 1), corresponding to 48, a plurality of rows of sprocket teeth, that is, sprocket teeth T for sprocket 51
The sprocket teeth Te2 for the e1 and the sprocket 52 are formed, and a common spline tooth 68 is formed on the inner periphery of the prototype sprocket 65. And the sprocket teeth Te
1, when the number of Te2 is N and the number of the spline teeth 68 is n, n = m · N. Here, m is the first and second chain units 4
7, 48.

In this case, in this embodiment, FIG.
As shown in FIG. 5, the peak M2 of each spline tooth 68 is located on each line L1 connecting the peak M1 of each sprocket tooth Te1, Te2 and the center of the prototype sprocket 65,
The peak M2 of each spline tooth 68 is located on each line L2 connecting the valley V1 of each sprocket tooth Te1 and Te2 to the center of the prototype sprocket 65, but each sprocket tooth Te1 and Te2 and each spline It is not necessary to precisely match the phase with the teeth 68.

On the other hand, spline teeth (not shown) are formed on the outer periphery of the sleeve 16 in correspondence with the spline teeth 68. In this case, the number of spline teeth on the outer periphery of the sleeve 16 is equal to the number n of the spline teeth 68. Next, center the prototype sprocket 65 in the axial direction,
That is, cutting is performed at the line L3, and the sprocket 51,
52 are separated. Thus, the sprocket 5
1 and 52 are formed by the number m of the first and second chain units 47 and 48. Subsequently, the sprocket 51,
52 are shifted from each other by the phase of one spline tooth 68 and fitted to the sleeve 16.

As a result, the phase of the sprocket teeth Te1 and Te2 can be accurately shifted by 1 / m = 1/2 [teeth] between the first and second chain units 47 and 48. Therefore, the phase of the sprocket teeth Te1 and Te2 can be adjusted with high accuracy without requiring special phase matching.

Then, even if the processing accuracy varies with each gear cutting operation and with the aging deterioration of the cutting gear cutting tool, even if the first and second chain units 4
Since the sprockets 51 and 52 are formed simultaneously, the same sprocket teeth Te1, Te2 and spline teeth 68 can be formed in the sprockets 51 and 52. Therefore, the phase of the sprocket teeth Te1 and Te2 can be adjusted with high accuracy without requiring special phase matching.

Further, since no knock pins, bolts and the like are used, the number of parts is reduced accordingly, so that not only the weight of the chain transmission mechanism 12 can be reduced, but also the cost of the chain transmission mechanism 12 can be reduced. .
In the present embodiment, the number n of the spline teeth 68 is set as n = m · N, but may be n = amN (a is a positive integer). In this case, the sprockets 51 and 52 of the first and second chain units 47 and 48 are fitted with the sleeve 16 with a phase shift of a number of spline teeth 68 relative to each other.

The sleeve 16 and each sprocket 5
The spline connection between the front wheels 1 and 52 and between the front wheel output shaft 43 and the respective sprockets 53 and 54 can be performed by serration to eliminate play. In the present embodiment, the sprocket teeth Te1, Te2 and the spline teeth 68 are formed by a gear cutting machine, but they may be formed by sintering, forging, or the like.

Next, a second embodiment of the present invention will be described. FIG. 9 is a view showing a drive-side sprocket device of a chain transmission mechanism according to a second embodiment of the present invention. In this case, since the sprocket device on the driving side and the sprocket device on the driven side have the same structure,
Only the drive-side sprocket device will be described.

In the figure, 39 and 40 are bearings, 1
51 and 152 are drive-side sprockets, and 161 is a sleeve as a transmission member. Each sprocket 15
A drive-side sprocket device is constituted by 1, 152 and the sleeve 161. In this case, each sprocket 1
51 and 152 are snap rings 153 as positioning means attached to the sleeve 161 at both ends.
154.

The present invention is not limited to the above embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0032]

As described in detail above, according to the present invention, a sprocket device has a transmission member and a plurality of sprockets arranged in the axial direction of the transmission member. The sprocket teeth meshing with the chain are provided on the outer circumference, and the spline teeth for spline connection with the transmission member are provided on the inner circumference, and each sprocket is fitted with the transmission member by being shifted from each other by a predetermined number of phases of the spline teeth. .

In this case, the phase of the sprocket teeth can be accurately shifted between the chain units only by fitting each sprocket and the transmission member by shifting the phase of the predetermined number of spline teeth from each other. Therefore, it is possible to accurately adjust the phase of the sprocket teeth without requiring special phase matching.

Moreover, since no knock pins, bolts and the like are used, the number of parts is reduced accordingly, so that not only the weight of the chain transmission mechanism can be reduced, but also the cost of the chain transmission mechanism can be reduced. And
Since the torque transmitted via the chain transmission mechanism is shared by each chain unit, a large torque can be transmitted without increasing the sprocket teeth. In addition, since the engagement timing between the sprocket and the chain is shifted between the chain units, it is possible to reduce generated noise.

In the method for manufacturing a sprocket device according to the present invention, a plurality of rows of sprocket teeth are formed on the outer periphery of the prototype sprocket so as to correspond to a plurality of chain units.
On the inner periphery of the prototype sprocket, the number of the sprocket teeth,
After forming a set number of spline teeth based on the number of chain units and the number of chain units, the prototype sprocket is divided into sprockets for each chain unit in the axial direction.

In this case, the sprockets of the respective chain units are formed at the same time even if the machining accuracy varies with each gear cutting operation and with the aging deterioration of the cutting gear cutting tool. The same sprocket teeth and spline teeth can be formed on the sprocket. Therefore, it is possible to accurately adjust the phase of the sprocket teeth without requiring special phase matching.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first main part of an automatic transmission according to a first embodiment of the present invention.

FIG. 2 is a second main part schematic diagram of the automatic transmission according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a chain chamber according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a drive-side sprocket device of the chain transmission mechanism according to the first embodiment of the present invention.

FIG. 5 is a front view of a prototype sprocket according to the first embodiment of the present invention.

FIG. 6 is a sectional view of a prototype sprocket according to the first embodiment of the present invention.

FIG. 7 is an enlarged view of a prototype sprocket according to the first embodiment of the present invention.

FIG. 8 is a sectional view of a driving sprocket according to the first embodiment of the present invention.

FIG. 9 is a diagram showing a drive-side sprocket device of a chain transmission mechanism according to a second embodiment of the present invention.

[Explanation of symbols]

 16 Sleeve 39, 40, 71, 72 Bearing 43 Front wheel output shaft 47 First chain unit 48 Second chain unit 51, 52, 151, 152 Drive sprocket 53, 54 Driven sprocket 55, 56 Chain 65 Prototype Sprocket 68 Spline teeth 153, 154 Snap ring Te1, Te2 Sprocket teeth

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[Procedure amendment]

[Submission date] January 16, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9

Claims (3)

[Claims] 1. A transmission member comprising: a transmission member; and a plurality of sprockets disposed in the axial direction of the transmission member. Each of the sprockets has sprocket teeth meshing with a chain on an outer periphery, and a spline connection with the transmission member on an inner periphery. The sprocket device is provided with spline teeth, and each sprocket is engaged with the transmission member by being shifted from each other by a predetermined number of phases of the spline teeth. 2. The sprocket device according to claim 1, wherein the sprocket is positioned with respect to the transmission member by positioning means provided at both ends. 3. A plurality of rows of sprocket teeth are formed on an outer periphery of a prototype sprocket corresponding to a plurality of chain units, and are set on an inner periphery of the prototype sprocket based on the number of the sprocket teeth and the number of chain units. A method of manufacturing a sprocket device, comprising: forming a predetermined number of spline teeth; and dividing the prototype sprocket into sprockets for each chain unit in the axial direction.