JP2577739Y2 - Planetary roller type power transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary roller type power transmission.

[0002]

2. Description of the Related Art As shown in FIG. 2, a planetary roller type power transmission device comprises a casing 1 in which a first shaft 2 and a second shaft 3 which face each other in a coaxial relationship are connected via a planetary roller mechanism. I have.

[0003] A shaft end on the second shaft side of the first shaft 2 rotatably supported by a rolling bearing 4 in the casing 1 has:
The carrier disk portion 5 is fixed, and a plurality (for example, 3 to 4) of planetary rollers 8 are supported around the carrier disk portion 5 so as to be rotatable around an axial line.

A sun roller 10 is formed at the shaft end of the second shaft 3 on the first shaft side, and the inner peripheral surface step 1a in the casing 1 has the axial length of the planetary roller 8 in the axial direction. An annular plate flange member 1 having an axial thickness approximately equal to
Stud bolt 1 that penetrates axially integrally with 2 and 12
The flange members 12, 12 are held by sandwiching both end faces of the planetary roller 8. The planetary rollers 8, 8 # are circumscribed by the sun roller 10 and are also circumscribed by the inner peripheral surface of the peripheral race 11, that is, the race surface 11a.

Since the planetary roller 8 is circumscribed by the small-diameter sun roller 10 and inscribed by the large-diameter orbital surface 11a, the contact area per unit length in the axial direction is larger on the inscribed side. In order to equalize the surface pressure between the roller 10 and the raceway surface 11a, the planetary roller 8 is circumscribed over the entire length of the sun roller 10 while the width of the raceway surface 11a is reduced.
The length of the inscribed length of the planetary roller 8 is reduced by setting the length in the axial direction to about 1/3 to 1/2.

Therefore, the inner peripheral portion of the bearing ring 11 has a raceway surface 11a.
Both ends are slightly cut away so as not to affect the through holes of the studs 13 and 13 ', leaving the raceway surface 11a so that only the projecting surface protrudes.

[0007]

In the planetary roller type power transmission device according to the prior art described above, the cylindrical bearing ring 11 has an inner peripheral portion having a raceway surface 11a, and both end surfaces having stud bolts 13,13.貫通 is slightly cut out so as not to affect the through hole of ‥. The outer diameter is substantially equal to the inner diameter of the casing, the raceway surface 11a is the inner circumferential surface, and the axial thickness is the axial line of the planetary roller 8. It is a cylinder of a reasonable weight, approximately equal to the length in the direction. Therefore, no consideration is given to reducing the weight of the planetary roller type power transmission device. This invention aims to reduce the weight by improving the race of the planetary roller type power transmission device.

[0008]

In the planetary roller type power transmission device of the present invention, a sun roller shaft and a planetary roller carrier shaft which are opposed to each other in a coaxial relationship are rotatably supported by a casing, respectively. The planetary roller rotatably supported at the eccentric position of the carrier is inscribed in the raceway ring and circumscribes the sun roller, and the axial thickness of the raceway ring is formed smaller than the axial length of the planetary roller.

The flange member formed by the outer peripheral flange portion, the inner peripheral flange portion, and a cylindrical step portion intermediate between the outer flange portion and the inner peripheral flange portion has the outer peripheral flange portion integrally fixed to the casing with both end surfaces of the race ring interposed therebetween. The inner peripheral side flange portion holds the both end surfaces of the planetary roller having an axial length larger than the axial thickness of the bearing ring.

[0010]

The planetary roller type power transmission device has a first shaft,
The second shaft and the race, that is, the casing, are the input side,
It is selectively connected to the output side and the fixed side as appropriate. For example, when the casing is on the fixed side, the first shaft is an input shaft, and the second shaft is an output shaft, a speed increasing device is obtained.

Then, when the first shaft is rotated, the carrier is integrally rotated, and the planetary rollers are frictionally rolled on the raceway surface.
While rotating, the sun roller revolves around the axis of the first shaft, and accordingly, the sun roller is rotated at a higher speed than the first shaft and rotates frictionally.
That is, the second shaft, which is the output shaft, rotates at a higher speed than the first shaft.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A planetary roller type power transmission device in an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a first shaft 2 and a second shaft 3 which are opposed to each other in a coaxial relationship within a casing 1 are connected via a planetary roller mechanism.

A shaft end on the second shaft side of the first shaft 2 rotatably supported by a rolling bearing 4 in the casing 1 includes:
The carrier disk portion 5 is fixed, and a plurality of (for example, 3 to 4) drive pin holes 6 are provided around the carrier disk portion 5.
6 さ れ are equally circumferentially and axially drilled, and a drive pin 7 is press-fitted or shrink-fitted into each drive pin hole 6. Each drive pin 7 has a center hole 8a of the planetary roller 8
Are inserted, and between the outer peripheral surface of the drive pin 7 and the inner peripheral surface of the center hole 8a of the planetary roller 8, there are interposed rows of needle rollers 9, 9 ‥ held by a retainer. , And is rotatably supported by the drive pin 7.

A sun roller 10 is formed at the shaft end of the second shaft 3 on the first shaft side, and a race 11 and annular flange members 12, 12 sandwiching both end surfaces thereof are integrally formed. Become casing 1
The casing 1 is fitted with circumferentially equally spaced studs 13, 13 さ れ which are fitted to the inner peripheral surface of the inside and penetrate in the axial direction as described later.
Is fixed to the inner peripheral surface step 1a. The planetary rollers 8, 8 # are circumscribed by the sun roller 10, and
It is inscribed in the inner peripheral surface of the bearing ring 11, that is, the bearing surface 11a.

Since the planetary roller 8 is circumscribed by the small-diameter sun roller 10 and inscribed by the large-diameter orbital surface 11a, the contact area per unit length in the axial direction is larger on the inscribed side. In order to equalize the surface pressure between the roller 10 and the raceway surface 11a, the planetary roller 8 is circumscribed over the entire length of the sun roller 10 while the width of the raceway surface 11a is reduced. About 1/3 to 1/2 of the axial length of
Thus, the inscribed width of the planetary roller 8 is reduced.

Therefore, the bearing ring 11 itself is formed so that the thickness in the axial direction is about ３ to の 長 of the axial length of the planetary roller 8. That is, the race 11 is preferably a plate-like ring having a uniform thickness of about 1/3 to 1/2 of the axial length of the planetary roller 8.

The flange member 12 is formed of an outer peripheral flange portion 12a, an inner peripheral flange portion 12b, and a cylindrical step portion 12c intermediate between the outer flange portion 12a and the inner peripheral flange portion 12b.
a are integrally formed with both end faces of the race ring 11 interposed therebetween, and studs 13, 13 の arranged at equal circumferences are axially penetrated and fixed to the inner peripheral surface step 1 a in the casing 1. The circumferential flange portions 12b, 12b hold the both end surfaces of the planetary roller 8 having an axial length larger than the axial thickness of the bearing ring 11. An appropriate number of oil holes 12d, 12d # are formed in the cylindrical step 12c of the flange member 12. Therefore, the annular spaces 14 and 14 surrounded by the flange member 12 and the bearing ring 11 in the outer peripheral area of the planetary roller row form the space 15 in the casing.
And an oil hole 12d.

The above-mentioned planetary roller type power transmission device has a first
The shaft 2, the second shaft 3, and the bearing ring 11, that is, the casing 1, are selectively connected to the input side, the output side, and the fixed side as appropriate.
For example, when the casing 1 is on the fixed side, the first shaft 2 is an input shaft connected to a drive source (not shown), and the second shaft 3 is an output shaft connected to a driven device, a speed increasing device is obtained.

Then, when the first shaft 2 is rotated, the carrier disk portion 5 is integrally rotated, and the drive pin 7 revolves. Then, the planetary rollers 8, 8 # frictionally roll on the raceway surface 11a, that is, revolve around the axis of the first shaft 2 while rotating around the axis of the drive pin 7 through the needle rollers 9, 9 #. Accordingly, the sun roller 10 is frictionally rotated at an increased speed from the first shaft 2. That is, the second shaft 3, which is the output shaft, rotates at a higher speed than the first shaft 2.

The traction grease sealed in the space 15 in the casing 1 lubricates the needle roller bearings, flows into the annular spaces 14, 14 through the oil holes 12d, and the outer peripheral surfaces of the planetary rollers 8, 8 #. Prevents image sticking.

[0021]

In the planetary roller type power transmission device according to the present invention, the orbital ring is a plate-like ring body having an axial thickness less than the orbital surface width smaller than the axial length of the planetary roller. Since the thickness in the axial direction is much thinner than the race of the planetary roller type power transmission device according to the technology, the weight is reduced.
That leads to weight reduction of the planetary roller type power transmission device itself.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a planetary roller type power transmission device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional planetary roller type power transmission device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 1a Inner peripheral surface step part 2 1st shaft 3 2nd shaft 4 Rolling bearing 5 Carrier disk part 6 Drive pin hole 7 Drive pin 8 Planetary roller 8a Center hole 9 Needle roller 10 Sun roller 11 Track ring 11a Track surface 12 Flange member 12a Outer flange 12b Inner flange 12c Cylindrical step 12d Oil hole 13 Stud bolt 14 Annular space 15 Outside space

Continuation of front page (56) References JP-A-54-65260 (JP, A) JP-A-61-218863 (JP, A) JP-A-60-189647 (JP, U) JP-A-64-14949 (JP) , U) (58) Fields surveyed (Int.Cl. ⁶ , DB name) F16H 13/08

Claims (1)

(57) [Scope of request for utility model registration] A sun roller shaft and a planetary roller carrier shaft opposed to each other in a coaxial relationship are rotatably supported by a casing, and the planetary roller rotatably supported at an eccentric position of the carrier of the planetary roller carrier shaft. , Which is inscribed in the bearing ring and circumscribes the sun roller, the axial thickness of the bearing ring is formed smaller than the axial length of the planetary roller, and the outer peripheral flange portion, the inner peripheral flange portion, and a cylindrical step between the two. The outer flange portion is fixed to the casing integrally with the bearing ring with both end surfaces of the bearing ring interposed therebetween, and the inner peripheral flange portion has an axial direction larger than the axial thickness of the bearing ring. A planetary roller type power transmission device adapted to hold both end surfaces of a planetary roller having a length.