JPH0596435A - Tool adapter with built-in planetary roller accelerating mechanism - Google Patents

Abstract

PURPOSE:To increase the diameter of a hollow shaft part by drilling planetary roller insertion holes in four parts of the hollow shaft part in a rotary part point end, forming planetary roller driving pin mounting grooves in both ends of the insertion hole, and mounting a planetary roller to a driving pin through a deep groove ball bearing. CONSTITUTION:In a rotary part, a point end hollow shaft part 1, intermediate grooved flange part 2 and a rear end tapered shank 3 are coaxially formed, and in an intermediate part of the hollow shaft part 1, four insertion holes 5 for inserting a radial planet roller 10, inserted through a center hole from the peripheral surf ace, are drill Mounting grooves 6a, 6b of quadrilateral section for a drive pin 7, mounting the planet roller 10, are formed successively to both ends of the insertion hole 5. Inner rings of twin seal-provided deep groove ball bearings 9 are fitted by interposing a sleeve 8 to the drive pin 7 formed with quadrilateral shaft necks 7a, 7b, and outer rings are fitted to the planet roller 10. Accordingly, the four planet rollers 10 are mounted positioned in an axial line direction by the bearings 9, and a peripheral surface diameter of the hollow shaft part 1 can be formed to a large diameter in the vicinity of an internal diameter of a ring-shaped fixed track surface 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool adapter with a planetary roller speed increasing mechanism.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional tool adapter with a planetary roller speed-increasing mechanism has a tool adapter with a planetary roller speed-increasing mechanism which is inserted into a spindle of a machine tool such as a machining center. Part, a fixed part such as a spindle head, which is removably engaged with a fixed side, and a tool mounting part for mounting a tool.

The rotating portion is formed by integrally forming a hollow shaft portion 1 at the tip, a flanged portion 2 with a groove in the middle, and a tapered shank 3 at the rear end in a coaxial relationship. In the middle part of the hollow shaft part 1,
Three insertion holes 5 for inserting a planetary roller having a rectangular cross section are radially formed from the outer peripheral surface so as to penetrate the center hole 4, and the planetary roller 10 has a drive pin 7 in the insertion hole 5 at a central angle of 120 degrees. Thus, it is rotatably attached to the hollow shaft portion 1.

The rotating portion is rotatably supported by the rolling bearings 50 and 51 on the fixed portion. In the hollow housing 20 of the fixed portion, a ring-shaped fixed raceway surface 22 is formed on the inner peripheral surface thereof. The outer rings of the rolling bearings 50, 51 are fixed with the annular thrust metal 53 sandwiched between the front and rear end faces thereof. The outer peripheral surface of the planetary roller 10 is engaged with the ring-shaped fixed raceway surface 22.

The tool mounting portion is a rotary shaft 30 rotatably inserted into the central hole 4 of the hollow shaft portion 1 via rolling bearings (for example, angular ball bearings having ceramic balls) 54 and 55.
The rear end portion of the rolling bearings 54, 55 protruding rearward from the bearing area is connected to the sun roller portion 32 and circumscribes the planetary roller 10, and the tip end portion protrudes from the tip hole of the cap-shaped member 14 of the rotating portion. A taper hole into which the taper shank of the tool is inserted is formed. After all, ring-shaped fixed raceway surface 22, planetary roller
The planetary roller speed-up mechanism is constituted by 10 and the sun roller portion 32.

[0006]

In the conventional tool adapter with a built-in planetary roller speed increasing mechanism as described above, the rotating portion is rotated by the rolling bearings 50 and 51 on the front and rear sides of the ring-shaped fixed raceway surface 22 on the fixed portion. Since the planetary roller 10 is freely supported and the planetary roller 10 is supported by the drive pin 7 as a needle roller bearing, the front and rear end faces of the ring-shaped fixed raceway surface 22 and the rolling bearing are prevented so that the planetary roller 10 does not interfere with the rolling bearings 50 and 51. An annular thrust metal 53 is fitted between the outer ring of 50 and 51,
Since the annular thrust metal 53 needs to contact the end surface of the planetary roller 10, its inner diameter is smaller than that of the ring-shaped fixed raceway surface 32, and it must be in non-contact with the axial positioning sleeves of the rolling bearings 50, 51. I won't. Therefore, the diameter of the hollow shaft portion 1 of the rotating portion is naturally limited, the number of the planetary rollers 7 is also limited to 3, and the transmission torque and the rigidity are also limited.

Further, the annular thrust metal 53 for positioning the planetary rollers and the rolling bearings 10 and 11 naturally increase the length and weight of the tool adapter incorporating the planetary roller speed-up mechanism. As a result, when it is used by being attached to the spindle of a machine tool, it cannot be used depending on the size of the workpiece, and the allowable weight of the automatic tool changer may be exceeded. The present invention is intended to reduce the size of a tool adapter with a planetary roller speed increasing mechanism in order to solve the above problems.

[0008]

A planetary roller speed-up mechanism built-in tool adapter according to the present invention has a center part in the axial direction formed in the front half and a rotary part mounted in the main shaft of a machine tool in the latter half, and a rotary part. The fixed part, which is a hollow housing that is rotatably fitted and supported by the front half of the machine part, is engaged and disengaged with the fixed side of the machine tool. It is rotatable with respect to the rotating part, and is connected to the rotating part through a planetary roller speed-up mechanism, and is composed of a tool mounting part for attaching a tool to the tip part. The planetary roller inserted into each insertion hole of the planetary rolling element insertion hole that is radially drilled is rotatably and axially positioned via a deep groove ball bearing on a drive pin attached to the hollow shaft. Installed and installed The peripheral surface partly protrudes slightly from the outer peripheral surface of the hollow shaft part, and is inscribed in the annular fixed raceway surface of the hollow housing, and the hollow housing is rotatably supported on the hollow shaft part by a planetary roller and a deep groove ball bearing, and is a rolling bearing. The sun roller portion formed in the tool attachment portion rotatably inserted into the center hole of the hollow shaft portion via the circumscribes the planet roller protruding from the inner opening of the insertion hole.

[0009]

When the main shaft of the machine tool equipped with the tool adapter with the planetary roller speed increasing mechanism is rotationally driven, the rotating part rotates with respect to the hollow housing connected to the fixed side of the machine tool. Then, the planetary roller rotatably / rotatably supported on the first half of the rotating portion rotates while contacting with the ring-shaped fixed raceway surface of the hollow housing and the outer periphery of the sun portion of the tool mounting portion, and revolves around the spindle axis. Then, the sun part, that is, the tool attached to the tool mounting portion rotates at a speed higher than the rotation of the rotating portion, that is, the main shaft.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tool adapter with a planetary roller speed increasing mechanism according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a tool adapter with a planetary roller speed-up mechanism is fixed to a rotating part inserted into a spindle of a machine tool such as a machining center so as to be engaged with and disengaged from a fixed side such as a spindle head. And a tool mounting portion for mounting a tool.

The rotating portion is formed by integrally forming a hollow shaft portion 1 at the tip, a flanged portion 2 having a groove in the middle, and a taper shank 3 at the rear end in a coaxial relationship. In the middle part of the hollow shaft part 1,
Insertion holes 5 for radially inserting the planetary roller having a rectangular cross-section penetrating from the outer peripheral surface to the center hole 4 are bored at four positions with a center angle of 90 degrees, and the hollow shaft portion 1 of the insertion hole 5 is Following both ends in the axial direction, mounting grooves 6a and 6b having a quadrangular cross section for the planetary roller drive pin are formed (see FIG. 2).

Inner rings of two deep groove ball bearings 9 and 9 with seals are fitted to drive pins 7 (see FIG. 2) having shafts 7a and 7b having a substantially quadrangular cross section, which are sandwiched by sleeves 8 and 8. The outer ring is fitted with the planetary roller 10. When the drive pin 7 having the planetary roller 10 attached thereto is attached to the hollow shaft portion 1, the planetary roller 10 and the sleeves 8 and 8 are inserted into the insertion hole 5 in the radial direction from the outer diameter side of the hollow shaft portion 1 to the shaft neck. 7
a and 7b are inserted into the mounting grooves 6a and 6b, respectively.

Thus, the four planet rollers 10 are axially positioned in the insertion holes 5 by the sleeves 8, 8 and the deep groove ball bearings 9, 9 and are rotatably attached to the hollow shaft portion 1 so that each planet roller 10 can rotate. The outer peripheral surface of the roller 10 is partially hollow shaft 1
Slightly protrudes from the outer peripheral surface of. Therefore, the diameter of the outer peripheral surface of the hollow shaft portion 1 can be set close to the inner diameter of the ring-shaped fixed raceway surface 22 (described later).

As will be described later, the hollow shaft portion 1 of the rotating portion is rotatably supported by the planetary roller 10 and the deep groove ball bearing 11 with a seal on the fixed portion. , Deep groove ball bearing with seal on the front end side of mounting groove 6a
11 inner rings are fitted.

Further, a mounting groove 6 is formed on the outer peripheral surface of the hollow shaft portion 1.
A seal 13 having a lip is fitted between the labyrinth seal portion 12 provided on the rear end side of b and the rear end of the mounting groove 6b, and fitted on the deep groove ball bearing with seal 11 and the tip of the hollow shaft portion 1. A labyrinth seal portion 15 formed in a brim shape and a seal 16 having a lip are fitted between the cap-shaped member 14 and the cap-shaped member 14.

The deep groove ball bearing with a seal 11 has a labyrinth seal portion regarding the sealing function for the center hole 4 and the insertion hole 5.
Joined 15 and Seal 16.

An annular groove 17 is formed in the grooved collar portion 2 and engages with an exchange hand of an automatic tool changing device. The pull rod of the main shaft of the machining center is screwed into the screw hole formed in the rear end surface of the taper shank, and the taper shank is inserted into the taper hole of the main shaft.

A jacket groove 21 is formed on the outer peripheral surface of the fixed portion, a ring-shaped fixed raceway surface 22 for planetary rollers is formed on the inner peripheral surface, and a projecting edge portion 23 that is in close contact with the lip of the seal 16 is formed on the inner peripheral surface of the front end portion. At the same time, the rear end surface is in contact with the lip of the seal 13, and a through hole 25 penetrating from the jacket groove 21 toward the cutting (grinding) coolant ejection port 24 on the front end surface is formed. It is composed of a hollow housing 20 having a substantially cylindrical shape, and a jacket cover 26 covering the jacket groove 21 is sealed on an outer peripheral surface of the housing 20 with an O-ring and is fitted with an adhesive.

Further, a detent device 40 is provided on the outer peripheral surface of the hollow housing 20. The rotation stopping device 40 is slidably fitted in a guide sleeve 41 fixed to the outer peripheral surface of the hollow housing 20 in the direction of the main shaft axis, and biased rearward in the direction of the main shaft axis by a compression spring 42. The detent pin 43, the engaging hole 44 of the collar 47 attached to the hollow shaft 1 and the engaging claw arm 44 that can be engaged and disengaged are projected in the radial direction, and the guide sleeve 41 and the detent pin 43 are provided. And an adjusting sleeve 46 which is slidably fitted onto the outer circumference of the adjusting sleeve 46 and is biased rearward by the compression spring 45 in the axial direction of the main shaft.
Then, the tip of the detent pin 43 is adapted to be engaged with the fixed portion of the machining center, for example, the engaging recess of the detent member on the tip surface of the spindle head when the spindle of the taper shank 3 is inserted. ..

In the hollow housing 20 mounted on the outer periphery of the hollow shaft portion 1, the inner peripheral surface thereof has a ring-shaped fixed raceway surface.
The outer ring of the deep groove ball bearing with seal 11 is positioned and fixed at the front step portion of 22 and the outer peripheral surface of the planetary roller 10 is engaged with the ring-shaped fixed raceway surface 22, and the lip of the seal 13 is closely attached to the rear end surface. The lip of the seal 16 is in close contact with the projecting edge portion 23, and the inner peripheral surface of the distal end portion of the hollow housing 20 has a labyrinth seal portion.
Opposite 15

The tool mounting portion includes three rolling bearings (for example, angular ball bearings having ceramic balls) 31, 31,
The rotary shaft 30 is rotatably inserted into the central hole 4 of the hollow shaft portion 1 via 31. That is, with the step portion 18 formed in the central hole 4 of the hollow shaft portion 1 as the axial bearing surface,
The outer rings of the rolling bearings 31, 31, 31 are fitted and positioned in close contact with each other in the axial direction in order, and the outer peripheral surface of the rotary shaft 30 is fitted to these inner rings. That is, rotating shaft 30 (tool mounting part)
The rigidity of the hollow shaft portion 1 (rotating portion) is maintained by the rolling bearings 31, 31, 31.

A sun roller portion 32 is formed on the rotary shaft 30 projecting to the inner side of the inner rings of the rolling bearings 31, 31, 31, and the sun roller portion 32 projects from the inner opening of the insertion hole 5. It is circumscribed with the planetary roller 10. After all, the ring-shaped fixed raceway surface 22, the planetary rollers 10, ... And the sun roller portion 32 constitute a planetary roller speed-up mechanism.

The tip of the rotary shaft 30 projects from the tip hole 14a of the cap-like member 14 of the rotary section through the labyrinth seal section 19 so that a tool can be properly mounted. Then, the tongue portion of the seal 33 attached to the rotary shaft 30 is in close contact with the front surface of the cap-shaped member 14.

The operation of the tool adapter with the planetary roller speed increasing mechanism will be described. By inserting a shank of a predetermined tool into the taper hole at the tip of the rotary shaft 30, the tool is gripped by the tool adapter with the planetary roller speed-up mechanism. At that time, the engaging claw arm 44 is engaged with the positioning hole formed in the front end surface of the collar portion 47 by the spring force of the compression spring 45, and the rotating portion and the fixed portion are in a fixed relationship.

The tool adapter with the built-in planetary roller speed-up mechanism installed therein is stored in, for example, a tool magazine of a machining center, and is gripped in the annular groove 17 of the grooved collar portion 2 by an exchange hand to be attached to the spindle of the machining center. It is attached in a predetermined angular positional relationship. That is, the taper shank 3 is inserted into the taper hole of the main shaft, the pull rod of the main shaft is screwed into the screw hole of the taper shank 3, and the taper shank 3 is pulled in, whereby the tool adapter with the planetary roller speed increasing mechanism is fixed to the main shaft. It

At this time, the tip of the detent pin 43 engages with the engaging recess of the detent member on the tip surface of the spindle head, and the detent pin 43 is engaged.
Is retracted against the spring force of the compression spring 42, and the adjustment sleeve 46 abuts against the tip end surface of the rotation stopping member,
Retracting against the spring force of 45, the engaging claw arm 44 separates from the positioning hole of the collar portion 47. As a result, the fixed portion, that is, the hollow housing 20 is fixed, and the rotating portion is rotatable with respect to the fixed portion together with the main shaft.

Thus, when the spindle equipped with the tool adapter with the planetary roller speed-up mechanism is rotationally driven, the hollow shaft portion 1 supported by the sealed deep groove ball bearings 9, 9 rotates with respect to the hollow housing 20. .. Therefore, the ring-shaped fixed raceway surface 22
The planetary rollers 10 contacting with each other rotate about the drive pin 7 and revolve around the main axis. Then, the sun roller portion 32 contacting the planetary roller 10, that is, the rolling bearings 31, 3
The tool mounted on the rotary shaft 30 supported by the rotary shafts 1, 31 rotates at a higher speed than the rotation of the rotary portion, that is, the main shaft. The thrust load on the tool is the rotating shaft 30, rolling bearings 31, 31, 31
And is supported by the main shaft via the rotating part.

Cutting (grinding) is performed by a tool that rotates at a high speed. At this time, the cutting (grinding) coolant is sent from the jacket groove 21 through the through hole 25 toward the jet outlet 24, and is then processed. It is sprayed on the spot.

Thus, the penetration of cutting (grinding) coolant during machining into the tool adapter with the built-in planetary roller speed-up mechanism is blocked by the seals 13, 16, 33 during the low speed rotation, and the high speed rotation. Inside each seal 1 to prevent friction heat
Centrifugal force causes the lips of 3, 16, and 33 to bend and move away from the close contact point, but they are blocked by the labyrinth seal portions 12, 15, and 19.

[0030]

In the tool adapter incorporating the planetary roller speed-up mechanism of the present invention, the planetary roller is axially positioned through the deep groove ball bearing fitted in the inner hole thereof, and the planetary roller is positioned for positioning. It is not necessary to provide a fixed-side hollow housing that engages with both end surfaces of the roller, that is, a member on the ring-shaped fixed raceway surface side, and the hollow housing is held by the planetary roller and the deep groove ball bearing located in front of this. By doing so, the diameter of the outer peripheral surface of the hollow shaft portion can be made close to the inner diameter of the ring-shaped fixed raceway surface. That is, a hollow shaft portion having a larger diameter can be used as compared with the conventional tool adapter having the planetary roller speed increasing mechanism. Therefore, since the number of planetary rollers can be increased, the transmission torque and rigidity can be increased.

Further, there is no member on the side of the ring-shaped fixed raceway for positioning the planetary roller, and the tool mounting portion is borne by the deep groove ball bearing with respect to the rotating portion inserted into the spindle of the machine tool to maintain rigidity. Since the fixed part is supported by the planetary roller and the deep groove ball bearing on one side of the ring-shaped fixed raceway surface, the bearing on the other side is omitted. The length in the direction of the rotation axis is smaller than that of the adapter, and the size and weight can be reduced and the rigidity can be improved. Therefore,
When used by being mounted on the spindle of a machine tool, the size of the workpiece is reduced and the allowable weight of the automatic tool changer is not exceeded.

[Brief description of drawings]

FIG. 1 is a sectional front view of a tool adapter with a planetary roller speed increasing mechanism according to an embodiment of the present invention.

FIG. 2 is a perspective view of a planetary roller insertion hole and a drive pin of a tool adapter with a planetary roller speed increasing mechanism according to an embodiment of the present invention.

FIG. 3 is a partial front sectional view of a tool adapter with a planetary roller speed-up mechanism according to a conventional technique.

[Explanation of symbols]

 1 Hollow shaft 2 Groove with groove 3 Taper shank 4 Center hole 5 Insertion hole 6a, 6b Mounting groove 7a, 7b Shaft neck 7 Drive pin 8 Sleeve 9, 11 Sealed deep groove ball bearing 10 Planetary roller 12, 15, 19 Labyrinth seals 13, 16, 33 Seals 14 Cap-shaped member 14a Tip hole 17 Annular groove 18 Step 20 Hollow housing 21 Jacket groove 22 Ring-shaped fixed raceway surface 23 Protruding edge 24 Coolant jet 25 Through hole 26 Jacket cover 31 Rolling Bearing 30 Rotating shaft 32 Sun roller 40 Anti-rotation device 41 Guide sleeve 42, 45 Compression spring 43 Lock pin 44 Engaging claw arm 46 Adjusting sleeve 47 Collar

Front page continuation (72) Inventor Hitoshi Iwamoto 3-5-8 Minamisenba, Chuo-ku, Osaka Within Koyo Seiko Co., Ltd. (72) Inventor Eiichi Katayama 2-144, Amamihigashi, Matsubara-shi, Osaka

Claims (1)

[Claims] 1. A rotary part, in which a center hole in the axial direction is formed in the first half part, and the latter half part is mounted on a spindle of a machine tool,
A fixed part, which is a hollow housing that is rotatably fitted and supported by the front half of the rotary part and is engaged with and disengaged from the fixed side of the machine tool, and is inserted into the center hole of the rotary part. It is freely rotatable, is connected to the rotating part through a planetary roller speed-up mechanism, and is composed of a tool mounting part for mounting a tool at the tip part, and penetrates from the outer peripheral surface to the center hole in the first half part of the rotating part. The planetary rollers inserted into the respective radial insertion holes of the planetary rolling elements are rotatably and axially movably mounted on the drive pin attached to the hollow shaft through the deep groove ball bearings. It is positioned and mounted, and its outer peripheral surface partially protrudes slightly from the outer peripheral surface of the hollow shaft part,
Inscribed in the annular fixed raceway surface of the hollow housing, the hollow housing is rotatably supported by the hollow shaft by the planetary roller and deep groove ball bearing, and is rotatably inserted in the center hole of the hollow shaft through the rolling bearing. A tool adapter with a planetary roller speed-up mechanism, in which the sun roller portion formed on the tool mounting portion is in external contact with the planetary roller protruding from the inner opening of the insertion hole.