JP5627134B2 - Pallet with shaft end support mechanism - Google Patents

Description

  The present invention relates to a pallet including a shaft end support mechanism that supports a shaft end.

For example, a belt-type continuously variable transmission mechanism includes a driving pulley, a driven pulley, and a belt that runs around these pulleys. Various assembly operations such as attaching a belt with a driving pulley and a driven pulley standing and attaching a bearing and a cover occur.
In such an assembly operation, particularly in a mixed production line, a pallet having a shaft end support mechanism for supporting the shaft end is useful.

  A shaft end support mechanism that supports the shaft end or a chuck mechanism that grips the shaft end has been put to practical use using hydraulic pressure as a drive source (see, for example, Patent Document 1 (FIGS. 1 and 3)).

  As shown in FIG. 1 of Patent Document 1, a spindle (17) is set up on the headstock (1) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter). A claw arm (20) is rotatably attached to the shaft (17), and a chuck claw (18) having a cam surface (22) is integrally provided at the tip of the claw arm (20). A ring (6) is rotatably provided on the headstock (1), and an opening / closing pin (10) is erected on the ring (6), and the opening / closing pin (10) is engaged with the base of the claw arm (20). Match. The ring (6) is rotated by a hydraulic cylinder (11).

  As shown in FIG. 3 of Patent Document 1, the cam surface (22) changes in small increments until the radius of curvature is L0 to Ln (where L0 <Ln). Even if the outer diameter of the shaft end that is the object to be grasped changes from 2Rn to 2R0, it can be reliably supported.

  This type of shaft end support mechanism is used for a head stock (1) of a machine tool. In a machine tool, cutting or grinding is performed while rotating a shaft-like workpiece at a relatively high speed. Since the reaction force by the blade is large, the force to support the workpiece is increased to prevent the workpiece from idling. For this purpose, a powerful hydraulic cylinder (11) is used, and the hydraulic cylinder (11) continues to be urged during gripping.

Since the gripping force is large, the shaft end may be damaged. Further, since the hydraulic pressure is continuously supplied, electric energy supplied to the hydraulic pump increases.
On the other hand, the assembly work does not require as much gripping force as a machine tool. In addition, it is desirable to prevent electric energy from increasing during gripping.

  That is, there is a demand for a shaft end support mechanism that does not cause the shaft end to be damaged and does not require electrical energy during gripping.

JP-A-5-261606

  SUMMARY OF THE INVENTION An object of the present invention is to provide a shaft end support mechanism that does not cause any damage to the shaft end and does not require electrical energy during gripping.

The invention according to claim 1 is a pallet including a shaft end support mechanism that supports a shaft member.
The shaft end support mechanism is
A fixing ring fixed to the lower member;
A drive ring that is rotatably fitted to the fixed ring;
Turning means for turning the drive ring;
A support pin provided on the fixing ring;
A plurality of rotating cams rotatably mounted on the support pins and having cam grooves;
A drive pin provided in the drive ring and fitted in the cam groove to rotate the rotating cam;
A friction plate fitted between the fixing ring and the drive ring;
Ri Do an elastic body and for generating one of said friction plate provided to press the other of the drive ring and the fixed ring frictional force of the fixed ring and the drive ring,
The lower member is a floating member that is movably supported via a rail on the base plate and a biasing member that biases the lower member with respect to the rail in a direction away from the rail. A contact portion that bypasses the rail and contacts the base plate when compressed is provided .

  The invention according to claim 2 is characterized in that the fixing ring is fixed to the lower member by a plurality of bolts, and these bolts penetrate the friction plate.

  The invention according to claim 3 is characterized in that the lower member is movably supported on the base plate via a rail.

In the invention which concerns on Claim 4 , in a pallet provided with the shaft end support mechanism which supports a shaft member,
The shaft end support mechanism is
A fixing ring fixed to the lower member;
A drive ring that is rotatably fitted to the fixed ring;
Turning means for turning the drive ring;
A support pin provided on the fixing ring;
A plurality of rotating cams rotatably mounted on the support pins and having cam grooves;
A drive pin provided in the drive ring and fitted in the cam groove to rotate the rotating cam;
A friction plate fitted between the fixing ring and the drive ring;
An elastic body provided on one of the fixed ring and the drive ring and pressing the friction plate against the other of the fixed ring and the drive ring to generate a frictional force;
The friction plate includes an internal thread portion that is screw-coupled to an external thread provided in a jig that passes between a plurality of rotating cams.

In the invention which concerns on Claim 5 , in a pallet provided with the shaft end support mechanism which supports a shaft member,
The shaft end support mechanism is
A fixing ring fixed to the lower member;
A drive ring that is rotatably fitted to the fixed ring;
Turning means for turning the drive ring;
A support pin provided on the fixing ring;
A plurality of rotating cams rotatably mounted on the support pins and having cam grooves;
A drive pin provided in the drive ring and fitted in the cam groove to rotate the rotating cam;
A friction plate fitted between the fixing ring and the drive ring;
An elastic body provided on one of the fixed ring and the drive ring and pressing the friction plate against the other of the fixed ring and the drive ring to generate a frictional force;
A bearing is provided between the support pin and the rotating cam, and a bearing is provided between the cam groove and the drive pin.

The invention according to claim 6 is characterized in that the elastic body is a coil spring.

The invention according to claim 7 is characterized in that the urging member is a disc spring.

In the invention which concerns on Claim 1, a shaft end is supported by rotating a some rotating cam. The rotating cam can be rotated by a handle or an air cylinder. If the handle or air cylinder is used, the axial force is much smaller than that of a hydraulic cylinder, so there is no fear of scratching the shaft end.
Further, the grip state is maintained by the friction plate and the elastic body. There is no need to keep pushing the rotating cam with a hydraulic cylinder or air cylinder. As a result, electric energy is not necessary.
In addition, the lower member is a floating member that is movably supported via the biasing member, and includes a contact portion that bypasses the rail and contacts the base plate when the biasing member is compressed. .
When an axial force is applied, such as fitting a bearing on the shaft, a load is applied to the rail.In the present invention, the load is applied to the rail by bringing the contact portion into contact with the base plate before the load is applied to the rail. A significant reduction was made. As a result, a rail having a ball spline mechanism can be adopted and the ball spline mechanism can be downsized.

In the invention according to claim 2, the fixing ring is fixed to the lower member by a plurality of bolts, and these bolts penetrate the friction plate.
It is necessary to prevent the friction plate from rotating with the drive ring. In the present invention, the friction plate is prevented from rotating by the bolt. There is no need to provide a separate detent mechanism.

In the invention which concerns on Claim 3, the lower member is supported by the base plate so that movement is possible via a rail.
It is suitable for assembling a belt type continuously variable transmission mechanism in which the distance between the shafts changes.

In the invention which concerns on Claim 4 , a shaft end is supported by rotating a some rotating cam. The rotating cam can be rotated by a handle or an air cylinder. If the handle or air cylinder is used, the axial force is much smaller than that of a hydraulic cylinder, so there is no fear of scratching the shaft end.
Further, the grip state is maintained by the friction plate and the elastic body. There is no need to keep pushing the rotating cam with a hydraulic cylinder or air cylinder. As a result, electric energy is not necessary.
In addition, the friction plate includes a female screw portion that is screw-coupled to a male screw provided in a jig passing between the plurality of rotating cams. When the drive ring does not rotate due to sticking or the like, a countermeasure can be taken by forcibly moving the friction plate in the axial direction with a jig.

In the invention which concerns on Claim 5 , a shaft end is supported by rotating a some rotating cam. The rotating cam can be rotated by a handle or an air cylinder. If the handle or air cylinder is used, the axial force is much smaller than that of a hydraulic cylinder, so there is no fear of scratching the shaft end.
Further, the grip state is maintained by the friction plate and the elastic body. There is no need to keep pushing the rotating cam with a hydraulic cylinder or air cylinder. As a result, electric energy is not necessary.
Is provided. The frictional force between the support pin and the rotating cam and between the cam groove and the drive pin can be reduced and wear can be suppressed.

In the invention according to claim 6 , the elastic body is a coil spring. Since the coil spring is inexpensive, it contributes to cost reduction of the pallet.

In the invention according to claim 7 , the biasing member is a disc spring. The disc spring has a significantly smaller axial dimension than the coil spring. The recessed portion for storing the disc spring can be made shallow, and the pallet can be made compact.

It is a top view of a pallet provided with the shaft end support mechanism concerning the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a disassembled perspective view of a fixing ring and a friction plate. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is operation | movement explanatory drawing of a shaft end support mechanism. It is a figure which shows the example which applied the pallet which concerns on this invention to the belt-type continuously variable transmission mechanism. It is a top view which shows the example of a change of the pallet which concerns on this invention. FIG. 9 is a sectional view taken along line 9-9 in FIG. 8.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

As shown in FIG. 1, the shaft end support mechanism 20 in the pallet 10 (hereinafter simply referred to as the pallet 10) having a shaft end support mechanism for supporting the shaft member is the most important part.
The shaft end support mechanism 20 includes a fixed ring 21, a drive ring 22 disposed so as to surround the fixed ring 21, a rotating means 23 that rotates the drive ring 22, and a support pin 24 provided on the fixed ring 21. A plurality of (three in this example) rotary cams 25 that are rotatably supported by the support pins 24 and a drive pin 27 that stands on the drive ring 22 and fits into a cam groove 26 provided in the rotary cam 25. The main element.

The cam groove 26 may be an oval groove provided in the rotating cam 25 in addition to a notch groove in which one end of an oval is opened as shown.
Further, the rotating means 23 may be an air cylinder in addition to the handle.

  As shown in FIG. 2, which is a sectional view taken along line 2-2 of FIG. 1, the fixing ring 21 is fixed to the lower member 30 with bolts (preferably hexagon socket head cap bolts 29, 29).

  As shown in FIG. 3, the fixing ring 21 includes a ring portion 21a and cylindrical leg portions 21b and 21b that descend from the ring portion 21a, and hexagon socket bolts 29 and 29 are passed through the leg portions 21b and 21b. The A ring-shaped friction plate 31 is disposed under the fixing ring 21. The friction plate 31 is provided with a hole 32 through which the leg portion 21b passes, and an internal thread portion 33 is provided on the inner peripheral surface. The hexagon socket head bolt 29 may be directly passed through the hole 23 without the leg 21b.

  As shown in FIG. 4, which is an enlarged view of the main part of FIG. 2, a first collar 34, 34 and a distance collar 35 for determining the axial position of the first bearing 34, 34 are provided between the support pin 24 and the rotary cam 25. It is desirable to intervene. Since the support pin 24 is a non-rotating member and the rotating cam 25 is a rotating member, the rotating cam 25 can be lightly rotated by interposing the first bearings 34 and 34.

  Further, it is desirable that the inner ring 37 of the second bearing 36 is fitted to the drive pin 27 and the outer ring 38 is brought into contact with the cam groove 26. Since the drive pin 27 is also a non-rotating member and the rotating cam 25 is a rotating member, wear in the cam groove 26 can be prevented by interposing the second bearing 36.

As shown in FIG. 5, which is a sectional view taken along line 5-5 in FIG. 1, the driving ring 22 is provided with a receiving surface 22 a that receives the friction plate 31. The fixing ring 21 is provided with recessed spring storage portions 21c and 21c that open downward, and the elastic bodies 39 and 39 are stored in the spring storage portions 21c and 21c. These elastic bodies 39, 39 urge the friction plate 31 downward. A frictional force is generated by urging the friction plate 31 downward with the fixing ring 21 as a reference and pressing the friction plate 31 against the receiving surfaces 22a and 22a. This friction force is proportional to the product of the urging force of the elastic body 39 and the friction coefficient of the friction plate 31.
As a result, the drive ring 22 is always braked with a frictional force.

By the way, it is necessary to take measures to prevent the friction plate 31 from rotating around the drive ring 22.
As described in FIG. 3, the rotation of the friction plate 31 is prevented by the legs 21b and 21b. Therefore, there is no worry that the friction plate 31 rotates.

Next, the operation of the shaft end support mechanism 20 having the above configuration will be described.
In FIG. 6A, the diameter D1 of the inscribed circle 41 of the rotary cams 25, 25, 25 is sufficiently large. When the rotating means 23 is pushed counterclockwise in the drawing, the rotating cam 25 is rotated about the support pin 24 by the drive pin 27 in the counterclockwise direction in the drawing.
As a result, as shown in FIG. 6B, the diameter D2 of the inscribed circle 41 of the rotary cams 25, 25, 25 is sufficiently small. At least a shaft or a workpiece having a shaft end with a diameter in the range of the diameter D2 to the diameter D1 can be gripped.

By the way, since the drive ring 22 is rotated by the rotating means 23 or the air cylinder, the rotational force is small. If at least one of the friction plate 31 and the receiving surface 22a shown in FIG. 5 is wet with oil or water, the friction plate 31 may stick to the receiving surfaces 22a and 22a. This sticking also occurs for other reasons.
Then, the drive ring 22 does not rotate, and it is necessary to disassemble and clean the assembly work. This adversely affects productivity.

  As a countermeasure, as shown in FIG. 2, an internal thread portion 33 is provided on the friction plate 31. A jig 42 with a male screw 42 a indicated by an imaginary line is inserted from above, and the male screw 42 a is screwed into the female screw portion 33. Next, the jig 42 is pulled up. Then, the friction plate 31 is separated from the receiving surface 22a. This eliminates the sticking phenomenon so that assembly work can be continued. Next, disassembly and cleaning are performed during the rest period, and production can be continued with a simple treatment using the jig 42.

The pallet 10 of the present invention is suitable for an assembly process of a belt type continuously variable transmission mechanism. An example of the application will be described next.
As shown in FIG. 7, the driving pulley 51 (or the driven pulley 52) is gripped by the shaft end support mechanism 20, and the driven pulley 52 (or the driving pulley 51) is gripped by the second shaft end support mechanism 45. . In this state, the belt 53 is hung.
The belt-type continuously variable transmission mechanism 50 having such a structure differs in the shaft diameter D3 and the inter-shaft distance L for each model. A pallet 10B that can accommodate a plurality of sizes is desired.

Therefore, as shown in FIG. 8, the pallet 10 </ b> B includes a lower member 30 having a shaft end support mechanism 20, a base plate 46 disposed below the lower member 30, and a lower member 30 that is laid on the base plate 46 and is movable. Rails 47 and 47, and a second shaft end support mechanism 45 provided on the base plate 46.
The rails 47 and 47 allow the shaft end support mechanism 20 to contact and separate from the second shaft end support mechanism 45, and the distance L can be changed.

  As shown in FIG. 9, two rails 47, 47 are laid on the base plate 46, and sliders 49, 49 are placed on these rails 47 via rollers 48, 48. Bolts are mounted on these sliders 49, 49. At 61, an intermediate plate 62 is attached. The intermediate plate 62 is also a member that holds the columns 63 and 63. These struts 63, 63 extend upward and are loosely connected to the lower member 30. A biasing member 64 that biases the lower member 30 upward from the intermediate plate 62 as a starting point is provided in the vicinity of the column 63.

The biasing member 64 employs a disc spring. If it is a disc spring, it is cheap, easy to obtain, and has a small axial dimension. In this example, a plurality of disc springs were fitted to the support 63 in a stacked form. If it is a disc spring, since the support | pillar 63 can be penetrated in a hole, the accommodation of a disc spring will improve and there is no fear that a disc spring will remove | deviate.
Since the elements mounted on the lower member 30 have been described, the reference numerals are used to omit the description.

  The lower member 30 has rails 47, 47, that is, cylindrical contact portions 30a that extend downward around the sliders 49, 49. A stopper member 65 extending in the direction of the front and back of the drawing is disposed below the contact portion 30a, and is fixed to the base plate 46 with bolts 66 and 66.

  When no downward force is applied to the lower member 30, the biasing action of the biasing member 64 opens a gap δ between the stopper member 65 and the contact portion 30a. In this state, when the lower member 30 is pushed to the back of the drawing, the sliders 49 and 49 move on the rails 47 and 47, so that they move lightly. The lower member 30 is called a floating member because it is floated by the biasing member 64.

  It is necessary to keep the lower member 30 stationary after the movement. In this case, the brake may be applied using the brake means 67 built in the slider 49. The brake means 67 includes, for example, a brake piece 68 that contacts the side surface of the rail 47 and an air cylinder 69 that moves the brake piece 68 forward and backward.

When a downward force of a certain level or more is applied to the lower member 30, the urging member 64 is compressed, and as a result, the contact portion 30 a contacts the stopper member 65. Although the reaction force of the urging member 64 is transmitted to the intermediate plate 62, since the lower member 30 does not directly contact the intermediate plate 62, the force applied to the slider 49, the roller 48, and the rail 47 is small g.
That is, even if an operation such as fitting a bearing to the shaft is performed, the slider 49, the roller 48, and the rail 47 are not significantly affected. Since the load is small, the roller 48 can be reduced in diameter, and the rail 47 and the slider 49 can also be reduced.

  The height dimension H of the pallet 10B can be reduced by reducing the size of the rail 47 and the slider 49, adopting a disc spring as the urging member 64, and adopting the plate-like rotating cam 25. .

  Although the pallets 10 and 10B of the present invention are suitable for the assembly work of the belt type continuously variable transmission mechanism, for example, the pallets 10 and 10B can be used for assembling a gear type transmission mechanism and other shafts, so that the usage is arbitrary. is there.

  The pallet of the present invention is suitable for assembly work of a belt type continuously variable transmission mechanism.

  DESCRIPTION OF SYMBOLS 10, 10B ... Pallet (pallet) provided with shaft end support mechanism, 20 ... Shaft end support mechanism, 21 ... Fixed ring, 22 ... Drive ring, 23 ... Rotating means, 24 ... Support pin, 25 ... Rotating cam, 26 ... Cam groove, 27 ... drive pin, 29 ... bolt (hexagon socket head cap screw), 30 ... lower member, 30a ... contact portion, 31 ... friction plate, 33 ... female screw portion, 34,36 ... bearing, 39 ... elastic body, 42 ... Jig, 42a ... Male screw, 46 ... Base plate, 47 ... Rail, 50 ... Belt-type continuously variable transmission mechanism, 51 ... Shaft member (drive pulley), 64 ... Biasing member.

Claims (7)

In a pallet including a shaft end support mechanism for supporting a shaft member,
The shaft end support mechanism is
A fixing ring fixed to the lower member;
A drive ring that is rotatably fitted to the fixed ring;
Turning means for turning the drive ring;
A support pin provided on the fixing ring;
A plurality of rotating cams rotatably mounted on the support pins and having cam grooves;
A drive pin provided in the drive ring and fitted in the cam groove to rotate the rotating cam;
A friction plate fitted between the fixing ring and the drive ring;
Ri Do an elastic body and for generating one of said friction plate provided to press the other of the drive ring and the fixed ring frictional force of the fixed ring and the drive ring,
The lower member is a floating member that is movably supported via a rail on the base plate and a biasing member that biases the lower member with respect to the rail in a direction away from the rail. A pallet comprising a shaft end support mechanism, comprising a contact portion that bypasses the rail and contacts the base plate when compressed .   The pallet having a shaft end support mechanism according to claim 1, wherein the fixing ring is fixed to the lower member by a plurality of bolts, and the bolts penetrate the friction plate.   The pallet having a shaft end support mechanism according to claim 1, wherein the lower member is movably supported by a base plate via a rail. In a pallet including a shaft end support mechanism for supporting a shaft member,
The shaft end support mechanism is
A fixing ring fixed to the lower member;
A drive ring that is rotatably fitted to the fixed ring;
Turning means for turning the drive ring;
A support pin provided on the fixing ring;
A plurality of rotating cams rotatably mounted on the support pins and having cam grooves;
A drive pin provided in the drive ring and fitted in the cam groove to rotate the rotating cam;
A friction plate fitted between the fixing ring and the drive ring;
An elastic body provided on one of the fixed ring and the drive ring and pressing the friction plate against the other of the fixed ring and the drive ring to generate a frictional force;
Said friction plate pallet with a shaft end supporting mechanism you characterized by comprising a female thread is screwed to a male screw provided on the jig passing between said plurality of rotating cams. In a pallet including a shaft end support mechanism for supporting a shaft member,
The shaft end support mechanism is
A fixing ring fixed to the lower member;
A drive ring that is rotatably fitted to the fixed ring;
Turning means for turning the drive ring;
A support pin provided on the fixing ring;
A plurality of rotating cams rotatably mounted on the support pins and having cam grooves;
A drive pin provided in the drive ring and fitted in the cam groove to rotate the rotating cam;
A friction plate fitted between the fixing ring and the drive ring;
An elastic body provided on one of the fixed ring and the drive ring and pressing the friction plate against the other of the fixed ring and the drive ring to generate a frictional force;
The support pins and bearing provided between the rotary cam, the pallet comprising a shaft end supporting mechanism you characterized in that the bearing is provided between the cam groove and the drive pin.   The pallet having a shaft end support mechanism according to claim 1, wherein the elastic body is a coil spring. Said biasing member is a pallet with a shaft end supporting mechanism according to claim 1, characterized in that it is a disc spring.

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