JPH094647A - Flexible coupling - Google Patents

Abstract

PURPOSE: To restrain the generation of oscillation effectively by dividing a block engaging piece into two parts radially to form inner and outer divided parts, integrally coupling an outer surface of the inner divided part and an inner surface of the outer divided part by a coupling part of very small area, and making the front cross sectional shape of the block engaging piece a U shape or an I shape. CONSTITUTION: A ring coupling member 17 is formed by integrally fixing a plurality of a block engaging pieces 23 at equal space in an outer periphery edge of a cyclic supporting band 22 and respective block engaging pieces 23 are fit in an assembling space of the block engaging pieces. The block engaging pieces 23 are divided into two radically to subdivide into inner and outer divided parts 23a, 23b and also an outer surface of the inner divided part 23a and an inner surface of the outer divided part 23b are integrally coupled by a coupling part 23c of very small area and the front cross sectional shape of the block engaging piece is made a U shape or an I shape. Whereby, inner stress caused in a flexible coupling T and oscillation amount proportional to the stress may be extremely reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a power transmission system for transmitting power.
The present invention relates to a flexible joint used to connect rotating shafts.

[0002]

2. Description of the Related Art The applicant of the present invention has previously proposed in JP-B-57-38816 a flexible joint having a structure in which rotating shafts having end faces facing each other and having the same axial direction are connected under a permissible eccentric amount. Disclosed.

As shown in FIGS. 5 to 8, such a flexible joint 50 has rotary shafts 51, 52 having shaft holes 53, 54 around the joint.
Flange body 55,56 and both flange bodies 55,56 fixed to
Is formed by an annular connecting member 57 that integrally connects the two flange members 55 and 56 with annular engaging grooves 58 and 59 that are concentric with the rotating shafts 51 and 52 and are formed on the opposing end surfaces of the flange members 55 and 56. Partitioning claws 60, 61 extending in the axial direction from the flange body end face are fixed in the grooves 58, 59 at equal circumferential intervals, and the one side partitioning claw 60 or 61 is mutually opposite the two other side partitioning claws 61, 61 or 60, 60 intervals, thereby partitioning the connector mounting space into the required number of mass engagement mounting spaces,
On the other hand, the annular coupling body 57 is configured by fixing a plurality of massive engaging pieces 63 to the annular supporting bands 62, 62a at equal circumferential intervals, and the same massive engaging pieces 63 are arranged in the massive engaging piece mounting space. Further, the block-shaped engaging piece 63 is divided into inner and outer divided portions 63a and 63b in the radial direction by a circumferential division line 64.

As described above, since the block-like engaging piece 63 is divided into two in the radial direction, as compared with the case where the block-like engaging piece 63 is integrally formed, as shown in the following formula, both flanges are formed. It is possible to reduce the internal stress generated by the eccentricity of both shafts 51 and 52 in the annular connecting body 57 made of a flexible material that connects the bodies 55 and 56 to 1/4 and significantly reduce the vibration amount of the flexible joint 50. It can be reduced.

That is, as shown in FIGS. 9 and 10, it is assumed that the two shafts 51, 52 connected by the flexible joint 50 are eccentric by an eccentricity α (in the drawings, R is both flange bodies). The radii of 55 and 56 and O ₁ and O ₂ are their centers of rotation.)

On the other hand, O ₁ (FIG. 9) is the center of the drive shaft, and O ₂ (FIG. 1)
0) is the center of the driven shaft, and the partition claws 60 of the two couplings are
If the eccentricity of 61 is α and it rotates in the direction of the arrow, 1 /
Each two rotations must be moved in the radial direction by α, and a flexible elastic block-like engaging piece 63 is interposed to enable this movement. The friction coefficient of the contact surfaces of the partition claw 60 of the flange body 55, the partition claw 61 of the flange body 56, and the block engagement piece 63 is quite large, and a large frictional force due to the rotational force acts in the radial direction, while the block engagement piece is Since 63 is flexible, the contact surface does not slip even if there is eccentricity of α, and if the partitioning claw 60 side is the fixed end, the partitioning claw 61 side is a swinging end with respect to the partitioning claw 60 side, and the block shape is large. As shown in FIG. 10, the engagement piece 63 can be regarded as a cantilever beam that is fixed at one end and receives a load at its free end, and the eccentricity α corresponds to the amount of deflection δ.

In general, the amount of deflection δ in such a beam
And the load W (which is proportional to the internal stress) are as follows: W = (3 × δ × E × I) / L ³ .

Here, W = load applied to the beam, δ = deflection amount, E = elastic coefficient, I = moment of inertia, L = length of the beam.

Here, when the eccentricity α (deflection δ) is kept constant, the load applied to the massive engagement piece 63 is as follows.

(A) When the block-shaped engaging piece 63 is integral as shown in FIG. 10 (note that h is height and b is width in the figure),
Since the moment of inertia I ₁ is I ₁ = 1 / 12bh ³ from FIG. 11 (a) (b), W ₁ = (3 × δ × E × I) / L ³ = {(3 × δ × E) /
L ³ × {(1/12) bh ³ }.

(B) On the other hand, when the lumped engaging piece 63 is divided into two as shown in FIGS. 5 to 8, if the moment of inertia of each piece is obtained, then from FIG. 12 (a) (b), I ₂ = Since the 1/12 bh ³ lump engaging piece 63 is divided into the inner and outer divided portions 63a and 63b, 2I ₂ = 1/12 b (h / 2) ³ × 2 W ₂ = (3 × δ × E × 2I ₂ ) / L ³ = {(3 × δ ×
E) / L ³ } × {(1/12) b (1/4) h ³ } (c) From this, W ₁ / W ₂ = I ₁ / 2I ₂ = 4, which corresponds to the load W on the beam The internal stress generated in the block-shaped engaging piece 63 can be greatly reduced by dividing the block-shaped engaging piece 63 into two parts, and the occurrence of vibration can be suppressed.

However, in the flexible joint 50 described above,
As shown in FIGS. 5 to 8, the block-shaped engaging pieces 63 are respectively
Since the outer peripheral portion 63a and the inner peripheral portion 63b are completely divided into two in the radial direction, the work of mounting the annular connecting body 57 on both the flange bodies 55 and 56 is complicated.

Therefore, the applicant of the present invention, as shown in FIGS. 13 and 14, cuts the central portion of the block-shaped engaging piece 63 in the width direction to provide a narrow and horizontally long slit S, and the slit S is provided above and below the slit S. The positioned inner and outer peripheral portions 63a, 63b are integrally connected to each other via the left and right connecting portions 63c, 63d forming both sides of the slit S, and the block-shaped connecting body 63 is provided with a block-shaped connecting body 57 having a closed loop shape. The flexible joint 50 was developed.

In the flexible joint 50, the annular connecting body 57 can be easily attached to both the flange bodies 55 and 56, while the sectional shape thereof is the same as that of the annular connecting body 57 shown in FIGS. As shown in FIG. 12 (b), the moment of inertia I ₃ is also small, 2I ₃ = 1/12 b (h / 2) ³ × 2, and vibration can be suppressed in the same manner. it is conceivable that.

[0015]

[Problems to be Solved by the Invention] However, the flexible joint 50
The eccentric action of the two flange bodies 55, 56 of the
Not only is it deformed in the circumferential direction as shown in FIG.
In order to deform as much as possible in the axial direction as shown in (4) and suppress the vibration caused by this deformation as much as possible, it is desirable that the cross section orthogonal to the axial direction is also divided into two.

In this respect, FIG. 16 (a-1) (b-1), especially FIG. 16 (b-1)
As is clear from FIG. 5, the flexible joint 50 shown in FIGS.
Is completely divided into two, so
And the load W can be applied as they are, and the inertia moment I ₄ can be reduced to effectively suppress the occurrence of vibration.

However, as will be described below, in the flexible joint 50 shown in FIGS. 13 and 14, the moment of inertia I ₅ with respect to the axial direction is remarkably increased, and the flexible joint 50 is substantially of the integral type described with reference to FIG. The moment of inertia is almost the same as that of the annular connecting body 63, the internal stress increases, and there is still a problem in terms of preventing vibration.

That is, in FIGS. 16 (a-2) and 16 (b-2), assuming that the width and length of the slit S are c and L ₀ , respectively, the moment of inertia I ₅ is I ₅ = 1/12 ( Lh ³ −L ₀ c ³ ).

However, since the width c of the slit S is relatively small, the above equation is I ₅ = 1/12 (Lh ³ −L ₀ c ³ ) ≈1 /
It becomes 12Lh ³ .

As described above, the moment of inertia I ₅ becomes extremely large, so that vibration still occurs in the flexible joint 50.

An object of the present invention is to provide a flexible joint which can solve the above-mentioned problems.

[0022]

SUMMARY OF THE INVENTION The present invention is a flexible joint for connecting a pair of rotary shafts, whose end faces face each other and having the same axial direction, under a permissible eccentricity amount. A flange body fixed to both rotary shafts having a hole and an annular coupling body integrally coupling both flange bodies,
An annular engaging groove that is concentric with both rotary shafts is bored in the facing end faces of both flange bodies, and partition claws that extend in the axial direction from the flange body end face are fixed in both annular engaging grooves at equal circumferential intervals. Then, each of the one side partitioning claws is extended between two other side partitioning claws, thereby partitioning the connecting body mounting space into a required number of massive engaging mounting spaces, while the annular connecting body is divided into a plurality of annular supporting bands. In a flexible joint in which the block-shaped engaging pieces are fixed to each other at equal circumferential intervals, and the block-shaped engaging pieces are arranged in the block-engaging-piece mounting space, the block-shaped engaging pieces are divided into two in the radial direction, and the inside is divided. And the outer divided portion, and the outer surface of the inner divided portion and the inner surface of the outer divided portion are integrally connected by a connecting portion having a small area, and the front cross-sectional shape of the massive engaging piece is formed into a U shape or an I shape. The present invention relates to a flexible joint characterized by the above.

[0023]

Embodiments of the flexible joint T according to the present invention will be specifically described below with reference to the embodiments shown in the accompanying drawings.

As shown in FIGS. 1 to 3, the flexible joint T
Is a flexible joint capable of connecting, under eccentricity, rotating shafts 11 and 12 having end faces facing each other and having the same axial direction.

As shown in the figure, the flexible joint T has shaft holes 13 and 14 at its center and has flange bodies 15 and 15 and both flange bodies 15 and 16 fixed to the rotary shafts 11 and 12. It is composed of an annular connecting body 17 that is integrally connected.

Further, annular engaging grooves 18 and 19 which are concentric with the rotary shafts 11 and 12 are bored in the end faces of the flanges 15 and 16 facing each other, and are connected in the annular engaging grooves 18 and 19. It forms a body attachment space.

Partitioning claws 20 and 21 extending in the axial direction from the end face of the flange body are fixed to the respective annular engaging grooves 18 and 19 at equal intervals, and the one side partitioning claw 20 or 21 respectively has two other claws. By extending between the side partitioning claws 21, 21 or 20, 20, the connecting body mounting space is partitioned into a required number of massive engaging piece mounting spaces.

Further, the annular coupling body is constituted by integrally fixing a plurality of massive engaging pieces 23 to the outer peripheral edge of the annular supporting band 22 at equal intervals, and engaging the massive engaging pieces 23 in a massive manner. It is fitted in the one-sided mounting space.

In the structure of the flexible joint T described above, according to the present invention, as shown in FIGS. 1 to 3, the block-like engaging piece 23 is radially divided into two and divided into inner and outer divided portions 23a and 23b. At the same time, the outer surface of the inner divided portion 23a and the inner surface of the outer divided portion 23b are integrally connected by a connecting portion 23c having a small area, and the front sectional shape of the massive engaging piece 23 is U-shaped or I-shaped. It has characteristics.

With this structure, as shown in the following equation, the internal stress generated in the flexible joint T and the vibration amount proportional to the stress can be significantly reduced.

That is, in FIGS. 14 (a-3) and (b-3), if the width and the length in the cross section of the connecting portion 23c of the block-shaped engaging piece 23 in the direction orthogonal to the axial direction are c and d, respectively, the _{I 6 = 1 / 12L × (} h / 2) 3 × 2 + 1 / 12d × c 3 = 1 / 12L × h 3/4 + 1/12 dc 3.

[0032] Here, c, d since both a small value, and _{I 6 = 1 / 12L × h} 3/4 + 1/12 dc 3 ≒ 1 / 12L × h 3/4.

[0033] Thus, in the present invention, the moment of inertia I _6, moment of inertia I ₄ when the bulk engagement piece 23 of the annular connecting body 17 completely divided into two annular, as shown in FIGS. 5 to 8 Can be significantly reduced as well.

Further, in this embodiment, the outer surface of the inner divided portion 23a and the inner surface of the outer divided portion 23b are connected to each other by a connecting portion 23c having a small area.
Are integrally connected with each other, and the cross-sectional shape of the massive engagement piece 23 is U-shaped or I-shaped.
The installation work of 15,16 can be performed extremely easily and surely.

In this embodiment, the connecting portion 23c having a small area is used.
In the embodiment shown in FIGS. 1 to 3, is provided at the center of one end of the block-shaped engaging piece 23 in the axial direction, and the cross-sectional shape of the block-shaped engaging piece 23 is U-shaped as shown in FIG. However, the connecting portion 23c may be provided at another location, for example, as shown in FIG. 4, it may be provided at the center of the central portion in the axial direction. The cross-sectional shape of 23 is I-shaped.

In the above construction, the material of the annular connecting member 17 is preferably synthetic rubber, natural rubber or other material having appropriate flexibility, and the flange members 15, 16
Is preferably made of metal, hard plastic, or the like.

[0037]

As described above, in the flexible joint according to the present invention, when the one-side rotating shaft is rotated, the rotating torque is transmitted through the flange body, the partition claw, the block-shaped engaging piece, the partition claw, and the flange body. Transmitted to the rotating shaft. At this time, even if the rotating shaft and the rotating shaft are eccentric with a constant eccentric amount as described above, the block-like engaging piece having the two-divided structure including the inner and outer divided portions has a unitary structure. Since the internal stress is about 1/4 (theoretically), the internal stress that causes vibration can be greatly reduced. In addition, the block-like engaging pieces also provide a sufficient cushioning effect.

Furthermore, since the outer surface of the inner divided portion and the inner surface of the outer divided portion are integrally connected by a connecting portion having a minute area, the front sectional shape of the massive engaging piece is U-shaped or I-shaped. ,
It is possible to extremely easily and surely perform the work of mounting the annular connecting body on both the flange bodies fixed to both the rotating shafts.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a flexible joint according to the present invention.

FIG. 2 is a front view of an annular connector used in the flexible joint.

3 is a sectional side view taken along the line I-I of FIG.

FIG. 4 is a perspective view of a massive connecting piece of the annular connecting body.

FIG. 5 is a front sectional view of a conventional flexible joint.

6 is a cross-sectional view taken along the line II-II of FIG.

FIG. 7 is an exploded sectional view of the same.

FIG. 8 is a side view of the same.

FIG. 9 is an explanatory view showing an eccentric state in the flexible joint.

FIG. 10 is an explanatory view showing an eccentric state in the flexible joint.

FIG. 11 is a schematic diagram for calculating the moment of inertia of the block-shaped engaging piece.

FIG. 12 is a schematic diagram for calculating a moment of inertia of a block-shaped engaging piece.

FIG. 13 is a front view of an annular connecting body in a conventional flexible joint.

FIG. 14 is a sectional side view of the flexible joint.

FIG. 15 is a schematic view showing deformation of the block-shaped engaging piece in the axial direction.

FIG. 16 is a schematic diagram for calculating a moment of inertia of a block-shaped engaging piece.

[Explanation of symbols]

 T Flexible joint 11 Rotating shaft 12 Rotating shaft 13 Shaft hole 14 Shaft hole 15 Flange body 16 Flange body 17 Annular connecting body 18 Annular engaging groove 19 Annular engaging groove 20 Partitioning claw 21 Partitioning claw 22 Annular support band 23 Bulky engaging piece 23a Inner division 23b Outer division 23c Connection

[Procedure amendment]

[Submission date] October 4, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

That is, in FIGS. 16 (a-3) and 16 (b-3), the width and the length in the cross section in the direction orthogonal to the axial direction of the connecting portion 23c of the block-like engaging piece 23 (see FIG. 2) are respectively c , When d, the _{I 6 = 1 / 12L × (} h / 2) 3 × 2 + 1 / 12d × c 3 = 1 / 12L × h 3/4 + 1/12 dc 3.

Claims (1)

[Claims] 1. A flexible joint for connecting rotating shafts (11) and (12) having end faces facing each other and having the same axial direction under a permissible eccentricity, and a shaft hole (13 ) (14) and a flange body (15) (16) fixed to the rotary shafts (11) and (12) and an annular coupling body (1) integrally coupling both flange bodies (15) and (16)
7), the annular engaging grooves (18) and (19) that are concentric with the rotary shafts (11) and (12) are bored on the opposing end faces of the flange bodies (15) and (16), and Partitioning claws (20) (21) extending in the axial direction from the end face of the flange body are fixed in the mating grooves (18) (19) at equal circumferential intervals, and the one side partitioning claw (20) or (21) is mutually attached. Two other compartment claws (21) (2
1) or (20) (20) is extended to partition the connecting body mounting space into a required number of mass engagement mounting spaces, while a plurality of annular connecting bodies (17) are formed on the annular supporting band (22). In the flexible joint in which the block-shaped engaging pieces (23) are fixed to each other at equal circumferential intervals, and the block-shaped engaging pieces (23) are arranged in the block-engaging piece mounting space, the block-shaped engaging pieces (23 ) Is divided into two parts in the radial direction into inner and outer divided parts (23a) and (23b), and the outer surface of the inner divided part (23a) and the inner surface of the outer divided part (23b) are connected to each other with a small area (2
A flexible joint characterized in that the block-shaped engaging piece (23) is integrally connected by 3c) and the front sectional shape of the block-like engaging piece (23) is U-shaped or I-shaped.