JP2762055B2 - Groove ball bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to suitable grooved ball bearing with a goniometer or the like of the optical science machine, for example.

[0002]

2. Description of the Related Art In general, bearings are used as mechanical parts for supporting a shaft which rotates while receiving a load. Among them, a grooved ball bearing used for a shaft in which a load is applied in parallel to an axis is an arc-shaped ball bearing. One set with a pair of curved guide grooves
And a plurality of steel balls disposed between the guide grooves of the respective races are widely known.

FIG. 10 to FIG. 13 show a conventional ball bearing with grooves, which will be described.

In the drawing, reference numeral 1 denotes a grooved ball bearing. As shown in FIG. 11, the grooved ball bearing 1 has a pair of races 2 and 2 having the same diameter, and A substantially V-shaped or U-shaped guide groove 3, 3 formed in an annular shape on the opposing surface 2A and a radius r of a radius r provided between the guide grooves 3, 3 of each of the races 2 are provided. Steel balls 4, 4, ... (for example, 8
) And engaging holes 5A, 5A for holding the respective steel balls 4.
.. (For example, eight). The races 2, 2 are formed in an annular shape having a radius L, and the cross-section of each guide groove 3 is an inclined surface 3A,
In general, it is formed in a V or U shape having an opening angle θA (θA = 90 °) by 3B.

As shown in FIG. 12, each of the guide grooves 3 is provided, for example, with respect to one steel ball 4 with respect to the center O of the steel ball 4.
Assuming coordinates (O, O) as origins, among the two points where the groove center C (O, L) of the races 2 and 2 and the guide groove 3 of each raceway 2 and the steel ball 4 contact, The contact P0 (a
0, b0) and the contact P0 '(-a0, b0), and the outside is the contact Q0 (A0, -B0) and the contact Q0' (-A0, -B0).
When the angle between the inclined surface 3A having the contacts P0 and P0 'and the x-axis is an angle θB0, and the angle between the inclined surface 3B having the contacts Q0 and Q0' and the x-axis is an angle θC0, θB0
= ΘC0 = 45 °, the coordinates in the x-axis and y-axis directions are equal, and the following equation 1 holds.

[0006]

(Equation 1)

Then, a straight line P0P0 'and a straight line Q0Q0'
Have equal length dimensions.

Further, in the grooved ball bearing 1 according to the prior art, one of the races 2 is fixed, the other race 2 is free, and the other race 2 is temporarily moved in the direction of arrow A in FIG. 12, the steel ball 4 rotates in the direction indicated by the arrow B in FIG. 12 around the Y axis as the center of rotation. Thereby, the friction between the races 2 can be reduced and the races 2 can be rotated.

[0009]

By the way, in the above-mentioned grooved ball bearing 1 according to the prior art, when the movement of the steel ball 4 on the bearing ring 2 is observed, the steel ball 4 is guided along the guide groove 3. Groove 3
In contact with the contact points P0 , P0 ' and the contact points Q0 , Q0' , they are revolving and revolving.
As shown in FIG. 13, the orbit PR0 by the contacts P0 and P0 'and the orbit QR0 by the contacts Q0 and Q0' are formed. The radius of the orbit PR0 is (L−
b0), the radius of the orbit QR0 is (L + B0) ,
Since the radius is (L−b0) <(L + B0), the moving distance LPR when the steel ball 4 makes one revolution on the orbit PR0.
0 and the movement distance LQR when making one revolution on the orbit QR0
The relationship with 0 is LPR0 <LQR0.

On the other hand, when the contact portion between the steel ball 4 and the guide groove 3 is viewed, the steel ball 4 becomes Y as shown in the direction of arrow B in FIG.
The contacts P0 , P0 ' and the contacts Q0 , Q
Since 0 'is rotating in a contact state, a rotation path PS0 where the contact point P0 moves and a rotation path QS0 where the contact point Q0 moves are formed on the steel ball 4. Then, the radius of the rotation trajectory PS0 is a0, the radius of the rotation trajectory QS0 is A0, and the radius is a0 = A0 from Equation 1. Therefore, the apparent contact points P0 and P0 ′ with respect to the rotation of the steel ball 4 are changed to the rotation trajectory PS.
The rotation distance LPS0 when making one round on 0 , and the contact points Q0 ,
The rotation distance L when Q0 'makes one revolution on the rotation orbit QS0
The relationship with QS0 is LPS0 = LQS0.

Here, the relationship between the rotation and the revolution is that the steel ball 4 moves along the revolution trajectory PS0 to make one revolution on the revolution trajectory PR0 at the contact point P0 because the revolution trajectory moves on the revolution trajectory.
Is rotated m times, LPR0 = LPS0 × m, and if the steel ball 4 rotates n times along the rotation trajectory QS0 to make one revolution on the revolution trajectory QR0 at the contact point Q0, LQ
R0 = LQS0 × n. Then, the moving distance by the revolution is LPR0 <LQR0, and the rotation distance by the rotation is L
Since PS0 = LQS0, m <n. But,
Since m and n are rotations of the same steel ball 4, actually m = n, and slippage occurs at one of the positions of the contacts P0 and P0 'or the positions of the contacts Q0 and Q0'. Will be.

On the other hand, considering the circumferential speed of the steel ball 4, when the rotation speed of the steel ball 4 in the direction of arrow B is V 0, and the bearing ring 2 is rotated in the direction of arrow A, From the rotation, the contact point P0 ,
The peripheral speed to be transmitted to the steel ball 4 via P0 'is VP0,
When the peripheral speed to try to convey the steel ball 4 via the contact Q0, Q0 'and Vq0, the moving distance of the orbit PR0, QR0 the LPR0 <because the relation of LQR0, a radius equal rotation trajectory PS0, QS0 The peripheral speed that tries to work against is V
P0 <VQ0.

The contacts P0 , P0 ' and the contacts Q0 , Q
When the torque applied to the steel ball 4 from 0 ′ strongly acts on the contacts P0 and P0 ′ located radially inward, the rotation peripheral speed V0 of the steel ball 4 is the peripheral speed that is transmitted from the contact P0 to the steel ball 4. VP0
It should rotate in line with. Accordingly, the peripheral speed VQ0 to try to convey from the outside of the contact Q0 to the steel ball 4, since the moving distance of the orbit PR0, QR0 has become LPR0 <LQR0, faster than the rotation peripheral speed V0 of the steel balls 4 It becomes.
Accordingly, at the position of the contact point Q0, the moving speed of the guide groove 3 is higher than that of the rotation of the steel ball 4, and the sliding occurs at the contact point Q0.

On the other hand, when the rotation peripheral speed V0 of the steel ball 4 coincides with the peripheral speed VQ0 to be transmitted from the contact point Q0 to the steel ball 4, the peripheral speed VP0 at the contact point P0 becomes lower than the rotational peripheral speed V0. The guide groove 3 has a lower moving speed than the steel ball 4 rotates, and a slip occurs at the contact point P0.

As a result, uneven wear occurs on the steel balls 4 at the positions of the contacts Q0 and Q0 'or the positions of the contacts P0 and P0'. There is a problem that the movement of the bearing 1 is made heavy and, consequently, the grooved ball bearing 1 is broken down.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention provides a method of rotating a steel ball in a guide groove of a raceway curved in an arc shape without slipping and thereby rotating the steel ball easily. An object of the present invention is to provide a grooved ball bearing capable of preventing uneven wear.

[0017]

Grooved ball bearing according to the present invention, in order to solve the problem] is to have a guide groove curved in an arc shape, as one set of a pair
It is composed of a bearing ring to be used, and a plurality of steel balls disposed between the guide grooves of each bearing ring.

Then, in order to solve the above-mentioned problem,
The feature of the configuration adopted by the invention of claim 1 is that the center of the ball of the steel ball is O, the center of the groove of the guide groove is C, and the inner contact between the guide groove of each of the races and the steel ball is P, P ', the outside contact points are also Q and Q', the straight line connecting the ball center O of the steel ball and the groove center C of the guide groove is OC, and the straight line connecting the contact points P and P 'inside the guide groove is PP. When the straight line connecting the outer contact points Q and Q 'is QQ', the shape of the guide groove is such that the straight line PP 'and the straight line QQ' are orthogonal to the straight line OC, and the length dimension is the straight line PP '. <A straight line QQ 'is formed so that one of the pair of races is placed on the base side.
And the other bearing ring is displaced at an angle to the base.
On the stage side .

According to the second aspect of the present invention, C is the center of the guide groove, P and P 'are the inner contacts where the guide grooves of the respective race rings are in contact with the steel balls, and Q and Q are the outer contacts. ′, The shape of the guide groove is changed to the groove center C, the contact point P, and the contact point Q.
Is connected to the groove center C, the contact point P ' and the contact point Q'.
And straight lines CP'Q 'are formed so as to be substantially aligned with each other, and one of the pair of races is
Attach it to the base side, and change the angle of the other raceway with respect to the base.
Has been attached to the stage to be moved.

According to the third aspect of the present invention, the base is a gonio stay.
The stage is angled on the base.
Gonio stage tilt stage
It has been constituted by .

[0021]

According to the first aspect of the present invention, the center of the steel ball is O and the guide groove is
The center of the groove is C, the inner contact point where the guide groove of each of the races contacts the steel ball is P, and the outer contact point is Q, and the shape of the guide groove is the length of the straight line PP ′ and the straight line QQ ′. Is formed such that the straight line PP '<the straight line QQ', the distance of movement of the steel ball at the contact point P when revolving on the guide groove is L.
Revolution orbit PR to be PR, one revolution on steel ball is rotation distance LP
A rotation trajectory PS is formed as S, and a revolution trajectory QR in which the movement distance when the steel ball orbits on the guide groove is LQR is formed at the contact point Q, and a rotation trajectory QS is formed on the steel ball such that one revolution is the rotation distance LQS. Since the steel ball revolves around the orbit PR at the contact point P along the orbit PS and revolves along the orbit QR at the contact point Q while revolving along the orbit QS, the LP at the contact point P = LPS × m, LQR at contact point Q
= LQS × n (where m and n are the rotation speeds), since the straight line PP ′ <the straight line QQ ′, LPR / LPS ≒
LQR / LQS, and m ≒ n. This allows
The peripheral speed from the bearing ring which is to be transmitted to the steel ball via the contact points P and Q can be made substantially equal, and since this peripheral speed becomes the rotation peripheral speed, the contact speed between the steel ball and the guide groove at the contact point P and Q is reduced. Since slip can be reduced , one of the bearing rings is attached to the base side,
Stage that displaces the angle of the other bearing ring with respect to the base
The stage is mounted smoothly on the side.
Can be tilted.

According to the second aspect of the present invention, the shape of the guide groove of the race ring is defined by a line CPQ connecting the groove center C, the contact point P and the contact point Q, and a line CP 'connecting the groove center C, the contact point P' and the contact point Q '. Q 'is
Since they were formed so that they were almost aligned in a straight line,
The steel ball that revolves while rotating , between the and the guide groove,
At the contact point P, a revolving orbit PR having one revolution on the guide groove and a revolution orbit PS having one revolution LPS on the steel ball is formed at the contact groove, and at the contact Q one revolution on the guide groove is moved on the guide groove. orbit QR as the LQR, rotation trajectory QS is Ru is formed to one round on the steel ball is rotation distance LQS. So ,
Steel ball, rotation orbit on orbit PR in contact P PS
, And at the contact point Q , the orbit Q
Since it moves at S, the moving distance at the contact point P is LPR = LP
S × m , and the movement distance at the contact point Q is LQR = LQS ×
n (where m and n are rotation speeds) . And the groove center C
A line CPQ connecting contact point P and the contact Q and the groove center C and contact point
Since the line CP'Q 'connecting the point P' and the contact point Q 'is substantially on a straight line, LPR / LPS = LQR / LQS.
And m ≒ n. Thereby, the peripheral speed from the bearing ring to be transmitted to the steel ball via the contact points P and Q can be made substantially equal, and since this peripheral speed becomes the rotation peripheral speed, the contact points P and Can you eliminate the slip in Q
One of the rings is attached to the base, and the other is
Configuration to be mounted on the stage side that displaces the angle to the table
By doing so, the stage can be tilted smoothly
it can.

According to the third aspect of the present invention, the pair is a pair.
By mounting one bearing ring on the base side and mounting the other bearing ring on the stage side that displaces the angle with respect to the base, the grooved ball bearing can be used for a gonio stage. It can prevent uneven wear and slippage of the steel ball.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIG.
This will be described with reference to FIG. In the embodiments, the same components as those of the above-described conventional technology are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a first embodiment according to the present invention.

[0026] In the figure, 11 indicates a grooved ball bearing according to the present embodiment, ball bearing 11 with the groove has a V-shaped guide grooves 13, 13 curved in ring shape respectively, facing surfaces 12A, 12
A is a pair of bearing rings 12 facing each other, and a guide groove 13 formed in each of the bearing rings 12.
, Steel balls of radius r provided to engage with
(E.g., eight) and engagement holes 5A for holding the respective steel balls 4,
(E.g., eight) 5A,... (E.g., eight).
The second guide groove 13 is formed as described later.

Here, the guide groove 13 of the bearing ring 12 is formed, for example, with respect to one steel ball 4, by the ball center O (O, O) of the steel ball 4.
Is considered as coordinates with the origin as the origin, the groove center C (O, L) of the race 12 and one of the races 12
Contact point P1 (a1, b1) on the inside and contact Q1 (A1, -B) on the outside.
1), the two points in contact with the guide groove 13 of the other race 12 are the same as the one at the contact point P1 '(-a1, b
1) and contact Q1 '(-A1, -B1), the straight line P
1P1 'and the straight line Q1Q1' are orthogonal to the straight line CO, the length dimension thereof is P1P1 '<Q1Q1', and the line CP1Q1 connecting the groove center C with the contact point P1 and the contact point Q1.
And a line CP connecting the groove center C, the contact point P1 ' and the contact point Q1'
1'Q1 'and, since you positioned on a straight line respectively, the guide groove 13 so that the number 2 below is established is formed in this embodiment.

[0028]

(Equation 2)

The shape of the guide groove 13 in the present embodiment is determined by the angle θB between the inclined surface 13A having the contact point P1 and the x-axis.
1 is 45 degrees, and the angle θC1 between the inclined surface 13B having the contact point Q1 and the x-axis is set by the following equation (3).

[0030]

Equation 3 θC1 = tan ⁻¹ (A1 / B1)

First, Equation 2 will be considered. here,
The contact existing in the y-axis symmetry with the contact P1 (a1, b1) is denoted by P
1 ′ (−a1, b1), and the contact Q1 (A1, −B1)
Q1 contacts present in the y-axis symmetry and '(- A1, -B1)
Then, the triangles P1P1'C and Q1Q1'C have a similar relationship because the two corresponding angles are equal.

Therefore, the ratio between the side P1P1 'and the side Q1Q1' (ie, 2a1: 2A1 = a1: A1) is equal to the ratio of the perpendiculars (ie, L-b1: L + B1), so that the above equation 2 is established.

Further, when the bearing ring 12 is rotated around the groove center C, a moving distance LPR1 by <br/> orbit P R1 of contact P 1 where the steel ball 4 comes into contact with the guide groove 13, the contact Q1
The moving distance LQR1 based on the orbit QR1 is as follows .

[0034]

(Equation 4)

Further, when the steel ball 4 is rotating as a rotation around the y axis, the rotation distance LPS1 by rotation trajectory P S1 of contact P 1 formed on the steel ball 4, rotation trajectory of the contact point Q1
The rotation distance LQS1 by QS1 is as follows .

[0036]

(Equation 5)

At the contact points P1 and Q1, the steel ball 4 revolves while rotating on the orbit.
Assuming that the steel ball 4 rotates m times along the rotation trajectory PS1 to make one revolution on R1, and the steel ball 4 rotates n times along the rotation trajectory QS1 to make one revolution on the revolution trajectory QR1. Equation 6 is obtained.

[0038]

(Equation 6)

Then, Equations (4) and (5) are substituted into Equation (6).
Calculate m and n.

[0040]

(Equation 7)

Then, by comparing Equations 7 and 2, m = n.

Accordingly, if the steel ball 4 rotates on the orbits PR1 and QR1 by m (n) times, it is possible to make one revolution, and at this time, the slip at the contact points P1 and Q1 can be eliminated.

On the other hand, considering the peripheral speed on the steel ball 4, when the rotation peripheral speed of the steel ball 4 is set to V1 and the bearing ring 12 is rotated in the direction of arrow A in FIG. VPL is the peripheral speed to be transmitted to the steel ball 4 via the contact point P1 from the rotation by
The peripheral speed to be transmitted to the steel ball 4 via the contact Q1 is VQ1
Then, the moving distance LP of the orbit PR R1 at the contact point P1
R1 and the movement distance LQR of the orbit QR1 at the contact point Q1
The relationship between the 1, become a LPR1 <LQR1, the ratio is that Do and (L-b1 / L + B1 ). Also, at the contact point P1
The rotation distance LPS1 of the rotation orbit PS1 and the rotation at the contact point Q1
The relationship between the rotation path QS1 and the rotation distance LQS1 is LPS1 <
LQS1 and the ratio is (a1 / A1).

Further, the torque to be transmitted to the steel ball 4 via the contact points P1 and Q1 strongly acts on the contact P1 side located in the radial direction, so that the rotation peripheral speed V1 of the steel ball 4 is increased from the contact point P1 to the steel ball. 4 to rotate to coincide with the peripheral speed VP1 to be transmitted to the motor.

The radius of the orbits PR1 and QR1 is L
−b1 <L + B1) The radius of the rotation orbits PS1 and QS1 is a
1 <A1, triangle P1P1'C and triangle Q1Q
1′C, the ratio of each side is (L−b
1 / L + B1) = (a1 / A1), and the peripheral speed VQ1 transmitting from the contact point Q1 to the steel ball 4, the peripheral speed VP1 transmitting from the contact point P1 to the steel ball 4, and the rotation speed V1 are equal. Become. Thereby, slippage at the contacts Q1 , P1 can be reliably prevented.

As a result, the contact Q1 or the contact P
1 prevents uneven wear at the position 1 and prevents rattling or displacement between the guide grooves 3 of each race 12, reduces the movement of the grooved ball bearing 11, and effectively extends the life of the bearing 11. Can be extended.

In this embodiment, the guide groove 1 of the race 12 is
By setting one angle θB1 to 45 ° and setting the other angle θC1 as shown in Equation 3, the guide groove 13 satisfying Equation 2 can be easily formed.

Next, FIG. 2 shows a second embodiment of the present invention. The feature of this embodiment is that the guide groove is formed into a V-shaped groove so that the guide groove can be easily processed. Is one angle θB2 = t, where the angle θA2 of the apex angle is 90 °.
an ⁻¹ (a2 / b2), and the other angle θC2 = 90
゜ −tan ⁻¹ (a2 / b2). In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 21 denotes a grooved ball bearing according to the present embodiment. The grooved ball bearing 21 has a V-shaped annularly curved shape substantially similar to the grooved ball bearing 11 according to the first embodiment. Guide groove 2
3 and 23, each of which has an opposing surface 22 </ b> A that is provided so as to be engaged with a guide groove 23 formed in each of the races 22, 22 that are used as a pair in a pair facing each other. , And a retainer 5 having engagement holes 5A, 5A,... For holding the steel balls 4, the features of the present embodiment. is the shape of the guide groove 23 of each bearing ring 22, lies in the formed as described below.

Here, the guide groove 23 of the bearing ring 22 is formed, for example, with respect to one steel ball 4 by the ball center O (O, O) of the steel ball 4.
, The point at which the groove center C (O, L) of the bearing ring 22 and the guide groove 23 of each bearing ring 22 and the steel ball 4 are in contact, that is, the inside is the contact point P2 (a2, b2). And a contact P2 '(-a2, b2), and a contact Q2 (A2, -B
2) and the contact Q2 '(-A2, -B2), the groove
A line CP2Q2 connecting the center C, the contact point P2 and the contact point Q2, and a groove;
A line CP2'Q connecting the center C, the contact point P2 'and the contact point Q2'
2 'are located on a straight line, so that in the present embodiment also, the expression 2 in the first embodiment described above is satisfied.

The shape of the guide groove 23 according to this embodiment is such that the angle between the inclined surface 23A having the contact point P2 and the x-axis is θB2, and the angle between the inclined surface 23B having the contact point Q2 and the x-axis is θC2. This angle is set by the following equation (8).

[0052]

(Equation 8)

By setting the angles θB2 and θC2 and forming the guide groove 23 in this manner, the angle θ of the guide groove 23
A2 can be 90 °.

Thus, also in the grooved ball bearing 21 configured as described above, similarly to the first embodiment, the peripheral speed V2 of the steel ball 4 at the contact points P2 and Q2 and the revolving orbit P
The circumferential speed V P2 to be Tsutawaro to R2 or al steel balls 4, revolving trajectories
The peripheral speed VQ2 to be transmitted from the road QR2 to the steel ball 4 can be made equal to each other, so that slippage at the contacts P2 and Q2 can be eliminated and uneven wear can be reliably prevented. As a result,
The life of the grooved ball bearing 21 can be effectively extended.

FIG. 3 shows a third embodiment according to the present invention. The feature of this embodiment is that the shape of the guide groove formed in the race is formed as a recess having a step. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a grooved ball bearing according to the present embodiment. The grooved ball bearing 31 has an annularly curved cross section substantially in the same manner as the grooved ball bearing 11 according to the first embodiment. Races 32, 32 each having a pair of guide grooves 33, 33, and having a pair of opposed surfaces 32A facing each other.
, Steel balls 4, 4,... Having a radius r provided so as to be engaged with the guide grooves 33 formed in the respective races 32, and engagement holes 5A, 5A, Retainer 5 having ...
Although roughly configured from the above, the features of this embodiment are:
The shape of the guide groove 33 of each bearing ring 32, lies in the formed as described below.

Here, the guide groove 33 of the bearing ring 32 is formed in a concave shape having steps 33A and 33B. For example, for one steel ball 4, the center of the steel ball 4 is set to the ball center O (O, O). When considered as coordinates, the groove center C (O,
L), the point where the guide groove 33 of each raceway ring 32 and the steel ball 4 are in contact, that is, the inside is the contact point P3 (a3, b3) and the contact point P3 '.
(-A3, b3), outside contact Q3 (A3, -B3) and
When the contact Q3 '(-A3, -B3) is set, the groove center C
CP3Q3 connecting the contact point P3 and the contact point Q3, and the groove center C
And a line CP3'Q3 'connecting the contact point P3' and the contact point Q3 '
Are located on a straight line, therefore, in the present embodiment, Equation 2 in the above-described first embodiment is satisfied, and in this embodiment, the step 33A contacts the contact point P3, and the step 33B contacts the contact Q3. It comes into contact.

Thus, also in the grooved ball bearing 31 configured as described above, the peripheral speed V3 of the steel ball 4 at the contact points P3 and Q3 and the revolving orbit P
The peripheral speed VP3 to be Tsutawaro to R3 or al steel balls 4, revolving trajectories
It is possible to make the peripheral speed VQ3 to be transmitted from the road QR3 to the steel ball 4 equal, to eliminate slip at the contacts P3 and Q3, and to surely prevent uneven wear. As a result, the life of the grooved ball bearing 31 can be effectively extended.

FIG. 4 shows a fourth embodiment according to the present invention. The feature of this embodiment is that the shape of the guide groove formed in the bearing ring is formed in a weak elliptical shape. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 41 denotes a grooved ball bearing according to the present embodiment. The grooved ball bearing 41 is substantially U-shaped in cross section which is annularly curved in substantially the same manner as the grooved ball bearing 11 according to the first embodiment. has Jo of the guide grooves 43 and 43 respectively, the bearing ring is used as a pair a pair of opposed surfaces 42A are opposed to each other 42, 42
, Steel balls 4, 4,... Having a radius r provided so as to be engaged with guide grooves 43 formed in the respective races 42, and engagement holes 5A, 5A, Retainer 5 having ...
Although roughly configured from the above, the features of this embodiment are:
The shape of the guide groove 43 of each bearing ring 42, lies in the formed as described below.

Here, the guide groove 43 of the raceway ring 42 is formed to have a weak elliptical cross section. For example, one steel ball 4 is defined as coordinates with the sphere center O (O, O) of the steel ball 4 as the origin. Considering the groove center C (O, L) of the race 42, each race 42
The contact point between the guide groove 43 and the steel ball 4, i.e., the contact P4 (a4, b4) and contact P4 '(-a4, b4) on the inside, and the contact Q4 (A4, -B4) and contact Q4' ( -A4
−B4), the groove center C, the contact point P4, and the contact point Q4
CP4Q4, groove center C, contact point P4 'and contact point Q
The lines CP4 'and Q4' connecting 4 'are respectively aligned on a straight line.
Therefore , in the present embodiment, Equation 2 in the first embodiment described above is satisfied.

Thus, also in the grooved ball bearing 41 configured as described above, the peripheral speed V4 of the steel ball 4 at the contact points P4 and Q4 and the orbit P
The peripheral speed VP4 to be Tsutawaro to R4 or al steel balls 4, revolving trajectories
The peripheral speed VQ4 that is transmitted from the road QR4 to the steel ball 4 can be made equal, the slip at the contacts P4 and Q4 can be eliminated, and uneven wear can be reliably prevented. As a result, the life of the grooved ball bearing 41 can be effectively extended.

Next, FIGS. 5 to 9 show a fifth embodiment of the present invention.
This embodiment is characterized in that the above-described grooved ball bearing is used for an automatic goniometer. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 51 denotes an automatic goniometer stage.
The gonio stage 51 includes a base 52, a stage 54 rotatably mounted on the base 52 via grooved ball bearings 53, 53, and an electric motor 55 for rotating the stage 54. It is configured.

As shown in FIG. 9, each of the grooved ball bearings 53 has an arc-shaped orbital ring 56 used as a pair and guides formed on each of the orbital rings 56, respectively. A plurality of, for example, seven steel balls 59, 59,... Provided via a retainer 58 located between the groove 57 and each guide groove 57 and shorter than the length of the race 56; , Which are provided at both ends of the screw, and which prevent the screws from being removed. In the grooved ball bearing 53, one of the races 56, 56 facing each other is fixed to the base 52, and the other is fixed to the stage 54. Further, the shape of the guide groove 57 of the grooved ball bearing 53 is formed in the same manner as the grooved ball bearing 11 described in the first embodiment, so as to prevent wear at the contact point.

[0066] goniometer stage 5 1 constituted in this way
By driving the electric motor 55, the stage in the arrow c direction to the groove center C of the bearing ring 56 shown in FIG. 7 5
4 is rotated and the stage 54 is tilted . At this time, each steel ball 59 in the grooved bearing 53, bearing ring 56
Without slipping relative can Rukoto is revolved while self <br/> rolling at a portion in contact with the guide groove 57. Thereby, the steel ball 5
9 can be prevented from shifting between the stage 54 and the base 52, and the steel ball 59 and the retainer 58 of the gonio stage 51 can be prevented.
The stage 54 relative to the base 52
Can be inclined. As a result, the life of the grooved bearing 56 can be effectively extended, and
51 can be improved in reliability.

Note that the grooved ball bearing 11 according to each of the above embodiments is used.
(21, 31, 41), together with the length dimension is a relation of the straight line PP '<linear QQ', and a groove center C and contact point P contacting
Line CPQ connecting point Q, groove center C, contact point P 'and contact point Q'
Line CP'Q connecting 'but as has formed the draft <br/> groove so as to line up in a straight line, the shape of the guide groove according to the present invention is not limited thereto, linear PP'<linearly QQ ', And a line CPQ connecting the groove center C, the contact point P and the contact point Q, and a groove center C and the contact point P'
What is necessary is just to form so that the line | wire CP'Q 'which connects the contact point Q' may each be substantially in line, and even in this state, uneven wear and slippage can be reduced.

[0068]

As has been described above in detail, according to the present invention of claim 1, the center of the steel ball O, and groove-centric guiding groove C, the and the guide grooves and the steel balls of the bearing ring contacting P,
P 'and the outer contact points are Q and Q', and the shape of the guide groove is formed such that the relationship between the straight line PP 'and the straight line QQ' is a straight line PP '<a straight line QQ'. A revolution trajectory PR whose one lap is the movement distance LPR, a rotation trajectory PS whose one lap is the rotation distance LPS are formed on the steel ball,
At the contact point Q, a revolving orbit QR with one revolution being the movement distance LQR on the guide groove and a revolving orbit QS with one revolution being the rotation distance LQS on the steel ball are formed. It revolves while revolving along the PS and revolves on the revolving orbit QR at the contact point Q while revolving along the revolving orbit QS. Therefore, LPR = LPS × m at the contact point P and LQR at the contact point Q
= LQS × n (where m and n are rotation speeds), the straight line PP ′ <the straight line QQ ′, so that LPR / LPS
≒ LQR / LQS, and m ≒ n.

As a result, the peripheral speed from the bearing ring to be transmitted to the steel ball via the contact point P is substantially equal to the peripheral speed from the bearing ring to be transmitted to the steel ball via the contact point Q. Since this peripheral speed becomes the rotation peripheral speed, slip at the contact points P and Q between the steel ball and the guide groove can be reduced, uneven wear due to this can be surely reduced, and the life of the bearing can be extended, One of the bearing rings can be mounted on the base side because reliability can be improved.
To move the other bearing ring at an angle with respect to the base.
Stage can be tilted smoothly by attaching to the stage
Can be done.

According to the second aspect of the present invention, the shape of the guide groove of the bearing ring is defined by the line CPQ connecting the groove center C , the contact point P and the contact point Q, and the groove.
A line CP'Q 'connecting the center C, the contact P' and the contact Q, '
However, since they were formed so as to be substantially in line with each other ,
Since the steel ball revolves around the guide groove while rotating, the contact point P
Then, the orbit P where one round is the moving distance LPR on the guide groove
R, orbit PS with one revolution on the steel ball as the rotation distance LPS
Is formed, and at the contact point Q, one round is moved on the guide groove by the moving distance LQ.
Revolving orbit QR which is R, one revolution on steel ball is rotation distance LQS
Is formed at the contact point P.
R moves on the rotation orbit PS on R and at the contact point Q the orbit QR
Since it moves on the rotation orbit QS above, at the contact point P, LPR =
LPS × m, LQR = LQS × n at contact point Q (however,
where m and n are rotation speeds), the groove center C, the contact point P and the contact point Q
, A groove center C, a contact point P ′ and a contact point Q, ′.
Since the connecting lines CP'Q 'are substantially on straight lines , LPR / LPS = LQR / LQS, and m ≒ n
Becomes

As a result, the peripheral speeds from the races to be transmitted to the steel balls via the contact points P and Q can be made substantially equal, and since the peripheral speeds become the rotation peripheral speeds, the steel balls and the guide grooves are rotated. Can be eliminated at the contact points P and Q, the life of the bearing can be extended, and the reliability can be improved. Therefore , one race is mounted on the base and the other race is mounted.
Attached to the stage where the wheel is displaced in angle with respect to the base
The stage can be tilted smoothly
Wear.

In the invention according to claim 3, the base is a gonio stay.
The stage is inclined to the gonio stage.
Since the oblique stage is configured, the grooved ball bearing can be used for the gonio stage. As described above, uneven wear of the steel ball can be prevented, and the life of the ball bearing can be extended. Can be enhanced.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a race, a guide groove, a retainer, and a steel ball of a grooved ball bearing according to a first embodiment.

FIG. 2 is an enlarged sectional view showing a race, a guide groove, a retainer and a steel ball of a grooved ball bearing according to a second embodiment.

FIG. 3 is an enlarged sectional view showing a bearing ring, a guide groove, a retainer, and a steel ball of a grooved ball bearing according to a third embodiment.

FIG. 4 is an enlarged sectional view showing a race, a guide groove, a retainer, and a steel ball of a grooved ball bearing according to a fourth embodiment.

FIG. 5 is a perspective view showing an automatic goniostage using a grooved ball bearing according to a fifth embodiment.

FIG. 6 is a plan view showing an automatic gonio stage.

FIG. 7 is a front view showing an automatic gonio stage.

FIG. 8 is a perspective view showing a grooved ball bearing used in an automatic goniometer stage.

FIG. 9 is an exploded perspective view showing a grooved ball bearing used for the automatic gonio stage.

FIG. 10 is a perspective view showing a grooved ball bearing according to the related art.

FIG. 11 is an exploded perspective view showing a grooved ball bearing.

FIG. 12 is an enlarged sectional view showing a raceway, a guide groove, a retainer, and a steel ball of a grooved ball bearing according to the related art.

FIG. 13 is a plan view of the bearing ring as viewed from the facing surface side.

[Explanation of symbols]

4,59 steel ball 11,21,31,41,53 grooved ball bearing 12,22,32,42,56 orbital ring 13,23,33,43,57 guide groove 51 automatic goniometer stage 52 base 54 stage

Claims (3)

(57) [Claims] [Claim 1] have a guide groove curved in an arc shape, a pair
In a grooved ball bearing composed of a bearing ring used as one set and a plurality of steel balls disposed between the guide grooves of the respective bearing rings, the ball center of the steel ball is O, the groove of the guide groove is O. C is the center, P is the inner contact point where the guide groove of each of the races contacts the steel ball,
P ', the outside contact points are also Q and Q', the straight line connecting the ball center O of the steel ball and the groove center C of the guide groove is OC, and the straight line connecting the contact points P and P 'inside the guide groove is PP. When the straight line connecting the outer contact points Q and Q 'is QQ', the shape of the guide groove is such that the straight line PP 'and the straight line QQ' are orthogonal to the straight line OC, and the length dimension is the straight line PP '. <A straight line QQ ′ is formed so as to have a relationship, and one of the pair of races is
Attach the bearing ring to the base, and attach the other bearing ring to the base.
A ball bearing with a groove, which is mounted on the stage side whose angle is displaced . 2. A have a guide groove curved in an arc shape, a pair
In a grooved ball bearing comprising a raceway used as one set and a plurality of steel balls disposed between the guide grooves of each raceway, the groove center of the guide groove is C, and each raceway ring is C. P the inner contact and the guide groove and the steel ball contacts of, when the P ', also outside the contacts Q, Q', the shape of the guide groove, the groove center C and contact point P and the contact point Q A connecting line CPQ and a straight line CP'Q 'connecting the groove center C, the contact point P', and the contact point Q 'are respectively
The pair of races are formed so as to be substantially aligned with each other.
One of the rings is attached to the base, and the other
A grooved ball bearing, wherein the ball bearing is mounted on a stage side whose angle is displaced with respect to a base . 3. The base as a base for a gonio stage.
The stage is mounted on the base so as to be angularly displaceable.
The grooved ball bearing according to claim 1 or 2, wherein the ball bearing is configured as a tilted gonio stage .