JP2001108054A - Priority differential mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a priority differential mechanism that outputs one output for two inputs in a general power transmission mechanism and selectively outputs a power on the input side to the output side according to an input priority difference. SOLUTION: An output member 3 for selectively transmitting a first or second power input according to a priority difference is disposed between a first input member 1 connected to a first power and a second input member 2 connected to a second power. The output member 3 has restrict pins 14, 15 on its upside and restrict pins 16, 17 on its downside, the restrict pins 14, 15 engage with long holes 4e, 4f in a first intermediate member 4, the restrict pins 16, 17 engage with long holes 5e, 5f in a second intermediate member 5, and the first intermediate member 4 and the second intermediate member 5 are constrained to the output member 3 with the long holes such that movement right and left by δ L is allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential mechanism of one output for two inputs of a general power transmission mechanism, which selectively outputs power on an input side to an output side in accordance with a priority difference between inputs.

[0002]

2. Description of the Related Art Conventionally, a differential mechanism generally includes a planetary differential mechanism having one output member in which a planet contacting an input member corresponding to two satellites is fixed, and a difference between two input speeds is reduced by half.
It is a mechanism to transmit to the output side by lowering to the following output speed, and it was impossible to transmit to the output side at the same speed as either input speed according to the priority.

[0003]

As an application example of the differential mechanism, in an interchangeable lens of an AF single-lens reflex camera, a differential output between a dynamic input by a motor for automatic focus adjustment and a manual input for manual adjustment is provided. Focus adjustment power has been commercialized, but if one of the inputs is stationary, the output speed for focus adjustment will generally be less than one half. The amount of movement of the ring is different from the amount of movement of the focus adjustment ring.
When the other input is operated during one input operation, the focus adjustment operation may be confused. In order to avoid these, according to the priority of the initial operation on the input side, it is selectively transmitted to the output side, and when the speed ratio between the input and the output is 1 to 1, and there is a reverse input to one input while the other is operating Is not accepted, and if the input is in the same direction, when the priority input speed is exceeded,
There was a need for a preferential differential mechanism that switches to the rear input side.

[0004]

According to the present invention, in order to solve such a problem, an intermediate member in contact with two input members is provided on each of the input members, and a relative force generated between the intermediate members due to a dynamic input applied to the input portion. Misalignment was triggered for priority selection.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The main construction is that two sliding surfaces of a first input member and a second input member are opposed to each other, and a first intermediate member and a second intermediate member are respectively installed between the input members. The intermediate member is equipped with a mechanism that can capture the sliding surface of each input or switch the sliding, select the dynamic input by the relative position shift δL between the intermediate members caused by the input applied to the two input members, and transmit it to the output side It is a mechanism to make it.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the mechanism of the priority differential mechanism of the present invention, and FIG. 2 is an explanatory view of the operation of the present invention.

As shown in FIG. 1, this mechanism gives priority to a first or second dynamic input between a first input member 1 connected to a first power and a second input member 2 connected to a second power. The output member 3 which selectively transmits by difference is installed. Output member 3
The upper limit pins 14, 15 and the lower limit pins 16,
17 is implanted, and a long hole 4e in the first intermediate member 4 is provided.
And 4f, the limit pins 14 and 15 are fitted to the elongated holes 5e and 5f in the second intermediate member 5, and the limit pins 16 and 17 are fitted to the output member 3. Second
The intermediate member 5 is in a restraining state in which the movement of the left and right δL is allowed by the elongated holes.

Each of the intermediate members 4 and 5 has a symmetrical shape about the center as shown in the figure. The right end of the first intermediate member 4 is a projection 4a, and the left end is a projection 4b. 1
The input member 1 is provided with inclined surfaces 4c and 4d which are shaped to close the gap. The inclined surface 4c has a steel ball 7 in contact with the inner sliding surface of the first input member 1, and the inclined surface 4d has the same first input. There is a steel ball 9 in contact with the inner sliding surface of the member 1 and the projection 4a
And 4b are pressed against each other by springs 6 and 8 with the stop ends at 4b. For this reason, the first intermediate member 4 is
Since the input member 1 is captured by the steel balls 7 and 9, the first input member 1 is integrally driven by the right or left movement.

The other second intermediate member 5 is the same as the first intermediate member 4, and the right end is a projection 5a and the left end is a projection 5b. There are inclined surfaces 5c and 5d, a steel ball 11 in contact with the inner sliding surface of the second input member 2 on the inclined surface 5c, and a steel ball 13 in contact with the inner sliding surface of the second input member 2 on the inclined surface 5d.
And a spring 10 having the projections 5a and 5b as stop ends,
Each surface is pressed against each other by a spring 12. Therefore, the second intermediate member 5 captures the second input member 2 by the steel balls 11 and 13, so that the second input member 2 integrally follows the right or left movement of the second input member 2.

The first intermediate member 4 has shafts 18 and 19 arranged in parallel, and the right release lever 22 and the left release lever 23 are symmetrically left and right.
Are fitted in each, and a spring 3 is placed between both levers.
1 is hung on the spring hanging pins 22b and 23b, and is urged by a force approaching the center. On the upper side, the upper end portion 22c of the right release lever 22 contacts the limit pin 14 implanted in the output member 3, and the upper end portion 23c of the left release lever 23 contacts the limit pin 15 of the output member 3, and On the side, the lower tip portions 22a and 23a are connected to the stopper pins 28 of the second intermediate member 5.
And 29, the steel balls 11 and 13 come close to each other with a gap slightly larger than the distance δL.

Similarly, the shaft 2 is attached to one of the second intermediate members 5.
The right release lever 24 and the left release lever 25 are symmetrically fitted to each other, and the spring 30 is hung between the two levers by the spring pins 24b and 25b, and the force toward the center is provided. It is energized by. On the lower side, the lower tip 24c of the right release lever 24 contacts the restriction pin 16 implanted in the output member 3, and the lower tip 25c of the left release lever 25 contacts the restriction pin 17 of the output member 3.
On the upper side, the upper end portions 24a and 25a hit the stopper pins 26 and 27 of the first intermediate member 4, and come close to the steel balls 7 and 9 with a gap slightly larger than the distance δL.

As shown in FIG. 1, the first intermediate member 4 has left and right protrusions 4g and 4h, and the second intermediate member 5 also has left and right protrusions 5g and 5h. The first intermediate member 4 and the second intermediate member 5 are limited to δL in the relative position due to the left and right movement of the first intermediate member 4 and the second intermediate member 5.

Next, the operation of the differential mechanism will be described in detail with reference to FIG. 2. FIG.
In the stationary state where power is not transmitted to the first and second members, the limit pins 14 and 15 on the upper side of the output member 3 are moved to the first by the left and right release levers 22 and 23 and the spring 31 hooked on the first intermediate member 4. The left and right release levers 24 and 25 on the second intermediate member 5 and the springs 3 hooked on the intermediate member 4 act to be located at the centers of the long holes 4e and 4f, respectively.
0, the limiting pins 16, 1, 1
7 acts on the center of each of the long holes 5e and 5f of the second intermediate member 5, so that the first intermediate member 4 and the second intermediate member 5 have a gap δL that can move from side to side, The first intermediate member 4 fixes the first input member 1 and the second intermediate member 5 fixes the second input member 2 while maintaining the balance.

FIG. 2B shows the case where the right power is applied to the second input member 2.
The steel ball 13 which is in contact with the sliding surface of the second input member 2 also tries to roll, but it bites into the inclined surface 5d of the second intermediate member 5, so that the second intermediate member 5 becomes more and more rigid. If the first intermediate member 4 holding the first input member 1 and the output member 3 move first and a small gap δL moves first while the first intermediate member 4 holding the first input member 1 and the output member 3 move, the right release is performed. The lower end 24c of the lever 24 is pushed leftward by the restriction pin 16 of the remaining output member 3, and slightly rotates clockwise about the shaft 18 while opposing the spring 30.

As described above, the distance between the steel ball 7 and the upper end 24a of the right release lever 24 is slightly larger than δL, but the distance between the upper end 24a and the shaft 18 is smaller than the length of the lower end 24c with respect to the shaft 18. Since the length is large, the upper end portion 24a falls significantly to the right with respect to the δL movement of the second intermediate member 5, and pushes the steel ball 7 against the spring 6 to the right. In this case, the steel ball 7 is released from the contact between the inclined surface 4c of the first intermediate member 4 and the sliding surface of the first input member 1 and floats, and the relationship between the other left shoulder inclined surface 4d and the steel ball 9 is the first. Since the first intermediate member 4 can slide to the right with respect to the input member 1,
When the second input member 2 continues to move to the right while the interval δL between the second intermediate member 5 and the first intermediate member 4 is lost, as shown in FIG. The intermediate member 5, the first intermediate member 4, and the output member 3 are integrated,
The sliding surface of the input member 1 is slid to the right, and the second
The rightward motion input given to the input member 2 can be transmitted to the output member 3.

Next, a case where a left motion input is obtained on the second input member 2 is shown in FIG. 2 (3). The inclined surface 5c of the member 2
The second intermediate member 5 moves to the left integrally with the second input member 2 to firmly capture the sliding surface of the second input member 2 with the steel ball 11 and the steel ball 11, but is released to the left by the restriction pin 17 of the output member 3. The lower end 25c of the lever 25 is pushed relatively rightward, and the left release lever 25 is tilted counterclockwise about the shaft 21. For this reason, the steel ball 9 is pushed to the left by the upper end portion 25a, and the first intermediate member 4 is pressed by the first intermediate member 4 in order to release the trapped state between the inclined surface 4d of the first intermediate member 4 and the sliding surface of the first input member 1. It becomes movable with respect to the member 1.

In the case of a leftward movement input, similarly to the right, when the first intermediate member 4 moves by a small gap δL between the intermediate members 4 and 5, the first intermediate member 4 becomes slidable with respect to the input member 1, and as shown in FIG. The input member 2 and the second intermediate member 5, the first intermediate member 4, and the output member 3 are integrated and can move to the left, and a leftward dynamic input given to the second input member 2 is transmitted to the output member 3 in the same manner. can do.

FIG. 2D shows an example in which a leftward power is applied to the first input member 1.
The left release lever 23 on the first intermediate member 4 is moved by the restriction pin 15 of the output member 3 which moves integrally with the first intermediate member 4 but moves together with the first intermediate member 4 according to the same principle as described above with the movement of the input member 1. As a result, the upper end portion 23c is relatively pushed rightward, and slightly rotates clockwise about the shaft 19. For this reason, the lower end portion 23a pushes the steel ball 13 to the left, and the inclined surface 5d of the second intermediate member 5 with the steel ball 13 interposed therebetween.
The state of capture between the first input member 1 and the first intermediate member 4 is released, and the second intermediate member 5 is free to move to the left, and the first input member 1 and the first intermediate member 4 are moved together. From the point in time when the projecting portion 4g of the first intermediate member 4 and the projecting portion 5g of the second intermediate member 5 have moved a small distance δL, they move integrally with the second intermediate member 5 and the output member 3, so that the first input member 1 Can input the same power to the output member 3 while sliding with respect to the second input member 2.

The case where the right and left motion inputs are applied to the second input member 2 and the case where the left input is applied to the first input member 1 have been described above.
When a rightward motion input is given to the first input member 1,
Since it can be understood that the same power can be transmitted to the output member 3 while sliding with respect to the second input member 2, the description is omitted.

In the above description, the case where a dynamic input is applied to either the first or second input member, but for example, the first input member 1 has rightward power, and then the second input member When the leftward power is applied to the second input member 2, since the priority power is the rightward power to the first member 1, the power applied to the second input member 2 slides and is not transmitted to the output member 3, but is not transmitted to the output member 3. When the same power in the right direction is applied to the member 2, the output is increased when the second input member 2 accelerates faster than the moving speed of the first input member 1 and exceeds a distance twice (2δL) the distance between the intermediate members. It can be easily understood that the power is switched to the rightward power applied to the second input member 2. This applies to the case where the leftward power is prioritized for the first input member 1 and the case where the right or left motion input is prioritized for the second input member 2, and the other operation is delayed later. When a dynamic input in the opposite direction is applied to the input member, the subsequent power is not output to the output member 3 side,
When the power in the same direction is applied, the output is switched to the later motion input side when the later power is accelerated and the 2δL intermediate member relatively moves.

[0021]

As described above, according to the structure of the present invention, in the manual adjustment of the AF lens, the manual operation is not accepted during the AF operation by the high-speed motor, and the AF operation by the motor at the time of the manual adjustment is added. In this case, if the adjustment is performed in the same direction, a high-speed motor operation is prioritized. If the adjustment is performed in the opposite direction, an extremely ideal AF lens barrel that can be adjusted with manual priority without accepting the motor operation can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a priority differential mechanism of an embodiment.

FIG. 2 is an explanatory diagram of an operation of the priority differential mechanism of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st input member 2 2nd input member 3 output member 4 1st intermediate member 5 2nd intermediate member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02B 7/08 G02B 7/04 A

Claims (2)

[Claims] 1. A differential mechanism for obtaining one dynamic output for two dynamic inputs movable in the left-right direction, wherein the output side recognizes a priority operation of the two dynamic inputs and a small difference δL in the left-right relative movement. Is provided, an output is obtained by following the input side from which the δL is first obtained at the initial motion of the two dynamic inputs, and the two dynamic inputs are simultaneously performed and the input directions are the same. If the relative speed difference between the two inputs exceeds the value δL, the dynamic output is switched to the dynamic input having the higher speed. 2. A first movement input member having a first movement input member and a second movement input member having a sliding surface, and a first movement input member having a mechanism for preventing lateral movement and capturing while contacting the respective sliding surfaces. An intermediate member and a second intermediate member, wherein the intermediate members are in a relation of restricting left and right movement by a small difference δL, and are commonly movable in the left and right directions by a small difference δL. The first and second moving input members are constituted by one moving output member to be connected to each other, and the relative moving input members oppose each other due to a small difference δL generated between the intermediate members due to the relative movement of the first moving input member or the second moving input member. 2. The priority differential mechanism according to claim 1, wherein the priority differential mechanism is obtained by releasing the restraint of the intermediate member on the sliding surface of (1).