CN201053482Y - Crank rocking rod mechanism with continuously variable crank length - Google Patents

Abstract

The utility model relates to a crank-rocker mechanism with continuously adjustable length of a crank, wherein, a crankshaft and an eccentric crank pin are formed into a double eccentric mechanism; a control motor is fixed inside the axle hole of the crankshaft; the gear ring arranged inside a planetary gear set is fixed with the crank pin; the sun gear of the planetary gear set is fixed with the output shaft of the control motor, while the planet carrier is arranged on the corresponding support holes of the crankshaft. The eccentric distance of the double eccentric mechanism is equal to the length of the crankshaft of the crank-rocker mechanism, and the continuous variation of the eccentric distance results in corresponding continuous variation of the length of the crankshaft; therefore, the continuous adjustment of the maximum swinging angular velocity of a rocker can be realized inside a crank-link mechanism.

Description

Crank-rocker mechanism with continuously variable crank length

(1) Technical field:

The utility model relates to a novel crank-rocker mechanism with continuously adjustable crank length, which belongs to the technical field of plane connecting rod transmission.

(two) background technology:

In the current traditional crank-rocker mechanism, the rod length is mostly a fixed value and cannot be adjusted. Although this mechanism can also realize the conversion between the rotary motion of the crank and the reciprocating swing motion of the rocker arm, the ratio between the conversion angular velocity is unique, and new parts must be replaced when the size of the crank needs to be changed.

(3) Contents of utility model:

The utility model discloses a crank-rocker mechanism with continuously variable crank length. The purpose of the utility model is to provide a crank-rocker mechanism whose crank length is continuously adjustable and which can realize different size requirements without replacing parts.

The utility model is a crank rocker mechanism with continuously variable crank length, which is characterized in that it is a double eccentric mechanism composed of a crankshaft 1 and an eccentric crankpin 2, and the crankpin 2 is independent in the crankshaft 1 under the control of the control motor 7 Turn to adjust the eccentricity; the control motor 7 is fixed in the shaft hole of the crankshaft 1; the ring gear 11 in the planetary gear set 6 is fixedly connected with the crank pin 2, and the sun gear 12 of the planetary gear set 6 is fixedly connected with the output shaft of the control motor 7 , the planetary gear 13 of the planetary gear set 6 is mounted on the corresponding supporting hole 10 of the crankshaft 1 . Aforesaid planetary gear and sun gear, its gear modulus can be selected according to actual situation needs, according to national technical standard (the gear modulus of general planetary gear and sun gear is selected as m=1.5mm～10mm).

Wherein, have shaft hole 15 in the crankshaft, there is the control motor 7 of band sliding brush 8 that is fixedly connected in shaft hole 15.

Wherein, the outer wall of the crankshaft is provided with an aperture 9 for leading the control motor 7 leads, and the outer wall has two sliding brushes 8 .

Wherein, there is an eccentric circular hole 14 on the big end face of the crankshaft 1 . The crank pin 2 is disc-shaped, on which a cylindrical pin body 5 is eccentrically fixed.

The eccentric distance of the double eccentric mechanism is the crank length of the crank rocker mechanism, so the continuous change of the eccentric distance of the double eccentric mechanism is the continuous change of the crank length of the crank connecting rod mechanism, so that the maximum swing of the rocker can be realized in the crank connecting rod mechanism. Continuously adjustable angular velocity.

Because the utility model adopts a novel double eccentric mechanism as the crank, it has the following advantages compared with the traditional crank rocker mechanism:

<1>The crank length can be adjusted automatically according to requirements.

<2> The adjustment of the crank length is continuous.

<3> The transmission ratio adjustment range between the crank rotation speed and the rocker arm swing maximum angular velocity is infinite.

(4) Description of drawings:

Shown in Fig. 1 is the structural representation of the utility model.

Figure 2 shows a schematic diagram of the internal structure of the utility model.

Figure 3 shows a schematic diagram of the crankshaft structure of the utility model.

1. Crankshaft 2. Crank pin 3. Connecting rod

4. Rocker arm 5. Cylindrical pin body 6. Planetary gear set

7. Control motor 8. Sliding brush 9. Small hole

10. Support hole 11. Ring gear 12. Sun gear

13. Planetary gear 14. Eccentric circular hole 15. Shaft hole

(5) Specific implementation methods:

Please refer to Fig. 1 and shown in Fig. 2, a crank-rocker mechanism with continuously variable crank length of the utility model mainly consists of a crankshaft 1, a crank pin 2, a planetary gear set 6, a control motor 7, a connecting rod 3, and a rocker arm 4 Composed of equal components, the planetary gear and sun gear in the planetary gear set, its m=1.5mm.

Among them, the crankshaft 1 and the crank pin 2 form a double eccentric mechanism; the ring gear 11 of the planetary gear set 6 is connected to the crank pin 2 by welding or clamping; It is connected with the crank pin 2 and can drive the crank pin 2 to rotate; the sun gear 12 of the planetary gear set 6 is fixed to the output shaft of the control motor 7, and the planetary gear 13 of the planetary gear set 6 is mounted on the corresponding support hole 10 of the crankshaft 1; The connecting rod 3 is connected with the crank pin 2 as a rotary pair, and the connecting rod 3 is connected with the rocking arm as a rotary pair.

When the control motor 7 does not rotate, the relative angle of rotation between the crankshaft 1 and the crankpin 2 is fixed, and the crankshaft 1 directly drives the crankpin 2 to rotate, and the crank length of the crank rocker mechanism is constant now. When the length of the crank needs to be adjusted, the motor 7 is controlled to output a certain angle of rotation to drive the crank pin 2 to rotate through an angle relative to the crankshaft 1. At this time, the distance between the central axis of the cylindrical pin body 5 on the crank pin 2 and the center of rotation of the crankshaft 1 is Changes occur, that is, the eccentricity of the double eccentric mechanism changes, and the length of the crank is adjusted. Therefore if change the output rotation angle of control motor 7 continuously, then the distance between the central axis of the cylindrical pin body 5 on the crank pin 2 and the center of rotation of the crankshaft 1 will change continuously, and now the crank length will obtain a continuous Adjustment.

Claims (4)

1. A crank rocker mechanism with continuously variable crank length is characterized in that: it is composed of a crankshaft (1) and an eccentric crank pin (2) to form a double eccentric mechanism, and the control motor (7) is fixed on the crankshaft (1) The ring gear (11) in the planetary gear set (6) is fixedly connected with the crank pin (2), and the sun gear (12) of the planetary gear set (6) is connected with the output shaft of the control motor (7) Fixed connection, the planetary gear (13) of the planetary gear set (6) is supported on the corresponding support hole (10) of the crankshaft (1). 2. The crank-rocker mechanism with continuously variable crank length according to claim 1, characterized in that: the outer wall of the crankshaft (1) is provided with a small hole (9) for leading the wire of the control motor (7), and the outer wall has a Two sliding brushes (8). 3. The crank-rocker mechanism with continuously variable crank length according to claim 1, characterized in that: an eccentric circular hole (14) is opened on the big end surface of the crankshaft (1). 4. The crank-rocker mechanism with continuously variable crank length according to claim 1, characterized in that: the crank pin (2) is disc-shaped, on which a cylindrical pin body (5) is eccentrically fixed.

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