CN117267326A - Transmission mechanism with adjustable transmission ratio - Google Patents

Abstract

The invention belongs to the technical field of mechanical transmission and discloses a transmission mechanism with an adjustable transmission ratio. It includes a driving pulley, a driven pulley and a transmission belt connecting the two. The diameter of the driving pulley is fixed. The transmission mechanism also includes a first driving gear, a second driving gear, a locking gear, a pin and several Perforated plate; the driven pulley includes a cylindrical base and several driven slide blocks; the driven slide block includes a first block and a second block integrally formed in the middle of the bottom end of the first block. The body is in the shape of an arc. The end of the second block connected to the first block is in the shape of an arc with the same arc as the first block. The second block is in the shape of a cuboid starting from the point where it is connected to the first block. One block extends in the direction of the center of the circle; a belt groove matching the transmission belt is provided on the arc surface of the first block, and a first cylinder is provided at one end of the second block away from the first block. The invention can realize transmission ratio adjustment quickly and consumes less time and financial resources.

Description

A transmission mechanism with adjustable transmission ratio

Technical field

The invention belongs to the technical field of mechanical transmission, and specifically relates to a transmission mechanism with an adjustable transmission ratio.

Background technique

In the field of mechanical transmission, the definition of transmission ratio is the ratio of the angular velocity of the active component and the driven component in the mechanism. The transmission ratio is greater than 1, which means that the active component rotates faster and the driven component rotates slower, which is deceleration (increased torque); transmission ratio If it is less than 1, it means that the active component rotates slowly and the driven component rotates fast, which is an increase in speed (a decrease in torque). This transmission mechanism is used in many fields, such as the automotive industry, shipbuilding industry, aviation industry, etc. The calculation formula of the transmission ratio is i=r/R (i is the transmission ratio, R is the radius of the active component, and r is the radius of the driven component).

In traditional transmission mechanisms, two driving pulleys and driven pulleys with unequal radii are generally connected by a transmission belt. However, the radii of the driving pulley and the driven pulley of this device are fixed, so the transmission ratio is fixed, resulting in One device can only use one transmission ratio. Adjusting the transmission ratio requires replacing parts, which consumes time and money.

Contents of the invention

In order to solve the disadvantage that the transmission ratio of the traditional transmission mechanism is not adjustable, the object of the present invention is to provide a transmission mechanism with an adjustable transmission ratio.

In order to achieve the above objects, the technical solutions adopted by the present invention are as follows:

A transmission mechanism with an adjustable transmission ratio, including a driving pulley, a driven pulley and a transmission belt connecting the two. The diameter of the driving pulley is fixed. What is special about it is that the transmission mechanism also includes a first drive belt. Gear, second drive gear, locking gear, pin and several perforated plates;

The driven pulley includes a cylindrical base and several driven slide blocks; the driven slide block includes a first block and a second block integrally formed in the middle of the bottom end of the first block. The body is in the shape of an arc. The end of the second block connected to the first block is in the shape of an arc with the same arc as the first block. The second block is rectangular starting from the point where it is connected to the first block. The center of the block extends in the direction of the circle; the arc surface of the first block is provided with a belt groove that matches the transmission belt, and an end of the second block away from the first block is provided with a first cylinder. The first block is located on the same side of the second block; the base is provided with a first notch and a second notch from its circumferential surface in the direction of its geometric center. The top surface of the second notch is flush with the top surface of the base. The notch is located below the second notch and the two are connected. The number of the first notch and the second notch is the same as the number of the driven slider. The shape, width and depth of the first notch are suitable for the first block of the driven slider. As long as the length of the first notch is less than the length of the second block (so that after the driven slider penetrates the first notch on the base, the remaining part can be exposed outside the base), the second notch is concave starting from the circumferential surface of the base. The groove extends toward the geometric center of the base. The width of the second notch matches the first cylinder. The length = the length of the first notch and the depth < the height of the first cylinder (facilitating the first cylinder to pass through the second notch. The top surface protrudes and is connected to the base through the perforated plate), the line between "the intersection of the side length in the length direction of the top surface of the second notch and the circumference of the top surface of the base" and "between the geometric center of the top surface of the base" and The angle between the sides in the length direction of the top surface of the second notch is 5~10° (this narrows the gap between the two adjacent driven sliders, and during the rotation of the entire device, the amplitude of the up and down bumps of the transmission belt becomes smaller, thus ensuring the stability of the transmission belt when the entire device rotates); there are three second cylinders on the top surface of the base, and one of the second cylinders is located at the geometric center of the base, and the remaining two second cylinders are respectively Located at the non-geometric center position on the base, the two second cylinders are located between any two adjacent first gaps, but the two second cylinders are not located between the same two adjacent first gaps at the same time. between; a first cylindrical through hole is provided on the top surface of the base, and a rotation groove is spirally formed around the circumferential surface of the first cylindrical through hole from its inner wall outward;

The number of the perforated plates is the same as the number of driven slide blocks, and second cylindrical through holes are provided at both ends of the perforated plates;

A third cylindrical through hole is provided at the geometric center of the first driving gear, and several third cylinders are provided on the top surface. The number of third cylinders is the same as the number of driven slide blocks, and all third cylinders The distance between the geometric center of the body and the geometric center of the first drive gear is equal;

A fourth cylindrical through hole is provided at the geometric center of the second driving gear;

A fifth cylindrical through hole is provided at the geometric center of the locking gear, a number of sixth cylindrical through holes are provided on the top surface, and the distance between the geometric centers of all sixth cylindrical through holes and the geometric center of the locking gear is equal distance;

The pin includes an end cap and a cylindrical body integrally connected thereto, with a fourth cylinder protruding from the surface of the cylindrical body;

The driven slider penetrates the first gap one by one, the first cylinder is embedded in the corresponding second gap, and the driven slider is embedded in the base; the third cylindrical through hole of the first driving gear is in contact with the geometric center position of the base The second cylinder cooperates to connect the first driving gear with the base; the two second cylindrical through holes of the orifice plate are respectively connected with the first cylinder on the driven slider and the third cylinder on the first driving gear. Cooperate to connect the driven slide block with the first driving gear; the fourth cylindrical through hole of the second driving gear and the fifth cylindrical through hole of the locking gear are respectively connected with the two second cylinders at the non-geometric center position on the base. Cooperate to connect the second driving gear and the locking gear to the base respectively, and at the same time, the second driving gear and the locking gear are meshed with the first driving gear respectively; one of the sixth cylindrical through holes on the locking gear is connected with the base The first cylindrical through hole is concentric, the cylindrical body of the pin is inserted into the sixth cylindrical through hole, and the fourth cylinder on the pin is screwed into the rotation groove on the first cylindrical through hole, locking the locking gear on the base superior.

Preferably, the transmission belt is a V-belt, and correspondingly, the belt groove on the first block is a V-belt groove.

Preferably, the number of driven slide blocks is six.

Preferably, the connection between "the intersection point of the side length in the length direction of the top surface of the second notch and the circumference of the top surface of the base" and "between the geometric center of the top surface of the base" and the length of the side length in the length direction of the top surface of the second notch is The angle between them is 5~10°.

Preferably, the centers of the bottom surfaces of the three second cylinders are on the same straight line.

Preferably, the number of sixth cylindrical through holes on the locking gear is ten.

Preferably, several grooves are evenly provided on the side of the end cap in order to increase friction.

Beneficial effects: The present invention can change the radius of the driven pulley by adjusting the displacement of the driven slider to change the transmission ratio. Therefore, compared with the traditional transmission mechanism, the device of the present invention can quickly adjust the transmission ratio and reduce the loss. It requires less time and financial resources, and greatly improves the disadvantages of complicated transmission ratio adjustment of traditional transmission mechanisms.

Description of the drawings

Figure 1: Schematic diagram of the overall structure of the present invention;

Figure 2: Explosion diagram of the present invention;

Figure 3: Schematic diagram of the three-dimensional structure of the base;

Figure 4: Perspective structural diagram of the base;

Figure 5: Schematic diagram of the front structure of the base;

Figure 6: The back of the base;

Figure 7: Structural diagram of the first cylindrical through hole;

Figure 8: Structural diagram of the driven slider;

Figure 9: Structural diagram of the first driving gear;

Figure 10: Structural diagram of the second driving gear;

Figure 11: Structural diagram of the locking gear;

Figure 12; Structural diagram of a plate with holes;

Figure 13: Structural diagram of the pin;

Among them, the reference marks are:

1-First driving gear; 2-Second driving gear; 3-Lock gear; 4-Pin; 5-Base; 6-Perforated plate; 7-Driven slider, 71-First block, 72 -The second block; 8-drive pulley; 9-V-belt; 10-first notch; 11-second notch; 12-rotating groove; 13-cylindrical body; 14-end cover; 15-V-belt Slot; 161-first cylinder, 162-second cylinder, 163-third cylinder, 164-fourth cylinder; 171-first cylindrical through hole, 172-second cylindrical through hole, 173-third Cylindrical through hole, 174-the fourth cylindrical through hole, 175-the fifth cylindrical through hole, 176-the sixth cylindrical through hole.

Detailed ways

In order to make the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Example 1

As shown in Figures 1 to 13, a transmission mechanism with an adjustable transmission ratio includes a driving pulley 8, a driven pulley and a V-belt 9 connecting the two. The diameter of the driving pulley 8 is fixed and has a special feature. The transmission mechanism further includes a first driving gear 1, a second driving gear 2, a locking gear 3, a pin 4 and six perforated plates 6;

The driven pulley includes a cylindrical base 5 and six driven slide blocks 7; the driven slide blocks 7 include a first block 71 and a second block integrally formed at the middle position of the bottom end of the first block 71. body 72, the first block 71 is in the shape of an arc, and one end of the second block 72 connected to the first block 71 is in the shape of an arc with the same arc as the first block 71. The connection point of the first block 71 begins to be rectangular and extends toward the center of the first block 71; a V-belt groove 15 adapted to the V-belt 9 is provided on the arc surface of the first block 71, and the second block 71 The end of 72 away from the first block 71 is provided with a first cylinder 161. The first cylinder 161 and the first block 71 are located on the same side of the second block 72; the base 5 faces its geometric center from its circumference A first notch 10 and a second notch 11 are provided in the direction. The top surface of the second notch 11 is flush with the top surface of the base 5. The first notch 10 is located below the second notch 11 and the two are connected. The first notch 10 and the second notch The number of 11 is the same as the number of driven slider 7. The shape, width and depth of the first notch 10 are adapted to the first block 71 of the driven slider 7 but the length of the first notch 10 is less than the second block. The length of the second notch 11 is 72, and the second notch 11 extends from the circumferential surface of the base 5 in a groove shape toward the geometric center of the base 5. The width of the second notch 11 matches the first cylinder 161, and the length = first notch 10 The length and depth of the first cylinder 161 are less than the height of the first cylinder 161, and the line between "the intersection of the length of the top surface of the second notch 11 and the circumference of the top surface of the base 5" and "between the geometric center of the top surface of the base 5" The included angle with the length direction of the top surface of the second notch 11 is 8°; three second cylinders 162 are provided on the top surface of the base 5, and the centers of the bottom surfaces of the three second cylinders 162 are on the same straight line. on the base 5, and one of the second cylinders 162 is located at the geometric center of the base 5, and the remaining two second cylinders 162 are located at the non-geometric center positions of the base 5. At the same time, the two second cylinders 162 are respectively located on the top. Between two adjacent first notches 10 and between two adjacent first notches 10 below; a first cylindrical through hole 171 is opened on the top surface of the base 5, and the first cylindrical through hole 171 extends outward from its inner wall A rotation groove 12 is spirally formed around its circumferential surface;

Each of the two ends of the perforated plate 6 is provided with a second cylindrical through hole 172;

A third cylindrical through hole 173 is provided at the geometric center of the first driving gear 1, six third cylinders 163 are provided on the top surface, and the geometric centers of all third cylinders 163 are consistent with the center of the first driving gear 1. The distance between geometric centers is equal;

A fourth cylindrical through hole 174 is provided at the geometric center of the second driving gear 2;

A fifth cylindrical through hole 175 is provided at the geometric center of the locking gear 3, and ten sixth cylindrical through holes 176 are provided on the top surface, and the geometric centers of all sixth cylindrical through holes 176 are consistent with the locking gear 3. The distance between geometric centers is equal;

The pin 4 includes an end cap 14 and a cylindrical body 13 integrally connected thereto. The cylindrical body 13 has a protruding surface with a fourth cylinder 164 on its surface, and several grooves are evenly provided on the side of the end cap 14;

The driven slider 7 penetrates into the first notch 10 in a one-to-one correspondence, and the first cylinder 161 is embedded in the corresponding second notch 11, so that the driven slider 7 is embedded in the base 5; the third cylinder of the first driving gear 1 passes through The hole 173 cooperates with the second cylinder 162 at the geometric center of the base 5 to connect the first driving gear 1 with the base 5; the two second cylindrical through holes 172 of the orifice plate 6 are respectively connected with the second cylinder 162 on the driven slider 7 The first cylinder 161 and the third cylinder 163 on the first driving gear 1 cooperate to connect the driven slider 7 with the first driving gear 1; the fourth cylindrical through hole 174 of the second driving gear 2, the locking The fifth cylindrical through hole 175 of the gear 3 cooperates with the two second cylinders 162 at the non-geometric center position of the base 5 respectively to connect the second driving gear 2, the locking gear 3 and the base 5 respectively. Gear 2 and locking gear 3 mesh with the first driving gear 1 respectively; one of the sixth cylindrical through holes 176 on the locking gear 3 is concentric with the first cylindrical through hole 171 on the base 5, and the cylindrical shape of the pin 4 The main body 13 is inserted into the sixth cylindrical through hole 176 and at the same time the fourth cylinder 164 on the pin 4 is screwed into the rotation groove 12 on the first cylindrical through hole 171 to lock the locking gear 3 on the base 5 .

work process:

(1) Keep the device stationary, and then manually rotate the pin 4 out of the base 5;

(2) Install a motor on the second driving gear 2, which can drive the first driving gear 1 to rotate after being powered on. The driven slider 7 rotates along the radial direction through the connection of the perforated plate 6 as the first driving gear 1 rotates. movement, the distance that the driven slider 7 moves is the distance that the orifice plate 6 rotates, which causes the radius of the driven pulley to change and the transmission ratio to change; when the first driving gear 1 rotates, the locking gear 3 will rotate accordingly. When the sixth cylindrical through hole 176 is concentric with the first cylindrical through hole 171, turn off the power to make the device stationary, and then insert the cylindrical body 13 of the pin 4 into the sixth cylindrical through hole 176 and at the same time the fourth cylindrical body 164 on the pin 4 Screw into the rotation groove 12 on the first cylindrical through hole 171 to lock the locking gear 3 on the base 5, thereby limiting the rotation of the locking gear 3; when the base 5 rotates, the fourth cylinder 164 of the pin 4 Stuck in rotation due to centrifugal force (F=m*ω ² *r, m is the mass of the fourth cylinder 164, ω is the rotation angular velocity of the base 5, r is the distance of the fourth cylinder 164 from the geometric center of the base 5) In the groove 12, the locking gear 3 will not rotate, the driven slider 7 will not move, the radius remains unchanged, and the transmission ratio is the value calculated under this condition;

(3) When you want to change the transmission ratio again, repeat steps (1)-(2) and adjust the driven slider 7 again to change the radius of the driven pulley. The transmission ratio will also change, and then rotate pin 4. Then, it is inserted into the different sixth cylindrical through hole 176 on the locking gear 3; repeating the steps can quickly change the transmission ratio, and the loss time is less, which greatly improves the disadvantages of complicated transmission ratio adjustment of the traditional device.

Claims (7)

1. The utility model provides a drive mechanism of adjustable transmission ratio, includes driving pulley, driven pulley and connects the drive belt of both, and the diameter of driving pulley is fixed unchanged, its characterized in that: the transmission mechanism further comprises a first driving gear, a second driving gear, a locking gear, a pin and a plurality of perforated plates;

the driven belt wheel comprises a cylindrical base and a plurality of driven sliding blocks; the driven sliding block comprises a first block body and a second block body which is integrally formed at the middle position of the bottom end of the first block body, the first block body is arc-shaped, one end of the second block body, which is connected with the first block body, is arc-shaped with the same radian as the first block body, and the second block body extends from the position, which is connected with the first block body, in a cuboid shape towards the center direction of the first block body; the arc surface of the first block is provided with a belt groove matched with the transmission belt, one end of the second block, which is far away from the first block, is provided with a first cylinder, and the first cylinder and the first block are positioned on the same side of the second block; the base is provided with a first notch and a second notch from the circumference of the base to the geometric center direction of the base, the top surface of the second notch is level with the top surface of the base, the first notch is positioned below the second notch and communicated with the second notch, the number of the first notch and the second notch is the same as that of the driven sliding blocks, the shape, the width and the depth of the first notch are matched with those of the first block of the driven sliding blocks, but the length of the first notch is smaller than that of the second block, the second notch extends from the circumference of the base to the geometric center direction of the base in a groove shape, the width of the second notch is matched with the first cylinder, the length = the length of the first notch and the depth of the second notch are smaller than the height of the first cylinder, and an included angle between a connecting line between the length of the second notch in the length direction of the side of the second notch and the circumference of the top surface of the base and the geometric center of the base is 5-10 degrees; three second cylinders are arranged on the top surface of the base, one of the second cylinders is positioned at the geometric center of the base, the remaining two second cylinders are respectively positioned at the non-geometric center of the base, and meanwhile, the two second cylinders are positioned between any two adjacent first gaps, but the two second cylinders are not positioned between the same two adjacent first gaps at the same time; the top surface of the base is provided with a first cylindrical through hole, and the first cylindrical through hole is spirally provided with a rotary groove around the circumference surface of the first cylindrical through hole from the inner wall of the first cylindrical through hole outwards;

the number of the perforated plates is the same as that of the driven sliding blocks, and second cylindrical through holes are respectively formed in the two ends of each perforated plate;

a third cylindrical through hole is formed in the geometric center position of the first driving gear, a plurality of third cylinders are arranged on the top surface of the first driving gear, the number of the third cylinders is the same as that of the driven sliding blocks, and the distances between the geometric centers of all the third cylinders and the geometric center of the first driving gear are equal;

a fourth cylindrical through hole is formed in the geometric center position of the second driving gear;

a fifth cylindrical through hole is formed in the geometric center of the locking gear, a plurality of sixth cylindrical through holes are formed in the top surface of the locking gear, and the distances between the geometric centers of all the sixth cylindrical through holes and the geometric center of the locking gear are equal;

the pin comprises an end cover and a cylindrical main body integrally connected with the end cover, and a fourth cylinder is arranged on the surface of the cylindrical main body, protruding out of the surface of the cylindrical main body;

the driven sliding blocks penetrate into the first gaps in a one-to-one correspondence manner, the first cylinders are embedded into the corresponding second gaps, and the driven sliding blocks are embedded into the base; the third cylindrical through hole of the first driving gear is matched with the second cylindrical body at the geometric center position of the base, and the first driving gear is connected with the base; the two second cylindrical through holes of the perforated plate are respectively matched with a first cylinder on the driven sliding block and a third cylinder on the first driving gear to connect the driven sliding block with the first driving gear; the fourth cylindrical through hole of the second driving gear and the fifth cylindrical through hole of the locking gear are respectively matched with two second cylinders at the non-geometric center position on the base, the second driving gear and the locking gear are respectively connected with the base, and meanwhile, the second driving gear and the locking gear are respectively meshed with the first driving gear; one of the sixth cylindrical through holes on the locking gear is concentric with the first cylindrical through hole on the base, the cylindrical main body of the pin is inserted into the sixth cylindrical through hole, and the fourth cylinder on the pin is screwed into the rotating groove on the first cylindrical through hole, so that the locking gear is locked on the base.

2. The adjustable ratio transmission mechanism of claim 1, wherein: the transmission belt is a triangular belt, and correspondingly, the belt groove on the first block body is a triangular belt groove.

3. The adjustable ratio transmission mechanism of claim 1, wherein: the number of the driven sliding blocks is six.

4. The adjustable ratio transmission mechanism of claim 1, wherein: the included angle between the connecting line between the intersection point of the side length of the second notch top surface in the length direction and the circumference of the base top surface and the geometric center of the base top surface and the side length of the second notch top surface in the length direction is 5-10 degrees.

5. The adjustable ratio transmission mechanism of claim 1, wherein: the circle centers of the bottom surfaces of the three second cylinders are on the same straight line.

6. The adjustable ratio transmission mechanism of claim 1, wherein: the number of the sixth cylindrical through holes on the locking gear is ten.

7. The adjustable ratio transmission mechanism of claim 1, wherein: the side of the end cover is uniformly provided with a plurality of grooves.