Speed reducer with bidirectional self-locking function

Abstract

The utility model relates to the technical field of speed reducers, in particular to a speed reducer with a bidirectional self-locking function. Comprising a machine shell, an input shaft, a middle shaft and an output shaft which conduct transmission through a gear set are rotationally installed on the machine shell, a groove body is located and installed in the machine shell and located at the position of the middle shaft or the output shaft, a rotating disc coaxially connected with the middle shaft or the output shaft is rotationally installed in a groove of the groove body, and an arc-shaped notch is formed in the rotating disc in the circumferential direction. A first groove and a second groove are formed by the notch and the inner wall of the groove body, a first limiting block is slidably installed in the first groove, a second limiting block is slidably installed in the second groove, the first groove is provided with a first limiting part, and the second groove is provided with a second limiting part. A driving gear driven by the input shaft is rotationally mounted on the transition shaft or the output shaft, and a shifting bolt is mounted on the driving gear. By means of the structure, the speed reducer can achieve bidirectional self-locking, and the whole speed reducer is more compact in structure and more convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of speed reducer, specifically relates to a speed reducer with bidirectional self locking. BACKGROUND

[0002] Speed reducer is a kind of mechanical transmission device for reducing the output speed of power source and corresponding increase output torque, it is through the cooperation of transmission structure such as gear, the movement of input shaft input is converted into the movement of output shaft low speed, high torque through the transmission of intermediate shaft, to meet the matching demand of power and speed of mechanical equipment.In agricultural production, speed reducer is often applied on film roller, to make the operator more labor-saving when winding film.

[0003] The applicant applied for and obtained the authorization of the Chinese new application utility model patent with the authorization announcement number CN220906847U on April 10, 2024, and disclosed a bidirectional locking crank and a film roller using the crank, which mainly includes a speed reducer and a crank arranged on the input shaft of the speed reducer, and a self-locking mechanism capable of realizing bidirectional self-locking is arranged on the crank.The applicant found that the self-locking mechanism arranged on the outside of the speed reducer would occupy more space of the whole device, and it was inconvenient to use. UTILITY MODEL CONTENT

[0004] In view of the above problems, the utility model provides a speed reducer with bidirectional self locking to solve the problem that the self-locking mechanism is located on the outside of the speed reducer in the prior art, so that the whole device occupies more space.

[0005] The utility model is implemented by using the following technical scheme: a speed reducer with bidirectional self locking, including the casing, the input shaft, the intermediate shaft and the output shaft are rotationally installed on the casing and are driven by gear set, the casing is positioned and installed with the groove body in the position of the intermediate shaft or the output shaft, the disc is rotationally installed in the groove of the groove body and is coaxially connected with the intermediate shaft or the output shaft, the disc is provided with the arc-shaped notch in the circumferential direction, the notch and the inner wall of the groove body form the first groove and the second groove, the first limiting block is slidably installed in the first groove, the second limiting block is slidably installed in the second groove, the first limiting part that can clamp the first limiting block is arranged at the end of the first groove extending in the counterclockwise direction, the second limiting part that can clamp the second limiting block is arranged at the end of the second groove extending in the clockwise direction, the driving gear is rotationally installed on the transition shaft or the output shaft and is driven by the input shaft, and the driving gear is fixedly installed with the push pin that can push the first limiting block away from the first limiting part or push the second limiting block away from the second limiting part on the side close to the disc.

[0006] Through the above structure, the whole self-locking mechanism is arranged in the interior of the speed reducer, when the input shaft rotates, the input shaft drives the driving gear to unlock the self-locking mechanism, and when the input shaft stops rotating, the driving gear also stops rotating, the self-locking mechanism realizes bidirectional self-locking, thereby making the speed reducer neither affect transmission nor realize bidirectional self-locking. Compared with the external self-locking mechanism, the structure of the device is more compact and more convenient to use.

[0007] Preferably, one end of the first slot provided with the first limiting part is in communication with one end of the second slot provided with the second limiting part, and the latch is located between the first limiting block and the second limiting block. Through the communication of the first slot and the second slot, the device can realize the unlocking of the self-locking mechanism in the clockwise direction and the counterclockwise direction by only one latch.

[0008] Preferably, the slot body, the rotating disc and the driving gear are all installed on the intermediate shaft, the input shaft is fixedly installed with an input gear, the input gear is engaged with the driving gear, the intermediate shaft is fixedly installed with an intermediate gear on the side away from the rotating disc, and the output shaft is fixedly installed with an output gear engaged with the intermediate gear. By arranging the self-locking mechanism on the intermediate shaft, the friction between the components is smaller, and the service life is increased.

[0009] Preferably, the size of the driving gear is larger than that of the input gear and the intermediate gear, and the size of the intermediate gear is smaller than that of the output gear. Through the above gear size, double reduction can be realized, that is, under the condition that the input shaft inputs the same force, the output shaft outputs greater torque.

[0010] Preferably, the rotating disc is further provided with a driving slot, the driving gear is fixedly installed with a driving latch, and one end of the driving latch away from the driving gear is located in the driving slot. Through the arrangement of the driving slot and the driving latch, the force of pushing the rotating disc can be borne by the latch, so that the service life of the latch is longer.

[0011] Preferably, the driving slot and the driving latch are both provided with two groups, and the two groups of driving slots and driving latches are symmetrically arranged. Through the arrangement of the two groups of driving slots and driving latches, the stress of the driving latch is more stable, and the service life of the device is further increased.

[0012] Preferably, the first slot and the second slot are relatively independent; the toggle lever comprises a first toggle lever and a second toggle lever, when the second toggle lever abuts to one end of the second slot close to the second limiting part, the first toggle lever makes the first limiting block unable to be clamped to the first limiting part; when the first toggle lever abuts to one end of the first slot close to the first limiting part, the second toggle lever makes the second limiting block unable to be clamped to the second limiting part. Through the relatively independent first slot and the second slot, the device does not need to set a driving toggle lever for pushing the rotating disc, when the first toggle lever toggles the first limiting block, the second toggle lever drives the rotating disc to rotate, when the second toggle lever toggles the second limiting block, the first toggle lever drives the rotating disc to rotate.

[0013] Preferably, the first limiting block and the second limiting block are both in a cylindrical shape. The cylindrical limiting block is more convenient for the production of the device and can be more stable when cooperating with the limiting part.

[0014] Preferably, the slot body is provided with a clamping groove, the shell is fixedly provided with a clamping block matched with the clamping groove, and one end of the clamping block away from the shell is inserted into the clamping groove. Through the cooperation of the clamping groove and the clamping block, the effect of positioning and installing the slot body in the shell is realized.

[0015] Preferably, a first spring is arranged between one end of the first slot away from the first limiting part and the first limiting block, and a second spring is arranged between one end of the second slot away from the second limiting part and the second limiting block. Through the arrangement of the first spring and the second spring, the first limiting block and the second limiting block return to the position of the corresponding limiting part more quickly without the intervention of the toggle lever, that is, the self-locking reaction is more sensitive.

[0016] In summary, the beneficial effects of the utility model lie in:

[0017] 1. The self-locking mechanism composed of the slot body, the rotating disc, the first slot, the second slot, the first limiting block and the second limiting block is directly installed in the interior of the speed reducer, the space in the interior of the speed reducer is fully utilized, so that the structure of the device is more compact, the device can save more space when being used or stored, and the device is more convenient to use; in addition, the self-locking mechanism is arranged in the interior of the speed reducer, the aging speed of the self-locking mechanism is reduced, and the service life of the device is increased.

[0018] 2. The self-locking mechanism is arranged on the intermediate shaft, so that the torque load borne by the self-locking mechanism in the device is smaller, the material strength requirement and the design complexity are reduced, and the durability of the self-locking mechanism is improved; in addition, the space around the intermediate shaft is relatively spacious, and the installation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an overall structural schematic view of the utility model of the speed reducer with bidirectional self-locking;

[0020] Figure 2 Fig. 4 is a schematic view of the internal structure of the speed reducer housing;

[0021] Figure 3 Fig. 5 is a schematic view of the installation position of the self-locking mechanism;

[0022] Figure 4 Fig. 6 is a schematic view of the structure of the intermediate gear;

[0023] Figure 5 Fig. 7 is a schematic view of the structure of the self-locking mechanism cooperating with the driving pin and the pushing pin;

[0024] Figure 6 Fig. 8 is a schematic view of the structure of the intermediate gear in the second embodiment;

[0025] Figure 7 Fig. 9 is a schematic view of the structure of the self-locking mechanism cooperating with the first pin and the second pin in the second embodiment.

[0026] In the figure: 1 - housing; 2 - input shaft; 3 - output shaft; 4 - intermediate shaft; 5 - input gear; 6 - driving gear; 7 - intermediate gear; 8 - output gear; 10 - clamping block; 11 - pushing pin; 12 - driving pin; 13 - groove body; 14 - clamping groove; 15 - rotating disc; 16 - driving groove; 17 - first spring; 18 - first limiting block; 19 - second limiting block; 20 - second spring; 21 - first groove; 22 - second groove; 23 - first pin; 24 - second pin; 25 - first limiting part; 26 - second limiting part. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0028] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] The following is a description of the preferred embodiments of the present application in conjunction with the accompanying drawings. Example One:

[0030] As Figure 1 , Figure 2 , Figure 3 , Figure 4The utility model provides a kind of reducer with bidirectional self-locking, including the shell 1 of reducer, on shell 1 rotationally installed is driven by gear set and is input shaft 2, intermediate shaft 4 and output shaft 3.In intermediate shaft 4 or output shaft 3 is installed, the self-locking mechanism that can carry out bidirectional self-locking, self-locking mechanism includes the groove body 13 rotationally installed in intermediate shaft 4 or output shaft 3, groove body 13 is fixed compared with shell 1.In the inside of groove body 13 rotationally installed is turntable 15, turntable 15 is coaxially fixedly connected with the intermediate shaft 4 or output shaft 3 of groove body 13 installation, arc-shaped notch is set up on turntable 15 along circumference, notch and groove body 13 inner wall form first slot 21 and second slot 22, first slot 21 is slidably installed with first limit block 18, second slot 22 is slidably installed with second limit block 19, the end of first slot 21 to counterclockwise direction is equipped with the first limit part 25 of being able to hold first limit block 18, the end of second slot 22 to clockwise direction is equipped with the second limit part 26 of being able to hold second limit block 19.In the intermediate shaft 4 or output shaft 3 of groove body 13 installation rotationally installed is the driving gear 6 that can follow input shaft 2 is rotated, driving gear 6 is fixedly installed with the push pin 11 of being able to push first limit block 18 away from first limit part 25 or second limit block 19 away from second limit part 26 on the side close to turntable 15.

[0031] Wherein, first limit part 25 and second limit part 26 can be formed by additionally setting arc-shaped protrusion or arc-shaped gasket, utilize arc-shaped protrusion, so that the inner diameter of first slot 21 and second slot 22 at the end is smaller, thereby holding the limit block in the slot. Or, first limit part 25 and second limit part 26 are directly formed by the inner diameter of first slot 21 and second slot 22 at the end gradually smaller, thereby holding its corresponding limit block.

[0032] As Figure 5As shown, one end of the first slot 21 provided with the first limiting part 25 and one end of the second slot 22 provided with the second limiting part 26 are communicated, and the latch 11 is located between the first limiting block 18 and the second limiting block 19. In this way, only one latch 11 can realize the bidirectional unlocking of the self-locking mechanism, which is more convenient to use. Taking the clockwise rotation of the drive gear 6 as an example, when the drive gear 6 rotates clockwise, the latch 11 will rotate the first limiting block 18 clockwise, thereby preventing the first limiting block 18 from affecting the rotation of the rotating disc 15. With the continuous rotation of the drive gear 6, the latch 11 will push the first limiting block 18 to the end of the first slot 21 away from the first limiting part 25, thereby pushing the rotating disc 15 to rotate. When the drive gear 6 no longer rotates, the cooperation of the first limiting block 18 and the first limiting part 25 will prevent the rotating disc 15 from continuing to rotate clockwise, and the cooperation of the second limiting block 19 and the second limiting part 26 will prevent the rotating disc 15 from continuing to rotate counterclockwise, thereby realizing bidirectional locking. The principle of counterclockwise rotation of the drive gear 6 is the same as that of clockwise rotation.

[0033] As shown in Figure 2 , Figure 4 The self-locking mechanism and the drive gear 6 can be installed on the output shaft 3 or the intermediate shaft 4. When the self-locking mechanism is installed on the output shaft 3, the input shaft 2 is fixedly installed with an input gear 5, the intermediate shaft 4 is fixedly installed with a first gear meshing with the input gear 5, and the output shaft is rotatably installed with a drive gear 6 meshing with the second gear for unlocking the self-locking mechanism. In order to improve the service life of the device, in this embodiment, the self-locking mechanism and the drive gear 6 are both installed on the intermediate shaft 4. Specifically, the input shaft 2 is fixedly installed with an input gear 5, the input gear 5 meshes with the drive gear 6, the intermediate shaft 4 is fixedly installed with an intermediate gear 7 on the side away from the rotating disc 15, and the output shaft 3 is fixedly installed with an output gear 8 meshing with the intermediate gear 7.

[0034] In order to improve the torque of the output shaft 3, the sizes of the gear set are set as follows: the size of the drive gear 6 is greater than that of the input gear 5 and the intermediate gear 7, and the size of the intermediate gear 7 is smaller than that of the output gear 8.

[0035] Due to the above-mentioned size setting of the gear set, the torque state of the intermediate shaft 4 is smaller than that of the output shaft 3, so that installing the self-locking mechanism on the intermediate shaft 4 makes the torque load borne by the self-locking mechanism in the device smaller, reduces the material strength requirement and design complexity, and improves the durability of the self-locking mechanism. In addition, the space around the intermediate shaft 4 is relatively spacious, which is more convenient for installation.

[0036] As a further illustration of the present example, only the rotation of the dial 15 is driven by the rotation of the toggle pin 11, so that the stress position is only on the toggle pin 11, thereby reducing the service life of the toggle pin 11, so the driving slot 16 is arranged on the dial 15, the driving gear 6 is fixedly installed with the driving pin 12, and the end of the driving pin 12 away from the driving gear 6 is located in the driving slot 16, when the driving gear 6 rotates, the driving pin 12 can abut against the side wall of the driving slot 16, and with the continuous rotation of the driving gear 6, the driving pin 12 will push the dial 15 to rotate.

[0037] As a further illustration of the present example, the driving slot 16 and the driving pin 12 are both provided with two groups, and the two groups of driving slot 16 and driving pin 12 are symmetrically arranged, thereby making the structure of the driving pin 12 more stable.

[0038] As a further illustration of the present example, the first spring 17 is arranged between the end of the first slot 21 away from the first limiting portion 25 and the first limiting block 18, and the second spring 20 is arranged between the end of the second slot 22 away from the second limiting portion 26 and the second limiting block 19. Taking the clockwise locking as an example, although locking can also be performed when the first spring 17 is not installed, the dial 15 needs to rotate a small distance clockwise to make the first limiting block 18 stuck, and after the first spring 17 is installed, when the driving gear 6 rotates clockwise, the toggle pin 11 will push the first limiting block 18 away from the first limiting portion 25, and when the driving gear 6 no longer rotates, the first spring 17 will pop out the first limiting block 18, thereby making the first limiting block 18 faster to stick the device, thereby making the reaction of the device more sensitive. The second spring 20 has the same effect as the first spring 17.

[0039] The shapes of the first limiting block 18 and the second limiting block 19 can be spherical, but in the present embodiment, the first limiting block 18 and the second limiting block 19 are both cylindrical.

[0040] In order to ensure that the slot body 13 will not be rotated by the intermediate shaft 4, the clamping slot 14 is arranged on the slot body 13, and the clamping block 10 cooperating with the clamping slot 14 is fixedly installed on the casing 1, and the end of the clamping block 10 away from the casing 1 is inserted into the clamping slot 14.

[0041] The working principle of the embodiment is that, taking the clockwise rotation of the input shaft 2 as an example, the input shaft 2 drives the input gear 5 to rotate clockwise, the input gear 5 in turn drives the driving gear 6 to rotate counterclockwise, the latch 11 is actuated to actuate the second limiting block 19 counterclockwise, the two driving latches 12 push the rotating disc 15 to rotate counterclockwise, thereby driving the intermediate shaft 4 to rotate counterclockwise, so as to drive the output shaft 3 to rotate clockwise through the intermediate gear 7 and the output gear 8. When the input shaft 2 stops rotating, the driving gear 6 also stops rotating. At this time, if the output shaft 3 continues to rotate clockwise under the action of inertia, that is, if the rotating disc 15 continues to rotate counterclockwise, the second limiting portion 26 will be blocked by the second limiting block 19. If the output shaft 3 reverses, that is, if the rotating disc 15 rotates clockwise, the first limiting portion 25 will be blocked by the first limiting block 18, thereby achieving bidirectional locking. The principle of counterclockwise rotation of the input shaft 2 is the same as that of clockwise rotation. Embodiment two

[0042] As shown in Figure 1 , Figure 2 , Figure 6 , Figure 7 The structure in the embodiment is substantially the same as that in embodiment one, and the same parts will not be described again. The difference between the two is that the first slot 21 and the second slot 22 are relatively independent in the embodiment. The latch 11 includes a first latch 23 and a second latch 24, and the first latch 23 and the second latch 24 are both fixedly installed on the driving gear 6. When the first latch 23 and the second latch 24 are symmetrically arranged, the scheme is the best scheme in the embodiment. When the driving gear 6 rotates clockwise, the second latch 24 abuts against one end of the second slot 22 close to the second limiting portion 26, and the first latch 23 makes the first limiting block 18 unable to be connected with the first limiting portion 25. When the driving gear 6 rotates counterclockwise, the first latch 23 abuts against one end of the first slot 21 close to the first limiting portion 25, and the second latch 24 makes the second limiting block 19 unable to be connected with the second limiting portion 26. When the driving gear 6 stops rotating, the first limiting portion 25 and the first limiting block 18 cooperate to block the clockwise rotation of the rotating disc 15, and the second limiting portion 26 and the second limiting block 19 cooperate to block the counterclockwise rotation of the rotating disc 15, thereby achieving bidirectional self-locking.

[0043] In the embodiment, the rotating disc 15 is no longer provided with the driving slot 16, and the driving gear 6 is only provided with the first latch 23 and the second latch 24.

[0044] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary technical personnel in the technical field, without departing from the technical principle of the utility model, a number of improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection range of the utility model.

Claims

1. A reducer with bidirectional self-locking, comprising a housing (1), wherein an input shaft (2), an intermediate shaft (4), and an output shaft (3) are rotatably mounted on the housing (1) and driven by a gear set, characterized in that, A groove (13) is positioned inside the housing (1) at the location of the intermediate shaft (4) or the output shaft (3). A turntable (15) coaxially connected to the intermediate shaft (4) or the output shaft (3) is rotatably installed inside the groove (13). An arc-shaped notch is opened on the turntable (15) along the circumferential direction. The notch and the inner wall of the groove (13) form a first groove (21) and a second groove (22). A first limiting block (18) is slidably installed in the first groove (21), and a second limiting block (19) is slidably installed in the second groove (22). The first groove (21) extends counterclockwise. One end of the extension is provided with a first limiting part (25) that can lock the first limiting block (18), and the end of the second groove (22) that extends in a clockwise direction is provided with a second limiting part (26) that can lock the second limiting block (19); a drive gear (6) driven by the input shaft (2) is rotatably mounted on the intermediate shaft (4) or the output shaft (3), and a toggle pin (11) that can push the first limiting block (18) away from the first limiting part (25) or push the second limiting block (19) away from the second limiting part (26) is fixedly mounted on the side of the drive gear (6) near the turntable (15).

2. The reducer with bidirectional self-locking according to claim 1, characterized in that, The first groove (21) is connected to the first limiting part (25) at one end and the second groove (22) is connected to the second limiting part (26) at one end. The pin (11) is located between the first limiting block (18) and the second limiting block (19).

3. The reducer with bidirectional self-locking according to claim 2, characterized in that, The groove (13), turntable (15), and drive gear (6) are all mounted on the intermediate shaft (4). An input gear (5) is fixedly mounted on the input shaft (2), and the input gear (5) meshes with the drive gear (6). An intermediate gear (7) is fixedly mounted on the side of the intermediate shaft (4) away from the turntable (15) of the drive gear (6). An output gear (8) that meshes with the intermediate gear (7) is fixedly mounted on the output shaft (3).

4. The reducer with bidirectional self-locking according to claim 3, characterized in that, The size of the drive gear (6) is larger than that of the input gear (5) and the intermediate gear (7), and the size of the intermediate gear (7) is smaller than that of the output gear (8).

5. The reducer with bidirectional self-locking according to claim 4, characterized in that, The turntable (15) is also provided with a drive groove (16), and a drive pin (12) is fixedly installed on the drive gear (6). The end of the drive pin (12) away from the drive gear (6) is located in the drive groove (16).

6. The reducer with bidirectional self-locking according to claim 5, characterized in that, The drive slot (16) and drive pin (12) are provided in two sets, and the two sets of drive slots (16) and drive pins (12) are symmetrically arranged.

7. The reducer with bidirectional self-locking according to claim 1, characterized in that, The first slot (21) and the second slot (22) are relatively independent; the toggle pin (11) includes a first pin (23) and a second pin (24). When the second pin (24) abuts against the end of the second slot (22) near the second limiting part (26), the first pin (23) prevents the first limiting block (18) from engaging the first limiting part (25); when the first pin (23) abuts against the end of the first slot (21) near the first limiting part (25), the second pin (24) prevents the second limiting block (19) from engaging the second limiting part (26).

8. The reducer with bidirectional self-locking according to claim 1, characterized in that, Both the first limiting block (18) and the second limiting block (19) are cylindrical.

9. The reducer with bidirectional self-locking according to claim 1, characterized in that, The groove (13) is provided with a card slot (14), and a card block (10) that cooperates with the card slot (14) is fixedly installed on the housing (1). The end of the card block (10) away from the housing (1) is inserted into the card slot (14).

10. The reducer with bidirectional self-locking according to any one of claims 1-9, characterized in that, A first spring (17) is provided between the end of the first groove (21) away from the first limiting part (25) and the first limiting block (18), and a second spring (20) is provided between the end of the second groove (22) away from the second limiting part (26) and the second limiting block (19).

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