Speed reducer

Abstract

The speed reducer comprises a driving component, a multi-stage gear assembly and a planetary roller push rod assembly, and the driving component comprises a motor and an input shaft; the axis of each stage of gear of the multi-stage gear assembly is parallel to the input shaft, and the last stage of gear is set to reduce the gear diameter by reducing the number of teeth of the gear; the planetary roller push rod assembly comprises a lead screw, a roller, a nut body and a push rod sleeve, the lead screw serves as an output shaft and is driven by the multi-stage gear assembly, and the nut body and the push rod sleeve are driven by the roller to complete linear motion. The size of the speed reducer can be reduced on the premise that the bearing capacity is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of transmission devices, in particular to the field of reducers. Background Art

[0002] Traditional quay cranes generally use worm gear transmission pairs and ball screw reducers in the automatic anti-twist mechanism of quay cranes. The worm gear reducer has low transmission efficiency, poor lubrication effect, poor maintenance, and unguaranteed service life. Imported reducers are more expensive. Due to the limited size of the automated quay crane trolley frame, it is necessary to minimize the size of the reducer while ensuring the load-bearing capacity. Utility Model Content

[0003] One purpose of the utility model is to provide a reducer with higher load-bearing capacity and smaller volume.

[0004] To achieve the above-mentioned purpose, the reducer includes a driving component, a multi-stage gear assembly and a planetary roller push rod assembly, the driving component includes a motor and an input shaft; the axes of the gears of each stage of the multi-stage gear assembly are parallel to the input shaft, and the last stage is configured to reduce the gear diameter by reducing the number of gear teeth; the planetary roller push rod assembly includes a screw, a roller, a nut body and a push rod sleeve, the screw serves as an output shaft and receives the drive of the multi-stage gear assembly, and drives the nut body and the push rod sleeve through the rollers arranged in a planetary structure to complete forward and backward linear motion.

[0005] In one embodiment, the reducer also includes a housing for mounting the multi-stage gear assembly and a connecting seat for mounting the planetary roller push rod assembly, and the housing and the connecting seat are both provided with viewing windows for observing the multi-stage gear assembly and / or the planetary roller push rod assembly.

[0006] In one embodiment, it is characterized in that the multi-stage gear assembly includes a first gear set, a second gear set, a third gear set, and a first transmission shaft and a second transmission shaft; the first gear set is configured to be driven by the input shaft, the first transmission shaft is configured to be driven by the first gear set, the second gear set is configured to be driven by the first transmission shaft, the second transmission shaft is configured to be driven by the second gear set, the third gear set is configured to be driven by the second transmission shaft, and the screw is configured to be driven by the third gear set.

[0007] In one embodiment, the planetary roller push rod assembly is used to connect an anti-torsion device.

[0008] In one or more embodiments, a protective cover is provided on the outside of the screw rod and the nut body.

[0009] In one or more embodiments, the protective cover serves as the connecting socket.

[0010] In one or more embodiments, the reducer further includes an encoder.

[0011] The above reducer adopts the planetary roller push rod assembly as the output end, which has the characteristics of high load-bearing capacity and impact resistance. Under the condition of the same thrust, the size of the screw pair can be reduced; at the same time, by reducing the number of teeth of the last stage of the sub-gear, the diameter of the last stage of the gear is reduced, so that the overall height of the entire reducer is reduced while ensuring the load-bearing capacity, and the volume of the reducer is reduced; the reducer box adopts two lubrication methods to lubricate separately, which improves reliability and maintainability. Under the premise of ensuring that the use functions are exactly the same, the above reducer can completely replace the imported reducer box, with reduced costs, convenient production, and a shorter delivery cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0013] Figure 1 It is a schematic diagram of the transmission principle of the reducer;

[0014] Figure 2 is a schematic diagram of a viewing window. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0016] It should be noted that these and other subsequent drawings are only examples and are not drawn in proportion, and should not be used as a limitation on the actual scope of protection required by the present utility model.

[0017] Reference Figure 1 As shown, the reducer includes a driving component 1, a multi-stage gear assembly 3 and a planetary roller push rod assembly 5. In some embodiments, the reducer further includes an encoder 4 for measuring the rotational position and measuring the speed.

[0018] Specifically, the driving component 1 includes a motor 11, an input shaft 12 and a connecting flange 13, and is used to input driving force to the multi-stage gear assembly 3. The connecting flange 13 connects the driving component 1 and the multi-stage gear assembly 3.

[0019] The axes of the gears of each stage of the multi-stage gear assembly 3 are parallel to the input shaft 12. The planetary roller push rod assembly 5 includes rollers (not shown in the figure), a nut body 52, a screw 51 and a push rod sleeve 55. The screw 51 serves as an output shaft and receives the drive of the multi-stage gear assembly 3, and drives the nut body 52 and the push rod sleeve 55 to complete forward and backward linear motion through the rollers arranged in a planetary structure.

[0020] Specifically, in Figure 1 In the embodiment shown, the reduction gearbox transmission adopts a three-stage parallel shaft reduction transmission. The multi-stage gear assembly includes, from top to bottom, a first gear set 31, a second gear set 32, a third gear set 33, a first transmission shaft 34, and a second transmission shaft 35. The input shaft 12, the first transmission shaft 34, and the second transmission shaft 35 are supported by bearings 2.

[0021] The first gear set 31 includes a main gear and a sub gear, the main gear is supported on the input shaft 12 and is configured to receive the drive of the input shaft 12 to rotate. The sub gear is driven to rotate by the main gear 31. The sub gear is supported on the first transmission shaft 34, and the first transmission shaft 34 is configured to be driven by the sub gear of the first gear set.

[0022] The second gear set 32 ​​includes a main gear and a sub-gear, and the main gear is supported on the first transmission shaft 34. Under the drive of the first transmission shaft 34, the main gear of the second gear set 32 ​​rotates and drives the sub-gear of the second gear set 32 ​​to rotate. The sub-gear of the second gear set 32 ​​is supported on the second transmission shaft 35. Therefore, the second transmission shaft 35 is configured to be driven by the sub-gear of the second gear set, and then drives the main gear N of the third gear set 33 to rotate.

[0023] The main gear N of the third gear set 33 drives the sub gear P of the third gear set 33 to rotate, and the screw of the planetary roller push rod assembly 5 is configured to be driven to rotate by the sub gear of the third gear set.

[0024] Under the premise of ensuring that the module of the last gear stage remains unchanged, by reducing the number of teeth of the gear P, the diameter of the auxiliary gear P of the third gear set 33 can be reduced, thereby reducing the height and volume of the entire reduction box, thereby reducing the size of the gear box.

[0025] Traditional reduction structures generally use worm gears and ball screws, which have low transmission efficiency, poor lubrication, poor maintenance, and unguaranteed service life. The present invention uses a multi-stage gear assembly and a planetary roller push rod assembly to provide a higher load-bearing capacity and transmission efficiency.

[0026] Reference Figure 1As shown, the planetary roller push rod assembly 5 includes a screw 51, a nut body 52, and a plurality of rollers and push rod sleeves 55 arranged in a planetary structure between the nut body and the screw. The rollers arranged in the planetary structure are in rolling engagement with the nut body and the screw, and the nut body 52 realizes forward and backward linear motion on the screw 51. The screw 51 rotates as an output shaft under the drive of the multi-stage gear assembly, and the push rod sleeve 55 connected to the nut body is used to connect components such as anti-torsion devices. In the automated operation of the quay crane, the anti-torsion device plays a pivotal role. The use of planetary roller push rods can have a higher load-bearing capacity, and can reduce the size of the screw pair under the condition of the same thrust, thereby further reducing the size of the reduction box.

[0027] The output adopts a planetary roller push rod structure, which has the advantages of higher load capacity, higher impact resistance and longer life. Therefore, by adopting a planetary roller push rod assembly with a reduced diameter design of the last gear stage, the purpose of reducing the volume can be achieved while meeting the load force.

[0028] In some embodiments, the screw 51 serves as an output shaft and receives the drive of the multi-stage gear assembly 3, and drives the nut body 52 and the push rod sleeve 55 through the rollers arranged in a planetary structure to complete the forward and backward linear motion. Preferably, a protective sleeve 54 is also provided on the outside of the screw 51 and the nut body 52 to prevent external pollution from entering the planetary roller push rod assembly.

[0029] Continue to refer to Figure 2 As shown, the reducer further includes a housing 101 for mounting the multi-stage gear assembly and a connecting seat 103 for mounting the planetary roller push rod assembly.

[0030] In the embodiment shown in the drawings, the protective cover 54 for protecting the screw rod 51 and the nut body 52 is also installed on the mechanism as a connecting seat 103. The protective cover 54 is installed on the mechanism as a connecting seat and can also protect the screw rod and the nut body from external contamination.

[0031] Preferably, both the box body 101 and the connecting seat 103 are provided with a viewing window 101 for observing the multi-stage gear assembly and the planetary roller push rod assembly.

[0032] In addition to the grease lubrication points, the connection seat has a viewing window 101 to facilitate the later application of grease to ensure the lubrication of the screw pair. The inside of the reduction gearbox body is lubricated with oil bath to ensure that the bearings and oil seals are fully lubricated. Therefore, the entire reduction gearbox is lubricated by two lubrication methods, which can improve reliability, extend service life, and facilitate later maintenance.

[0033] The above reducer has higher load-bearing capacity, impact resistance, long life and small size. Specifically, the advantages include the following: the planetary roller push rod assembly is used as the output end, which has the characteristics of high load-bearing and impact resistance, and can reduce the size of the screw pair under the condition of equal thrust; at the same time, by reducing the number of teeth of the last stage of the sub-gear, the diameter of the last stage of the gear is reduced, so that the overall height of the entire reducer is reduced while ensuring the load-bearing capacity, and the size of the reducer is reduced; the reducer box adopts two lubrication methods to lubricate separately, which improves reliability and maintainability.

[0034] On the premise of ensuring that the functions are exactly the same, the reducer described in this application can completely replace imported reducer boxes, with reduced costs, convenient production, and a shorter delivery cycle.

[0035] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0036] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0037] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A reducer, characterized in that: include: drive components, including the motor and input shaft; A multi-stage gear assembly, wherein the axes of the gears of each stage are parallel to the input shaft, and the last stage is configured to reduce the gear diameter by reducing the number of gear teeth; The planetary roller push rod assembly comprises a screw, a roller, a nut body and a push rod sleeve. The screw serves as an output shaft and receives the drive of the multi-stage gear assembly, and drives the nut body and the push rod sleeve to complete linear motion through rollers arranged in a planetary structure.

2. The reducer according to claim 1, characterized in that: The reducer also includes a housing for mounting the multi-stage gear assembly and a connecting seat for mounting the planetary roller push rod assembly. Both the housing and the connecting seat are provided with viewing windows for observing the multi-stage gear assembly and / or the planetary roller push rod assembly.

3. The reducer according to claim 1, characterized in that The multi-stage gear assembly includes a first gear set, a second gear set, a third gear set, and a first transmission shaft and a second transmission shaft; the first gear set is configured to be driven by the input shaft, the first transmission shaft is configured to be driven by the first gear set, the second gear set is configured to be driven by the first transmission shaft, the second transmission shaft is configured to be driven by the second gear set, the third gear set is configured to be driven by the second transmission shaft, and the screw is configured to be driven by the third gear set.

4. The reducer according to claim 1, characterized in that: The planetary roller push rod assembly is used to connect the anti-torsion device.

5. The reducer according to claim 2, characterized in that: A protective sleeve is arranged outside the screw rod and the nut body.

6. The reducer according to claim 5, characterized in that: The protective cover serves as the connecting seat.

7. The reducer according to claim 1, characterized in that: The reducer also includes an encoder.

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