CN204573091U - Output shaft sealing device and electric actuator - Google Patents

Abstract

The utility model discloses an output shaft sealing device and an electric actuator. The output shaft sealing device comprises an output shaft, a shaft coupling seat, a first bearing and a second bearing. One end of the output shaft is arranged in the shaft coupling seat. Both the bearing and the second bearing are sleeved on the output shaft and are located between the output shaft and the coupling seat. The first bearing and the second bearing are arranged at intervals. The first bearing is used for axially limiting the output shaft. The second bearing is used for radially limiting the output shaft. In this way, the axial and radial directions of the output shaft are limited by the corresponding bearings. Compared with the retaining ring, the limited effect is better, and the parts are reduced, the production cost is reduced, the structure is simple, the assembly is convenient, and the output shaft is effectively avoided. The problem of oil leakage occurs, and the reliability is high.

Description

Output shaft sealing device and electric actuator

technical field

The utility model relates to the technical field of actuators, in particular to an output shaft sealing device and an electric actuator.

Background technique

An actuator is a drive device that can provide linear or rotary motion, utilizes a certain driving energy and works under the action of a certain control signal. Actuators use liquid, gas, electricity or other energy and convert it into driving action through motors, cylinders or other devices. Actuators are widely used in valve control.

Generally, existing actuators include an output shaft 1 and a coupling seat 2, etc. The connection between the output shaft 1 and the coupling seat 2 is shown in Figure 1, and the output shaft 1 is arranged sequentially from top to bottom. There are thrust ball bearings 3, retaining rings 4 and lock nuts 5. An O-ring seal 6 is installed between the retaining ring 4 and the output shaft 1. The O-ring 6 is easily damaged during the assembly process, causing leakage at the output shaft 1. Oil. The axial direction of the output shaft 1 is limited by the thrust ball bearing 3 , the retaining ring 4 and the lock nut 5 , and the radial direction of the output shaft 1 is limited by the thrust ball bearing 3 and the retaining ring 4 . When the output torque of the actuator is large, the retaining ring 4 is likely to rub against the coupling seat 2, and the surface of the retaining ring 4 is damaged to cause oil leakage at the output shaft. The existing sealing structure requires many parts, is difficult to assemble, easily leads to oil leakage at the output shaft, and has low reliability.

Utility model content

The utility model provides an output shaft sealing device and an electric actuator to solve the technical problems that the existing sealing structure requires many parts, is difficult to assemble, easily causes oil leakage at the output shaft and has low reliability.

The technical scheme that the utility model adopts is as follows:

An output shaft sealing device, including an output shaft and a coupling seat, one end of the output shaft is arranged in the coupling seat,

The output shaft sealing device also includes a first bearing for axially limiting the output shaft and a second bearing for radially limiting the output shaft, both the first bearing and the second bearing are sleeved on the output shaft , and located between the output shaft and the coupling seat, the first bearing and the second bearing are arranged at intervals.

Further, the first bearing is a thrust ball bearing.

Further, the second bearing is a deep groove ball bearing.

Further, the second bearing is close to the end of the output shaft for cooperating with the shaft coupling seat.

Further, the output shaft sealing device further includes a shaft end retaining ring, which is arranged between the output shaft and the coupling seat, and is located on the side of the second bearing away from the first bearing.

Further, the output shaft is provided with a first engaging groove for cooperating with the inner ring of the shaft end retaining ring, and the coupling seat is provided with a second engaging groove for mating with the outer ring of the shaft end retaining ring.

Further, the output shaft sealing device further includes a seal arranged between the output shaft and the coupling seat, and the seal is located between the first bearing and the second bearing.

Further, the seal is an oil seal.

According to another aspect of the present utility model, an electric actuator is also provided, including the above-mentioned output shaft sealing device.

The utility model has the following beneficial effects:

1. The output shaft sealing device sets the first bearing and the second bearing, and both the first bearing and the second bearing are sleeved on the output shaft, and are located between the output shaft and the coupling seat. The first bearing is used for The axial limit of the output shaft, the second bearing is used for the radial limit of the output shaft. In this way, the axial and radial directions of the output shaft are limited by the corresponding bearings. Compared with the retaining ring, the limit effect is better, and the number of parts is reduced. The structure is simple, the assembly is convenient, and the oil leakage at the output shaft is effectively avoided. problem, high reliability.

2. The electric actuator adopts the above-mentioned output shaft sealing device, and the axial and radial directions of the output shaft are limited by corresponding bearings. Compared with the retaining ring, the limit effect is better, and the number of parts is also reduced. The structure is simple and easy to assemble. Convenience, effectively avoiding oil leakage inside the electric actuator, and high reliability.

In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. Below with reference to figure, the utility model is described in further detail.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute an improper limitation of the utility model. In the attached picture:

Fig. 1 is a structural schematic diagram of an existing output shaft sealing structure; and

Fig. 2 is a schematic structural view of the output shaft sealing device of the preferred embodiment of the present invention.

Description of reference signs: 10, output shaft; 110, first slot; 20, coupling seat; 210, second slot; 30, first bearing; 40, second bearing; 50, shaft end retaining ring; 60. Seals.

Detailed ways

The embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, but the utility model can be implemented in various ways defined and covered by the claims.

With reference to Fig. 2, the preferred embodiment of the present utility model provides a kind of output shaft sealing device, and output shaft sealing device comprises output shaft 10, coupling seat 20, first bearing 30 and second bearing 40, and output shaft 10 end is provided with In the coupling seat 20, the first bearing 30 and the second bearing 40 are sleeved on the output shaft 10, and are located between the output shaft 10 and the coupling seat 20, and the first bearing 30 and the second bearing 40 are separated by Arranged, the first bearing 30 is used for axially limiting the output shaft 10 , and the second bearing 40 is used for radially limiting the output shaft 10 . In this way, the axial and radial directions of the output shaft 10 are limited by the corresponding bearings. Compared with the stop ring, the limited effect is better, and the parts are reduced, the production cost is reduced, the structure is simple, the assembly is convenient, and the output shaft is effectively avoided. There are 10 oil leakage problems, and the reliability is high. In addition, when the output torque of the actuator is large, the first bearing 30 and the second bearing 40 can bear a large load, effectively avoiding the tilting or jumping of the output shaft 10 , the sealing effect is good, and the adjustment accuracy of the actuator is improved.

Referring to FIG. 2 , in this preferred embodiment, optionally, in order to ensure the stability of the axial limit of the output shaft 10 , the first bearing 30 may be a thrust ball bearing. Thrust ball bearings can withstand thrust loads at high speeds, and consist of washer-like rings with raceway grooves for ball rolling to withstand axial loads. Among them, the thrust ball bearing is a mature component in the field of bearing equipment technology, and its structure and working principle will not be repeated here. Optionally, in order to ensure the stability of the radial limit of the output shaft 10, the second bearing 40 may be a deep groove ball bearing. The deep groove ball bearing is suitable for high-speed operation, durable and does not require frequent maintenance. The friction coefficient of the deep groove ball bearing is small, which reduces the possibility of deep groove ball bearing wear and prevents oil leakage at 10 places on the output shaft. The structure is simple and easy to manufacture. Low cost, mainly used to bear radial load. Among them, the deep groove ball bearing is a mature component in the field of bearing equipment technology, and its structure and working principle will not be repeated here.

Referring to FIG. 2 , in this preferred embodiment, optionally, the second bearing 40 is close to the end of the output shaft 10 for cooperating with the coupling seat 20 . As shown in FIG. 2 , the first bearing 30 is located above the second bearing 40 , and the second bearing 40 is located at the lower end of the output shaft 10 . In this way, when the output shaft 10 rotates at high speed, the end of the output shaft 10 is more prone to radial shaking, so the second bearing 40 is arranged on the end of the output shaft 10 for matching with the coupling seat 20 to ensure the output Radial shaking does not occur at the end of the shaft 10, thereby ensuring the stability of the output shaft 10 in operation and high reliability. Optionally, the output shaft sealing device further includes a shaft end retaining ring 50 , the shaft end retaining ring 50 is arranged between the output shaft 10 and the coupling seat 20 and is located on the side of the second bearing 40 away from the first bearing 30 . The shaft end retaining ring 50 is suitable for the positioning and fixing of shaft end parts, and can withstand severe vibration and impact loads. In this embodiment, the shaft end retaining ring 50 can position and fix the second bearing 40 to further ensure the stability of the structure, prevent oil leakage at the output shaft 10 , and have high reliability. Among them, the shaft end retaining ring 50 is a mature component in the technical field of shaft end retaining parts, and its structure and working principle will not be repeated here. Optionally, the output shaft 10 is provided with a first card slot 110 , and the coupling seat 20 is provided with a second card slot 210 , the inner ring of the shaft end stop ring 50 fits with the first card slot 110 , and the outer ring matches with the second card slot 110 . The two clamping grooves 210 cooperate to realize the retaining installation of the shaft end retaining ring 50, which has a simple structure, convenient assembly and high reliability.

Referring to FIG. 2 , in this preferred embodiment, optionally, the output shaft sealing device further includes a seal 60 disposed between the output shaft 10 and the coupling seat 20, and the seal 60 is located between the first bearing 30 and the second bearing. between bearings 40. The arrangement of the sealing member 60 realizes the sealing of the output shaft 10, effectively prevents oil leakage at the output shaft 10, and has high reliability. Optionally, the seal 60 may be an oil seal. The oil seal is a mechanical element used to seal oil. It isolates the parts that need to be lubricated from the output parts in the transmission parts and prevents the leakage of lubricating oil. Oil seals can also be called lip seals. In this way, the oil seal is used instead of the O-ring, the probability of damage is small, the sealing effect is improved, oil leakage at the output shaft 10 is effectively prevented, and the reliability is high.

Referring to Fig. 2, another aspect of the utility model also provides an electric actuator, which includes the above-mentioned output shaft sealing device. The use of the output shaft sealing device improves the limiting effect of the output shaft 10 and reduces the number of components. The structure is simple, the assembly is convenient, the oil leakage problem inside the electric actuator is effectively avoided, and the reliability is high.

From the above description, it can be seen that the above-mentioned embodiments of the utility model have achieved the following technical effects:

According to the output shaft sealing device and electric actuator of the present utility model, by setting the first bearing 30 and the second bearing 40, the first bearing 30 and the second bearing 40 are both sleeved on the output shaft 10, and are located on the output shaft 10. Between the coupling seat 20 , the first bearing 30 is used for axially limiting the output shaft 10 , and the second bearing 40 is used for radially limiting the output shaft 10 . In this way, the axial and radial directions of the output shaft 10 are limited by the corresponding bearings. Compared with the retaining ring, the limited effect is better, and the parts are reduced. The structure is simple, the assembly is convenient, and the leakage inside the electric actuator can be effectively avoided. Oil problem, high reliability.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (9)

1. An output shaft sealing device, comprising an output shaft (10) and a coupling seat (20), one end of the output shaft (10) is arranged in the coupling seat (20), characterized in that, The output shaft sealing device further includes a first bearing (30) for axially limiting the output shaft (10) and a second bearing for radially limiting the output shaft (10) (40), the first bearing (30) and the second bearing (40) are sleeved on the output shaft (10), and are located between the output shaft (10) and the coupling seat Between (20), the first bearing (30) and the second bearing (40) are arranged at intervals. 2. The output shaft sealing device according to claim 1, characterized in that: The first bearing (30) is a thrust ball bearing. 3. The output shaft sealing device according to claim 1, characterized in that: The second bearing (40) is a deep groove ball bearing. 4. The output shaft sealing device according to claim 1, characterized in that: The second bearing (40) is close to the end of the output shaft (10) for cooperating with the shaft coupling seat (20). 5. The output shaft sealing device according to claim 4, characterized in that, The output shaft sealing device also includes a shaft end retaining ring (50), the shaft end retaining ring (50) is arranged between the output shaft (10) and the coupling seat (20), and is located on the The side of the second bearing (40) away from the first bearing (30). 6. The output shaft sealing device according to claim 5, characterized in that, The output shaft (10) is provided with a first slot (110) for cooperating with the inner ring of the shaft end retaining ring (50), and the coupling seat (20) is provided with a slot for cooperating with the shaft end The second card slot (210) fitted with the outer ring of the retaining ring (50). 7. The output shaft sealing device according to claim 1, characterized in that, The output shaft sealing device also includes a seal (60) arranged between the output shaft (10) and the coupling seat (20), and the seal (60) is located at the first bearing ( 30) and the second bearing (40). 8. The output shaft sealing device according to claim 7, characterized in that, The seal (60) is an oil seal. 9. An electric actuator, characterized by comprising the output shaft sealing device according to any one of claims 1-8.