CN213479064U - Torque protection device of transmission structure - Google Patents

Abstract

The utility model relates to a drive mechanism field provides a transmission structure moment protection device, include: the worm wheel is installed on the main shaft and in clearance fit with the main shaft, the worm wheel is matched with the worm, the main shaft is located, one side of the worm wheel is provided with a limiting portion, the main shaft is further provided with an elastic element, and the worm wheel is connected to the limiting portion in a propping mode under the action of the elastic element and reaches the upper limit of torque. The torque protection device for the transmission structure can limit safe torque, effectively protect the transmission structure and prolong the service life of the transmission structure.

Description

Torque protection device of transmission structure

Technical Field

The utility model relates to a drive mechanism field especially relates to a transmission structure moment protection device.

Background

In some mechanical transmission structures, a worm wheel and a worm are often used in a matched mode, the worm is connected with a driving mechanism, the worm wheel is externally connected with a load through a main shaft, when the driving torque borne by the worm wheel is overlarge, the load can be damaged, when the load is overlarge, teeth on the worm wheel and the worm can be damaged, or the driving mechanism is damaged, and the transmission structure is scrapped when the load is serious.

Based on the above situation, there is a need for a torque protection device for a transmission structure, which can solve the above problems at least to some extent.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a transmission structure moment protection device can carry out safe moment and prescribe a limit to, effectively protects transmission structure, extension transmission structure life.

To achieve the purpose, on one hand, the utility model adopts the following technical scheme:

a drive structure torque protection device, comprising: the worm wheel is installed on the main shaft and in clearance fit with the main shaft, the worm wheel is matched with the worm, the main shaft is located, one side of the worm wheel is provided with a limiting portion, the main shaft is further provided with an elastic element, and the worm wheel is connected to the limiting portion in a propping mode under the action of the elastic element and reaches the upper limit of torque.

Preferably, the limiting part is a shaft shoulder integrally formed with the main shaft, the shaft shoulder and the main shaft are coaxially arranged, and the diameter of the shaft shoulder is larger than that of the main shaft.

Preferably, the elastic element is arranged on one side of the worm wheel far away from the limiting part.

Preferably, the elastic element is a disc spring.

Preferably, a clamping nut is arranged on one side, away from the worm wheel, of the elastic element part.

Preferably, a first friction mechanism is arranged between the limiting part and the worm wheel.

Preferably, a second friction mechanism is arranged between the elastic element and the worm wheel.

Preferably, the first friction mechanism is a friction plate fixed on the end face of one side of the limiting part, which is close to the worm wheel.

Preferably, the first friction mechanism is a friction surface provided on an end surface of the stopper portion facing the worm wheel, or the first friction mechanism is a friction surface provided on an end surface of the worm wheel facing the stopper portion.

Preferably, the second friction mechanism is a friction plate fixed at one end of the elastic element close to the worm wheel.

The utility model has the advantages that: the torque protection device for the transmission structure can limit safe torque, effectively protect the transmission structure and prolong the service life of the transmission structure.

Drawings

Fig. 1 is a schematic sectional view of an embodiment of the torque protection device of the middle transmission structure of the present invention.

Fig. 2 is the schematic view of the installation structure of the middle worm wheel and the main shaft of the present invention.

The device comprises a main shaft 1, a worm wheel 2, a worm 3, a limiting part 4, an elastic element 5, a clamping nut 6, a first friction mechanism 7, a second friction mechanism 8, a first shell 9 and a second shell 10.

Detailed Description

In order to further understand and appreciate the structural features and advantages of the present invention, preferred embodiments and the accompanying drawings are described in detail as follows:

referring to fig. 1 and 2, a torque protection device for a transmission structure includes: main shaft 1, worm wheel 2, worm 3, worm wheel 2 installs on main shaft 1 and with 1 clearance fit of main shaft, worm wheel 2 with worm 3 cooperatees, lie in on the main shaft 1 one side of worm wheel 2 is provided with spacing portion 4, still be provided with elastic element 5 on the main shaft 1, worm wheel 2 is in under elastic element 5's the effect support even spacing portion 4 is gone up and is reached the torque upper limit.

In some embodiments, with continuing reference to fig. 1 and 2, the protection device further includes a first housing 9 for mounting the spindle 1, and a second housing 10 for mounting the worm, wherein the spindle 1 is rotatably mounted on the first housing 9, and at least one end of the protection device is located outside the first housing 9 for connecting a load, the load of the present invention refers to a mechanism that is connected to the spindle 1 and driven by the spindle 1, such as a mechanism that rotates along with the spindle 1. The worm wheel 2, the elastic element 5 and the second housing 10 are all mounted inside the first housing 9, the worm 3 is rotatably mounted inside the second housing 10, the worm 3 is driven by a driving motor (not shown), the worm 3 is engaged with the worm wheel 2, the worm wheel 2 is driven to rotate when the worm 3 rotates, the worm wheel 2 is engaged with the spindle 1, the limit part 4 is fixed on the spindle 1, the worm wheel 2 is abutted against the limit part 4 under the action of the elastic element 5 and reaches an upper torque limit, a friction force exists between the worm wheel 2 and the spindle 1 and between the worm wheel 2 and the elastic element 5, when the worm wheel 2 rotates, the spindle 1 is driven to rotate, and when the driving torque applied to the worm wheel 2 exceeds the maximum friction surface torque due to the clearance fit between the worm wheel 2 and the spindle 1, the worm wheel 2 will slip on the spindle 1, as the worm wheel 2 idles, carrying a dead load. At this time, the output torque of the driving motor at the end of the worm 3 does not rise any more and reaches the maximum, so that the driving motor can be prevented from being overloaded. When the power is off, when the external torque applied to the end of the main shaft 1 exceeds the maximum torque of the friction surface, the main shaft 1 and the elastic element 5 slip on the end surface of the worm wheel 2, and the worm 3 can be prevented from bearing excessive axial force to cause damage to worm gear teeth or worm teeth; the spindle can be manually rotated, so that the testing and inspection, packaging and carrying of the mechanism are facilitated.

In some embodiments, referring to fig. 2, the position-limiting portion 4 is a shoulder formed integrally with the main shaft 1, the shoulder is disposed coaxially with the main shaft 1, and the diameter of the shoulder is larger than that of the main shaft 1.

In some embodiments, with continued reference to fig. 2, the resilient element 5 is disposed on a side of the worm wheel 2 remote from the stopper 4. The elastic element is always in a compression state, and the worm wheel 2 is pressed on the end face of the limiting part 4. In other embodiments (not shown in the figures), the elastic element 5 is arranged on the same side of the worm wheel 2 and the limiting part 4, the elastic element 5 is always in a stretching state, and the worm wheel 2 is tensioned to enable the worm wheel 2 to abut against the end face of the limiting part 4.

In some embodiments, with continued reference to fig. 2, the resilient element 5 is a disc spring. The elastic element 5 is a disc spring or a plurality of disc springs used in a superposed manner, and the combination and pairing mode of the plurality of disc springs can be determined according to product parameters and tests, which are not described herein again.

In some embodiments, with continued reference to fig. 2, the side of the resilient element 5 remote from the worm wheel 2 is provided with a clamping nut 6. The clamping nut 6 is preferably a special nut matched with the disc spring, and the clamping force, the elastic deformation amount and the friction surface torque range of the clamping nut 6 on the disc spring can also be determined through tests, which is not described herein again.

In some embodiments, with continued reference to fig. 2, a first friction mechanism 7 is provided between the stopper 4 and the worm wheel 2. Through setting up first friction mechanism 7, conveniently set up according to the demand spacing portion 4 with the size of frictional force between the worm wheel 2.

In some embodiments, with continued reference to fig. 2, a second friction mechanism 8 is provided between the resilient element 5 and the worm gear 2. Through setting up second friction mechanism 8, conveniently set up according to the demand the size of elastic element 5 with frictional force between worm wheel 2.

In some embodiments, with continued reference to fig. 2, the first friction mechanism 7 is a friction plate fixed on an end surface of the limiting portion 4 on a side close to the worm wheel 2. The friction plate is made of a conventional metal friction plate, a ceramic friction plate, a high polymer material friction plate or other conventional materials, and is not limited herein.

In some embodiments, the first friction mechanism 7 is a friction surface provided on an end surface of the stopper portion 4 facing the worm wheel 2, or the first friction mechanism 7 is a friction surface provided on an end surface of the worm wheel 2 facing the stopper portion 4. And carrying out surface treatment on the end surface of the limiting part 4 facing the worm wheel 2 to form a first friction mechanism 7, or fixing the first friction mechanism 7 on the end surface of the worm wheel 2 close to one side of the limiting part 4, or carrying out surface treatment on the end surface of the worm wheel 2 facing the limiting part 4 to form the first friction mechanism 7. Of course, the first friction mechanism 7 can be disposed on both the limiting portion 4 and the worm wheel 2, and the disposing manner is the same as that described above, and is not described herein again.

In some embodiments, with continued reference to fig. 2, the second friction mechanism 8 is a friction plate fixed to an end of the elastic element 5 near the worm wheel 2. The friction plate is made of a conventional metal friction plate, a ceramic friction plate, a high polymer material friction plate or other conventional materials, and is not limited herein. In other embodiments, the second friction mechanism 8 is a friction plate fixed on the end surface of the worm wheel 2 near the elastic element 5, or the end surface of the worm wheel 2 facing the elastic element 5 is surface-treated to form the second friction mechanism 8. Of course, the elastic element 5 and the worm wheel 2 can be provided with the second friction mechanism 8 in the same manner as described above, and the description thereof is omitted.

The utility model discloses well worm gear possesses the auto-lock performance, can only worm drive worm wheel rotate. The worm wheel is in clearance fit with the central hole of the main shaft, and the worm wheel can be pushed to rotate by hand on the main shaft. The disc spring clamping worm wheel is adopted to carry out safe torque limitation on the self-locking worm wheel and worm main shaft, so that the driving motor can be effectively protected from overload burning; and can carry out artificial reverse rotation to the main shaft when the outage to conveniently test the mechanism, pack transport etc.. The parts required by the disc spring clamping worm gear are simple to manufacture and easy to obtain, the generated friction torque value is easy to control and measure, and mass production can be realized. The torque protection device for the transmission structure can limit safe torque, effectively protect the transmission structure and prolong the service life of the transmission structure.

The parts not related to in the present invention are all the same as or can be realized by adopting the prior art, and are not repeated herein.

Finally, it should be noted that: in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "vertical", "horizontal", etc. indicate that the directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and understanding of the technical solutions of the present invention, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A drive structure torque protection device, comprising: the worm wheel is installed on the main shaft and in clearance fit with the main shaft, the worm wheel is matched with the worm, the main shaft is located, one side of the worm wheel is provided with a limiting portion, the main shaft is further provided with an elastic element, and the worm wheel is connected to the limiting portion in a propping mode under the action of the elastic element and reaches the upper limit of torque.

2. The torque protection device for the transmission structure according to claim 1, wherein the limiting portion is a shoulder integrally formed with the main shaft, the shoulder is coaxially disposed with the main shaft, and the diameter of the shoulder is larger than that of the main shaft.

3. The torque protection device of claim 1, wherein the resilient element is disposed on a side of the worm gear remote from the limiting portion.

4. A drive structure torque protector according to claim 3 wherein the resilient element is a disc spring.

5. A drive configuration torque protector according to claim 4 wherein the side of the resilient element remote from the worm gear is provided with a clamping nut.

6. The torque protection device of claim 1, wherein a first friction mechanism is disposed between the limiting portion and the worm gear.

7. A drive configuration torque protector according to claim 3 wherein a second friction means is provided between the resilient element and the worm gear.

8. The torque protection device of claim 6, wherein the first friction mechanism is a friction plate fixed on one side end surface of the limiting portion close to the worm wheel.

9. A transmission torque protector according to claim 6 in which the first friction means is a friction surface provided on the end face of the limit portion facing the worm wheel, or the first friction means is a friction surface provided on the end face of the worm wheel facing the limit portion.

10. A drive configuration torque protector according to claim 7 wherein the second friction means is a friction plate secured to the resilient element adjacent the worm gear.

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