A high overload resistant steering gear

Abstract

The utility model provides a high overload resistant steering gear, comprising a housing, wherein a motor, a screw, a stroke nut, a slide rail, a shift fork and an output shaft are arranged inside the housing, and the two ends of the screw are mounted on the housing through bearings; the output end of the motor is connected to the screw for driving the screw to rotate; the stroke nut is connected to the screw through a threaded pair, and a slider is arranged on the outer side of the stroke nut, and the slider is slidably connected to the slide rail; one end of the shift fork is connected to the output shaft, and the other end is connected to the stroke nut. The utility model drives the screw to rotate by a motor, so that the stroke nut moves linearly along the slide rail, drives the shift fork to swing, and thus drives the output shaft to rotate, and the force generated by the screw and the output shaft due to high overload is loaded by the bearing, and the deformation generated is absorbed by the clearance of the mounting bearing, which can effectively avoid the problem of failure of the steering gear caused by deformation between the mating part and the threaded pair due to high overload.

Description

Technical Field

[0001] The present application relates to the technical field of steering gears, and in particular to a high overload resistant steering gear. Background Art

[0002] With the vigorous development of aerospace technology, the requirements for the overall performance of servos are getting higher and higher, which has prompted servos to develop in the direction of continuously reducing volume and mass, continuously increasing load-bearing capacity, and continuously improving control performance. Servo is generally composed of motor, controller, driver, reduction transmission mechanism, rudder surface locking and deployment mechanism. It has attracted widespread attention and in-depth research due to its simple and reliable, good processability, easy use and maintenance, single energy, low cost, and easy control, and has been widely used in the aerospace field.

[0003] With the diversification of the use of servos, it is necessary to develop low-cost and miniaturized electric servos. Due to cost and volume restrictions, the overload resistance of servos is limited accordingly. When the servo is in operation, the internal transmission components may be deformed and stuck, which may lead to failure of the servo. Summary of the invention

[0004] The present application provides a high-overload resistant servo, which solves the problem that the internal transmission components may be deformed and stuck due to an instantaneous high overload condition during the operation of the servo, thereby causing the servo to fail.

[0005] The present application provides a high-overload resistant servo, comprising a housing, wherein a motor, a lead screw, a stroke nut, a slide rail, a shift fork and an output shaft are arranged inside the housing, and both ends of the lead screw are mounted on the housing through bearings; the output end of the motor is connected to the lead screw for driving the lead screw to rotate; the stroke nut is connected to the lead screw through a threaded pair, a slider is provided on the outer side of the stroke nut, and the slider is slidably connected to the slide rail; one end of the shift fork is connected to the output shaft, and the other end is connected to the stroke nut.

[0006] In the technical solution provided in the present application, the motor drives the lead screw to rotate, causing the travel nut to move linearly along the slide rail, driving the shift fork to swing, thereby driving the output shaft to rotate. The force generated by the lead screw and the output shaft due to high overload is borne by the bearings, and the deformation generated is absorbed by the clearance of the mounting bearings, which can effectively avoid the problem of failure of the servo due to deformation between the mating parts of the servo and the threaded pair due to high overload.

[0007] In some embodiments, a first bevel gear is installed at the output end of the motor, and a second bevel gear meshing with the first bevel gear is installed on the screw rod; through the cooperation of the first bevel gear and the second bevel gear, the axial movement generated by the motor is changed in direction and transmitted to the laterally arranged screw rod and the output shaft, and the screw rod and the output shaft are both installed on the housing through bearings, which can avoid high overload from being transmitted to the motor, thereby protecting the motor.

[0008] In some embodiments, the shift fork includes a sleeve and a U-shaped frame, and the sleeve is connected to the U-shaped frame through a swing arm; the sleeve is sleeved on the output shaft to drive the output shaft to rotate; a slot is provided on the side plate of the U-shaped frame, and a clamping column that cooperates with the slot is provided on the side of the travel nut; when the travel nut slides linearly along the slide rail, the clamping columns on both sides are clamped in the slot of the U-shaped frame, thereby driving the U-shaped frame to swing around the axis of the sleeve, and then driving the output shaft to rotate.

[0009] In some embodiments, the shaft hole of the sleeve is a non-circular hole to avoid relative rotation between the sleeve and the output shaft.

[0010] In some embodiments, an adjusting nut is provided on the outer side of the bearing, and the adjusting nut is connected to the screw rod through a threaded pair. The adjusting nut is used to adjust the bearing clearance to avoid the problem of excessive bearing clearance causing reduced displacement accuracy of the stroke nut or excessive bearing clearance causing jamming.

[0011] In some embodiments, a washer is provided between the inner ring of the bearing and the adjusting nut, so as to prevent the adjusting nut from directly contacting the bearing and protect the bearing.

[0012] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings in this application are used to illustrate preferred embodiments, so that those skilled in the art can clearly understand various other advantages and benefits, and should not be considered as limitations of this application. In addition, the same reference numerals are used throughout the drawings to represent the same or similar components.

[0014] Figure 1 This is a schematic diagram of the internal structure of a high overload resistant servo in one embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of the external structure of a high overload resistant steering gear in one embodiment of the present application;

[0016] Figure 3 This is a schematic diagram of the assembly structure of the shift fork and the travel nut in one embodiment of the present application;

[0017] Figure 4 This is a schematic diagram of the assembly structure of the adjusting nut and the bearing in one embodiment of the present application;

[0018] Icons: 1. Housing; 2. Motor; 3. Screw; 4. Travel nut; 5. Slide rail; 6. Fork; 7. Output shaft; 8. Bearing; 9. Slider; 10. First bevel gear; 11. Second bevel gear; 12. Bushing; 13. U-shaped frame; 14. Swing arm; 15. Slot; 16. Column; 17. Adjusting nut; 18. Washer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0022] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0024] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0025] See also Figure 1-Figure 4 The embodiment of the present application provides a high overload resistant servo, including a housing 1, wherein a motor 2, a screw rod 3, a stroke nut 4, a slide rail 5, a shift fork 6 and an output shaft 7 are arranged inside the housing 1, and both ends of the screw rod 3 are mounted on the housing 1 through bearings 8; the output end of the motor 2 is connected to the screw rod 3 for driving the screw rod 3 to rotate; the stroke nut 4 is connected to the screw rod 3 through a threaded pair, and a slider 9 is provided on the outer side of the stroke nut 4, and the slider 9 is slidably connected to the slide rail 5; one end of the shift fork 6 is connected to the output shaft 7, and the other end is connected to the stroke nut 4.

[0026] In the technical solution provided in the present application, the motor 2 drives the screw rod 3 to rotate, so that the travel nut 4 is linearly displaced along the slide rail 5, driving the fork 6 to swing, thereby driving the output shaft 7 to rotate, and the force generated by the screw rod 3 and the output shaft 7 due to high overload is loaded by the bearing 8, and the deformation generated is absorbed by the clearance of the mounting bearing 8, which can effectively avoid the problem of failure of the steering gear caused by deformation between the mating parts of the steering gear and the threaded pair due to high overload.

[0027] Please continue reading Figure 1In some embodiments, a first bevel gear 10 is installed at the output end of the motor 2, and a second bevel gear 11 meshing with the first bevel gear 10 is installed on the screw rod 3; through the cooperation of the first bevel gear 10 and the second bevel gear 11, the axial movement generated by the motor 2 is changed in direction and transmitted to the laterally arranged screw rod 3 and the output shaft 7. The screw rod 3 and the output shaft 7 are both installed on the housing 1 through bearings, which can avoid high overload from being transmitted to the motor 2, thereby protecting the motor 2.

[0028] Please continue reading Figure 1 , Figure 3 In some embodiments, the shift fork 6 includes a sleeve 12 and a U-shaped frame 13, and the sleeve 12 is connected to the U-shaped frame 13 through a swing arm 14; the sleeve 12 is sleeved on the output shaft 7 to drive the output shaft 7 to rotate; the stroke nut 4 is clamped in the U-shaped frame 13 (the spacing between the two side plates of the U-shaped frame 13 matches the width of the stroke nut 4), and a slot 15 is provided on the side plate of the U-shaped frame 13, and a clamping column 16 that cooperates with the slot 15 is provided on the side of the stroke nut 4; when the stroke nut 4 slides linearly along the slide rail 5, the clamping columns 16 on both sides are clamped in the slot 15 of the U-shaped frame 13, thereby driving the U-shaped frame 13 to swing around the axis of the sleeve 12, and then driving the output shaft 7 to rotate.

[0029] In a specific embodiment, the slot 15 can be a U-shaped slot or a waist-shaped hole, which can ensure that the column 16 can rotate and move in the slot 15, thereby avoiding mechanical interference between the swing of the fork 6 and the linear motion of the travel nut 4.

[0030] Please continue reading Figure 3 In some embodiments, the shaft hole of the shaft sleeve 12 is a non-circular hole (such as a semicircular hole, a "D"-shaped hole, a rectangular hole, etc.) to avoid relative rotation between the shaft sleeve 12 and the output shaft 7.

[0031] Please continue reading Figure 1 , Figure 2 In some embodiments, an adjusting nut 17 is provided on the outer side of the bearing 8, and the adjusting nut 17 is connected to the screw rod 3 through a threaded pair. The adjusting nut 17 is used to adjust the clearance of the bearing 8 to avoid the problem that the displacement accuracy of the stroke nut 4 is reduced due to excessive clearance of the bearing 8 or the bearing 8 is stuck due to too small clearance.

[0032] In this embodiment, only the middle section of the screw rod 3 that cooperates with the travel nut 4 and the end section that cooperates with the adjustment nut 17 are provided with threads, and the remaining portion is a shaft rod for convenient cooperation with the bearing 8.

[0033] In a specific embodiment, a set screw is radially provided on the side wall of the adjusting nut 17, and the end of the set screw abuts against the outer wall of the screw rod 3. When the adjusting nut 17 is adjusted, the set screw can be used to fix the adjusting nut 17 and the screw rod 3 to prevent relative rotation between the adjusting nut 17 and the screw rod 3.

[0034] Please continue reading Figure 4 In some embodiments, a washer 18 is provided between the inner ring of the bearing 8 and the adjusting nut 17. The washer 18, the adjusting nut 17, the screw rod 3 and the inner ring of the bearing 8 rotate together, which can prevent the adjusting nut 17 from directly contacting the bearing 8, thereby protecting the bearing 8.

[0035] The working principle of the steering gear in this embodiment is as follows:

[0036] The motor 2 drives the first bevel gear 10 to rotate, thereby driving the second bevel gear 11 to rotate, thereby driving the horizontal screw rod 3 to rotate, and the screw rod 3 drives the travel nut 4 to move through the threaded pair, and the travel nut 4 is guided and limited by the slide rail 5, so that the travel nut 4 can reciprocate linearly along the slide rail 5; the linear motion of the travel nut 4 drives the fork 6 to swing, thereby driving the output shaft 7 to rotate; by controlling the rotation direction and angle of the motor 2, the movement direction and travel distance of the travel nut 4 can be controlled, thereby adjusting the direction and angle of the reciprocating swing of the fork 6, and then controlling the real-time posture of the rudder blade.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A high overload resistant steering gear, characterized in that: The invention comprises a housing (1), wherein a motor (2), a screw rod (3), a travel nut (4), a slide rail (5), a shift fork (6) and an output shaft (7) are arranged inside the housing (1), and both ends of the screw rod (3) are mounted on the housing (1) via bearings (8); the output end of the motor (2) is connected to the screw rod (3) for driving the screw rod (3) to rotate; the travel nut (4) is connected to the screw rod (3) via a threaded pair, a slider (9) is arranged on the outer side of the travel nut (4), and the slider (9) is slidably connected to the slide rail (5); one end of the shift fork (6) is connected to the output shaft (7), and the other end is connected to the travel nut (4).

2. The high overload resistant steering gear according to claim 1, characterized in that: A first bevel gear (10) is installed at the output end of the motor (2), and a second bevel gear (11) meshing with the first bevel gear (10) is installed on the screw rod (3).

3. The high overload resistant steering gear according to claim 1, characterized in that: The shift fork (6) comprises a shaft sleeve (12) and a U-shaped frame (13); the shaft sleeve (12) and the U-shaped frame (13) are connected via a swing arm (14); the shaft sleeve (12) is sleeved on the output shaft (7) and is used to drive the output shaft (7) to rotate; a clamping groove (15) is provided on a side plate of the U-shaped frame (13); and a clamping column (16) matched with the clamping groove (15) is provided on a side surface of the travel nut (4).

4. The high overload resistant steering gear according to claim 3, characterized in that: The shaft hole of the shaft sleeve (12) is a non-circular hole.

5. The high overload resistant steering gear according to claim 1, characterized in that: An adjusting nut (17) is provided on the outer side of the bearing (8), the adjusting nut (17) is connected to the screw rod (3) via a threaded pair, and the adjusting nut (17) is used to adjust the clearance of the bearing (8).

6. The high overload resistant steering gear according to claim 5, characterized in that: A washer (18) is provided between the inner ring of the bearing (8) and the adjusting nut (17).

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