A mechanical clutch

Abstract

The present invention discloses a mechanical clutch, comprising a shell and a power input device, wherein a planetary transmission mechanism is arranged in the shell, and a cam mechanism for connecting and disconnecting the transmission chain of the planetary transmission mechanism and a locking mechanism for manually locking the cam mechanism are arranged on the top of the shell, and the output end of the power input device is connected to the planetary transmission mechanism. The present invention adopts the cam mechanism and the locking mechanism to realize the function of manually intervening in the engagement and disengagement of the transmission chain, which is a function that the existing clutch does not have at all, and the overall structure is compact, light in weight, large in transmitted torque, and safe and reliable in transmission. The present invention adopts the planetary transmission mechanism to reduce the size and weight of the equipment, reduce the difficulty of maintenance, and improve the working reliability of the traction system. The present invention can have mechanical holding ability after power failure, and can also realize unlocking and locking of the holding ability through manual intervention.

Description

Technical Field

[0001] The invention relates to a clutch, in particular to a mechanical clutch. Background Art

[0002] In modern aviation products, some products are required to be able to perform manual operations when the aircraft is powered off. Therefore, during the flight of the aircraft, the product needs to perform functions when powered on. After completing the specified functions, it has the ability to hold the aircraft when the power is off. When performing manual operations, it has the ability to manually disconnect the transmission chain and manually reset the original transmission system. In order to achieve this series of functions, the following product survey was conducted.

[0003] In traditional electric drive transmission chains, electric friction clutches are mostly used to disconnect the transmission chain by turning the power on and off. Its advantages are simple structure and seamless clutching when engaged and disengaged. Its disadvantages are that once the power supply equipment such as the power supply is cut off, the transmission chain will not be able to realize the clutch function. When transmitting torque, the transmitted torque depends on the friction force, so the transmitted torque is small.

[0004] The upgraded product of electromagnetic clutch is tooth-chopping clutch. The advantage is that it can transmit large torque and reliable transmission when engaged. The disadvantage is that when transmitting large torque, it is large in size and has high manufacturing precision, and there is a risk of teeth breaking when it is not meshed. In the case of power failure, it does not have the ability to work manually.

[0005] It is understood that existing products still have not gotten rid of the defects caused by power failure; and still do not have the ability to manually intervene in the event of a power failure. Summary of the invention

[0006] The object of the present invention is to provide a mechanical clutch to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A mechanical clutch comprises a housing and a power input device, wherein a planetary transmission mechanism is arranged in the housing, a cam mechanism for switching on and off the transmission chain of the planetary transmission mechanism and a locking mechanism for manually locking the cam mechanism are arranged on the top of the housing, and the output end of the power input device is connected to the planetary transmission mechanism.

[0009] The planetary transmission mechanism includes a planetary carrier shaft, an inner gear ring, planetary gears, a sun gear shaft, a planetary carrier and a sun gear. The output end of the power input device is connected to the sun gear shaft. A sun gear is arranged on the sun gear shaft. An inner gear ring is arranged on the outer side of the sun gear. A plurality of planetary gears are arranged between the inner gear ring and the sun gear. The planetary gears are all mounted on the planetary carrier. The sun gear, the plurality of planetary gears and the inner gear ring are meshed at the same time. A planetary carrier shaft is arranged on the side of the planetary carrier facing away from the sun gear. An external spline cooperating with the cam mechanism is arranged on the outer side of the inner gear ring.

[0010] The cam mechanism includes a limiting slide groove, a slider and a cam. The limiting slide groove runs through the top of the shell, and the slider is slidably connected in the limiting slide groove. A locking block is provided at the bottom of the slider, and the locking block is matched with the external spline. A cam groove runs through the slider, and the cam is slidably connected to the cam groove.

[0011] The locking mechanism includes a manual end cover, a sliding sleeve, a rotating handle, a compression spring, a block, a crank and a slot. The manual end cover is fixedly installed on the top of the shell, and a crank is rotatably connected inside the manual end cover. The bottom end of the crank is rotatably connected to the shell, and the top of the crank is slidably connected to the sliding sleeve. A block is provided on the side of the sliding sleeve, and a limit ring is provided on the side of the crank. The cam is installed on the side of the crank, and the cam is located below the limit ring. A compression spring is provided on the outside of the crank, and both ends of the compression spring are respectively fixedly connected to the sliding sleeve and the limit ring. A rotating handle is installed on the top of the sliding sleeve, and a slot is passed through the inner wall of the manual end cover, and the slot is corresponding to the cam slot and is matched with the block.

[0012] A bushing is embedded on the top of the shell, the bushing is located below the slider, and the bottom end of the crank is rotatably connected to the bushing.

[0013] The output end of the power input device is connected to the sun gear shaft through a worm gear transmission pair.

[0014] The shell includes a cover plate and a manual input shell, which are installed by screw fastening, and the two opposite sides of the inner gear ring are rotatably connected with the cover plate and the manual input shell respectively, and the limiting slide groove includes a cover plate slide groove and a shell slide groove, the cover plate slide groove is located at the top of the cover plate, and the shell slide groove is located at the top of the manual input shell.

[0015] Copper rings are sleeved on the connection positions between the two opposite side surfaces of the inner gear ring and the cover plate and the manual input housing.

[0016] The beneficial effects of the present invention are:

[0017] The present invention adopts a cam mechanism and a locking mechanism to realize the function of manually intervening in the engagement and disengagement of the transmission chain, which is a function that the existing clutch does not have at all, and has the advantages of compact overall structure, light weight, large torque transmission, and safe and reliable transmission.

[0018] The present invention adopts a planetary transmission mechanism to reduce the size and weight of the equipment, reduce the difficulty of maintenance, and improve the working reliability of the traction system. The present invention can have mechanical holding ability after power failure, and can also realize unlocking and locking of the holding ability through manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of a partial cross-sectional structure of the housing in the present invention;

[0021] Figure 3 This is a schematic diagram of the matching structure of the cover plate and the inner gear ring in the present invention;

[0022] Figure 4 It is a structural schematic diagram of the planetary transmission mechanism in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the inner gear ring and the locking mechanism in the present invention in a separated state;

[0024] Figure 6 It is a structural schematic diagram of the locking mechanism in the present invention during the adjustment process;

[0025] Figure 7 It is a schematic cross-sectional view of the locking structure in the present invention;

[0026] Figure 8 An exploded view of the positional relationship between the sliding sleeve and the manual end cover in the present invention;

[0027] Fig. 9 It is a structural schematic diagram of the locking mechanism in the present invention;

[0028] Fig.10 It is a structural schematic diagram of the slider in the present invention;

[0029] Fig.11 It is a schematic diagram of the cam mechanism in the present invention in a separated state;

[0030] Fig.12 It is a schematic diagram of the meshing state of the cam structure in the present invention.

[0031] In the figure: cover plate 1, manual input housing 2, manual end cover 3, planet carrier shaft 4, sliding sleeve 5, rotating handle 6, cover plate slide groove 7, housing slide groove 8, slider 9, locking block 91, cam groove 92, inner ring gear 10, copper ring 11, planetary gear 12, external spline 13, compression spring 14, sun gear shaft 15, block 16, crank 17, slot 18, cam 19, bushing 20, planet carrier 21, sun gear 22. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0033] See also Figures 1 to 12 In an embodiment of the present invention, a mechanical clutch is provided, including a housing and a power input device, a planetary transmission mechanism is arranged in the housing, a cam mechanism for switching on and off the transmission chain of the planetary transmission mechanism and a locking mechanism for manually locking the cam mechanism are arranged on the top of the housing, and the output end of the power input device is connected to the planetary transmission mechanism.

[0034] The planetary transmission mechanism includes a planet carrier shaft 4, an inner gear ring 10, planetary gears 12, a sun gear shaft 15, a planet carrier 21 and a sun gear 22. The output end of a power input device (such as a motor) is connected to the sun gear shaft 15 through a worm gear transmission pair, and has the characteristic of irreversible power transmission. A sun gear 22 is arranged on the sun gear shaft 15, an inner gear ring 10 is arranged on the outer side of the sun gear 22, and a plurality of planetary gears 12 are arranged between the inner gear ring 10 and the sun gear 22. The planetary gears 12 are all mounted on the planet carrier 21, and the sun gear 22, a plurality of planetary gears 12 and the inner gear ring 10 are meshed at the same time. A planet carrier shaft 4 is arranged on the side of the planet carrier 21 facing away from the sun gear 22, and the central axes of the planet carrier shaft 4 and the sun gear shaft 15 are collinear. An external spline 13 cooperating with the cam mechanism is arranged on the outer side of the inner gear ring 10.

[0035] See also Figure 2 and Figure 3 The outer shell includes a cover plate 1 and a manual input housing 2, which are installed by screw fastening. The two opposite sides of the inner gear ring 10 are rotatably connected with the cover plate 1 and the manual input housing 2 respectively, and the two opposite sides of the inner gear ring 10 are provided with supporting bosses, and the outer side of the supporting bosses is covered with a copper ring 11. The inner gear ring 10 and the cover plate 1 and the manual input housing 2 are all clearance-fitted. The inner gear ring 10 is restricted in five degrees of freedom, and only has the degree of freedom of axial rotation along the sun gear shaft 15 and the planetary carrier shaft 4.

[0036] See also Fig.10 , Fig.11 and Fig.12 The cam mechanism includes a limiting slide, a slider 9 and a cam 19, see Figure 2The top of the shell is penetrated by a limited slot, and a slider 9 is slidably connected in the limited slot. The limited slot includes a cover slot 7 and a shell slot 8. The cover slot 7 is located at the top of the cover 1, and the shell slot 8 is located at the top of the manual input shell 2. A locking block 91 is arranged at the bottom of the slider 9, and the locking block 91 is matched with the external spline 13. A cam groove 92 is penetrated on the slider 9, and the cam 19 is slidably connected with the cam groove 92. The limited slot limits the five degrees of freedom of the slider 9, and the slider 9 can only make linear motion in the slot. By cooperating with the cam 19, as long as the cam 19 does not rotate, the slider 9 is fixed in a unique determined position. When the external spline 13 is subjected to force, the shell slot 8 bears the torque of the inner gear ring 10, and thus this mechanism can transmit a large torque. In summary, the position of the slider 9 can be changed by the cam mechanism, and the engagement and disengagement of the locking block 91 and the external spline 13 can be achieved.

[0037] Delivery Path:

[0038] In a normal state, the locking block 91 of the cam mechanism is inserted into the keyway of the external spline 13 and meshes with the external spline 13, and the internal gear ring 10 loses the degree of freedom of rotation.

[0039] The entire sun gear shaft 15 is driven by the worm gear, which drives the sun gear 22 to rotate. The power is input from the sun gear 22, transmitted through the circumferentially arrayed planetary gears 12, and the planet carrier 21 rotates. Then the power is output through the planet carrier shaft 4, thus realizing power transmission.

[0040] If the sun gear 15 is fixed, the entire transmission chain will be locked, that is, in the power-off state, the sun gear 15 is locked (the worm gear is self-locking), and the entire mechanism realizes the power-off holding capability.

[0041] See also Figure 5 When manual intervention is required, the locking mechanism is rotated to drive the cam 19 to rotate to the other end of the cam groove 92, and the slider 9 slides out of the cover plate 1, so that the locking block 91 disengages from the keyway of the external spline 13, and the inner ring gear 10 obtains rotational freedom. At this time, when the final input is required, that is, the planetary carrier shaft 4 is the input end, and the power is released through the rotation of the inner ring gear 10, so as to achieve the purpose of manual operation and realize the function of two-way manual clutch.

[0042] See also Figure 5~Figure 9The locking mechanism includes a manual end cover 3, a sleeve 5, a rotating handle 6, a compression spring 14, a block 16, a crank 17 and a slot 18. The manual end cover 3 is fixedly installed on the top of the manual input housing 2. The crank 17 is rotatably connected inside the manual end cover 3. The top of the crank 17 is an inner hexagonal structure and is slidably connected with the sleeve 5, that is, the sleeve 5 can slide up and down along the crank 17. At the same time, the rotation of the sleeve 5 will drive the crank 17 to rotate. A block 16 is provided on the side of the sleeve 5, and a limit ring 171 is provided on the side of the crank 17. The cam 19 is installed on the side of the crank 17, and the cam 19 is located below the limit ring 171. A bushing 20 is embedded on the top of the shell, and the bushing 20 is located below the slider 9 (the distance between the bushing 20 and the limit ring 171 is slightly larger than the thickness of the slider 9), and the bottom end of the crank 17 is rotatably connected to the bushing 20.

[0043] A compression spring 14 is arranged on the outside of the crank 17 , and the two ends of the compression spring 14 are respectively fixedly connected to the sliding sleeve 5 and the limit ring 171 . A rotating handle 6 is installed on the top of the sliding sleeve 5 . A card slot 18 is passed through the inner wall of the manual end cover 3 . The card slot 18 is arranged corresponding to the cam slot 92 and cooperates with the card block 16 .

[0044] When the cover plate needs a different state of the above transmission path, that is, when the clutch state needs to be changed, the sleeve 5 is pressed, the crank 17 is rotated 180 degrees, and the block 16 reaches below the other end of the slot 18. Figure 8 Only half of the card slot 18 is shown, and the completed card slot 18 is Figure 8 The whole after mirroring), loosen the compression spring 14 of the sliding sleeve 5 to push the block 16 into the slot 18 at the other end. Since the cam 19 is fixedly installed at the lower end of the crank 17, the cam 19 will also rotate 180 degrees in the cam slot 92 accordingly, and the slider 9 slides, thereby changing the cam mechanism into a different state from before, achieving the purpose of manually disconnecting and connecting the transmission chain.

[0045] A specific application scenario of the present invention is now introduced. When the aircraft door cover is open, the clutch is in the first state, that is, the above-mentioned sun gear 22 inputs, and the planetary gear shaft 4 outputs to drive the door cover to open. At this time, the power is cut off and it enters the second state, that is, the sun gear 15 is locked, and the worm gear is self-locking, and the power-off holding state can be achieved. The door cover can still remain in the open state in a strong wind environment. When the door cover needs to be closed, the existing closing method is to manually push the cover to close. At this time, manual intervention works, and the clutch changes to the third state, that is, the locking block 91 disengages from the keyway of the external spline 13, pushing the cover planetary gear shaft 4 to reverse. At this time, the force can be released through the inner gear ring 10, and will not interfere with other structures. Compared with the existing method of using a cylinder to push out the cover, manually relieving pressure and pushing the cover to buckle, the use of this clutch greatly reduces the weight of the drive mechanism, which is beneficial to the lightweight requirements of aerospace. The present invention has other specific application scenarios, which will not be repeated here.

[0046] The above are only preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the present invention through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A mechanical clutch, comprising a housing and a power input device, characterized in that: A planetary transmission mechanism is arranged in the housing, a cam mechanism for switching on and off the transmission chain of the planetary transmission mechanism and a locking mechanism for manually locking the cam mechanism are arranged on the top of the housing, and the output end of the power input device is connected to the planetary transmission mechanism; The planetary transmission mechanism comprises a planet carrier shaft (4), an inner gear ring (10), planetary gears (12), a sun gear shaft (15), a planet carrier (21) and a sun gear (22); the output end of the power input device is connected to the sun gear shaft (15); a sun gear (22) is arranged on the sun gear shaft (15); an inner gear ring (10) is arranged outside the sun gear (22); a plurality of planetary gears (12) are arranged between the inner gear ring (10) and the sun gear (22); the planetary gears (12) are all mounted on the planet carrier (21); the sun gear (22), the plurality of planetary gears (12) and the inner gear ring (10) are meshed simultaneously; a planet carrier shaft (4) is arranged on the side of the planet carrier (21) facing away from the sun gear (22); and an external spline (13) cooperating with a cam mechanism is arranged outside the inner gear ring (10); The cam mechanism comprises a limit slide groove, a slider (9) and a cam (19); the top of the housing passes through the limit slide groove, the slider (9) is slidably connected in the limit slide groove, a locking block (91) is provided at the bottom of the slider (9), the locking block (91) is matched with the external spline (13), a cam groove (92) passes through the slider (9), and the cam (19) is slidably connected to the cam groove (92); The locking mechanism comprises a manual end cover (3), a sliding sleeve (5), a rotating handle (6), a compression spring (14), a clamping block (16), a crank (17) and a clamping slot (18); the manual end cover (3) is fixedly mounted on the top of the housing; a crank (17) is rotatably connected inside the manual end cover (3); the bottom end of the crank (17) is rotatably connected to the housing; the top end of the crank (17) is slidably connected to the sliding sleeve (5); a clamping block (16) is provided on the side of the sliding sleeve (5); and a limit ring is provided on the side of the crank (17). (171), the cam (19) is mounted on the side of the crank (17), and the cam (19) is located below the limit ring (171), a compression spring (14) is arranged on the outside of the crank (17), and the two ends of the compression spring (14) are respectively fixedly connected to the sliding sleeve (5) and the limit ring (171), a rotating handle (6) is installed on the top of the sliding sleeve (5), and a card slot (18) is passed through the inner wall of the manual end cover (3), and the card slot (18) is arranged corresponding to the cam slot (92) and is arranged in cooperation with the card block (16); A bushing (20) is embedded in the top of the housing, the bushing (20) is located below the slider (9), and the bottom end of the crank (17) is rotatably connected to the bushing (20); The output end of the power input device is connected to the sun gear shaft (15) via a worm gear transmission pair; The housing comprises a cover plate (1) and a manual input housing (2), the cover plate (1) and the manual input housing (2) being fastened and mounted by means of screws, two opposite side surfaces of the inner gear ring (10) being rotatably connected to the cover plate (1) and the manual input housing (2) respectively, the limiting slide groove comprises a cover plate slide groove (7) and a housing slide groove (8), the cover plate slide groove (7) being located at the top of the cover plate (1), and the housing slide groove (8) being located at the top of the manual input housing (2); Copper rings (11) are mounted on the two opposite sides of the inner gear ring (10) at the connection points with the cover plate (1) and the manual input housing (2).

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