Time-delay steady-speed driving mechanism

Abstract

The invention relates to the technical field of aerospace engineering, in particular to a time-delay steady-speed driving mechanism which comprises a shell, a passive driving assembly and a sequential control assembly, the passive driving assembly and the sequential control assembly are arranged on the shell, the passive driving assembly comprises a spring shaft, a spring and an output shaft, one end of the output shaft extends out of the shell, and the other end of the output shaft extends out of the shell. The sequential control assembly comprises a sun gear, a short delay gear train and a long delay gear train which are arranged on the shell; the sun gear is fixedly connected to the output shaft in a sleeved mode, the short delay gear train and the long delay gear train are arranged on the shell on the two sides of the sun gear respectively, the short delay gear train is connected with the sun gear in a meshed mode, and the long delay gear train is connected with the sun gear through a segmented control structure. According to the invention, passive driving is realized, an independent power source is provided, segmented speed control and delayed unfolding are realized, locking can be realized, the size is small, the weight is light, the torque is large, and the high storage ratio of the unfolding mechanism is realized.

Description

Technical Field

[0001] This invention relates to the field of aerospace engineering technology, and specifically to a time-delayed speed-stabilizing drive mechanism. Background Technology

[0002] Many spacecraft possess deployment mechanisms, such as exploration, weather, and communication satellites, as well as lunar rovers. During launch, these deployment mechanisms are folded and locked in place by braking devices. After launch and reaching the designated location, the folded mechanism, guided by ground commands, unlocks and unfolds to its operational state under the action of a drive mechanism. Once it reaches the preset configuration, it locks and functions normally. The deployment speed is crucial for reliable deployment; therefore, the drive mechanism plays a vital role in the spacecraft's deployment process.

[0003] Currently, the deployment speed of common drive mechanisms cannot be controlled in segments. After the brake is released, the drive mechanism drives the deployment mechanism to deploy at a constant speed, which cannot meet the extremely low speed required for initial deployment and thus cannot achieve the purpose of delayed deployment in the initial stage. Summary of the Invention

[0004] To address the issues of segmented speed control and delayed deployment in existing spacecraft deployment mechanisms, this invention proposes a time-delayed speed-stabilizing drive mechanism that is passively driven, has an independent power source, features segmented speed control, delayed deployment, lockability, small size, light weight, high torque, and a high retraction ratio for the deployment mechanism.

[0005] The present invention provides a time-delayed speed-stabilizing drive mechanism, comprising a housing and a passive drive assembly and a timing control assembly disposed on the housing. The passive drive assembly includes a bar shaft, a mainspring, and an output shaft, with one end of the output shaft extending out of the housing. The timing control assembly includes a central gear, a short-delay gear train, and a long-delay gear train disposed on the housing. The central gear is fixedly sleeved on the output shaft. The short-delay gear train and the long-delay gear train are respectively set on the housings on both sides of the central gear. The short-delay gear train is meshed with the central gear, and the long-delay gear train is connected to the central gear through a segmented control structure.

[0006] Preferably, the segmented control structure includes a toothed gear and a limiting block assembly disposed on the housing; The toothed gear is rotatably connected to the housing via a connecting shaft, and a cam is fixedly mounted on the toothed gear; The limiting component includes a limiting seat fixedly mounted on the housing. The limiting seat has a groove on the side facing the toothed gear. A limiting block is movably mounted in the groove. The limiting block is connected to the limiting seat through an elastic reset device. When the missing tooth gear is connected to both the central gear and the long-delay gear train, the central gear drives the long-delay gear train to move. When the missing tooth gear is about to disengage from the central gear, the cam rotates and presses against the limiting block, compressing the elastic reset device; after the missing tooth gear disengages from the central gear, the elastic reset device resets, and the limiting block pushes the cam to drive the missing tooth gear to continue rotating until it meshes with the central gear.

[0007] It also includes a connecting gear, wherein the toothed gear is fixedly mounted on the connecting gear, and the toothed gear and the connecting gear are rotatably connected to the housing through the same connecting shaft. The connecting gear is connected to a long-delay gear train, and the toothed gear is intermittently meshed with the central gear.

[0008] Preferably, the circumferential surface of the limiting block facing the cam includes a first inclined surface and a second inclined surface, and the junction of the first inclined surface and the second inclined surface is arranged facing the cam protrusion; When the cam slides and connects with the first inclined plane, the toothed gear meshes with the central gear. After the cam slides past the junction of the first and second inclined planes, the toothed gear disengages from the central gear, the second inclined plane slides into contact with the cam, and pushes the cam to continue rotating until it meshes with the central gear.

[0009] Preferably, the elastic reset device is a reset spring; The limiting block has a receiving groove on one end facing the bottom of the groove, one end of the reset spring is matched and disposed in the receiving groove, and the other end of the reset spring abuts against the limiting seat.

[0010] Preferably, both the long-delay gear train and the short-delay gear train include multiple gear sets connected in sequence; Each gear set has an escape wheel meshing at the end furthest from the central gear. Each escape wheel is connected to a balance pendulum that matches the escape wheel. Both the escape wheel and the balance pendulum are rotatably connected to the housing. The number of gear sets in the long-delay gear train is greater than the number of gear sets in the short-delay gear train.

[0011] This invention features passive drive, independent power source, segmented speed control, delayed deployment, locking capability, small size, light weight, high torque, and a high storage ratio for the deployment mechanism.

[0012] This invention utilizes the different working states of short-delay and long-delay gear trains: when the long-delay and short-delay gear trains work simultaneously, the unfolding mechanism is controlled to move at an extremely low speed to achieve the purpose of delay; when the missing tooth gear of the long-delay gear train disengages from the central gear, the short-delay gear train works, and the unfolding mechanism unfolds at a relatively stable speed. By switching between the two modes, two delay actions at different times are achieved, thereby achieving the purpose of segmented control of the unfolding speed and realizing the delay and speed control of the unfolding mechanism.

[0013] This invention enables segmented control and delayed deployment of the spacecraft deployment mechanism, thereby improving the reliability of the spacecraft deployment mechanism. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a schematic diagram showing the positional relationship between the toothed gear, the limiting block assembly, and the central gear at the beginning of the stroke.

[0016] Figure 3 This is a schematic diagram showing the positional relationship between the missing tooth gear, the limit block assembly, and the central gear when the previous step ends and the working state is reached.

[0017] Reference numerals in the attached drawings: 1-housing, 2-center gear, 3-short-delay gear train, 4-long-delay gear train, 5-gear with missing tooth, 6-cam, 7-limit seat, 8-limit block, 9-connecting gear, 10-reset spring. Detailed Implementation

[0018] The present invention provides a time-delayed speed-stabilizing drive mechanism, comprising a housing 1 and a passive drive assembly and a timing control assembly disposed on the housing 1. The passive drive assembly includes a bar shaft, a mainspring, and an output shaft, with one end of the output shaft extending out of the housing 1. The timing control assembly includes a central gear 2, a short-delay gear train 3, and a long-delay gear train 4 disposed on the housing 1. The central gear 2 is fixedly sleeved on the output shaft. The short delay gear train 3 and the long delay gear train 4 are respectively set on the housing 1 on both sides of the central gear 2. The short delay gear train 3 is meshed with the central gear 2, and the long delay gear train 4 is connected to the central gear 2 through a segmented control structure.

[0019] In one embodiment, the segmented control structure includes a toothed gear 5 and a limiting block 8 assembly disposed on the housing 1; The toothed gear 5 is rotatably connected to the housing 1 via a connecting shaft, and a cam 6 is fixedly mounted on the toothed gear 5; The limiting component includes a limiting seat 7 fixedly mounted on the housing 1. The limiting seat 7 has a groove on the side facing the toothed gear 5. A limiting block 8 is movably mounted in the groove. The limiting block 8 is connected to the limiting seat 7 through an elastic reset device. When the missing tooth gear 5 is connected to both the center gear 2 and the long-delay gear train 4, the center gear 2 drives the long-delay gear train 4 to move. When the missing tooth gear 5 is about to disengage from the center gear 2, the cam 6 rotates and presses against the limiting block 8, compressing the elastic reset device; after the missing tooth gear 5 disengages from the center gear 2, the elastic reset device resets, and the limiting block 8 pushes the cam 6 to drive the missing tooth gear 5 to continue rotating until it meshes with the center gear 2.

[0020] In one embodiment, a connecting gear 9 is also included. The toothed gear 5 is fixedly mounted on the connecting gear 9, and the toothed gear 5 and the connecting gear 9 are rotatably connected to the housing 1 through the same connecting shaft. The connecting gear 9 is connected to the long-delay gear train 4, and the toothed gear 5 is intermittently meshed with the central gear 2.

[0021] In one embodiment, the peripheral surface of the limiting block 8 facing the cam 6 includes a first inclined surface and a second inclined surface, and the junction of the first inclined surface and the second inclined surface is provided to protrude towards the cam 6. When the cam 6 slides and connects with the first inclined plane, the toothed gear 5 meshes with the central gear 2; After the cam 6 slides past the junction of the first and second inclined planes, the toothed gear 5 disengages from the central gear 2, the second inclined plane slides into contact with the cam 6, and pushes the cam 6 to continue rotating until it meshes with the central gear 2.

[0022] In one embodiment, the elastic reset device is a reset spring 10; The limiting block 8 has a receiving groove on one end facing the bottom of the groove, and one end of the reset spring 10 is matched and disposed in the receiving groove, while the other end of the reset spring 10 abuts against the limiting seat 7.

[0023] In one embodiment, both the long-delay gear train 4 and the short-delay gear train 3 include multiple gear sets connected in sequence; Each gear set has an escape wheel meshing at the end furthest from the central gear 2. Each escape wheel is connected to a balance pendulum that matches the escape wheel. Both the escape wheel and the balance pendulum are rotatably connected to the housing 1. The number of gear sets in the long delay gear train 4 is greater than the number of gear sets in the short delay gear train 3.

[0024] See Figure 1 The long-delay gear train 4 has an 8-stage transmission with a transmission ratio of 1128.79, while the short-delay gear train 3 has a 5-stage transmission with a transmission ratio of 195.248. In operation, the mainspring drives the bar shaft to rotate, which in turn drives the output shaft to rotate. Since the central gear 2 is fixedly sleeved on the output shaft, the timing control component controls the output shaft. According to the release time requirements of the drive unit, the timing gear train adopts a speed-increasing transmission gear train. Both the long-delay gear train 4 and the short-delay gear train 3 include multiple gear sets connected in sequence. The end of each gear set away from the central gear 2 is meshed with an escape wheel, and each escape wheel is connected to a balance pendulum that matches the escape wheel. Both the escape wheel and the balance pendulum are rotatably connected to the housing 1 to ensure the release time of the product.

[0025] The bar shaft is connected to the central gear 2. A toothed gear 5 is provided between the central gear 2 and the long-delay gear train 4. The short-delay gear train 3 meshes with the central gear 2. The central gear 2 simultaneously drives both the long-delay gear train 4 and the short-delay gear train 3 to operate. Figure 2 As shown; The product is expected to have a total of 13 working revolutions. During the first 0.3 revolutions, the central gear 2 is engaged with both the long-delay gear train 4 and the short-delay gear train 3, operating simultaneously to control the unfolding mechanism at an extremely low speed, achieving the delay purpose. After the delay mechanism rotates more than 0.3 revolutions, the toothed gear 5 of the long-delay gear train 4 disengages from the central gear 2, and the remaining 12.7 revolutions are operated solely by the short-delay gear train 3, allowing the unfolding mechanism to unfold at a relatively stable speed. By switching between these two modes, two delay actions at different times are achieved, enabling segmented control of the unfolding speed and realizing both delay and speed control of the unfolding mechanism.

[0026] The specific actions of disengaging and re-engaging the missing tooth gear 5 with the center gear 2 are as follows: When the central gear 2 drives the long-delay gear train 4 to rotate through the toothed gear 5, the cam 6 rotates and begins to press against the limiting block 8. The elastic reset device is compressed. When the toothed gear 5 is about to disengage from the central gear 2, the cam 6 will slide past the connection between the first and second inclined planes. At this time, the deformation of the elastic reset device will reach its maximum. After the cam 6 slides past the connection between the first and second inclined planes, the toothed gear 5 disengages from the central gear 2, and the second inclined plane slides into contact with the cam 6. Under the action of the elastic reset device, the limiting block 8 pushes the cam 6 to continue rotating until the toothed gear 5 meshes with the central gear 2 again.

[0027] The limiting block 8 mainly serves to limit the toothed gear 5, ensuring that the toothed gear 5 can re-engage with the center gear 2 after disengagement.

Claims

1. A time-delayed speed-stabilizing drive mechanism, comprising a housing and a passive drive assembly and a timing control assembly disposed on the housing, wherein the passive drive assembly includes a bar, a mainspring, and an output shaft, one end of the output shaft extending out of the housing, characterized in that, The timing control components include a central gear, a short-delay gear train, and a long-delay gear train mounted on the housing; The central gear is fixedly sleeved on the output shaft. The short-delay gear train and the long-delay gear train are respectively set on the housings on both sides of the central gear. The short-delay gear train is meshed with the central gear, and the long-delay gear train is connected to the central gear through a segmented control structure.

2. The time-delayed speed-stabilizing drive mechanism as described in claim 1, characterized in that, The segmented control structure includes a toothed gear and a limiting block assembly mounted on the housing. The toothed gear is rotatably connected to the housing via a connecting shaft, and a cam is fixedly mounted on the toothed gear; The limiting component includes a limiting seat fixedly mounted on the housing. The limiting seat has a groove on the side facing the toothed gear. A limiting block is movably mounted in the groove. The limiting block is connected to the limiting seat through an elastic reset device. When the missing tooth gear is connected to both the central gear and the long-delay gear train, the central gear drives the long-delay gear train to move. When the missing tooth gear is about to disengage from the central gear, the cam rotates and presses against the limiting block, compressing the elastic reset device; after the missing tooth gear disengages from the central gear, the elastic reset device resets, and the limiting block pushes the cam to drive the missing tooth gear to continue rotating until it meshes with the central gear.

3. The time-delayed speed-stabilizing drive mechanism as described in claim 2, characterized in that, It also includes a connecting gear, wherein the toothed gear is fixedly mounted on the connecting gear, and the toothed gear and the connecting gear are rotatably connected to the housing through the same connecting shaft. The connecting gear is connected to a long-delay gear train, and the toothed gear is intermittently meshed with the central gear.

4. The time-delayed speed-stabilizing drive mechanism as described in claim 2, characterized in that, The peripheral surface of the limiting block facing the cam includes a first inclined surface and a second inclined surface, and the junction of the first inclined surface and the second inclined surface is arranged to protrude towards the cam. When the cam slides and connects with the first inclined plane, the toothed gear meshes with the central gear. After the cam slides past the junction of the first and second inclined planes, the toothed gear disengages from the central gear, the second inclined plane slides into contact with the cam, and pushes the cam to continue rotating until it meshes with the central gear.

5. The time-delayed speed-stabilizing drive mechanism as described in claim 2, characterized in that, The elastic reset device is a reset spring; The limiting block has a receiving groove on one end facing the bottom of the groove, one end of the reset spring is matched and disposed in the receiving groove, and the other end of the reset spring abuts against the limiting seat.

6. The time-delayed speed-stabilizing drive mechanism as described in claim 1, characterized in that, Both the long-delay gear train and the short-delay gear train include multiple gear sets connected in sequence; Each gear set has an escape wheel meshing at the end furthest from the central gear. Each escape wheel is connected to a balance pendulum that matches the escape wheel. Both the escape wheel and the balance pendulum are rotatably connected to the housing. The number of gear sets in the long-delay gear train is greater than the number of gear sets in the short-delay gear train.

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