A detachable transmission mechanism to prevent fatigue loads

Abstract

This invention belongs to the field of mechanical transmission technology, specifically relating to a disengaged transmission mechanism for preventing fatigue loads. The invention divides the output gear set of the transmission mechanism into fixed teeth and moving teeth. By controlling the meshing state of the fixed teeth, moving teeth, and tooth arcs, the vibration and impact borne by the load unit are isolated from the transmission mechanism when the load unit is not required to operate, thereby extending the service life of the transmission mechanism. This disengaged transmission mechanism for preventing fatigue loads includes: an output gear set mounted on the output shaft of the transmission box and a tooth arc mounted on the load unit; the tooth arc meshes with the output gear set, causing the load unit to rotate around its axis; the tooth arc has a disengaged tooth arc region and a rotating tooth arc region; when the output gear set meshes with the disengaged tooth arc region, the transmission box and the load unit are disengaged; when the output gear set meshes with the rotating tooth arc region, the transmission box drives the load unit through the transmission structure.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission technology, and specifically relates to a detachable transmission mechanism that is resistant to fatigue loads. Background Technology

[0002] A transmission system typically includes a power output unit, a transmission mechanism, and a load unit. When the load unit needs to operate, the power source drives the load unit to move through the transmission mechanism to complete the specific operation. When the load unit does not need to operate, it is fixed on the mounting platform. If the mounting platform experiences impact or vibration, the impact and vibration will be transmitted to the load unit, which in turn transmits the impact and vibration as force to the transmission mechanism. This force, as a fatigue load, can reduce the service life of the transmission mechanism and even cause damage over time. Therefore, how to easily and efficiently isolate the vibration and impact borne by the load from the transmission mechanism when the load unit is not needed, thereby extending the service life of the transmission mechanism, is a technical problem that needs to be solved. Summary of the Invention

[0003] In view of this, the present invention proposes a detachable transmission mechanism to prevent fatigue loads. The output gear group of the transmission mechanism is divided into fixed teeth and moving teeth. By controlling the meshing state of the fixed teeth, moving teeth and tooth arc, the vibration and impact borne by the load unit are isolated from the transmission mechanism when the load unit does not need to be driven, thereby extending the service life of the transmission mechanism.

[0004] The detachable transmission mechanism for fatigue load protection includes: an output gear set disposed on the output shaft of the transmission box and a tooth arc disposed on the load unit;

[0005] The toothed arc meshes with the output gear set, causing the load unit to rotate about its axis;

[0006] The tooth arc has a disengaged tooth arc region and a rotating tooth arc region; when the output gear set meshes with the disengaged tooth arc region, the transmission box and the load unit disengage from transmission.

[0007] When the output gear set meshes with the rotating tooth arc region, the transmission box drives the load unit through the transmission structure.

[0008] Preferably, the output gear set includes: fixed teeth, moving teeth, and bearings.

[0009] The fixed tooth is fixedly sleeved on the output shaft, and the movable tooth is coaxially sleeved on the output shaft through the bearing;

[0010] The moving tooth has a fan-shaped groove along the circumferential direction on the side opposite to the fixed tooth, and a fan-shaped boss is provided along the circumferential direction on the side opposite to the moving tooth. The fan-shaped boss can be inserted into the fan-shaped groove and rotate around the output shaft axis within the fan-shaped groove, so that the moving tooth and the fixed tooth switch between the disengaged position and the transmission position.

[0011] Preferably, the thickness of the rotating tooth arc region is greater than or equal to the total thickness of the fixed tooth and the moving tooth;

[0012] The thickness of the area detached from the tooth arc is not greater than the thickness of the moving tooth;

[0013] When the output gear set is in the position of disengaging from the tooth arc region, only the moving teeth mesh with the disengaging tooth arc region.

[0014] Preferably, it also includes a limiting block, which is located below and spaced apart from the load unit, and is used to limit the rotation range of the load unit.

[0015] Preferably, it also includes a retainer pin, which is inserted into the pin hole of the load unit to restrict the rotation of the load unit.

[0016] Beneficial effects:

[0017] (I) The transmission mechanism of this invention is located between the transmission box of the power output unit and the load unit. By changing the meshing relationship between the load unit's disengagement and rotation tooth arc regions and the output gear set on the transmission box, the transmission or disengagement between the load unit and the power output unit is achieved. That is, when the output gear set meshes with the disengagement tooth arc region, the reaction force of the load unit on the transmission box is isolated, avoiding damage or reduced lifespan to the transmission mechanism. Furthermore, this transmission mechanism is simple in structure and easy to install and operate.

[0018] (ii) The limiting block of the present invention has the function of limiting the rotation angle of the load unit, thereby preventing damage to the load unit.

[0019] (iii) The retainer pin of the present invention restricts the rotation of the load unit through the pin hole of the load unit, and can accurately limit the rotation angle of the load unit.

[0020] (iv) The fixed teeth, moving teeth, bearings, tooth arcs, retainer pins and limiting blocks of the present invention are easy to process and manufacture, and have low cost and are easy to promote and apply. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the detachable transmission mechanism of the present invention;

[0022] Figure 2This is a side view of the detachable transmission mechanism of the present invention;

[0023] Figure 3 This is a schematic diagram of the meshing of the fixed teeth, moving teeth, and tooth arc in the working state of the transmission box of the present invention;

[0024] Figure 4 This is a schematic diagram of the fixed tooth structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the moving tooth structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the load unit of the present invention in a non-operating state;

[0027] Figure 7 This is a schematic diagram showing the connection between the moving tooth and the fixed tooth on surface A of the present invention;

[0028] Figure 8 This is a schematic diagram showing the separation of the moving tooth and the fixed tooth A surface in this invention;

[0029] Among them, 1-fixed pin, 2-limiting block, 3-tooth arc, 4-transmission box, 5-fixed tooth, 6-moving tooth, 7-load unit, 8-bearing, 9-output shaft, 10-rotating shaft, 31-detached tooth arc area, 32-rotating tooth arc area, 51-fan-shaped boss, 61-fan-shaped groove. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figure 1-8 As shown, a detachable transmission mechanism for preventing fatigue load is located between the transmission box 4 and the load unit 7 of the power output unit. An output shaft 9 extends from the side of the transmission box 4 facing the load unit 7, and an output gear set is sleeved on the output shaft 9. The load unit 7 has a rotating shaft 10 and a tooth arc 3. The tooth arc 3 meshes with the output gear set, enabling the load unit 7 to rotate around its rotating shaft 10 under the drive of the output shaft 9. The rotation angle is determined by the length of the tooth arc 3.

[0032] The output gear set includes a fixed gear 5, a movable gear 6, and a bearing 8. The fixed gear 5 and the bearing 8 are sequentially fixedly sleeved on the extended output shaft 9, and the movable gear 6 is fixedly sleeved on the outer ring of the bearing 8 (i.e., the movable gear 6 is sleeved on the output shaft 9 through the bearing 8). The output shaft 9, the fixed gear 5, and the movable gear 6 are all coaxial. The gear parameters of the fixed gear 5 and the movable gear 6 are the same.

[0033] There are disengagement and transmission positions between the fixed tooth 5 and the moving tooth 6. When the fixed tooth 5 and the moving tooth 6 are in the disengagement position, there is no transmission between the fixed tooth 5 and the moving tooth 6. At this time, the power of the output shaft 9 cannot be transmitted to the moving tooth 6 through the fixed tooth 5. When the fixed tooth 5 and the moving tooth 6 are in the transmission position, there is transmission between the fixed tooth 5 and the moving tooth 6. At this time, the power of the output shaft 9 can be transmitted to the moving tooth 6 through the fixed tooth 5.

[0034] The tooth arc 3 is not an arc-shaped structure with a uniform thickness. It has a detached tooth arc region 31 and a rotating tooth arc region 32. The thickness of the detached tooth arc region 31 is less than the thickness of the rotating tooth arc region 32. The thickness of the rotating tooth arc region 32 is greater than or equal to the total thickness of the fixed tooth 5 and the moving tooth 6. The thickness of the detached tooth arc region 31 is not greater than the thickness of the moving tooth 6, ensuring that when the output gear set is located in the detached tooth arc region 31, the fixed tooth 5 does not mesh with the output gear set. The disengaged tooth arc region 31 is located at one or both ends of the tooth arc 3. When the output gear set is in the disengaged tooth arc region 31, the fixed tooth 5 does not mesh with the tooth arc 3, and the fixed tooth 5 and the moving tooth 6 are in the disengaged position. At this time, the force exerted by the transmission box 4 on the load unit 7 is isolated (i.e., in the disengaged state). When the output gear set is in the rotating tooth arc region 32, both the fixed tooth 5 and the moving tooth 6 mesh with the rotating tooth arc region 32, and the fixed tooth 5 and the moving tooth 6 are in the transmission position. At this time, the transmission box 4 can transmit the force to the load unit 7.

[0035] This transmission mechanism can achieve the purpose of preventing fatigue load by simply and efficiently disengaging the transmission, that is, temporarily isolating the force between the transmission box 4 and the load unit 7, so as to avoid damage or reduced life of the transmission mechanism caused by the mounting platform connected to the load unit 7 when subjected to impact and vibration.

[0036] like Figure 4-5 As shown, the detailed design of the fixed tooth 5 and the moving tooth 6 of the output gear set (used to switch between the disengagement position and the transmission position between the fixed tooth 5 and the moving tooth 6) is as follows: The moving tooth 6 has a fan-shaped groove 61 arranged circumferentially on the side opposite to the fixed tooth 5, and a fan-shaped boss 51 is provided circumferentially on the side opposite to the fixed tooth 5 and the moving tooth 6; the fan-shaped boss 51 can be inserted into the fan-shaped groove 61, and the fan-shaped angle of the fan-shaped boss 51 is smaller than the fan-shaped angle of the fan-shaped groove 61, ensuring that the fan-shaped boss 51 rotates about the axis of the output shaft 9 within the fan-shaped groove 61. The end faces at both ends of the fan-shaped boss 51 are designated as surface A, and the end faces at both ends of the fan-shaped groove 61 are designated as surface B. When the fan-shaped boss 51 rotates within the fan-shaped groove 61 and surface A contacts surface B, the fixed tooth 5 and the moving tooth 6 are in the transmission position, at which time the fixed tooth 5 can drive the moving tooth 6 to rotate. When surface A separates from surface B, the fixed tooth 5 and the moving tooth 6 are in the disengaged position, and the fixed tooth 5 cannot drive the moving tooth 6 to rotate.

[0037] As an example, the transmission mechanism also includes a limiting block 2, which is located below and spaced apart from the load unit 7 to limit the rotation angle of the load unit 7.

[0038] As an example, the transmission mechanism also includes a retainer pin 1, which is used to restrict the rotation of the load unit 7 by inserting the retainer pin 1 into the pin hole of the load unit 7.

[0039] Working principle:

[0040] like Figure 1 , 4 As shown in Figure 5, when it is necessary to drive the load unit 7 to rotate around the rotating shaft 10, the fixed tooth 5 is first driven to rotate through the output shaft 9, so that the A surface of the fan-shaped boss 51 on one side of the fixed tooth 5 abuts against the B surface of the corresponding side of the fan-shaped groove 61 of the moving tooth 6, so that the fixed tooth 5 and the moving tooth 6 are in the transmission position. At this time, the fixed tooth 5 drives the moving tooth 6 to rotate, and the fixed tooth 5 and the moving tooth 6 simultaneously mesh with the rotating tooth arc area 32 of the tooth arc 3. The power is transmitted from the fixed tooth 5 to the moving tooth 6 through the output shaft 9 of the power output unit. The meshing of the fixed tooth 5 and the moving tooth 6 with the tooth arc 3 drives the load unit 7 to rotate around the rotating shaft 10.

[0041] like Figure 6 , 7 As shown in Figure 8, when the load unit 7 changes from a rotating working state to a fixed stationary state, the moving tooth 6 and the fixed tooth 5 mesh with the rotating tooth arc region 31 of the tooth arc 3, thereby driving the load unit 7 to rotate until the retainer pin 1 coincides with the pin hole on one side of the load unit 7. The retainer pin 1 is then inserted into the pin hole to fix the position of the load unit 7. At this time, the moving tooth 6 meshes with the disengaged tooth arc region 31 of the tooth arc 3 and is fixed in position, while the fixed tooth 5 disengages from the tooth arc 3. When the fixed tooth 5 is driven to rotate in the opposite direction by a certain angle, the A surface of the fan-shaped boss 51 of the fixed tooth 5 disengages from the B surface of the fan-shaped groove 61 of the moving tooth 6. At this time, the impact and vibration borne by the load unit 7 can only be transmitted to the moving tooth 6 through the disengaged tooth arc region 31 of the tooth arc 3, and cannot be transmitted to the fixed tooth 5 and the transmission box 4, thus achieving disengagement from the load unit 7.

[0042] like Figure 6 As shown, during the process of changing the load unit 7 from a fixed state to a rotating working state, the retainer pin 1 is first pulled out of the pin hole of the load unit 7, that is, the limit on the load unit 7 is released. The fixed tooth 5 is driven to rotate through the transmission box 4. When the A surface of the fan-shaped boss 51 of the fixed tooth 5 abuts against the B surface of the fan-shaped groove 61 of the moving tooth 6, the fixed tooth 5 can push the moving tooth 6 and continue to drive the fixed tooth 5 to rotate until the moving tooth 6 and the fixed tooth 5 simultaneously and accurately re-mesh into the rotating tooth arc area 32 of the tooth arc 3. Then the power can be driven by the transmission of the transmission box 4 and the meshing of the output gear set with the tooth arc 3 to drive the load unit 7 to rotate.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A detachable transmission mechanism resistant to fatigue loads, located between the transmission box (4) of the power output unit and the load unit (7), characterized in that, The transmission mechanism includes: an output gear set disposed on the output shaft (9) of the transmission box (4) and a tooth arc (3) disposed on the load unit (7). The tooth arc (3) meshes with the output gear set, causing the load unit (7) to rotate about its axis (10); The tooth arc (3) has a disengaged tooth arc region (31) and a rotating tooth arc region (32); when the output gear set meshes with the disengaged tooth arc region (31), the transmission box (4) and the load unit (7) are disengaged from transmission; When the output gear set meshes with the rotating tooth arc region (32), the transmission box (4) drives the load unit (7) through the transmission mechanism.

2. The detachable transmission mechanism for preventing fatigue loads according to claim 1, characterized in that, The output gear set includes: fixed teeth (5), moving teeth (6) and bearings (8); The fixed tooth (5) is fixedly sleeved on the output shaft (9), and the movable tooth (6) is coaxially sleeved on the output shaft (9) through the bearing (8); The movable tooth (6) is provided with a fan-shaped groove (61) along the circumferential direction on the side opposite to the fixed tooth (5), and a fan-shaped boss (51) is provided along the circumferential direction on the side opposite to the movable tooth (6). The fan-shaped boss (51) can be inserted into the fan-shaped groove (61) and rotate within the fan-shaped groove (61) about the axis of the output shaft (9), so that the movable tooth (6) and the fixed tooth (5) can switch between the disengagement position and the transmission position.

3. The detachable transmission mechanism for preventing fatigue loads according to claim 2, characterized in that, The thickness of the rotating tooth arc region (32) is greater than or equal to the total thickness of the fixed tooth (5) and the moving tooth (6); The thickness of the detached tooth arc region (31) is not greater than the thickness of the moving tooth (6); When the output gear set is in the position of disengaging from the tooth arc region (31), only the moving tooth (6) meshes with the disengaging tooth arc region (31).

4. A detachable transmission mechanism for resisting fatigue loads according to any one of claims 1-3, characterized in that, It also includes a limiting block (2), which is located below and spaced apart from the load unit (7) to limit the rotation range of the load unit (7).

5. A detachable transmission mechanism for preventing fatigue loads according to any one of claims 1-3, characterized in that, It also includes a retainer pin (1), which is used to restrict the rotation of the load unit (7) by inserting the retainer pin (1) into the pin hole of the load unit (7).

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