An external meshing pawl structure

Abstract

The present invention relates to the technical field of ratchet mechanisms, and specifically to an externally engaged pawl structure. An externally engaged pawl structure comprises a first pivot. The beneficial effect of the present invention is that the invention can increase the rebound force of the pawl body when relative motion occurs between the pawl body and the ratchet by setting a counterweight block, and use inertia to squeeze out the dirt between the counterweight block and the ratchet to the outside, thereby maximally avoiding the situation where the dirt generated by the lubricating oil causes unstable engagement between the counterweight block and the ratchet. By setting a pendulum and a force block, when the pawl body is elastically reset by the elastic coil spring and engages with the tooth groove on the ratchet again, the pendulum will be reset slightly slower than the pawl body due to the influence of static inertia. After that, when the pendulum contacts the force block again, the pawl body has already completed engagement with the ratchet. At this time, the impact of the pendulum on the force block is equivalent to adding an impact force, making the engagement between the counterweight block and the ratchet more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of ratchet mechanisms, in particular to an externally meshing pawl structure. Background Art

[0002] A ratchet is a gear with a rigid tooth-forming surface or friction surface on its outer or inner edge. It is an important component of the ratchet mechanism. Due to the stepping motion pushed by the pawl, the characteristic of this meshing motion is that the ratchet can only rotate in one direction and cannot reverse.

[0003] The ratchet structure, like other meshing structures, requires lubricating oil for lubrication and transmission. After adding lubricating oil to the inside of the ratchet mechanism and working for a long time, the lubricating oil will form black fixed dirt. The dirt is hidden between the teeth of the ratchet, resulting in unstable engagement between the ratchet and the pawl. Therefore, how to solve the impact of the dirt formed by the lubricating oil on the engagement between the ratchet and the pawl is a relatively important issue.

[0004] Referring to patent document CN202971809U, a pawl structure proposed in this patent document, although it can achieve the purpose of stable engagement with several wheels by increasing the number of teeth, does not have the function of eliminating the influence of dirt formed by lubricating oil on the engagement between the ratchet pawls. The dirt formed by lubricating oil is still a potential hidden danger in the pawl structure.

[0005] To this end, the present invention discloses an externally engaged pawl structure. Summary of the Invention

[0006] The present invention aims to solve the technical problems existing in the prior art and provides an external meshing pawl structure to solve the problem that dirt formed by lubricating oil affects the meshing between the ratchet pawls.

[0007] In order to solve the above technical problems, the present invention provides an external meshing pawl structure, and the specific technical solution is as follows:

[0008] An externally engaged pawl structure includes a first pivot, a pawl body is sleeved on the outer surface of the first pivot, a counterweight block integrally formed with the pawl body is provided at the end of the pawl body away from the first pivot, elastic coil springs are fixedly connected to the inner walls of the two end baffles of the first pivot, the two elastic coil springs are fixedly connected to the pawl body, the internal rotation of the pawl body is connected to the second pivot, the two ends of the second pivot are fixedly connected to a pendulum, the outer surface of the counterweight block is fixedly connected to two force blocks, and the two pendulums correspond to the two force blocks respectively.

[0009] As a further optimization method of the externally engaged pawl structure provided by the present invention, three limiting rods are fixedly connected to the inner walls of the two blocking pieces of the first pivot.

[0010] The above-mentioned method is used to further optimize the externally engaged pawl structure provided by the present invention. By setting a limit rod, the displacement of the pawl body along the direction of the first pivot can be limited, thereby avoiding the problem of loose engagement between the pawl body and the ratchet wheel caused by the pawl body sliding on the first pivot.

[0011] As a further optimization method of the externally meshing pawl structure provided by the present invention, a reserved groove is provided inside the pawl body.

[0012] The above-mentioned method is used to further optimize the external meshing pawl structure provided by the present invention. Since the pawl body is mainly made of metal material, the provision of a reserved groove can reduce the loss of raw materials during batch production of the pawl body, thereby saving production resources and production capital investment to a certain extent.

[0013] As a further optimization method of the externally meshing pawl structure provided by the present invention, the bottom surface of the counterweight block is provided with equidistantly arranged drainage grooves.

[0014] The above-mentioned method is used to further optimize the external meshing pawl structure provided by the present invention. By setting a guide groove, the dirt on the contact surface between the counterweight block and the ratchet wheel can be guided and cleaned when relative movement between the counterweight block and the ratchet wheel causes friction, so that the contact surface between the counterweight block and the ratchet wheel can be minimized to reduce the dirt residue, making the engagement between the counterweight block and the ratchet wheel more stable.

[0015] As a further optimization method of the external meshing pawl structure provided by the present invention, an assisting elastic member is fixedly connected to the upper surface of the pawl body, and the length of the assisting elastic member is greater than the distance between the two pendulums.

[0016] As a further optimization method of the externally engaged pawl structure provided by the present invention, the assisting elastic member includes a pressure plate, a sliding rod and a return spring; the sliding rod is arranged on the lower surface of the pressure plate, and the upper surface of the pawl body is provided with a sliding groove that slides with the sliding rod, and the return spring is sleeved on the outside of the sliding rod and fixedly connected to the pressure plate and the pawl body at both ends.

[0017] As a further optimization method of the external meshing pawl structure provided by the present invention, a limiting member is further provided at the bottom end of the sliding rod, and a limiting groove connected to the sliding groove is further opened at the bottom of the sliding groove, and the limiting member is slidably engaged in the limiting groove.

[0018] As a further optimization method of the externally meshing pawl structure provided by the present invention, a plurality of sliding rods are continuously arranged below the pressure plate, and each sliding rod matches a limiting groove provided on the pawl body.

[0019] As a further optimization method of the externally meshing pawl structure provided by the present invention, a buffer pad is further provided on the lower surface of the pressure plate; the buffer pad is made of rubber.

[0020] The above-mentioned method is used to further optimize the external meshing pawl structure provided by the present invention. By setting an assisting elastic part, the static inertia of the pendulum and the elasticity of the assisting elastic part can be used to increase the swing force of the pendulum when the pawl body rotates, so that the force exerted by the pendulum on the force-bearing block is greater, and the engagement between the counterweight block and the ratchet is more stable.

[0021] Compared with the prior art, the external meshing pawl structure of the present invention has the following beneficial effects:

[0022] By setting a counterweight block, the rebound force of the pawl body can be increased when relative movement occurs between the pawl body and the ratchet, and the dirt between the counterweight block and the ratchet can be squeezed out to the outside by using inertia, thereby maximizing the avoidance of the dirt generated by the lubricating oil causing unstable engagement between the counterweight block and the ratchet. By setting a pendulum and a force block, when the pawl body is elastically reset by the elastic coil spring and engages with the teeth on the ratchet again, the pendulum will be reset slightly slower than the pawl body due to the influence of static inertia. After that, when the pendulum contacts the force block again, the pawl body has completed engagement with the ratchet. At this time, the pendulum hitting the force block is equivalent to adding an impact force, which makes the engagement between the counterweight block and the ratchet more stable, and further squeezes out the dirt between the counterweight block and the ratchet, thereby achieving the purpose of cleaning the ratchet teeth and stabilizing the engagement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a front view schematic diagram of the three-dimensional structure of the external meshing pawl structure of the present invention;

[0025] Figure 2 A bottom view schematically shows the three-dimensional structure of the externally meshing pawl structure of the present invention;

[0026] Figure 3 A schematic diagram of the structure of the external meshing pawl structure of the present invention meshing with the ratchet;

[0027] Figure 4 A side view of the externally engaged pawl structure of the present invention;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. First pivot; 2. Ratchet body; 2.1. Slide groove; 2.2. Limiting groove; 3. Counterweight; 4. Elastic coil spring; 5. Second pivot; 6. Pendulum; 7. Force block; 8. Limiting rod; 9. Reserved groove; 10. Guide groove; 11. Power-assisting elastic member; 11.1. Pressure plate; 11.2. Sliding rod; 11.3. Limiting member; 11.4. Return spring. DETAILED DESCRIPTION

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this application. Reference to "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places 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.

[0032] As described in the background art, excessive lubricating oil residue remaining on the ratchet tooth grooves will affect the engagement between the ratchet and the pawl. Therefore, an externally engaged pawl structure is proposed to solve the above problem.

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0034] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] like Figures 1 to 3 As shown, an externally engaged pawl structure includes a first pivot 1, a pawl body 2 is sleeved on the outer surface of the first pivot 1, and a counterweight 3 integrally formed with the pawl body 2 is provided at one end of the pawl body 2 away from the first pivot 1.

[0038] Here, the lower end of the counterweight 3 should be set to a relatively smooth curved surface or a blunt cone, which can enhance the cleaning effect of the dirt when the counterweight 3 hits the tooth groove on the ratchet, so that the dirt tends to move toward the two sides of the counterweight 3.

[0039] The inner walls of the baffles at both ends of the first pivot 1 are fixedly connected with elastic coil springs 4, and the two elastic coil springs 4 are fixedly connected to the pawl body 2. The internal rotation of the pawl body 2 is connected to the second pivot 5, and the two ends of the second pivot 5 are fixedly connected to the pendulum 6.

[0040] The second pivot 5 is provided in order to make the two pendulums 6 move synchronously. Here, a counterweight can be added to the end of the pendulum 6 away from the first pivot 1 to enhance the impact force of the pendulum 6.

[0041] Two force-bearing blocks 7 are fixedly connected to the outer surface of the counterweight block 3 , and the two pendulums 6 correspond to the two force-bearing blocks 7 respectively.

[0042] In this embodiment, three limiting rods 8 are fixedly connected to the inner walls of the two blocking pieces of the first pivot 1 .

[0043] By providing the limiting rod 8, the displacement of the pawl body 2 along the first pivot 1 can be limited, thereby preventing the pawl body 2 from sliding on the first pivot 1 and causing the pawl body 2 to engage loosely with the ratchet wheel.

[0044] In this embodiment, a reserved groove 9 is formed inside the pawl body 2 .

[0045] Since the pawl body 2 is mainly made of metal, the provision of the reserved groove 9 can reduce the loss of raw materials during batch production of the pawl body 2, thereby saving production resources and production capital investment to a certain extent.

[0046] In this embodiment, the bottom surface of the counterweight block 3 is provided with drainage grooves 10 arranged at equal distances.

[0047] By providing the drainage groove 10, the dirt on the contact surface between the counterweight block 3 and the ratchet can be drained and cleaned when relative movement occurs between the counterweight block 3 and the ratchet resulting in friction, so that the dirt residue on the contact surface between the counterweight block 3 and the ratchet is minimized, making the engagement between the counterweight block 3 and the ratchet more stable.

[0048] In this embodiment, a power-assisting elastic member 11 is fixedly connected to the upper surface of the pawl body 2 , and the length of the power-assisting elastic member 11 is greater than the distance between the two pendulums 6 .

[0049] By setting up the assisting elastic member 11, the static inertia of the pendulum 6 and the elasticity of the assisting elastic member 11 can be used to increase the swinging force of the pendulum 6 when the pawl body 2 rotates, so that the force exerted by the pendulum 6 on the force block 7 is greater, making the engagement between the counterweight block 3 and the ratchet more stable.

[0050] The booster spring 11 includes a pressure plate 11.1, a sliding rod 11.2, and a return spring 11.4. The sliding rod 11.2 is disposed on the lower surface of the pressure plate 11.1. The upper surface of the pawl body 2 includes a slide groove 2.1 that slidably engages with the sliding rod 11.2. The return spring 11.4 is sleeved around the outside of the sliding rod 11.2, with both ends fixedly connected to the pressure plate 11.1 and the pawl body 2. Return spring 11.4 is in a neutral position. A limiter 11.3 is also disposed at the bottom of the sliding rod 11.2. A limiter groove 2.2 is also disposed at the bottom of the slide groove 2.1, communicating with the slide groove 2.1. The limiter 11.3 slides and engages within the limiter groove 2.2. When the pawl body 2 rotates, it uses the static inertia of the pendulum 6 to rotate relative to the pawl body 2. When the pendulum 6 contacts the pressure plate 11.1, it pushes the pressure plate 11.1 to move upward, and at the same time, the return spring 11.4 is stretched. When the pawl body 2 reaches the position, the elastic force of the return spring 11.4 pushes the pressure plate 11.1 to move downward quickly.

[0051] A plurality of sliding rods 11.2 are continuously arranged below the pressing plate 11.1, and each sliding rod 11.2 matches a limiting groove 2.2 provided on the pawl body 2.

[0052] A buffer pad 11.5 is further provided on the lower surface of the pressing plate 11.1; the buffer pad 11.5 is made of rubber to ensure that the pressing plate 11.1 is less likely to collide with the pendulum 6 during contact.

[0053] The specific working process of the present invention is as follows:

[0054] First, after the pawl is installed as a whole and fixed in position, after the pawl and ratchet are engaged for a long time, the lubricating oil between the two will form black dirt due to friction and dust erosion, which will seriously affect the engagement effect between the two.

[0055] When the ratchet is rotated, relative movement will be generated between the counterweight block 3 and the ratchet, so that the counterweight block 3 engages with the next-order tooth groove on the ratchet. At the moment of resetting the pawl body 2 and the counterweight block 3, the counterweight block 3 will hit the dirt inside the tooth groove and squeeze the dirt to both sides of the counterweight block 3 through the arc-shaped or conical structure of its bottom surface, making the engagement between the counterweight block 3 and the tooth groove on the ratchet more stable.

[0056] At the same time, since the pendulum 6 is not supported by the elastic force of the elastic coil spring 4, it will rotate slightly later than the pawl body 2 due to the influence of static inertia. When the pendulum 6 contacts the force block 7 after movement, it will exert an impact force on the force block 7 and act on the counterweight 3, which is equivalent to using the counterweight 3 to hit the tooth groove on the ratchet again, further enhancing the dirt cleaning effect on the contact surface between the counterweight 3 and the ratchet, making the engagement between the counterweight 3 and the ratchet more stable.

[0057] Obviously, the embodiments described above are only some of the embodiments of the present application, rather than all of the embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present application.

Claims

1. An externally engaged pawl structure, comprising a first pivot (1), characterized in that: The outer surface of the first pivot (1) is sleeved with a pawl body (2), and the end of the pawl body (2) away from the first pivot (1) is provided with a counterweight (3) integrally formed with the pawl body (2), the inner walls of the baffles at both ends of the first pivot (1) are fixedly connected with elastic coil springs (4), and the two elastic coil springs (4) are fixedly connected to the pawl body (2), the inside of the pawl body (2) is rotatably connected with a second pivot (5), and the two ends of the second pivot (5) are fixedly connected with a pendulum (6), and the outer surface of the counterweight (3) is fixedly connected with two force blocks (7), and the two pendulums (6) correspond to the two force blocks (7) respectively.

2. The external meshing pawl structure according to claim 1, characterized in that: Three limiting rods (8) are fixedly connected to the inner walls of the two blocking pieces of the first pivot (1).

3. The external meshing pawl structure according to claim 1, characterized in that: A reserved groove (9) is provided inside the pawl body (2).

4. The externally engaged pawl structure according to claim 1, characterized in that: The bottom surface of the counterweight block (3) is provided with drainage grooves (10) arranged at equal distances.

5. The externally engaged pawl structure according to claim 1, characterized in that: The upper surface of the pawl body (2) is fixedly connected with a power-assisting elastic member (11).

6. The externally engaged pawl structure according to claim 5, characterized in that: The length of the assisting elastic member (11) is greater than the distance between the two pendulums (6).

7. The externally engaged pawl structure according to claim 6, characterized in that: The assisting elastic member (11) comprises a pressure plate (11.1), a sliding rod (11.2) and a return spring (11.4); the sliding rod (11.2) is arranged on the lower surface of the pressure plate (11.1); the upper surface of the pawl body (2) is provided with a sliding groove (2.1) that slidably cooperates with the sliding rod (11.2); the return spring (11.4) is sleeved on the outside of the sliding rod (11.2) and fixedly connected to the pressure plate (11.1) and the pawl body (2) at both ends.

8. The externally engaged pawl structure according to claim 7, characterized in that: A limiting member (11.3) is also provided at the bottom end of the sliding rod (11.2), and a limiting groove (2.2) communicating with the sliding groove (2.1) is also provided at the bottom of the sliding groove (2.1), and the limiting member (11.3) is slidably engaged in the limiting groove (2.2).

9. The externally engaged pawl structure according to claim 8, characterized in that: A plurality of sliding rods (11.2) are continuously arranged below the pressure plate (11.1), and each sliding rod (11.2) matches a limiting groove (2.2) provided on the pawl body (2).

10. The externally engaged pawl structure according to claim 7, characterized in that: A buffer pad (11.5) is also provided on the lower surface of the pressing plate (11.1); the buffer pad (11.5) is made of rubber.

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