Double-pre-tightening mechanism for eliminating backlash between gear and rack in forward and reverse directions

Abstract

The invention discloses a double pre-tightening mechanism for forward and reverse clearance elimination of a gear and a rack, and mainly relates to the technical field of rack clearance elimination and pre-tightening, the double pre-tightening mechanism comprises a base, two fixed racks are fixedly arranged on the base, the upper parts of the fixed racks are tooth-shaped structures, the lower parts of the fixed racks are ratchets, a seat plate is slidably arranged on the two fixed racks, a main gear is arranged on the seat plate, and the main gear is slidably arranged on the seat plate; a locking assembly is arranged on the base plate and used for controlling the base plate to move or stop, and therefore support is provided for clearance elimination of the rack. The gear and rack pre-tightening device can eliminate gaps and achieve the gear and rack pre-tightening effect.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of rack backlash elimination and pre-tightening, and in particular to a double pre-tightening mechanism for gear and rack backlash elimination in both forward and reverse directions. Background Art

[0002] Various driving mechanisms are often used in the process of automation equipment to achieve functions. For example, the gear rack structure is one of the most commonly used and cheapest mechanisms. However, the clearance error between the gear rack has always been the biggest problem during use. If the spacing is too large, the error accuracy will deteriorate. If the spacing is too small, the gear rack will fit too tightly and cannot move. This requires engineers to adjust the clearance. The adjustment process is very labor-intensive and time-consuming for personnel. Therefore, in modern life, assembly mechanisms are often used and anti-backlash mechanisms are added to reduce errors. Some commonly used anti-backlash mechanisms are achieved by fitting a pair of gear surfaces together and rotating them together and connecting a tension spring between the gears. Although such a mechanism can achieve the anti-backlash function, it cannot be used in driving situations with large forces but is used in encoder component structures. Therefore, in order to eliminate the gap in driving situations, it is very necessary to design a special positive and negative anti-backlash double preload structure to achieve it. Summary of the Invention

[0003] (1) Technical issues to be resolved In view of the above problems, the present invention needs to provide a dual pre-tightening mechanism for eliminating the backlash of gears and racks in both forward and reverse directions, which can eliminate the backlash error between the gear and the rack, and can also achieve the pre-tightening effect, and can effectively solve the backlash difference in driving occasions.

[0004] (2) Technical solution In response to the above technical problems, the present invention provides a double pre-tightening mechanism for eliminating the backlash of gear racks in forward and reverse directions, including a base, two fixed racks axially symmetrically arranged on the base, the fixed racks having a toothed structure above and a ratchet structure below, a seat plate slidingly arranged between the two fixed racks, a main gear rotatably arranged on the seat plate, and the main gear is also slidably mounted on the seat plate; a locking assembly is provided on the seat plate, and the locking assembly is used to control the movement or stop of the seat plate.

[0005] Furthermore, a raised track is provided on the base, and a slide groove is provided on the seat plate, and the slide groove cooperates with the raised track.

[0006] Furthermore, two side grooves are provided on the upper surface of the seat plate, and an intermediate groove is provided between the two side grooves. An intermediate shaft is fixedly connected to the main gear, and the intermediate shaft is fixedly connected to the output shaft of the main motor. The intermediate shaft slides in the intermediate groove, and two small cylinders are axially symmetrically fixedly connected to the main gear, and the two small cylinders slide in the two side grooves respectively.

[0007] Furthermore, a spring is fixedly connected between the main motor and the seat plate, and the main gear and the fixed rack away from the spring form a gear-rack match.

[0008] Furthermore, the locking assembly includes a main cylinder, which is fixedly mounted on the base plate. The movable end of the main cylinder is fixedly connected to a connecting plate. The connecting plate is fixedly connected to the pull rod, and the pull rod is slidably mounted on a through slot, which is arranged on the base plate.

[0009] Furthermore, a leaf spring is fixedly mounted on the seat plate, and the pull rod is arranged through the leaf spring. Both ends of the leaf spring are fixed on the seat plate, and the middle is arched.

[0010] Furthermore, two groups of connecting rod claws are symmetrically arranged on the pull rod, and the connecting rod claws include an angle connecting rod, one end of the angle connecting rod is slidingly connected to the pull rod, and the other end is rotatably connected to the seat plate. The end of the angle connecting rod away from the pull rod is also rotatably connected to a locking pawl, and the locking pawl is slidably installed on the seat plate.

[0011] Furthermore, the locking pawl is provided with an inclined surface, and the locking pawl cooperates with the ratchet teeth of the fixed rack.

[0012] Compared with the prior art, the present invention has the following advantages: 1. The present invention sets a base and a fixed rack as a fixed structure, and a seat plate as a movable carrier, and a main gear and a main motor are slidably arranged on the seat plate. Without changing the existing gear and rack, springs, middle slides, and side slides are arranged on the main motor and the seat plate, providing sufficient space and flexible movement space for the main gear, so that the distance between the main gear and the fixed rack can be variable, and finally the gap between the main gear and the fixed rack can be eliminated during the moving meshing process, thereby reducing errors and preventing over-tightening or over-loosening during movement; 2. The present invention sets a locking assembly under the main gear, specifically a main cylinder , connecting plate, pull rod, and connecting rod claw, with the cooperation of the main cylinder, connecting plate, pull rod, and connecting rod claw, the state change of the main gear is realized, the position restriction of the main gear is released when moving, and the main gear is kept in a fixed state when stopping. The locking pawl is inserted into the ratchet of the fixed rack to prevent the main gear and the fixed rack on the seat plate from moving again after the main motor stops, and is locked in advance to realize the pre-tightening function. Through the above structure set by the present invention, the gap can be eliminated when the gear and rack are matched in forward and reverse rotation, and the locking components on both sides can realize the double locking function, automatically have the pre-locking function, and adapt to the use needs of various existing mechanical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a partial first-angle schematic diagram of the locking mechanism of the present invention.

[0015] Figure 3 Schematic diagram of the seat plate of the present invention.

[0016] Figure 4 This is a partial second angle schematic diagram of the locking mechanism of the present invention.

[0017] Figure 5 It is a partial third angle schematic diagram of the locking mechanism of the present invention.

[0018] Figure 6 It is a partial bottom view of the locking mechanism of the present invention.

[0019] Figure numbers: 1-locking mechanism; 101-main gear; 102-main motor; 103-base; 104-spring; 105-seat plate; 106-fixed rack; 107-small cylinder; 108-intermediate shaft; 109-side slide groove; 110-intermediate slide groove; 111-hinge groove; 112-cylinder groove; 113-through slot; 114-fixed column; 115-limiting groove; 116-locking pawl; 117-angle connecting rod; 118-master cylinder; 119-pull rod; 120-leaf spring; 121-connecting plate. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to specific embodiments. The present invention is explained through the exemplary embodiments and descriptions of the present invention, but is not intended to limit the present invention.

[0021] Example: Figures 1-6 The double pre-tightening mechanism for eliminating the backlash of a gear rack in forward and reverse directions shown includes a locking mechanism 1, which includes a base 103. The base 103 is fixed on a device, a machine or the ground, and is set according to actual conditions. Two fixed racks 106 are axially symmetrically fixed on the base 103. In order to achieve the function of double pre-locking, the two fixed racks 106 have an upper tooth structure and a ratchet below. The width of the upper tooth structure is greater than the ratchet below, that is, the tooth structure is close to the main gear 101, and the ratchet is away from the main gear 101. This setting is to avoid interference with the matching of the gear rack. The upper tooth structure is used for the engagement of the main gear 101, thereby driving the seat plate 105 to move, and the ratchet is used to lock the seat plate 105 to keep the seat plate 105 fixed.

[0022] Two raised rails are provided on the base 103, and two slide grooves are provided on the seat plate 105. The slide grooves cooperate with the raised rails to facilitate the sliding of the seat plate 105, so that it can move smoothly in the forward and reverse directions.

[0023] Two side grooves 109 are provided on the upper surface of the seat plate 105, and an intermediate groove 110 is provided between the two side grooves 109. An intermediate shaft 108 is fixedly connected through the center of the main gear 101, and the intermediate shaft 108 is fixedly connected to the output shaft of the main motor 102. The intermediate shaft 108 slides in the intermediate groove 110. The purpose of sliding is to adjust the distance between the main motor 102 and the seat plate 105. Two small cylinders 107 are symmetrically fixedly connected to the upper axis of the main gear 101. The two small cylinders 107 slide in the two side grooves 109 respectively. The purpose of sliding is to cooperate in adjusting the distance between the main motor 102 and the seat plate 105.

[0024] The main motor 102 is a forward and reverse motor, and the main motor 102 is electrically connected to the control system. A spring 104 is also connected between the main motor 102 and the seat plate 105. One end of the spring 104 is fixedly connected to the seat plate 105. The main motor 102 consists of a motor and a support plate. The support plate is detachably mounted on the motor with screws and becomes a whole with the motor. The other end of the spring 104 is fixedly connected to the support plate of the main motor 102. The spring 104 is used to flexibly adjust the distance and also plays a role of buffering and resetting; the main gear 101 forms a gear rack with a fixed rack 106 away from the spring 104, and the fixed rack 106 close to the spring 104 mainly plays a locking role.

[0025] The locking assembly includes a main cylinder 118, which is fixedly mounted on the cylinder groove 112, and the cylinder groove 112 is set on the seat plate 105. The movable end of the main cylinder 118 is fixedly connected to the connecting plate 121, and the connecting plate 121 is fixedly connected to the round rod of the pull rod 119. The pull rod 119 is divided into two parts, one part is the round rod, and the other part is the hinged seat. The hinged seat is fixedly mounted on the round rod, and the round rod of the pull rod 119 is slidably mounted on the through slot 113, and the through slot 113 is set on the seat plate 105.

[0026] A leaf spring 120 is also fixedly mounted on the seat plate 105 , and the pull rod 119 is arranged through the leaf spring 120 . Both ends of the leaf spring 120 are fixed on the seat plate 105 , and the middle is arched. The leaf spring 120 plays a role of buffering and resetting.

[0027] Two sets of connecting rod claws are symmetrically arranged on the pull rod 119. The functions and effects of the two sets of connecting rod claws are the same. In order to realize the double pre-locking function, the two sets of connecting rod claws include an angle connecting rod 117. The angle connecting rod 117 consists of a horizontal rod and a vertical rod. The length of the vertical rod is greater than the horizontal rod. One end of the vertical rod of the angle connecting rod 117 is provided with a sliding groove and is slidably connected to the pull rod 119. The intersection of the horizontal rod and the vertical rod is rotatably connected to the hinge groove 111 of the seat plate 105. There are two hinge grooves 111, one for the angle connecting rods 117 on both sides, and the end of the angle connecting rod 117 away from the pull rod 119 is also rotatably connected to the locking pawl 116, which is specifically connected to the end of the horizontal section of the angle connecting rod 117. The locking pawl 116 is slidably installed on the limiting groove 115 of the seat plate 105. This arrangement can make the locking pawl 116 only slide horizontally, which is convenient for starting the locking function.

[0028] The locking pawl 116 is provided with an inclined surface, and the inclined surface is provided to facilitate insertion into the ratchet structure of the fixed rack 106 .

[0029] The working principle of the present invention is as follows: the base 103 serves as the fixed end and the seat plate 105 serves as the movable end. Under normal conditions, the two are in a stationary state, and the two locking pawls 116 are stuck in the ratchet teeth of the fixed rack 106, so that the main gear 101 and the fixed rack 106 will not move relative to each other, thereby eliminating the gap error between them.

[0030] When it is necessary to start the main motor 102 to rotate forward to drive the main gear 101 to rotate, the main gear 101 cooperates with the fixed rack 106 gear rack to drive the seat plate 105 to move, the movable end of the main cylinder 118 is first extended, and it remains in the extended state after being extended, the leaf spring 120 is compressed, and the pull rod 119 moves forward to drive the angle link 117 to rotate, and the angle link 117 drives the locking pawl 116 to slide and be extracted from the ratchet under the fixed rack 106, releasing the engagement with the fixed rack 106, and then the seat plate 105 can move smoothly. The setting of the spring 104 can adjust the distance between the main gear 101 and the fixed rack 106 away from the spring 104, so that the tooth gap can be automatically adjusted during the movement, and it will not be too tight or too loose. Some gaps can be eliminated to a certain extent, thereby better achieving the matching relationship between the gear rack.

[0031] The present invention can be used alone or in combination with other mechanisms. When in use, the base 103 can be directed upwards, and the main motor 102 can be used in a manner such as with the attachment. Figure 1 It is used in an inverted form, and the entire structure remains unchanged when it is inverted.

[0032] When the main motor 102 stops rotating, the main cylinder 118 opens the air release valve. Under the action of the leaf spring 120, the pull rod 119 rebounds quickly, causing the angle link 117 to rotate and the locking pawl 116 to slide. The locking pawl 116 is re-engaged in the ratchet under the fixed rack 106. At this time, the seat plate 105 remains fixed, and the gap difference between the main gear 101 and the fixed rack 106 is reduced or eliminated.

[0033] When the main motor 102 moves in the opposite direction, the above steps are repeated to eliminate the gap and achieve the positive and negative double pre-locking function; the present invention adds a positive and negative limit ratchet to prevent the moving part and the fixed part from moving again behind the motor without changing the matching of the gear and the rack. At the same time, an automatic position adjustment mechanism is added to the motor end to automatically adjust the matching gap between the gear and the rack to prevent the movement process from being too tight or too loose, and finally achieves the function of eliminating the gap difference during forward and reverse rotation and achieving double pre-locking.

[0034] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A dual pre-tightening mechanism for eliminating backlash in both forward and reverse directions of a gear rack, comprising a base (103), characterized in that: Two fixed racks (106) are axially symmetrically provided on the base (103), the fixed racks (106) have a toothed structure on the top and ratchet teeth on the bottom, a seat plate (105) is slidably provided between the two fixed racks (106), a main gear (101) is rotatably provided on the seat plate (105), and the main gear (101) is also slidably installed on the seat plate (105); a locking assembly is provided on the seat plate (105), and the locking assembly is used to control the movement or stop of the seat plate (105).

2. A dual preload mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 1, characterized in that: A raised track is provided on the base (103), and a slide groove is provided on the seat plate (105), and the slide groove cooperates with the raised track.

3. A dual pre-tightening mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 2, characterized in that: Two side slide grooves (109) are provided on the upper surface of the seat plate (105), and an intermediate slide groove (110) is provided between the two side slide grooves (109). An intermediate shaft (108) is fixedly connected to the main gear (101), and the intermediate shaft (108) is fixedly connected to the output shaft of the main motor (102). The intermediate shaft (108) slides in the intermediate slide groove (110). Two small cylinders (107) are axially symmetrically fixedly connected to the main gear (101), and the two small cylinders (107) slide in the two side slide grooves (109) respectively.

4. A dual pre-tightening mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 3, characterized in that: A spring (104) is also fixedly connected between the main motor (102) and the seat plate (105), and the main gear (101) and a fixed rack (106) away from the spring (104) form a gear rack match.

5. The dual pre-tightening mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 1, characterized in that: The locking assembly includes a main cylinder (118), which is fixedly mounted on the base plate (105). The movable end of the main cylinder (118) is fixedly connected to a connecting plate (121). The connecting plate (121) is fixedly connected to a pull rod (119). The pull rod (119) is slidably mounted on a through slot (113). The through slot (113) is provided on the base plate (105).

6. A dual pre-tightening mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 5, characterized in that: A leaf spring (120) is also fixedly mounted on the seat plate (105), and the pull rod (119) is arranged through the leaf spring (120). Both ends of the leaf spring (120) are fixed on the seat plate (105), and the middle is arched.

7. A dual pre-tightening mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 6, characterized in that: Two sets of connecting rod claws are centrally symmetrically arranged on the pull rod (119), and the connecting rod claws include an angle connecting rod (117), one end of the angle connecting rod (117) is slidably connected to the pull rod (119), and the other end is rotatably connected to the seat plate (105), and the end of the angle connecting rod (117) away from the pull rod (119) is also rotatably connected to a locking pawl (116), and the locking pawl (116) is slidably mounted on the seat plate (105).

8. A dual pre-tightening mechanism for eliminating backlash in both positive and negative directions of a gear and rack according to claim 7, characterized in that: The locking pawl (116) is provided with an inclined surface, and the locking pawl (116) is engaged with the ratchet teeth of the fixed rack (106).

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