阅读说明：本技术 双联不完全齿轮精密空间齿轮传动装置 (Duplex incomplete gear precise space gear transmission device ) 是由 朱浩 罗旭 朱军 赵宇博 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种双联不完全齿轮精密空间齿轮传动装置,中间轴上安装有主动双联齿轮,输出轴上安装有从动双联齿轮；第一从动不完全齿轮的有齿段与第二从动不完全齿轮的有齿段错开设置并相互衔接；第一主动完全齿轮与第一从动不完全齿轮的有齿段构成A齿轮传动副,第二主动完全齿轮与第二从动不完全齿轮的有齿段构成B齿轮传动副,A齿轮传动副与B齿轮传动副的传动比不同,A齿轮传动副与B齿轮传动副之间留有轴向间隙。传动精度高、结构更紧凑、成本更低,能轻松实现精密执行机构和仪器仪表等设备的齿轮传动系统对变传动比以及精密空间的安装布置需求。(The invention discloses a precise space gear transmission device with duplicate incomplete gears, wherein a driving duplicate gear is arranged on an intermediate shaft, and a driven duplicate gear is arranged on an output shaft; the toothed section of the first driven incomplete gear and the toothed section of the second driven incomplete gear are arranged in a staggered manner and are mutually connected; the first driving complete gear and the first driven incomplete gear form a gear transmission pair A, the second driving complete gear and the second driven incomplete gear form a gear transmission pair B, the transmission ratio of the gear transmission pair A and the gear transmission pair B is different, and an axial gap is reserved between the gear transmission pair A and the gear transmission pair B. The transmission precision is high, the structure is more compact, the cost is lower, and the requirements of the gear transmission system of equipment such as a precise actuating mechanism, an instrument and the like on the installation and the arrangement of a variable transmission ratio and a precise space can be easily realized.)

1. The utility model provides a accurate space gear drive of pair incomplete gear, includes step motor (1), driving gear (2), driven gear (3), jackshaft (4), output shaft (5), its characterized in that: a driving duplicate gear (6) is mounted on the intermediate shaft (4), and a driven duplicate gear (7) is mounted on the output shaft (5); the driving duplicate gear (6) consists of a first driving complete gear (6a) and a second driving complete gear (6b) which are concentrically arranged, the driven duplicate gear (7) consists of a first driven incomplete gear (7a) and a second driven incomplete gear (7b) which are concentrically arranged, a toothed section of the first driven incomplete gear (7a) and a toothed section of the second driven incomplete gear (7b) are arranged in a staggered mode and are mutually connected, the diameter of a non-toothed section of the first driven incomplete gear (7a) is not larger than the diameter of a tooth root of the toothed section, and the diameter of a non-toothed section of the second driven incomplete gear (7b) is not larger than the diameter of a tooth root of the toothed section; the gear transmission pair A is formed by the toothed sections of the first driving complete gear (6a) and the first driven incomplete gear (7a), the gear transmission pair B is formed by the toothed sections of the second driving complete gear (6B) and the second driven incomplete gear (7B), the transmission ratios of the gear transmission pair A and the gear transmission pair B are different, and an axial gap is reserved between the gear transmission pair A and the gear transmission pair B.

2. The duplicate incomplete gear precision space gear transmission device according to claim 1, wherein: still include ratchet (8), pawl (9), round pin axle (10) and pawl torsional spring (11), install on jackshaft (4) ratchet (8), install outside jackshaft (4) pawl (9) through round pin axle (10), pawl torsional spring (11) main part winding is on round pin axle (10), install respectively on pawl (9) and round pin axle (10) at the both ends of pawl torsional spring (11), and laminating is all the time on the teeth of a cogwheel of ratchet (8) under the effect of pawl torsional spring (11) pawl (9) for ratchet (8) can only rotate towards a direction.

3. A twin incomplete gear precision space gear transmission device according to claim 2, wherein: the intermediate shaft (4) is also provided with an encoder (12), and the driven gear (3), the encoder (12), the ratchet wheel (8) and the driving duplicate gear (6) are sequentially arranged along the axial direction.

4. A double-split partial gear precision space gear transmission according to any one of claims 1 to 3, wherein: the supporting bearings (13) of the intermediate shaft (4) and the output shaft (5) are tapered roller bearings, and the driving duplicate gear (6) is in key connection with the intermediate shaft (4), and the driven duplicate gear (7) is in key connection with the output shaft (5) respectively.

5. The duplicate incomplete gear precision space gear transmission device according to claim 4, wherein: the stepping motor (1) and the output shaft (5) are positioned on the same side of the intermediate shaft (4).

Technical Field

The invention relates to a power transmission device in the mechanical field, which is suitable for the fields of aerospace, national defense and military industry, robots, precise instruments and equipment and the like.

Background

The precise space gear transmission mechanism has the advantages of large transmission power range, high transmission efficiency, accurate transmission ratio, good working stability, good durability and the like, and is widely applied to the fields of aerospace, national defense and military industry, robots, precise instruments and equipment and the like. With the continuous development of aerospace technology, the requirements of precise actuating mechanisms, instruments and meters and other equipment of aircrafts on mechanical transmission systems are continuously improved, and the requirements are mainly shown in the following steps: the transmission ratio is required to be large, the output torque is large, the size is small, the weight is light, the transmission precision is high, the idle return is small, and the like. For a precise space gear transmission mechanism, a complex dynamic environment has great influence on the bearing capacity, the dynamic characteristic, the transmission precision and the transmission reliability of the precise space gear transmission mechanism.

At present, the transmission ratios of gear transmission mechanisms adopted by equipment such as an aircraft precision actuating mechanism, instruments and meters are basically fixed transmission ratios, and the special requirements of the equipment such as the precision actuating mechanism, the instruments and meters on variable transmission ratios cannot be met. If the transmission ratio is to be changed, gear control devices such as multi-gear transmission and shifting forks are generally needed, and the transmission mode is complex in structure, large in size and high in manufacturing cost.

Disclosure of Invention

The invention aims to provide a precise space variable transmission ratio gear transmission device which has high transmission precision, more compact structure and lower cost, and can easily meet the installation and arrangement requirements of a gear transmission system of equipment such as a precise actuating mechanism, instruments and meters and the like on the variable transmission ratio and the precise space.

Therefore, the technical scheme adopted by the invention is as follows: a precise space gear transmission device with duplicate incomplete gears comprises a stepping motor, a driving gear, a driven gear, an intermediate shaft and an output shaft, wherein the intermediate shaft is provided with the driving duplicate gear, and the output shaft is provided with the driven duplicate gear; the driving duplicate gear consists of a first driving complete gear and a second driving complete gear which are concentrically arranged, the driven duplicate gear consists of a first driven incomplete gear and a second driven incomplete gear which are concentrically arranged, a toothed section of the first driven incomplete gear and a toothed section of the second driven incomplete gear are staggered and connected with each other, the diameter of a toothless section of the first driven incomplete gear is not larger than the diameter of a tooth root of the toothed section, and the diameter of a toothless section of the second driven incomplete gear is not larger than the diameter of a tooth root of the toothed section; the gear section of the first driving complete gear and the gear section of the first driven incomplete gear form an A gear transmission pair, the gear section of the second driving complete gear and the gear section of the second driven incomplete gear form a B gear transmission pair, the transmission ratio of the A gear transmission pair and the B gear transmission pair is different, and an axial gap is reserved between the A gear transmission pair and the B gear transmission pair.

Preferably, the duplex incomplete gear precise space gear transmission device further comprises a ratchet wheel, a pawl, a pin shaft and a pawl torsion spring, wherein the ratchet wheel is installed on the intermediate shaft, the pawl is installed outside the intermediate shaft through the pin shaft, a pawl torsion spring main body is wound on the pin shaft, two ends of the pawl torsion spring are respectively installed on the pawl and the pin shaft, and the pawl is always attached to the gear teeth of the ratchet wheel under the action of the pawl torsion spring, so that the ratchet wheel can only rotate towards one direction. The anti-reversion is realized through the additional ratchet wheel and pawl mechanism, and the safe work of the transmission device is ensured.

Preferably, the intermediate shaft is further provided with an encoder, and the driven gear, the encoder, the ratchet wheel and the driving duplicate gear are sequentially arranged along the axial direction. The encoder is widely applied to aircrafts, is a common occasion with variable transmission ratio and special working rotation requirement, and can be effectively protected by combining an incomplete duplex gear and a ratchet and pawl anti-reversion mechanism.

Preferably, the support bearings of the intermediate shaft and the output shaft are tapered roller bearings so as to meet the requirements of vibration resistance, impact resistance and fatigue resistance; the driving duplicate gear and the intermediate shaft as well as the driven duplicate gear and the output shaft are respectively in key connection, and the duplicate gear can be replaced at any time according to the requirement of the gear transmission device so as to meet the requirements on different variable transmission ratios.

The invention has the beneficial effects that:

(1) the gear transmission device combines two complete gears and incomplete gears into a duplicate gear of two pairs of gear transmission pairs, adopts different transmission ratios, and easily realizes the requirement of a gear transmission system of equipment such as a precise actuating mechanism, an instrument and meter on variable transmission ratios;

(2) each complete gear is meshed with one incomplete gear, the toothed sections of the two incomplete driven gears of the double driven gears are staggered and connected with each other, and when one pair of gear transmission pairs quit meshing, the other pair of gear transmission pairs enter into meshing at the same moment and are combined with a stepping motor, so that the requirement of unidirectional stepping rotation in a specified step number is met;

(3) the motion transformation and load moment matching of the mechanism are realized by adjusting and controlling the structural form of the transmission device and transmitting and distributing power, and the functions of various complex variable transmission ratios and characteristic rotation can be easily realized by changing the tooth number and position distribution of non-full gears and the combination among different gears, so that the transmission precision is ensured, the structure is more compact and the cost is lower.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a front view of the driving duplicate gear and the driven duplicate gear.

Fig. 3 is a perspective view of the driving duplicate gear and the driven duplicate gear.

Detailed Description

The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:

referring to fig. 1-3, a duplex incomplete gear precise space gear transmission device comprises a stepping motor 1, a driving gear 2, a driven gear 3, an intermediate shaft 4, an output shaft 5, a driving duplex gear 6, a driven duplex gear 7, a ratchet 8, a pawl 9, a pin shaft 10, a pawl torsion spring 11, an encoder 12 and a support bearing 13.

The stepping motor 1 is installed on the input shaft, a threaded hole is formed in the end portion of the motor, the motor is connected with the motor installation support through a screw, the motor installation support is directly and fixedly connected with the rack, and the motor can also be directly and fixedly connected with the rack through the screw. The intermediate shaft 4 is provided with a driving duplicate gear 6, and the output shaft 5 is provided with a driven duplicate gear 7. The driving duplicate gear 6 is composed of a first driving complete gear 6a and a second driving complete gear 6b which are concentrically arranged, and the driven duplicate gear 7 is composed of a first driven incomplete gear 7a and a second driven incomplete gear 7b which are concentrically arranged. The shaft holes of the first driving complete gear 6a and the second driving complete gear 6b are through holes formed by one-time stamping, so that the coaxiality of the through holes is ensured; similarly, through holes formed by one-time punching are also used for the shaft holes of the first incomplete driven gear 7a and the second incomplete driven gear 7 b.

The first incomplete driven gear 7a and the second incomplete driven gear 7b are divided into a toothed section and a non-toothed section. The toothed section of the first driven incomplete gear 7a and the toothed section of the second driven incomplete gear 7b are arranged in a staggered manner and are mutually connected. The diameter of the toothless section of the first driven incomplete gear 7a must not be larger than the root diameter of the toothed section; the diameter of the toothless section of the second driven incomplete gear 7b must not be larger than the root diameter of the toothed section, ensuring that the toothless section not brought into the meshed state does not generate resistance to the rotation of the toothed section brought into the meshed state.

The first driving complete gear 6a and the toothed section of the first driven incomplete gear 7a form a gear transmission pair A, and the second driving complete gear 6B and the toothed section of the second driven incomplete gear 7B form a gear transmission pair B. The center distances of the gear transmission pair A and the gear transmission pair B are equal, the transmission ratios are different, and an axial gap is reserved between the gear transmission pair A and the gear transmission pair B, and if the distance between the two teeth is 2mm, the gear transmission pair A and the gear transmission pair B can be adjusted according to actual requirements.

Ratchet 8 installs on jackshaft 4, and pawl 9 installs outside jackshaft 4 through round pin axle 10, and 11 main part windings of pawl torsional spring are on round pin axle 10, and pawl 9 and round pin axle 10 are installed respectively at pawl 11's both ends, and pawl 9 laminates all the time on ratchet 8's the teeth of a cogwheel under pawl torsional spring 11's effect for ratchet 8 can only rotate towards a direction.

An encoder 12 is further mounted on the intermediate shaft 4, and the driven gear 3, the encoder 12, the ratchet wheel 8 and the driving duplicate gear 6 are sequentially arranged along the axial direction.

Preferably, the supporting bearings 13 of the intermediate shaft 4 and the output shaft 5 are tapered roller bearings, and the driving duplicate gear 6 and the intermediate shaft 4, the driven duplicate gear 7 and the output shaft 5 are in key connection respectively, so that synchronous movement can be ensured, and replacement is convenient.

In addition, the stepping motor 1 and the output shaft 5 are positioned on the same side of the intermediate shaft 4, and the space is further simplified.

It is assumed that the toothed section and the non-toothed section of the first driven incomplete gear 7a and the second driven incomplete gear 7b are each two sections, and the angle occupied by each section is 90 °. Every 720-degree rotation of the driving duplicate gear 6 is one working period of the transmission device, and the single working period is divided into two working steps. In the first working step, the driving duplicate gear 6 rotates 0-495 degrees, and the driven duplicate gear 7 rotates 0-90 degrees (namely, the first driving complete gear 6a and the first driven incomplete gear 7a are engaged in the working step, and the transmission ratio is 11: 2); in the second working step, the driving duplicate gear 6 rotates 495-720 degrees, and the driven duplicate gear 7 rotates 90-180 degrees (namely, the second driving complete gear 6b and the second driven incomplete gear 7b are engaged in the working step, and the transmission ratio is 5: 2).