CN212377273U

CN212377273U - Gear selecting and shifting actuator

Info

Publication number: CN212377273U
Application number: CN202021214415.6U
Authority: CN
Inventors: 李战训; 刘钊; 杨忠勇
Original assignee: Zhejiang Keboda Industrial Co ltd
Current assignee: Zhejiang Keboda Industrial Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-19
Anticipated expiration: 2030-06-28

Abstract

A gear selecting and shifting actuator comprises a gear selecting and shifting shaft, a gear selecting sleeve driving mechanism and a limiting component. The gear selecting sleeve driving mechanism is used for driving the gear selecting sleeve to move along the axial direction, and the gear selecting and shifting shaft is connected with the gear selecting sleeve so as to move synchronously along with the gear selecting sleeve. The gear selecting sleeve comprises a screw rod, and the screw rod is provided with a first multi-thread one-way thread; the gear selecting sleeve driving mechanism comprises a transmission part and a transmission part driving mechanism; the transmission part is provided with a mounting hole, the wall of the mounting hole is provided with a second multi-thread one-way thread matched with the first multi-thread one-way thread, and the screw rod penetrates through the mounting hole and is in spiral connection with the transmission part; the transmission piece driving mechanism is used for driving the transmission piece to rotate; the limiting component is provided with a first limiting structure and a second limiting structure, the first limiting structure is used for limiting the transmission piece to move along the axial direction, and the second limiting structure is used for limiting the gear selecting sleeve to rotate. The utility model discloses the dead phenomenon of transmission card can not appear when carrying out the selection and keep off the operation, and transmission precision is high moreover, simple structure, low in manufacturing cost.

Description

Gear selecting and shifting actuator

Technical Field

The utility model relates to a gear shift technique of automotive transmission.

Background

Fig. 1 shows a schematic diagram of a conventional gear selection and shift actuator for a transmission of a motor vehicle. As shown, the conventional gear selecting and shifting actuator includes a gear selecting sleeve 108 and two

crown gears

154, 156 that drive the gear selecting sleeve 108. Two sets of threads with opposite rotation directions are arranged on the gear selecting sleeve 108, the two crown gears are respectively meshed with one set of threads on the gear selecting sleeve 108, and the two crown gears can be driven in a rotating mode, so that the gear selecting sleeve is driven to move in a translation mode along the axis direction of the gear selecting sleeve.

The prior technical scheme mainly has the following defects:

1. the gear selecting sleeve 108 is provided with two types of positive and negative transmission threads which are meshed with the

crown gears

154 and 156 for transmission, and the

crown gears

154 and 156 move in opposite directions, so that the mechanism is easy to be locked;

2. the transmission structure adopted by the prior art has lower transmission precision due to the structural characteristics;

3. the gear selecting sleeve 108 is provided with two types of positive and negative transmission threads, and has a complex structure, high manufacturing difficulty and high cost.

Disclosure of Invention

The utility model aims to solve the technical problem that a select gear shift executor is provided, it can not appear the dead phenomenon of transmission card when selecting to keep off the operation, and the transmission precision is high moreover, simple structure, low in manufacturing cost.

The embodiment of the utility model provides a gear selecting and shifting actuator, which comprises a gear selecting and shifting shaft, a gear selecting sleeve and a gear selecting sleeve driving mechanism; the gear selection sleeve driving mechanism is used for driving the gear selection sleeve to move along the axial direction, and the gear selection and shifting shaft is connected with the gear selection sleeve so as to synchronously move along with the gear selection sleeve; the gear selecting sleeve driving mechanism comprises a transmission part and a transmission part driving mechanism; the transmission part is provided with a mounting hole, the wall of the mounting hole is provided with a second multi-thread one-way thread matched with the first multi-thread one-way thread, and the screw rod penetrates through the mounting hole and is in spiral connection with the transmission part; the transmission piece driving mechanism is used for driving the transmission piece to rotate; the gear selecting and shifting actuator further comprises a limiting component, the limiting component is provided with a first limiting structure and a second limiting structure, the first limiting structure is used for limiting the transmission piece to move along the axial direction, and the second limiting structure is used for limiting the rotation of the gear selecting sleeve.

In the gear selecting and shifting actuator, the gear selecting sleeve comprises the mounting part, and one end of the screw rod is connected with the mounting part; the second limiting structure is matched with the mounting part to limit the rotation of the gear selecting sleeve.

The gear selecting and shifting actuator, wherein the second limiting structure comprises a second groove extending along a direction parallel to the axis of the screw rod; the mounting portion has a radially projecting projection extending into the second recess.

The utility model discloses at least, have following advantage:

the utility model discloses a select shelves cover is connected through multi-thread one-way screw with select shelves cover actuating mechanism transmission, compares with two-way transmission screw, can not take place the dead phenomenon of transmission card, compares single thread, and transmission precision is high, simple structure, low in manufacturing cost, intensity that can greatly increased part, the life of extension product to can guarantee that transmission helical pitch is big, the response is fast.

Drawings

Fig. 1 shows a schematic diagram of a conventional gear shifting actuator.

Fig. 2 shows a schematic structural diagram (partially in section) of a gear selecting and shifting actuator according to a first embodiment of the present invention.

Fig. 3 shows a schematic view of a range sleeve according to a first embodiment of the invention.

Fig. 4 shows a schematic view of a transmission according to a first embodiment of the invention.

Fig. 5 shows a schematic view of the gear shift sleeve according to the first embodiment of the present invention after being connected to the transmission member.

Fig. 6 shows a schematic view of a guide sleeve according to a first embodiment of the present invention.

Fig. 7 shows a schematic view of the matching between the gear selecting sleeve and the guide sleeve according to the first embodiment of the present invention.

Fig. 8 shows a schematic view of the matching of the gear selecting sleeve, the gear selecting sleeve driving mechanism and the guide sleeve according to the first embodiment of the present invention.

Fig. 9 shows a schematic structural diagram of a gear selecting and shifting actuator according to a second embodiment of the present invention.

Fig. 10 shows a right side view of fig. 9.

Fig. 11 shows a schematic structural diagram of a gear selecting and shifting actuator according to a third embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to fig. 2 to fig. 8. According to the utility model discloses select shift executor of first embodiment, including selecting selector shaft 1, selecting the shelves cover 2, guide pin bushing 3, selecting the shelves cover actuating mechanism and casing 5.

The gear selection sleeve driving mechanism is used for driving the gear selection sleeve 2 to move along the axial direction, and the gear selection shaft 1 is connected with the gear selection sleeve 2 so as to move synchronously along with the gear selection sleeve 2. For example, the gear selection sleeve 2 can be sleeved on the gear selection shaft 1, and both ends of the gear selection sleeve 2 are axially limited relative to the gear selection shaft 1, so that the gear selection shaft 1 can move synchronously along with the gear selection sleeve 2.

The gear selecting sleeve 2 comprises a screw rod 21 and a mounting part 22, the screw rod 21 is provided with a first multi-line one-way thread 211, and one end of the screw rod 21 is connected with the mounting part 22. The number N of flights of the screw 21 satisfies: the number of the spiral lines is more than or equal to 5 and less than or equal to 7. The lead P of the screw 21 satisfies 1.5X D1P 2X D1, D1 is the major diameter of the screw (i.e. the maximum outer diameter of the screw thread part on the screw 21). Unidirectional means that the thread on the screw 21 can only be one of left-handed or right-handed. In this embodiment, the lead P =1.67 × D1 of the screw and the number of flights N = 6.

The gear shift sleeve driving mechanism includes a transmission member 41 and a transmission member driving mechanism. The transmission member 41 is provided with a mounting hole 410, the wall of the mounting hole 410 is provided with a second multi-thread one-way thread 411 matched with the first multi-thread one-way thread 211, and the screw rod 21 passes through the mounting hole 410 and is in threaded connection with the transmission member 41. The transmission member driving mechanism is used for driving the transmission member 41 to rotate. In the present embodiment, the transmission member 41 is a gear, preferably a bevel gear, the tooth 412 of the bevel gear 41 is provided on the end surface of the bevel gear 41, and the mounting hole 410 is a central hole of the bevel gear 41. The transmission member driving mechanism includes a driving motor 42 and a driving gear 43, and the driving gear 43 is connected to the main shaft 421 of the driving motor 42 to rotate synchronously with the main shaft 421 of the driving motor 42. The driving gear 43 is a bevel gear that is matched with the bevel gear 41, and the two form a bevel gear pair.

The guide sleeve 3 is fixedly mounted on a housing 5 of the gear selecting and shifting actuator, and the freedom degree of the rotation direction and the axial displacement of the guide sleeve is limited, and the fixed mounting mode includes but is not limited to welding, interference fit and the like. The inner wall of the guide sleeve 3 is provided with a first limiting structure and a second limiting structure, the first limiting structure is used for limiting the transmission piece 41 to move along the axial direction, and the second limiting structure is used for limiting the gear selecting sleeve 2 to rotate. In this first embodiment, the first limiting structure includes a first groove 31, at least a portion of the bevel gear 41 extends into the first groove 31, and both end surfaces of the bevel gear 41 respectively abut against both side surfaces of the first groove 31, so that the bevel gear 41 is immovable in the axial direction. The second limiting structure comprises a plurality of second grooves 32 extending along the axial direction parallel to the screw 21, and the plurality of second grooves 32 are distributed along the circumferential direction. The mounting portion 22 has a plurality of protrusions 222 protruding in the radial direction, the number of the protrusions 222 is the same as the number of the second grooves 32, the plurality of protrusions 222 are distributed at intervals along the circumferential direction of the mounting portion 22 and extend into the plurality of second grooves 32 in a one-to-one correspondence manner, and two side surfaces of at least one protrusion 222 respectively abut against two side walls of the corresponding second groove, so that the gear selection sleeve 2 is limited from rotating.

In this embodiment, the top surface 222a of the bump 222 is a guiding support portion, and the side surface 222b of the bump 22 is a rotation stop portion. The second grooves 32 are defined by a plurality of limiting ribs arranged on the inner wall of the guide sleeve. The gear selecting sleeve 2 plays roles of radial support, guide and radial limit besides transmitting motion, and is a functional part integrating multiple functions. The advantage of this is that not only can reduce the quantity of the transmission part in the system, make the structure more compact; but also can simplify the product process flow and facilitate assembly and manufacture; meanwhile, the cost can be reduced, and the marketization is facilitated.

When the driving motor 42 rotates, the bevel gear 41 is driven to rotate, the rotation of the bevel gear 41 drives the gear selecting sleeve 2 to move linearly, the linear motion of the gear selecting sleeve 2 drives the gear selecting and shifting shaft 1 to move linearly, and therefore the gear selecting operation is completed.

The contact surface of the transmission screw thread during matching is related to the number of thread lines, namely the more the number of the thread lines is, the more the contact area is, the lower the shearing strength is under the same torque, and the service life of the product can be prolonged. Compared with single thread, the gear selecting sleeve 2 of the embodiment is provided with the multi-thread one-way thread, so that the strength of the part can be greatly increased, the shearing strength of the part is reduced, and the service life of the product is prolonged.

The gear selecting sleeve 2 of the embodiment has a large lead (P is not less than 1.5X D1 and not more than 2X D1), but the large diameter and the small diameter are smaller than the standard threads by more than 1 time, so that the transmission ratio of the transmission mechanism is increased, the volume cannot be correspondingly increased, and the light weight of the product is realized.

The transmission structure of the embodiment is more suitable for the field of large-lead and light-weight thread transmission. A large lead means a large transmission ratio, which is advantageous in some application scenarios. In addition, as emission regulations become more stringent, the principle of weight reduction also becomes an important principle in product design. Therefore, there is an urgent need to provide a transmission structure having both a large lead and a small large diameter. However, with the conventional thread design, when the lead/major diameter ratio is increased, the inclination degree of the thread is increased, the contact area between the bevel gear 41 and the thread of the gear selection sleeve 2 is reduced for the bevel gear 41 with the same thickness, and the distribution uniformity of the thread on the bevel gear and the gear selection sleeve is reduced (for example, for the bevel gear with the conventional thickness, the thread is uniformly distributed in one circle on the inner circumference of the bevel gear to only be distributed in one side partial area), which means that under the same torque, the shearing strength between the thread and the bevel gear is higher, the wear of the bevel gear and the gear selection sleeve is more non-uniform, further the eccentricity of the bevel gear is increased, the service life of the product is greatly reduced, abnormal sound is generated, the transmission precision is reduced, and even transmission faults are caused. If the thickness of the bevel gear is increased, the size and the weight of the transmission structure are greatly increased, and the lightweight principle is not met. In addition, another problem caused by the increase of the lead is that the thread thickness of the thread on the gear selecting sleeve or the bevel gear is too thick and the thread groove is too narrow due to the increase of the thread pitch, and the thread after injection molding is seriously deformed and has large size deviation due to the shrinkage of materials in the process of injection molding of products; in addition, when the number of the threads is low, the distance between the edge of the gear selecting sleeve and the threads in the axial direction is large in a partial area, so that the thread deformation caused by the shrinkage of the material in the partial area is more obvious; the plastic injection processing gear selection sleeve has the advantages of low yield, poor precision, large processing difficulty and high cost, abnormal sound, poor transmission precision and even transmission faults can be generated in the using process, and the service life of a product is greatly reduced.

In this embodiment, for an application scenario with a large lead/major diameter ratio, the number N of spirals of the screw is selected as: n is more than or equal to 5 and less than or equal to 7, the thread density on the gear selection sleeve is increased by using a higher number of threads, and the contact area between the bevel gear and the threads of the gear selection sleeve is increased under the condition that the size of the bevel gear is not increased, so that the shearing strength of the threads and the bevel gear is reduced, the uniformity of thread distribution is increased, the abrasion of the bevel gear and the gear selection sleeve is more uniform, the eccentric condition of the bevel gear is avoided, the service life of a product is further prolonged, abnormal sound is avoided, the transmission precision is improved, and faults are avoided. In addition, when lead/major diameter ratio is great, select higher screw thread number, then the tooth thickness of screw thread can reduce, the screw thread distribution is also more balanced, select shelves cover edge and the interval of screw thread also can reduce in the axial, at product injection moulding's in-process, because the material shrinks and leads to the product after moulding plastics to warp littleer, thereby further improved the yields and the precision of product, reduced the cost and the processing degree of difficulty of product, the abnormal sound can not appear in the product use, the transmission precision is higher.

In other embodiments, one of the first limiting structure and the second limiting structure may be disposed on the guide sleeve 2, and the other of the first limiting structure and the second limiting structure may be disposed on the housing 5 of the gear selecting and shifting actuator, in other words, the limiting component of the gear selecting and shifting actuator is composed of the guide sleeve 3 and the housing 5.

Fig. 9 and 10 show the structure of a shift actuator according to a second embodiment of the present invention. The second embodiment is mainly different from the first embodiment in that the guide sleeve 3 is eliminated, and the first groove 31a as the first limiting structure and the second groove 32a as the second limiting structure are both arranged on the housing 5a of the gear selecting and shifting actuator, that is, the housing 5a is used as a limiting component of the gear selecting and shifting actuator. Wherein, the first groove 31a is defined by a step 51a and a stop block 52a which are arranged on the inner wall of the shell 5a together to limit the axial position of the bevel gear 41, and the second groove 32a is directly arranged on the inner wall of the shell 5a to limit the rotational freedom of the gear selecting sleeve 2.

Fig. 11 shows a structure of a shift actuator according to a third embodiment of the present invention. The third embodiment is mainly different from the first embodiment in that the guide sleeve 3 is eliminated, and the first groove 31b as the first limiting structure and the second groove 32b as the second limiting structure are both arranged on the housing 5b of the gear selecting and shifting actuator, that is, the housing 5b is used as a limiting component of the gear selecting and shifting actuator. The housing 5b is composed of a first housing portion 5C and a second housing portion 5D, the first groove 31b is defined by a step 51b disposed at one end of the housing 5C and a stopper 52b disposed at one end of the housing 5D to limit the axial position of the bevel gear 41, and the second groove 32b is directly disposed on the inner wall of the second housing portion 5D to limit the rotational degree of freedom of the shift sleeve 2.

Claims

1. A gear selecting and shifting actuator comprises a gear selecting and shifting shaft, a gear selecting sleeve and a gear selecting sleeve driving mechanism; the gear selection sleeve driving mechanism is used for driving the gear selection sleeve to move along the axial direction, and the gear selection and shifting shaft is connected with the gear selection sleeve so as to synchronously move along with the gear selection sleeve;

the gear selecting sleeve driving mechanism comprises a transmission part and a transmission part driving mechanism; the transmission part is provided with a mounting hole, the hole wall of the mounting hole is provided with a second multi-thread one-way thread matched with the first multi-thread one-way thread, and the screw rod penetrates through the mounting hole and is in spiral connection with the transmission part; the transmission piece driving mechanism is used for driving the transmission piece to rotate;

the gear selecting and shifting actuator further comprises a limiting component, wherein the limiting component is provided with a first limiting structure and a second limiting structure, the first limiting structure is used for limiting the transmission piece to move along the axial direction, and the second limiting structure is used for limiting the gear selecting sleeve to rotate.

2. The gear selecting and shifting actuator according to claim 1, wherein the number N of screw threads of the screw satisfies: n is more than or equal to 5 and less than or equal to 7.

3. The gear selecting and shifting actuator according to claim 1 or 2, wherein the lead P of the screw is 1.5X D1 ≦ P ≦ 2X D1, and D1 is the major diameter of the screw.

4. The gear selection actuator of claim 1 wherein said gear selection sleeve includes a mounting portion, one end of said threaded rod being connected to said mounting portion;

the second limiting structure is matched with the mounting part to limit the rotation of the gear selecting sleeve.

5. The gear selecting and shifting actuator of claim 1, wherein the limiting component is a guide sleeve, and the guide sleeve is fixedly mounted on a housing of the gear selecting and shifting actuator.

6. The gear selection and shift actuator of claim 1 wherein the limiting member is a housing of the gear selection and shift actuator.

7. The gear selection and shift actuator of claim 5 or 6 wherein the first limit feature comprises a first recess, at least a portion of the transmission member extending into the first recess.

8. The gear selection actuator according to claim 5 or 6, wherein the second limit structure comprises a second groove extending in a direction parallel to the axis of the screw;

the gear selecting sleeve comprises an installation part, and one end of the screw rod is connected with the installation part; the mounting portion has a radially projecting projection extending into the second recess.

9. The gear selecting and shifting actuator according to claim 8, wherein the number of the second grooves is a plurality of second grooves distributed along the circumferential direction;

the quantity of lug with the quantity of second recess is the same, and a plurality of lugs are along the circumference interval distribution of installation department to in stretching into many second recesses one-to-one, wherein two sides of at least one lug support against two lateral walls that correspond the second recess respectively.

10. The gear selecting and shifting actuator according to claim 1, wherein the transmission member is a bevel gear, the tooth shape of the bevel gear is arranged on the end surface of the bevel gear, and the mounting hole is a central hole of the bevel gear.