Gear shifting executing mechanism suitable for hybrid gearbox

Abstract

The invention relates to the technical field of hybrid gearbox manufacturing, in particular to a gear shifting executing mechanism suitable for a hybrid gearbox. The gear shifting shaft is assembled in the hybrid gearbox body, and the axial displacement freedom degree of the gear shifting shaft is not limited. The gear shifting shaft is sleeved with the force transmission piece, and the axial displacement stroke of the force transmission piece is limited within a set interval. The elastic piece is arranged on the gear shifting shaft in a sleeving mode and is elastically compressed between the force transmission piece and the limiting ring. In the gear shifting synchronization process, the force transmission piece performs displacement movement along the gear shifting shaft in a set stroke interval, meanwhile, the elastic piece elastically deforms due to compression, or after gear shifting operation is completed, impact energy pre-applied to the gear shifting fork by the gear sleeve is partially converted into kinetic energy of the gear shifting shaft, and the kinetic energy is converted into kinetic energy of the gear shifting shaft. And the gear shifting fork performs self-avoiding motion under the action of instantaneous impact force, so that the phenomenon that the force transmission piece and the gear shifting fork are damaged due to the action of rigid impact force is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid transmission manufacturing, and in particular to a gear shift actuator suitable for a hybrid transmission. Background Art

[0002] The hybrid transmission of new energy vehicles is equipped with a built-in shift actuator, which mainly achieves gear shifting by regulating the switching of power transmission of the gear shaft system to change the power transmission direction and transmission ratio.

[0003] As far as the current technical status of the shift actuator is concerned, the shift fork and the force transmission member are both fitted with the shift shaft and fixed as one. The shift force acts directly on the force transmission member, and the shift shaft can perform axial displacement movement. During this process, the gear sleeve changes position due to the shifting force from the shift fork, so that it can be combined or separated with the shift gear, and finally achieve shifting. However, during the driving process of the vehicle, the hybrid transmission needs to be kept in a high-speed operation state for a long time. Affected by the design factor that the shift fork and the force transmission member are both fixed to the shift shaft as one, during the synchronous shifting process, the force transmission member is easily damaged due to the rigid impact force from the shift hub, or, after the shifting operation is completed, the shift fork is easily damaged due to the rigid impact force from the gear sleeve, and even worse, the shift fork claw occasionally breaks accidentally. And due to the influence of the rigid impact force, the working noise of the shift actuator is relatively large, which is not conducive to the improvement of the driving experience. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the invention

[0004] Therefore, in view of the above-mentioned existing problems and defects, the present invention collects relevant information, conducts multiple evaluations and considerations, and undergoes continuous experiments and modifications by technicians with many years of R&D experience in this industry, which ultimately leads to the emergence of a shift actuator suitable for a hybrid transmission.

[0005] In order to solve the above technical problems, the present invention relates to a shift actuator suitable for a hybrid transmission, comprising a shift power generating unit, a shift power transmission assembly, a shift shaft, a shift fork and a gear sleeve. The shift shaft is assembled in the hybrid transmission body. The shift fork is fitted with the shift shaft and fixed as a whole. The shift force generated by the shift power generating unit is transmitted to the shift shaft via the shift power transmission assembly, the shift fork synchronously performs axial displacement movement following the shift shaft, and the gear sleeve changes position due to the shifting force from the shift fork, so as to achieve engagement or separation with the shift gear. Relative to the hybrid transmission body, the shift shaft has an axial displacement degree of freedom. The shift power transmission assembly comprises a force transmission member, a limit ring and an elastic member. The force transmission member is fitted on the shift shaft, and its circumferential rotational degree of freedom is limited to zero, and the axial displacement stroke is limited to a set range. The limit ring is installed on the shift shaft. The elastic member is also sleeved on the shift shaft, and is elastically compressed between the force transmission member and the limiting ring.

[0006] As a further improvement of the technical solution disclosed in the present invention, the limiting ring is preferably an open retaining ring. An annular groove matching the open retaining ring is formed on the shift shaft.

[0007] Of course, as another modified design of the above technical solution, the limiting ring can also be preferably an optical axis fixing ring.

[0008] As a further improvement of the technical solution disclosed in the present invention, the elastic member is preferably a columnar spring or an elastic plastic sleeve.

[0009] As a further improvement of the technical solution disclosed in the present invention, the shift fork is fixedly connected to the shift shaft by means of the first pin shaft. The shift fork and the shift shaft are respectively formed with an insertion through hole and a first insertion hole for the first pin shaft to be inserted.

[0010] As a further improvement of the technical solution disclosed in the present invention, the shift power transmission assembly also includes a second pin shaft. The force transmission member is composed of an axial sleeve portion and a radial transmission protrusion portion. The axial sleeve portion is sleeved on the shift shaft. The radial transmission protrusion portion directly bears the shift force generated by the shift power generating portion, and is formed by the circumferential side wall of the axial sleeve portion extending along its radial direction. The second pin shaft crosses the shift shaft and penetrates the circumferential side wall of the axial sleeve portion. A second insertion hole for the second pin shaft to cross is formed on the shift shaft. A long waist-shaped through hole for the second pin shaft to pass through is formed on the circumferential side wall of the axial sleeve portion. In the process of the force transmission member performing axial displacement movement due to the shift force from the shift power generating portion, the axial displacement stroke of the force transmission member is limited to a set range due to the long waist-shaped through hole.

[0011] As a further improvement of the technical solution disclosed in the present invention, the shift power generating unit includes a shift execution motor assembly and a shift hub. A shift groove for the radial transmission protrusion to extend into is formed on the peripheral side wall of the shift hub. In the process of the shift hub performing circumferential rotation due to the torque from the shift execution motor assembly, the radial transmission protrusion is always subjected to the axial force component from the shift groove, so that the force transmission member can perform axial displacement movement in a directional manner.

[0012] By adopting the above technical solution, when the shift actuator is assembled relative to the hybrid transmission, the force transmission member is mounted on the shift shaft, and its axial displacement freedom is not restricted, and the force transmission member is always subjected to the elastic force from the elastic member. During the shift synchronization process, the force transmission member performs displacement movement along the shift shaft within the set stroke range due to the shift force from the shift hub. At the same time, the elastic member stores elastic potential energy due to compression, thereby effectively avoiding the force transmission member from being damaged by the rigid impact force. Alternatively, after the shift operation is completed, thanks to the fact that the axial displacement freedom of the shift shaft is not restricted, the impact energy pre-applied by the gear sleeve to the shift fork can be immediately partially converted into the kinetic energy of the shift shaft, and the shift fork is subjected to the instantaneous impact force and performs self-avoidance movement, thereby effectively avoiding the shift fork from being damaged by the rigid impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, 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 paying creative work.

[0014] Figure 1 It is a three-dimensional schematic diagram from one perspective of the shift actuator mechanism applicable to a hybrid transmission disclosed in the present invention.

[0015] Figure 2 It is a three-dimensional schematic diagram from another perspective of the shift actuator mechanism applicable to a hybrid transmission disclosed in the present invention.

[0016] Figure 3 yes Figure 1 Front view of .

[0017] Figure 4 yes Figure 3 AA section view.

[0018] Figure 5 yes Figure 3 BB cross-sectional view.

[0019] Figure 6 It is a three-dimensional schematic diagram of a force transmission component in a shift actuator mechanism applicable to a hybrid transmission disclosed in the present invention.

[0020] Figure 7 It is a three-dimensional schematic diagram of a shift shaft in a shift actuator mechanism applicable to a hybrid transmission disclosed in the present invention.

[0021] Figure 8 It is a three-dimensional schematic diagram of a shift fork in a shift actuator mechanism applicable to a hybrid transmission disclosed in the present invention.

[0022] 1-shift power generation unit; 11-shift execution motor assembly; 12-shift hub; 121-shift groove; 2-shift power transmission assembly; 21-force transmission member; 211-axial sleeve portion; 2111-long waist-shaped through hole; 212-radial transmission protrusion; 22-open retaining ring; 23-columnar spring; 24-second pin shaft; 3-shift shaft; 31-annular groove; 32-first insertion hole; 33-second insertion hole; 4-shift fork; 41-insertion through hole; 5-first pin shaft. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 , Figure 2 The three-dimensional schematic diagrams of the shift actuator for hybrid transmission disclosed in the present invention from two different perspectives are shown. It can be seen that it is mainly assembled from several parts such as a shift power generating unit 1, a shift power transmission assembly 2, a shift shaft 3, a shift fork 4 and a gear sleeve (not shown in the figure). The shift shaft 3 is assembled in the hybrid transmission body (not shown in the figure), and its axial displacement movement is not restricted, and it has a certain amount of axial movement. The shift fork 4 is fitted with the shift shaft 3 and fixed as a whole. The shift force generated by the shift power generating unit 1 is transmitted to the shift shaft 3 via the shift power transmission assembly 2, and the shift fork 4 performs axial displacement movement synchronously with the shift shaft 3. The gear sleeve changes position due to the shifting force from the shift fork 4, so as to achieve the combination or separation with the shift gear.

[0024] Combined with Figure 3 , 4, 5, 7, and 8 clearly show that the shift fork 4 is fixedly connected to the shift shaft 3 by means of the first pin shaft 5. The shift fork 4 and the shift shaft 3 are respectively formed with an insertion through hole 41 and a first insertion hole 32 for the first pin shaft 5 to be inserted. The shift power transmission assembly 2 is mainly composed of several parts such as a force transmission member 21, an open retaining ring 22, and a cylindrical spring 23. The force transmission member 21 is mounted on the shift shaft 3, and its circumferential rotational degree of freedom is limited to zero, and the axial displacement stroke is limited to a set range. The open retaining ring 22 is installed on the shift shaft 3, and correspondingly, an annular groove 31 that matches the open retaining ring 22 is formed on the shift shaft 3. The cylindrical spring 23 is also mounted on the shift shaft 3, and it is elastically compressed between the force transmission member 21 and the open retaining ring 22.

[0025] like Figure 1 , 2 As shown in Figures 1 and 3, the shifting power generating unit 1 is mainly composed of a shifting motor assembly 11 and a shifting hub 12. A shifting groove 121 is formed on the peripheral side wall of the shifting hub 12 to guide the driving force transmission member 21. In the synchronous shifting process, the shifting hub 12 performs a circumferential rotational motion due to the torque from the shifting motor assembly 11, and the shifting force is transmitted to the shifting shaft 3 via the force transmission member 21. The shifting fork 4 synchronously performs an axial displacement motion following the shifting shaft 3, and the gear sleeve changes position due to the shifting force from the shifting fork 4.

[0026] When the shift actuator is assembled relative to the hybrid transmission, the force transmission member 21 is mounted on the shift shaft 3, and its axial displacement freedom is not restricted, and the force transmission member 21 is always subjected to the elastic force from the columnar spring 23. During the synchronous shifting process, the force transmission member 21 performs displacement movement along the shift shaft 3 within the set stroke range due to the shift force from the shift hub 12. At the same time, the columnar spring 23 stores elastic potential energy due to compression, thereby effectively avoiding the force transmission member 21 from being damaged by the rigid impact force. Alternatively, after the shifting operation is completed, thanks to the fact that the axial displacement freedom of the shift shaft 3 is not restricted, the impact energy pre-applied by the gear sleeve to the shift fork 4 can be immediately partially converted into the kinetic energy of the shift shaft 3, and the shift fork 4 is subjected to the instantaneous impact force and performs self-avoidance movement, thereby effectively avoiding the shift fork 4 from being damaged by the rigid impact force.

[0027] As is known, according to design common sense, the force transmission member 21 can adopt a variety of design structures to achieve the design purpose of transmitting the shift force. However, here we recommend a design structure that is simple, easy to manufacture and implement, and has accurate and efficient transmission of the shift force, specifically, as follows: Figure 1-4As shown in Figures 6 and 7, the force transmission member 21 is an integral member, which is composed of an axial sleeve portion 211 and a radial transmission protrusion 212. The axial sleeve portion 211 is sleeved on the shift shaft 3. The radial transmission protrusion 212 directly comes from the shift force of the shift hub 12, and is formed by the circumferential side wall of the axial sleeve portion 211 extending along its radial direction. The axial sleeve portion 211 is assembled with the shift shaft 3 by means of a second pin 24. The second pin 24 crosses the shift shaft 3 and passes through the circumferential side wall of the axial sleeve portion 211. A second insertion hole 33 is formed on the shift shaft 3 for the second pin 24 to cross. A long waist-shaped through hole 2111 is formed on the circumferential side wall of the axial sleeve portion 211 for the second pin 24 to pass through. During the process of the force transmission member 21 performing axial displacement movement due to the shifting force from the shifting power generating unit 1, due to the limiting effect of the second pin shaft 24, the circumferential rotational freedom of the force transmission member 21 is limited to zero, and limited by the length of the long waist-shaped through hole 2111, the axial displacement stroke of the force transmission member 21 is limited within the set range.

[0028] Generally speaking, the length of the long waist-shaped through hole 2111 is limited to between 12 mm and 18 mm, which means that the axial displacement stroke of the force transmission member 21 relative to the shift shaft 3 is limited to between 12 mm and 18 mm.

[0029] During the synchronous shifting process, the shift hub 12 performs circumferential rotation due to the torque from the shifting motor assembly 11. At the same time, the radial transmission protrusion 212 always extends into the shifting groove 121, and the force transmission member 21 is able to perform displacement along the shifting shaft 3 under the action of the guiding force. The axial displacement stroke of the force transmission member 21 is limited to the set range due to the length of the long waist-shaped through hole 2111, and during this process, the columnar spring 23 stores elastic potential energy due to compression, thereby effectively preventing the force transmission member 21 from being damaged due to the rigid impact force. When the shifting operation is completed, the elastic potential energy stored by the columnar spring 23 is released, and the force transmission member 21 performs axial displacement along the shifting shaft 3 until it returns to its original position. When the shift fork 4 is subjected to the instantaneous impact force from the gear sleeve, the shift shaft 3 can freely perform axial displacement movement, which means that part of the impact energy is instantly converted into the kinetic energy of the shift shaft 3, and the shift fork 4 is subjected to the instantaneous impact force and performs self-avoidance movement, thereby effectively avoiding the shift fork 4 from being damaged by the rigid impact force.

[0030] Finally, the following two points need to be explained: 1) As an alternative to the open retaining ring 22, in actual assembly, the optical axis fixing ring can also be used to achieve lateral blocking and limiting of the columnar spring 23; 2) As an alternative to the columnar spring 23, an elastic plastic sleeve can also be used to absorb the kinetic energy of the gear shift impact. The above two alternatives have their own advantages and disadvantages, and R&D personnel can choose the best one according to specific design requirements and actual application scenarios.

[0031] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shift actuator for a hybrid transmission, comprising a shift power generating unit, a shift power transmission assembly, a shift shaft, a shift fork and a gear sleeve; the shift shaft is assembled in a hybrid transmission body; the shift fork is fitted with the shift shaft and fixed as a whole; the shift force generated by the shift power generating unit is transmitted to the shift shaft via the shift power transmission assembly, the shift fork synchronously performs axial displacement movement with the shift shaft, the gear sleeve changes position due to the shifting force from the shift fork, and is able to be engaged with or separated from the shift gear, characterized in that: Relative to the hybrid transmission body, the shift shaft has axial displacement freedom; the shift power transmission assembly includes a force transmission member, a limit ring and an elastic member; the force transmission member is mounted on the shift shaft, its circumferential rotation freedom is limited to zero, and the axial displacement stroke is limited to a set range; the limit ring is installed on the shift shaft; the elastic member is also mounted on the shift shaft, and it is elastically compressed between the force transmission member and the limit ring.

2. The shift actuator for a hybrid transmission according to claim 1, characterized in that: The limiting ring is an open retaining ring; an annular groove matched with the open retaining ring is formed on the shift shaft.

3. The shift actuator for a hybrid transmission according to claim 1, characterized in that: The limiting ring is an optical axis fixing ring.

4. The shift actuator for a hybrid transmission according to claim 1, characterized in that: The elastic member is a columnar spring or an elastic plastic sleeve.

5. The shift actuator for a hybrid transmission according to claim 1, characterized in that: The shift fork is fixedly connected to the shift shaft by means of a first pin shaft; an insertion through hole and a first insertion hole for the first pin shaft to be installed are respectively formed on the shift fork and the shift shaft.

6. The shift actuator for a hybrid transmission according to any one of claims 1 to 5, characterized in that: The shift power transmission assembly also includes a second pin shaft; the force transmission member is composed of an axial sleeve portion and a radial transmission protrusion portion; the axial sleeve portion is based on the shift shaft; the radial transmission protrusion portion directly bears the shift force generated by the shift power generating portion, and is formed by the circumferential side wall of the axial sleeve portion extending radially; the second pin shaft crosses the shift shaft and passes through the circumferential side wall of the axial sleeve portion; a second insertion hole for the second pin shaft to cross is formed on the shift shaft; a long waist-shaped through hole for the second pin shaft to pass through is formed on the circumferential side wall of the axial sleeve portion; in the process of the force transmission member performing axial displacement movement due to the shift force from the shift power generating portion, the axial displacement stroke of the force transmission member is limited within a set range due to the long waist-shaped through hole.

7. The shift actuator for a hybrid transmission according to claim 6, characterized in that: The shift power generating unit includes a shift execution motor assembly and a shift hub; a shift groove for the radial transfer protrusion to extend into is formed on the peripheral side wall of the shift hub; in the process of the shift hub performing circumferential rotational motion due to the rotational torque from the shift execution motor assembly, the radial transfer protrusion is always subjected to the axial component force from the shift groove, so that the force transmission member can perform axial displacement motion in a direction.

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