Electrically-driven loop-free synchronizer

Abstract

The electrically-driven ring-free synchronizer comprises a gear sleeve, a gear hub and an elastic positioning part, the gear sleeve is fixed in the circumferential direction and can be installed outside the gear hub in an axial moving mode. The elastic positioning part is arranged between the gear sleeve and the gear hub; a first combination gear ring is arranged on the gear sleeve, a second combination gear ring capable of being combined with the first combination gear ring is arranged on one side or two sides of the gear hub, and the opposite end faces of the first combination gear ring and the second combination gear ring are arranged in a plane mode. According to the utility model, the manufacturing cost can be effectively reduced, and the axial space utilization rate of the electric driving system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of synchronizer, especially to a kind of electric drive ringless synchronizer. BACKGROUND

[0002] Synchronizer is one of the core components of mechanical transmission, and is widely used in various automobile transmissions. The main function is to connect the input and output ends after synchronizing the speed, and then transmit torque and speed.

[0003] In the prior art, after the inner cone surface of the synchronizer assembly contacts the outer cone surface of the gear ring to be engaged, the gear speed rapidly decreases (or increases) to the same speed as the synchronizer ring under the action of friction torque. The two rotate synchronously, and the gear speed relative to the synchronizer ring is zero, and the inertia torque disappears at the same time. At this time, under the action of the shifting lever force, the engagement sleeve engages with the synchronizer ring gear ring and further engages with the gear ring to be engaged, thereby completing the gear shifting.

[0004] However, when the synchronizer is applied to an electric drive system, the inertia of the motor rotor is large, and the performance requirements of the synchronizer ring are high, which makes the synchronizer ring have a high failure risk during its service life. At the same time, the existence of the synchronizer ring occupies a lot of axial space, which reduces the utilization rate of the axial space and makes it difficult to adapt to the layout of the compact electric drive system. In addition, the taper surfaces provided on the engagement gear ring and the synchronizer ring gear ring increase the axial space occupied and thus reduce the utilization rate of the axial space of the electric drive system. UTILITY MODEL CONTENTS

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide an electric drive ringless synchronizer to greatly reduce the cost and improve the utilization rate of the axial space of the electric drive system.

[0006] The utility model provides an electric drive ringless synchronizer, which comprises a tooth sleeve, a tooth hub and an elastic positioning part. The tooth sleeve is fixed circumferentially and can move axially on the tooth hub. The elastic positioning part is arranged between the tooth sleeve and the tooth hub. The tooth sleeve is provided with a first engagement gear ring, and one side or both sides of the tooth hub are provided with a second engagement gear ring that can engage with the first engagement gear ring. The end faces of the first engagement gear ring and the second engagement gear ring opposite to each other are flat.

[0007] Preferably, the first engagement gear ring comprises a plurality of first engagement teeth uniformly distributed circumferentially, and the tooth slots are provided between adjacent first engagement teeth for the second engagement gear ring to enter and exit axially.

[0008] Preferably, the second engaging gear ring comprises a plurality of second engaging teeth distributed evenly in the circumferential direction, the second engaging teeth have driving surfaces, the tooth slots have driven surfaces matched with the driving surfaces; the driving surfaces push the driven surfaces to rotate, achieving power transmission.

[0009] Preferably, the second engaging teeth are in clearance fit with the tooth slots.

[0010] Preferably, the elastic positioning part comprises a positioning member and a spring, the spring is arranged in a positioning hole outside the tooth hub, the positioning member is arranged on the top of the spring and abuts against the spring, and the end of the positioning member abuts against the inclined slot wall on both sides of the positioning slot of the tooth sleeve.

[0011] Preferably, the end of the positioning member is provided with a ball head end face, and the ball head end face abuts against the inclined slot wall.

[0012] Preferably, the end of the positioning member is provided with a ball head end face, and the ball head end face abuts against the inclined slot wall.

[0013] Preferably, the end of the positioning member is provided with a ball head end face, and the ball head end face abuts against the inclined slot wall.

[0014] Preferably, the end of the positioning member is provided with a ball head end face, and the ball head end face abuts against the inclined slot wall.

[0015] As described above, the electric drive ringless synchronizer has the following beneficial effects:

[0016] The utility model discloses a first engaging gear ring and second engaging gear ring opposite end face are provided as plane, one aspect, through the taper structure of first engaging gear ring and second engaging gear ring is removed, and the manufacturing cost is reduced greatly, on the other hand, through reducing the axial space of first engaging gear ring and second engaging gear ring, and then the axial space utilization of electric drive system is improved greatly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is three -dimensional schematic view of electric drive ringless synchronizer of an embodiment of the utility model provides;

[0018] Figure 2 It is the front view of Figure 1 ;

[0019] Figure 3 It is the side view of Figure 1 ;

[0020] Figure 4 It is the sectional view of Figure 1 A-A;

[0021] Figure 5 It is the sectional view of Figure 4a partial enlarged view C-1 of the first embodiment of the tooth cover;

[0022] Figure 6 is Figure 4 a partial enlarged view C-2 of the second embodiment of the tooth cover;

[0023] Figure 7 is Figure 4 a partial enlarged view C-3 of the third embodiment of the tooth cover;

[0024] Figure 8 is a three-dimensional schematic view of a tooth cover;

[0025] Figure 9 is Figure 8 a partial enlarged view.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 100, tooth cover; 110, first engaging gear ring; 111, first engaging tooth; 112, tooth groove; 120, tooth cover positioning groove; 200, tooth hub; 210, second engaging gear ring; 211, second engaging tooth; 220, positioning hole; 300, elastic positioning part; 310, positioning member; 320, spring. DETAILED DESCRIPTION

[0028] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0029] It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the specification are only for the convenience of clear understanding of the description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship without substantially changing the technical content is also considered as the scope of the present application.

[0030] As Figures 1 to 9As shown, an embodiment of an electrically driven ringless synchronizer includes a gear sleeve 100, a gear hub 200, and elastic positioning parts 300. The gear sleeve 100 is sleeved to the outside of the gear hub 200 and can move axially along the gear hub 100. A plurality of elastic positioning parts 300 are arranged between the gear sleeve 100 and the gear hub 200 and are distributed in a circumferential direction. The end of the elastic positioning part 300 abuts against the gear sleeve 100 to ensure that the gear sleeve 100 is fixed in a circumferential direction on the gear hub 200. The gear sleeve 100 is provided with a first combined gear ring 110. One side or both sides of the gear hub 200 are provided with a second combined gear ring 210 that can be combined with the first combined gear ring 110. The end faces of the first combined gear ring 110 and the second combined gear ring 210 opposite to each other are arranged in a plane to improve the service life.

[0031] In use, when the automobile is in a neutral state, the first combined gear ring 110 on the gear sleeve 100 is in a separated state from the second combined gear ring 210. When the automobile needs to be in a gear state, the gear sleeve 100 is driven by a yoke motor to move axially. The gear sleeve 100 drives the gear hub 200 to move axially together and approach the second combined gear ring 210 to be combined through the elastic positioning part 300 until the end face of the gear hub 200 contacts the second combined gear ring 210. At this time, the second combined gear ring 210 applies an axial reaction force to the gear hub 200. The gear sleeve 100 is pressed downward by the elastic positioning part to continue to move axially under the pushing of the yoke until the first combined gear ring 110 and the second combined gear ring 210 are combined. It should be noted that, in this gear shifting process, the gear on the input shaft connected with the motor drives the second combined gear ring 210 to rotate, and the output shaft connected with the wheel drives the gear hub 200 and the gear sleeve 100 to rotate. Before gear shifting, the rotating speed of the gear sleeve 100 is different from that of the second combined gear ring 210. The rotating speed of the second combined gear ring 210 needs to be controlled to be the same as that of the gear sleeve 100. In the gear shifting process, when the angle of the first combined gear ring 110 is inconsistent with that of the second combined gear ring 210, the first combined gear ring 110 will collide with the second combined gear ring 210 for the first time when the first combined gear ring 110 moves axially to be combined with the second combined gear ring 210, and a signal is generated. The signal is fed back to the driving motor of the input shaft by the yoke motor. At this time, the first combined gear ring 110 is combined with the second combined gear ring 210 through the fine adjustment of the driving motor of the input shaft. The second combined gear ring 211 and the gear groove 112 are in a gap fit.

[0032] When the gear needs to be shifted backward, the gear sleeve 100 is driven by the yoke to move axially away from the second combined gear ring 210, so that the first combined gear ring 110 and the second combined gear ring 210 are separated.

[0033] In an embodiment, as shown in the accompanying drawings, Figure 9As shown, the first coupling gear ring 110 includes a plurality of circumferentially uniformly distributed first coupling teeth 111, and a tooth groove 112 is arranged between adjacent first coupling teeth 111 for the axial entry of the second coupling gear ring 210. The second coupling gear ring 210 includes a plurality of circumferentially uniformly distributed second coupling teeth 211, and the second coupling teeth 211 have a driving surface, and the tooth groove 112 has a driven surface that is in contact with the driving surface.

[0034] In use, under the shifting of the shifting fork, the rotating tooth groove 112 moves in the axial direction to the direction close to the second coupling teeth 211 until the second coupling teeth 211 enter the tooth groove 112 to a predetermined position, that is, the end surface of the second coupling teeth 211 is in abutment with the side wall of the tooth groove 112, and then the movement is stopped. The driving surface of the second coupling teeth 211 applies a driving force to the passive surface of the tooth groove 112, drives the tooth groove 112 and the tooth hub 200 to rotate together, and further drives the output shaft to rotate.

[0035] Further, the driving surface and the driven surface are both arranged as inclined surfaces, and when the driving surface applies a driving force to the driven surface, axial and radial components can be provided, wherein the axial component can enable the second coupling teeth 211 and the tooth groove 112 to be locked, so as to avoid disengagement of the two during rotation.

[0036] In an embodiment, as shown in the figure, Figures 4 to 7 The elastic positioning part 300 includes a positioning piece 310 and a spring 320, the spring 320 is arranged in the positioning hole 220 outside the tooth hub 200, the positioning piece 300 is arranged on the top of the spring 320 and is in abutment with the spring 320, the end of the positioning piece 310 is in abutment with the inclined groove wall on both sides of the tooth sleeve positioning groove 120, which can ensure that the tooth sleeve 100 is fixed on the tooth hub 200, and on the other hand, during gear shifting, the shifting fork drives the tooth sleeve 100 to move axially and towards the second coupling gear ring 110, and under the action of the positioning piece 310, the tooth hub 200 is also driven to move axially until the end surface of the tooth hub 200 is in contact with the second coupling gear ring 110, and the second coupling gear ring 110 applies a counterforce to the tooth hub 200. At this time, the shifting fork motor drives the shifting fork to continue to move the tooth sleeve 100 axially, the tooth sleeve positioning groove 120 overcomes the spring force to press down the positioning piece 310 and continuously moves axially until the first coupling ring 110 on the tooth sleeve 100 is coupled with the second coupling gear ring 210. The positioning piece 310 is arranged as a whole in a spherical shape.

[0037] In another embodiment, as shown in the figure, Figure 6 The end of the positioning piece 310 is provided with a spherical head end surface, and the main body of the positioning piece 310 can be arranged in a cylindrical shape. In use, the spherical head end surface is in abutment with the inclined groove wall of the positioning groove, so that during the axial movement of the tooth sleeve 100, the inclined groove wall can provide a downward component to the spherical head end surface to overcome the spring force, and further ensure that the first coupling ring 110 on the tooth sleeve 100 is coupled with the second coupling gear ring 210.

[0038] In another embodiment, as shown in Figure 7 The side wall of the positioning groove can also be provided in a V-shaped manner, and the end portion of the positioning member 310 is provided with a slope which is in contact with the inclined groove wall under the action of the spring. In use, the slope of the positioning member 310 is in contact with the inclined groove wall to ensure that the tooth cover 100 can provide a downward force to the slope through the inclined groove wall during axial movement, so as to overcome the spring force and ensure that the first combination ring 110 on the tooth cover 100 is combined with the second combination ring 210.

[0039] In summary, the utility model discloses a first combination ring and a second combination ring opposite end face is provided as a plane, on the one hand, by removing the taper structure on the first combination ring and the second combination ring, the manufacturing cost is greatly reduced, on the other hand, by reducing the axial space of the first combination ring and the second combination ring, and then the axial space utilization rate of the electric drive system is greatly improved.

[0040] The above embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An electrically driven ringless synchronizer, characterized in that The application relates to a toothed sleeve (100), a toothed hub (200) and an elastic positioning part (300), wherein the toothed sleeve (100) is fixed in the circumferential direction and can be axially moved and is installed outside the toothed hub (200); the elastic positioning part (300) is arranged between the toothed sleeve (100) and the toothed hub (200); a first combined gear ring (110) is arranged on the toothed sleeve (100), one side or both sides of the toothed hub (200) are provided with a second combined gear ring (210) capable of being combined with the first combined gear ring (110), and the end faces of the first combined gear ring (110) and the second combined gear ring (210) are arranged in a plane.

2. The electrically driven loopless synchronizer of claim 1, wherein, The first combined gear ring (110) comprises a plurality of first combined teeth (111) uniformly distributed in the circumferential direction, and a tooth groove (112) for the axial entry and exit of the second combined gear ring (210) is arranged between adjacent first combined teeth (111).

3. The electrically driven loopless synchronizer of claim 2, wherein, The second combined gear ring (210) comprises a plurality of second combined teeth (211) uniformly distributed in the circumferential direction, the second combined teeth (211) have a driving face, the tooth groove (112) has a driven face matched with the driving face, the driving face pushes the driven face to rotate, and power transmission is realized.

4. The electrically driven ringless synchronizer of claim 3, wherein, The second combined teeth (211) and the tooth groove (112) are gap-fitted.

5. The electrically driven loopless synchronizer of claim 1, wherein, The elastic positioning part (300) comprises a positioning piece (310) and a spring (320), the spring (320) is arranged in a positioning hole (220) outside the toothed hub (200), the positioning piece (310) is arranged on the top of the spring (320) and abuts against the spring (320), and the end of the positioning piece (310) abuts against the inclined groove wall on both sides of the toothed sleeve positioning groove (120).

6. The electrically driven ringless synchronizer of claim 5, wherein, The end of the positioning piece (310) is provided with a ball head end face, and the ball head end face abuts against the inclined groove wall.

7. The electrically driven loopless synchronizer of claim 5, wherein, The end of the positioning piece (310) is provided with a ball head end face, and the ball head end face abuts against the inclined groove wall.

8. The electrically driven loopless synchronizer of claim 5, wherein, The end of the positioning piece (310) is provided with a ball head end face, and the ball head end face abuts against the inclined groove wall.

9. The electrically driven loopless synchronizer of claim 3, wherein, The end of the positioning piece (310) is provided with a ball head end face, and the ball head end face abuts against the inclined groove wall. The driving face and the driven face are both arranged in an inclined face, so that the second combined teeth (211) and the tooth groove (112) are locked.

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