Gearbox simple synchronizing device

Abstract

The application relates to a simple synchronizer device of a gearbox, and belongs to the technical field of automobile gearboxes. The simple synchronizer device comprises a gear shifting gear train which comprises a transmission shaft, a first gear and a reverse gear which are sleeved on the transmission shaft and are axially spaced on the transmission shaft, and annular grooves are formed on the sides adjacent to the first gear and the reverse gear; and the simple synchronizer device comprises a synchronizer sleeve which is engaged on the transmission shaft and is located between the first gear and the reverse gear, and a conical elastic snap ring which is arranged in the annular grooves of the first gear and the reverse gear and is in frictional engagement with the slope surface of the synchronizer sleeve, and the conical elastic snap ring is fixed in the annular grooves in the circumferential direction. When the gearbox is shifted, the synchronizer sleeve and the conical elastic snap ring are in frictional engagement, the rotational speed of the synchronizer sleeve and the first gear or the reverse gear is basically consistent, the synchronizer sleeve of the gearbox is smoothly engaged with the gear spline, and the automobile runs more stably.

Description

Technical Field

[0001] This application relates to the field of automotive transmission technology, and in particular to a simple synchronization device for a transmission. Background Technology

[0002] The traditional method of shifting to first gear or reverse gear is to use the synchronizer sleeve 7 to slide the first gear or reverse gear. Due to the large frictional resistance of this shifting mechanism, coupled with the resistance generated when the first gear or reverse gear engages due to asynchrony during shifting, the combined force of the two causes a two-stage feel or incomplete shifting when shifting to first gear or reverse gear.

[0003] When starting from a standstill and engaging reverse gear, the input shaft is at idle speed. After speed reduction, the speed difference between the first gear or reverse gear and the synchronizer sleeve 7 is small. The existing solution does not use a synchronizer, but instead uses the synchronizer sleeve 7 to slide and directly mesh with the gear spline for power transmission.

[0004] Since the input shaft is idling, after the speed reduction transmission, the first gear or reverse gear and the synchronizer sleeve 7 form a speed difference. The speed difference between the first gear or reverse gear and the input shaft is more than 100 r / min. When the synchronizer sleeve 7 slides and meshes into the gear spline, it will cause impact of the gear spline engaging teeth and spline tooth breakage.

[0005] Therefore, it takes a relatively long time to shift into first gear or reverse when the vehicle is stationary. If you shift into first gear or reverse immediately after depressing the clutch, the transmission drive shaft will still be running, making shifting difficult and causing gear grinding, which will reduce the life of the gears. Summary of the Invention

[0006] This application provides a simplified synchronization device for a gearbox to solve the problem of meshing impact when the synchronizer sleeve 7 engages with the first gear and reverse gear in the splined engagement of the synchronizer sleeve 7 with the first gear and reverse gear in the related art.

[0007] This application provides a simplified synchronization device for a gearbox, comprising:

[0008] A gear shifting system includes a drive shaft, a first gear and a reverse gear loosely fitted on the drive shaft, the first gear and the reverse gear being axially spaced apart on the drive shaft, and an annular groove being radially formed on the adjacent side of the first gear and the reverse gear.

[0009] A simple synchronizer includes a synchronizer sleeve meshing on a drive shaft and located between a first gear and a reverse gear. Both the first gear and the reverse gear have conical elastic retaining rings that frictionally engage with the slope of the synchronizer sleeve within their annular grooves. The conical elastic retaining rings are circumferentially fixed within the annular grooves.

[0010] In some embodiments: an annular weight reduction groove is axially provided on the adjacent side of the first gear and the reverse gear, and an annular groove is radially provided on the side wall of the annular weight reduction groove away from the drive shaft. The outer diameter of the annular weight reduction groove is larger than the outer diameter of the synchronizer sleeve, so that part of the synchronizer sleeve enters the annular weight reduction groove.

[0011] In some embodiments, the first gear and the reverse gear are rotatably connected to the transmission shaft via needle roller bearings, and the bottom of the annular weight reduction groove cooperates with the side of the synchronizer sleeve to form an axial limiting surface.

[0012] In some embodiments: the outer ring of the synchronizer sleeve is provided with a guide slope that frictionally engages with the conical elastic retainer, and the side of the conical elastic retainer near the synchronizer sleeve is provided with a guide cone that frictionally engages with the guide slope.

[0013] In some embodiments: the outer diameter of the annular groove is larger than the outer diameter of the conical elastic retaining ring, and the annular groove is provided with an elastic positioning member for elastically supporting the conical elastic retaining ring and the synchronizer sleeve to be coaxially arranged, and the elastic positioning member surrounds the outer periphery of the conical elastic retaining ring in the annular groove.

[0014] In some embodiments: a first notch is provided on the conical elastic retaining ring to make the conical elastic retaining ring have a "C" shape structure, a positioning protrusion is fixedly provided on the conical elastic retaining ring, a positioning groove for accommodating the positioning protrusion is axially provided on the adjacent side of the first gear and the reverse gear, and two retaining grooves are provided on the outer wall of the conical elastic retaining ring symmetrically arranged along the first notch.

[0015] In some embodiments: the elastic positioning member is a regular polygonal elastic ring surrounding the outer periphery of the conical elastic retaining ring, the inner ring of the elastic positioning member is in multi-point internal tangential engagement with the outer ring of the conical elastic retaining ring, and the elastic positioning member is provided with a second notch to avoid the positioning protrusion, so that the elastic positioning member has a "C" shaped structure.

[0016] In some embodiments: the first gear and the reverse gear each have three positioning grooves, two of which expose two slots on the conical elastic retaining ring, and the three positioning grooves on the first gear and the reverse gear are all evenly distributed in a circle.

[0017] In some embodiments: the inner circle of the synchronizer sleeve is provided with internal splines that mesh with the drive shaft, and the outer wall of the drive shaft is provided with external splines that mesh with the synchronizer sleeve. The synchronizer sleeve slides back and forth along the axial direction of the drive shaft under the guidance of the internal and external splines.

[0018] In some embodiments: the first gear is fixedly provided with a first gear engagement tooth that meshes with the internal spline teeth of the synchronizer sleeve on the side near the synchronizer sleeve, and the reverse gear is fixedly provided with a reverse gear engagement tooth that meshes with the internal spline teeth of the synchronizer sleeve on the side near the synchronizer sleeve.

[0019] The beneficial effects of the technical solution provided in this application include:

[0020] This application provides a simplified synchronization device for a gearbox. The simplified synchronization device includes a gear shifting system comprising a drive shaft, a first gear and a reverse gear loosely fitted on the drive shaft, the first gear and reverse gear being axially spaced apart on the drive shaft, and an annular groove radially formed on the adjacent side of each gear; and a simplified synchronizer including a synchronizer sleeve meshing on the drive shaft and located between the first gear and the reverse gear. A conical elastic retaining ring is provided within the annular groove of the first gear and the reverse gear, engaging with the slope of the synchronizer sleeve. The conical elastic retaining ring is circumferentially fixed within the annular groove.

[0021] Therefore, the simplified synchronizer of this application has annular grooves radially formed on the side adjacent to the first gear and reverse gear. A conical elastic retaining ring, which frictionally engages with the slope of the synchronizer sleeve, is provided within each annular groove. When the transmission shifts gears, as the synchronizer sleeve reciprocates axially on the drive shaft, the slope friction between the synchronizer sleeve and the conical elastic retaining ring ensures that the synchronizer sleeve rotates at approximately the same speed as the first or reverse gear. This allows for smooth engagement between the synchronizer sleeve and the gear splines, resulting in smoother vehicle operation. Furthermore, it reduces the impact of meshing between the synchronizer sleeve and the gear splines during engagement, thus reducing abnormal noise and spline wear, and extending the transmission's lifespan. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of this application;

[0024] Figure 2 This is a schematic cross-sectional view of the structure according to an embodiment of this application;

[0025] Figure 3 This is a partial enlarged view of an embodiment of this application in an unattended state;

[0026] Figure 4 This is a partially enlarged view of the first gear in the synchronized state according to an embodiment of this application;

[0027] Figure 5 This is a partial enlarged view of the first gear in the engaged state according to an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of the first gear and the conical elastic retaining ring in Embodiment 1 of this application;

[0029] Figure 7 This is a cross-sectional view of the structure of the first gear and the conical elastic retaining ring in Embodiment 1 of this application;

[0030] Figure 8 This is a schematic diagram of the gear structure in Embodiment 1 of this application;

[0031] Figure 9 This is a schematic diagram of the conical elastic retaining ring according to an embodiment of this application;

[0032] Figure 10 This is a schematic diagram of the structure of the elastic positioning element in an embodiment of this application.

[0033] Figure label:

[0034] 1. Drive shaft; 1a. External spline teeth; 2. Needle roller bearing; 3. Reverse gear; 3a. Reverse gear engagement teeth; 4. Conical elastic retaining ring; 4a. Guide cone surface; 4b. Positioning protrusion; 4c. Retaining groove; 4d. First notch; 5. First gear; 5a. Annular groove; 5b. Axial limiting surface; 5c. Positioning groove; 5d. First gear engagement teeth; 6. Elastic positioning element; 6a. Second notch; 7. Synchronizer sleeve; 7a. Guide slope; 7b. Internal spline teeth. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] This application provides a simplified synchronization device for a gearbox, which can solve the problem of meshing impact between the synchronizer sleeve 7 and the first gear and reverse gear when the synchronizer sleeve 7 is splinedly engaged with the first gear and reverse gear in related technologies.

[0037] See Figure 1 , Figure 2and Figure 8 As shown, this application embodiment provides a simplified synchronization device for a gearbox, including:

[0038] The gear shifting system includes a drive shaft 1, a first gear 5 and a reverse gear 3 loosely fitted on the drive shaft 1, both of which are helical gears and freely rotate on the drive shaft 1. The first gear 5 and the reverse gear 3 are axially spaced on the drive shaft 1, and each of the adjacent sides of the first gear 5 and the reverse gear 3 has a radially formed annular groove 5a for accommodating a conical elastic retaining ring 4.

[0039] A simple synchronizer includes a synchronizer sleeve 7 that meshes with a drive shaft 1 and is located between a first gear 5 and a reverse gear 3. The synchronizer sleeve 7 can slide linearly back and forth on the drive shaft 1, thereby meshing with the first gear 5 and the reverse gear 3. A conical elastic retaining ring 4 is provided in the annular groove 5a of the first gear 5 and the reverse gear 3, which frictionally engages with the slope surface of the synchronizer sleeve 7. The conical elastic retaining ring 4 is circumferentially fixed within the annular groove 5a to restrict its rotation within the annular groove 5a.

[0040] The simplified synchronization device for the gearbox in this embodiment of the application has annular grooves 5a radially formed on the side adjacent to the first gear 5 and the reverse gear 3. A conical elastic retaining ring 4, which frictionally engages with the slope of the synchronizer sleeve 7, is provided within the annular grooves 5a. See also... Figure 3 As shown, when the shift gear system is in neutral, the conical elastic retaining ring 4 and the synchronizer sleeve 7 are in their initial state, that is, there is a gap between the synchronizer sleeve 7 and the conical elastic retaining ring 4, and they are not in contact with each other.

[0041] See Figure 4 As shown, when shifting gears in the transmission (first gear or reverse gear), the synchronizer sleeve 7 reciprocates axially on the drive shaft 1. The synchronizer sleeve 7 of the simple synchronizer moves towards the conical elastic retaining ring 4. The closer the synchronizer sleeve 7 is to the conical elastic retaining ring 4, the greater the frictional resistance between the synchronizer sleeve 7 and the conical elastic retaining ring 4. Under the mutual slope frictional contact between the synchronizer sleeve 7 and the conical elastic retaining ring 4, the speed of the synchronizer sleeve 7 and the first gear 5 or the reverse gear 3 are roughly the same.

[0042] See Figure 5 As shown, when the synchronizer sleeve 7 and the first gear 5 or the reverse gear 3 rotate at roughly the same speed, the synchronizer sleeve 7 continues to move towards the conical elastic retaining ring 4 to achieve smooth engagement between the synchronizer sleeve 7 and the first gear 5 or the reverse gear 3. This makes the car run more smoothly and reduces the meshing impact between the synchronizer sleeve 7 and the gear spline when they engage. This reduces abnormal noise and gear spline wear, and extends the life of the transmission.

[0043] In some alternative embodiments: see Figures 2 to 5 As shown in the figure, this application embodiment provides a simple synchronization device for a gearbox. The first gear 5 and the reverse gear 3 of this simple synchronization device each have an axially formed annular weight-reducing groove on their adjacent sides. An annular groove 5a is radially formed on the side wall of the annular weight-reducing groove away from the drive shaft 1. The outer diameter of the annular weight-reducing groove 5a is larger than the outer diameter of the synchronizer sleeve 7, so that part of the synchronizer sleeve 7 enters the annular weight-reducing groove to complete the pre-synchronization and meshing action between the synchronizer sleeve 7 and the first gear 5 or the reverse gear 3.

[0044] Both the first gear 5 and the reverse gear 3 are rotatably connected to the drive shaft 1 via needle roller bearings 2. The needle roller bearings 2 reduce the frictional resistance between the first gear 5 and the reverse gear 3 and the drive shaft 1, making their rotation on the drive shaft 1 smoother. An axial limiting surface 5b is formed by the bottom of the annular weight-reducing groove and the side of the synchronizer sleeve 7. When the side of the synchronizer sleeve 7 abuts against the bottom of the annular weight-reducing groove, it restricts further sliding. The synchronizer sleeve 7 then engages with either the first gear 5 or the reverse gear 3, thus completing the first gear or reverse gear engagement.

[0045] In some alternative embodiments: see Figures 2 to 5 As shown in the figure, this application embodiment provides a simple synchronization device for a gearbox. The outer ring of the synchronizer sleeve 7 of the simple synchronization device is provided with a guide slope 7a that frictionally engages with a conical elastic retaining ring 4. The side of the conical elastic retaining ring 4 near the synchronizer sleeve 7 is provided with a guide cone surface 4a that frictionally engages with the guide slope. The guide slope 7a of the synchronizer sleeve 7 and the guide cone surface 4a of the conical elastic retaining ring 4 squeeze and rub against each other, driving the first gear 5 or the reverse gear 3 to rotate, thereby making the rotational speed of the first gear 5 or the reverse gear 3 the same as the rotational speed of the synchronizer sleeve 7.

[0046] The guide slope 7a of the synchronizer sleeve 7 and the guide cone 4a of the conical elastic retainer 4 are not only used for pre-synchronization when they rub against each other, but also push the conical elastic retainer 4 to expand and deform under the guidance of the guide slope 7a and the guide cone 4a. This causes the expanded and deformed conical elastic retainer 4 to move into the annular groove 5a, so that the conical elastic retainer 4 avoids the synchronizer sleeve 7. Then, the synchronizer sleeve 7 continues to move towards the conical elastic retainer 4 and sets a position before meshing with the first gear 5 or the reverse gear 3 to complete the gear engagement action.

[0047] In some alternative embodiments: see Figure 6 and Figure 7As shown, this application embodiment provides a simple synchronization device for a gearbox, wherein the outer diameter of the annular groove 5a of the simple synchronization device is larger than the outer diameter of the conical elastic retaining ring 4. An elastic positioning member 6 is provided within the annular groove 5a for elastically supporting the conical elastic retaining ring 4 and the synchronizer sleeve 7, which are coaxially arranged. The elastic positioning member 6 surrounds the outer circumference of the conical elastic retaining ring 4 within the annular groove 5a to provide centering and positioning for the conical elastic retaining ring 4.

[0048] In this embodiment, the outer diameter of the annular groove 5a is larger than the outer diameter of the conical elastic retainer 4, so that the conical elastic retainer 4 has a certain deformation and expansion space within the annular groove 5a, thereby satisfying the function of the conical elastic retainer 4 avoiding the synchronizer sleeve 7. To improve the positional accuracy between the conical elastic retainer 4 and the synchronizer sleeve 7, and to make the axis of the conical elastic retainer 4 as collinear as possible with the axis of the synchronizer sleeve 7, an elastic positioning element 6 is provided within the annular groove 5a for elastically supporting the conical elastic retainer 4. The elastic positioning element 6 has a certain elastic support performance, which can well satisfy the centering and positioning function of the conical elastic retainer 4.

[0049] In some alternative embodiments: see Figures 6 to 9 As shown in the figure, this application embodiment provides a simple synchronization device for a gearbox. The tapered elastic retaining ring 4 of this simple synchronization device has a first notch 4d to give it a "C"-shaped structure. A positioning protrusion 4b is fixedly provided on the tapered elastic retaining ring 4. Positioning grooves 5c for accommodating the positioning protrusion 4b are axially formed on the adjacent sides of the first gear 5 and the reverse gear 3. Two retaining grooves 4c are symmetrically arranged along the first notch 4d on the outer wall of the tapered elastic retaining ring 4. The positioning protrusion 4b and the tapered elastic retaining ring 4 are integrally formed. Those skilled in the art can also replace the retaining grooves 4c on the outer wall of the tapered elastic retaining ring 4 with through holes for fitting retaining spring pliers.

[0050] The first gear 5 and the reverse gear 3 each have three positioning grooves 5c. Two of the positioning grooves 5c are used to expose the two slots 4c on the conical elastic retaining ring 4. The three positioning grooves 5c on the first gear 5 and the reverse gear 3 are all evenly distributed in a circle, which facilitates the quick engagement of the conical elastic retaining ring 4 with the first gear 5 and the reverse gear 3. When the positioning protrusion 4b of the conical elastic retaining ring 4 engages with any one of the positioning grooves 5c, the two slots 4c on the conical elastic retaining ring 4 are exposed in the other two positioning grooves 5c, which plays a role in preventing mistaken identity.

[0051] In this embodiment, a first notch 4d is provided on the conical elastic retaining ring 4, which enables the conical elastic retaining ring 4 to have good expansion and contraction capabilities. A positioning protrusion 4b is fixedly provided on the conical elastic retaining ring 4, which can cooperate with the positioning grooves 5c on the first gear 5 and the reverse gear 3 to restrict the axial rotation of the conical elastic retaining ring 4 within the positioning grooves 5c. Two retaining grooves 4c on the outer wall of the conical elastic retaining ring 4 facilitate the assembly and disassembly of the conical elastic retaining ring 4 using retainer pliers.

[0052] In some alternative embodiments: see Figures 1 to 7 and Figure 10 As shown, this application embodiment provides a simple synchronization device for a gearbox. The elastic positioning member 6 of the simple synchronization device is a regular polygonal elastic ring surrounding the outer periphery of the conical elastic retaining ring 4. The inner ring of the elastic positioning member is tangentially engaged with the outer ring of the conical elastic retaining ring 4 at multiple points. A second notch 6a is provided on the elastic positioning member 6 to avoid the positioning protrusion 4b, so that the elastic positioning member 6 has a "C" shaped structure.

[0053] In this embodiment, the elastic positioning element 6 is a regular polygonal elastic ring surrounding the outer periphery of the conical elastic retainer 4. The regular polygonal elastic ring not only provides elastic support for the conical elastic retainer 4, but also the radii of the multiple inner tangent points of the regular polygonal elastic ring and the outer ring of the conical elastic retainer 4 that are in contact with each other are equal to the radius of the center of the conical elastic retainer 4, thereby playing a good positioning role for the conical elastic retainer 4. Moreover, the elastic positioning element 6 made of the regular polygonal elastic ring has a simple structure, is easy to process and manufacture, and reduces production costs.

[0054] In some alternative embodiments: see Figures 1 to 2 As shown in the figure, this application embodiment provides a simple synchronization device for a gearbox. The inner circle of the synchronizer sleeve 7 of the simple synchronization device is provided with an inner spline tooth 7b that meshes with the drive shaft 1, and the outer wall of the drive shaft 1 is provided with an outer spline tooth 1a that meshes with the synchronizer sleeve 7. Under the guidance of the inner spline tooth 7b and the outer spline tooth 1a, the synchronizer sleeve 7 slides back and forth along the axial direction of the drive shaft 1, thereby realizing the meshing transmission with the first gear 5 and the reverse gear 3.

[0055] The first gear 5 has a first gear engagement tooth 5d fixedly provided on the side near the synchronizer sleeve 7, which meshes with the internal spline tooth 7b of the synchronizer sleeve 7. The reverse gear 3 has a reverse gear engagement tooth 3a fixedly provided on the side near the synchronizer sleeve 7, which meshes with the internal spline tooth 7b of the synchronizer sleeve 7. When the internal spline tooth 7b of the synchronizer sleeve 7 meshes with the first gear engagement tooth 5d of the first gear 5, the first gear is engaged; when the internal spline tooth 7b of the synchronizer sleeve 7 meshes with the reverse gear engagement tooth 3a of the reverse gear 3, the reverse gear is engaged.

[0056] Working principle

[0057] This application provides a simplified synchronization device for a gearbox. The simplified synchronization device includes a gear shifting system comprising a drive shaft 1, a first gear 5 and a reverse gear 3 loosely fitted on the drive shaft 1, the first gear 5 and the reverse gear 3 being axially spaced on the drive shaft 1, and an annular groove 5a radially formed on the adjacent side of the first gear 5 and the reverse gear 3; and a simplified synchronizer including a synchronizer sleeve 7 meshing on the drive shaft 1 and located between the first gear 5 and the reverse gear 3. A conical elastic retaining ring 4, which frictionally engages with the slope of the synchronizer sleeve 7, is provided within the annular groove 5a of the first gear 5 and the reverse gear 3. The conical elastic retaining ring 4 is circumferentially fixed within the annular groove 5a.

[0058] Therefore, the simplified synchronizer of this application has annular grooves 5a radially formed on the adjacent sides of the first gear 5 and the reverse gear 3. A conical elastic retaining ring 4, which engages with the sloping surface of the synchronizer sleeve 7, is provided within the annular groove 5a. When the transmission shifts gears, as the synchronizer sleeve 7 reciprocates axially on the drive shaft 1, the sloping surface friction between the synchronizer sleeve 7 and the conical elastic retaining ring 4 ensures that the synchronizer sleeve 7 rotates at approximately the same speed as the first gear 5 or the reverse gear 3. This allows the synchronizer sleeve 7 to smoothly mesh with the gear splines, resulting in smoother vehicle operation. Simultaneously, it reduces the impact of the synchronizer sleeve 7 engaging with the gear splines, thus reducing abnormal noise and gear spline wear, and extending the transmission's lifespan.

[0059] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0060] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A simplified synchronization device for a gearbox, characterized in that, include: The gear shifting system includes a drive shaft (1), a first gear (5) and a reverse gear (3) loosely fitted on the drive shaft (1), the first gear (5) and the reverse gear (3) being axially spaced on the drive shaft (1), and an annular groove (5a) being radially opened on the adjacent side of the first gear (5) and the reverse gear (3). A simple synchronizer, comprising a synchronizer sleeve (7) meshing on a drive shaft (1) and located between a first gear (5) and a reverse gear (3), wherein the annular groove (5a) of the first gear (5) and the reverse gear (3) are provided with a conical elastic retaining ring (4) that frictionally engages with the slope of the synchronizer sleeve (7), and the conical elastic retaining ring (4) is circumferentially fixed in the annular groove (5a); The first gear (5) and the reverse gear (3) are axially provided with annular weight reduction grooves on their adjacent sides. The annular groove (5a) is radially provided on the side wall of the annular weight reduction groove away from the transmission shaft (1). The outer diameter of the annular weight reduction groove is larger than the outer diameter of the synchronizer sleeve (7) so that part of the synchronizer sleeve (7) enters the annular weight reduction groove. The first gear (5) and the reverse gear (3) are rotatably connected to the transmission shaft (1) through the needle roller bearing (2). The bottom of the annular weight reduction groove cooperates with the side of the synchronizer sleeve (7) to form an axial limiting surface (5b). The outer ring of the synchronizer sleeve (7) is provided with a guide slope (7a) that frictionally engages with the conical elastic retaining ring (4), and the side of the conical elastic retaining ring (4) near the synchronizer sleeve (7) is provided with a guide cone (4a) that frictionally engages with the guide slope (7a).

2. The simplified synchronization device for a gearbox as described in claim 1, characterized in that: The outer diameter of the annular groove (5a) is larger than the outer diameter of the conical elastic retaining ring (4). The annular groove (5a) is provided with an elastic positioning member (6) for elastically supporting the conical elastic retaining ring (4) and the synchronizer sleeve (7) to be coaxially arranged. The elastic positioning member (6) surrounds the outer periphery of the conical elastic retaining ring (4) in the annular groove (5a).

3. A simplified synchronization device for a gearbox as described in claim 2, characterized in that: The conical elastic retaining ring (4) has a first notch (4d) to make the conical elastic retaining ring (4) have a "C" shaped structure. The conical elastic retaining ring (4) has a fixed positioning protrusion (4b). The first gear (5) and the reverse gear (3) have axially opened positioning grooves (5c) to accommodate the positioning protrusion (4b) on their adjacent sides. The outer wall of the conical elastic retaining ring (4) has two retaining grooves (4c) symmetrically arranged along the first notch (4d).

4. A simplified synchronization device for a gearbox as described in claim 3, characterized in that: The elastic positioning element (6) is a regular polygonal elastic ring surrounding the outer periphery of the conical elastic retaining ring (4). The inner ring of the elastic positioning element (6) is in multi-point internal tangential engagement with the outer ring of the conical elastic retaining ring (4). The elastic positioning element (6) has a second notch (6a) to avoid the positioning protrusion (4b), so that the elastic positioning element (6) has a "C" shaped structure.

5. A simplified synchronization device for a gearbox as described in claim 3, characterized in that: The first gear (5) and the reverse gear (3) are provided with three positioning grooves (5c), two of which expose two slots (4c) on the conical elastic retaining ring (4). The three positioning grooves (5c) on the first gear (5) and the reverse gear (3) are all arranged in a circumferentially evenly.

6. A simplified synchronization device for a gearbox as described in claim 1, characterized in that: The inner circle of the synchronizer sleeve (7) is provided with an inner spline tooth (7b) that meshes with the drive shaft (1), and the outer wall of the drive shaft (1) is provided with an outer spline tooth (1a) that meshes with the synchronizer sleeve (7). Under the guidance of the inner spline tooth (7b) and the outer spline tooth (1a), the synchronizer sleeve (7) slides back and forth along the axial direction of the drive shaft (1).

7. A simplified synchronization device for a gearbox as described in claim 6, characterized in that: The first gear (5) is fixedly provided with a first gear engagement tooth (5d) that meshes with the inner spline tooth (7b) of the synchronizer sleeve (7) on the side near the synchronizer sleeve (7), and the reverse gear (3) is fixedly provided with a reverse gear engagement tooth (3a) that meshes with the inner spline tooth (7b) of the synchronizer sleeve (7) on the side near the synchronizer sleeve (7).

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