Locking ring type synchronizer capable of achieving radial limiting through clamping spring and sliding block

Abstract

The utility model discloses a lock ring type synchronizer limited in the radial direction through a clamping spring and a sliding block. The lock ring type synchronizer comprises a gear hub, a sliding sleeve, an outer friction ring, the sliding block and the clamping spring. The sliding sleeve and the sliding block are both installed on the gear hub, the sliding block is attached to the sliding sleeve, a first groove is formed in the sliding sleeve inner spline, the clamping spring is arranged between the sliding block and the gear hub in a sleeved mode, the outer friction ring is installed on the gear hub, a second groove is formed in the outer friction ring, and the sliding block is matched with the second groove. On the premise that the basic structure of a traditional lock ring type synchronizer is maintained, the radial limiting mode is changed, the assembling process can be simplified, the production cost can be reduced, meanwhile, the gear engaging limiting reliability can be improved, the failure rate can be reduced, and the service life of the synchronizer can be prolonged. And meanwhile, the gear shifting force is reduced, and the gear engaging smoothness and comfort are improved.

Description

Technical Field

[0001] The utility model belongs to the field of synchronizers, in particular to a lock ring type synchronizer which is radially limited by a clamping spring and a sliding block. Background Art

[0002] The lock ring synchronizer is an important component in the traditional mechanical gearbox, which can ensure smooth and fast gear shifting. Most existing lock ring synchronizers use pins, encapsulated sliders, sliders, etc. to radially limit the sleeve through compression springs and pins, so that the synchronizer can work normally. This limiting method has the following disadvantages:

[0003] 1. The method of matching with compression spring takes a long time at the assembly site, is troublesome to assemble, and is prone to missing or wrong assembly;

[0004] 2. The compression spring is installed on the synchronizer with a certain preload and does not move during the synchronization process of the synchronizer, so it produces relative displacement with the mating parts, which in turn generates friction and affects the shifting feel;

[0005] 3. During the gear shifting process, the synchronizer is easily damaged and gear shifting cannot be achieved due to the unreliable axial limit of the pin. Once it comes out,

[0006] like Figure 2 As shown in FIG. 1 , a conventional lock ring synchronizer is shown, which includes a gear hub, a sliding sleeve, a combined gear ring, an inner friction ring, an intermediate ring, an outer friction ring, a pin 2.7 and a compression spring 2.8. During the assembly process, Figure 6 As shown, the compression spring 2.8 and the pin 2.7 need to be placed at the corresponding position of the gear hub first, and the compression spring 2.8 needs to be pre-tightened. Only in this way can the sleeve be smoothly installed in place. Special tooling is required in this process, and it takes a long time. Since the spring is small, it is hidden inside the synchronizer after assembly, which is not easy to check and inspect, and it is easy to be missed or wrongly installed.

[0007] In the traditional lock ring synchronizer, the compression spring 2.8 and the pin 2.7 are installed between the gear hub and the sleeve with a certain preload force, and do not move during the synchronization process of the synchronizer. Therefore, when the sleeve and other matching parts are relatively displaced, the pin 2.7 will produce a certain friction force on them, affecting the shifting feel. In addition, during the shifting process, the pin 2.7 and the compression spring 2.8 are not reliably limited in the axial direction of the synchronizer. Once they come out, it is easy to damage the synchronizer and make it impossible to shift. Summary of the invention

[0008] The utility model aims to solve the problems in the prior art and provide a lock ring type synchronizer with radial limiting by a retaining spring and a slider, so as to solve the problem that the traditional lock ring type synchronizer is not easy to assemble and is easy to be damaged during gear shifting.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A lock ring type synchronizer radially limited by a retaining spring and a slider comprises a gear hub, a sliding sleeve, an outer friction ring, a slider and a retaining spring;

[0011] The sliding sleeve and the slider are both installed on the gear hub, the slider fits with the sliding sleeve, a first groove is provided on the inner spline of the sliding sleeve, the retaining spring is arranged between the slider and the gear hub, the outer friction ring is installed on the gear hub, a second groove is provided on the outer friction ring, and the slider cooperates with the second groove.

[0012] Furthermore, a gap is left between the slider and the outer friction ring in the radial direction.

[0013] Furthermore, an inner friction ring is installed on the gear hub, a first circular hole is opened on the gear hub, and a first protrusion on the inner friction ring is inserted into the first circular hole.

[0014] Furthermore, friction material is provided on the conical surface of the inner friction ring.

[0015] Furthermore, an intermediate ring is provided between the outer friction ring and the inner friction ring.

[0016] Furthermore, the second protrusion on the intermediate ring is inserted into the second circular hole on the coupling gear ring.

[0017] Furthermore, the coupling gear ring is provided with a variable-section coupling tooth, and the variable-section coupling tooth is configured as a chamfered structure.

[0018] Furthermore, the sliding block is installed in a third groove provided on the gear hub.

[0019] Furthermore, the sliding sleeve is provided with sliding sleeve teeth, and the sliding sleeve teeth are meshed with splines on the coupling gear ring.

[0020] Furthermore, the outer friction ring is provided with tooth grooves.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model provides a locking ring type synchronizer with radial limiting by a retaining spring and a slider. The sleeve and the slider are both installed on the gear hub. A first groove is provided on the internal spline between the sleeve and the slider to limit the sleeve in a certain axial direction, so that the sleeve can move in the axial direction but will not fall out. The retaining spring is set between the slider and the gear hub to limit the axial moving area of ​​the slider. At the same time, the retaining spring and the slider play a role of radial limiting on the sleeve. The outer friction ring is installed on the gear hub. A second groove is provided on the outer friction ring so that the slider cooperates with the second groove. The circumferential movement of the slider can be limited by adjusting the structure of the outer friction ring. The locking ring type synchronizer of the utility model uses a retaining spring and a slider. During the working process of the synchronizer, the slider can move axially along the shifting direction, so the friction force on the sleeve is negligible, thereby reducing the shifting force, improving the shifting feel, and there is no risk of the pin coming out, thereby extending the service life of the synchronizer. At the same time, because the slider of the utility model will not be pushed outward by the compression spring like the pin of the traditional synchronizer, it is easy to assemble the sliding sleeve, thereby achieving the purpose of reducing the difficulty of processing and improving the reliability of limiting. The utility model changes the radial limiting method while maintaining the basic structure of the traditional lock ring synchronizer, which can not only simplify the assembly process and reduce production costs, but also improve the reliability of gear limiting, reduce the failure rate, and extend the service life of the synchronizer. At the same time, the shifting force is reduced, and the smoothness and comfort of gear shifting are improved. The utility model has no adverse effects on the installation dimensions of existing products and the production and processing of matching parts. It can be used in single-cone and multi-cone synchronizers, with strong adaptability and a wide range of applications.

[0023] Furthermore, the utility model simplifies the traditional six parts (three compression springs and three pins) into five parts (three slide blocks and two retaining springs), thereby reducing the difficulty of assembly and saving production costs.

[0024] Furthermore, the utility model limits the slider by adding a groove to the outer friction ring, and leaves a gap in the circumferential direction to prevent the outer friction ring from rotating and interfering with the slider during the synchronization process, which can improve the shifting reliability, avoid problems such as the pin falling out, and extend the service life of the synchronizer.

[0025] Furthermore, when the utility model is shifting gears, there is no relative displacement between the retaining spring and the sliding block, thereby reducing the shifting force and improving the shifting feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the lock ring type synchronizer of the utility model.

[0028] Figure 2 This is a schematic diagram of the overall structure of a traditional lock-ring synchronizer.

[0029] Figure 3 This is a cross-sectional view of the lock ring synchronizer of the utility model.

[0030] Figure 4 It is a schematic diagram of the outer friction ring groove of the utility model.

[0031] Figure 5 It is a schematic diagram of radial limiting of the retaining spring of the utility model.

[0032] Figure 6 This is a cross-sectional view of a traditional lock-ring synchronizer.

[0033] Among them: 1.1-gear hub, 1.2-sliding sleeve, 1.3-combined gear ring, 1.4-inner friction ring, 1.5-intermediate ring, 1.6-outer friction ring, 1.7-slider, 1.8-circlip, 1.2.1-first groove, 1.3.1-variable cross-section combined tooth, 2.7-pin, 2.8-compression spring;

[0034] Figure 4 a is the cross-sectional view of the outer friction ring groove, Figure 4 b is a three-dimensional schematic diagram of the outer friction ring groove. Figure 5 a is the radial limit section of the circlip. Figure 5 b is a three-dimensional schematic diagram of the radial limit of the retaining spring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] The utility model is further described in detail below with reference to the accompanying drawings:

[0042] See also Figure 1 The utility model provides a lock ring type synchronizer with radial limit by a retaining spring and a slider, comprising a gear hub 1.1, a sleeve 1.2, a combined gear ring 1.3, an inner friction ring 1.4, an intermediate ring 1.5, an outer friction ring 1.6, a slider 1.7 and a retaining spring 1.8. The sleeve 1.2 is installed on the gear hub 1.1, such as Figure 3 As shown, three sliders 1.7 are installed in the corresponding third grooves on the gear hub 1.1, and two retaining springs 1.8 are sleeved between the sliders 1.7 and the gear hub 1.1. Since the retaining springs 1.8 exert a radial force on the sliders 1.7, the sliders 1.7 are partially fitted with the sleeve 1.2. Figure 5As shown, the retaining springs 1.8 on both sides have an axial limiting effect on the slider 1.7, and the slider 1.7 is tightly fitted with the sleeve 1.2. The inner spline of the sleeve 1.2 is provided with a first groove 1.2.1. The slider 1.7 limits the sleeve 1.2 to a certain extent in the axial direction through the first groove 1.2.1, so that the sleeve 1.2 can move in the axial direction but will not fall out. Figure 4 As shown, the outer friction ring 1.6 is mounted on the gear hub 1.1, and a second groove is provided on the outer friction ring 1.6. The second groove is just matched with the combination of the gear hub 1.1 and the slider 1.7, and can limit the circumferential movement of the slider. Figure 3 As shown, the inner friction ring 1.4 is installed on the gear hub 1.1, and the three first protrusions on the inner friction ring 1.4 are inserted into the three first circular holes of the gear hub 1.1, so as to ensure the assembly position relationship between the inner friction ring 1.4 and the gear hub 1.1, and at the same time ensure the synchronous rotation of the two during the working process. An intermediate ring 1.5 is arranged between the outer friction ring 1.6 and the inner friction ring 1.4, and all the second protrusions of the intermediate ring 1.5 are inserted into the second circular holes of the combined gear ring 1.3, so as to ensure the assembly position relationship between the intermediate ring 1.5 and the combined gear ring 1.3, and at the same time ensure the synchronous rotation of the two during the working process.

[0043] Sliding sleeve 1.2 is provided with sliding sleeve teeth, and tooth grooves are provided on the outer friction ring 1.6. Sliding sleeve teeth can pass through the tooth grooves, and the sliding sleeve teeth mesh with the splines on the coupling gear ring 1.3. The coupling gear ring 1.3 is provided with variable cross-section coupling teeth 1.3.1. Since the sliding sleeve teeth of the sliding sleeve 1.2 and the spline end faces of the coupling gear ring 1.3 need to mesh with each other, in order to achieve fast gear shifting, the variable cross-section coupling teeth 1.3.1 are set as chamfered structures. The chamfered structures have a guiding function, which just corresponds to the teeth of the sliding sleeve 1.2, and are convenient for limiting.

[0044] like Figure 4 As shown, the second groove on the outer end face of the outer friction ring 1.6 is used for axial positioning of the slider 1.7. A certain gap is left between the slider 1.7 and the outer friction ring 1.6 in the radial direction to avoid interference between the outer friction ring 1.6 and the slider 1.7 when the synchronizer is synchronized. The inner friction ring 1.4 has friction materials such as carbon cloth and molybdenum spraying layer on the conical surface, which is used to cooperate with the conical surface on the intermediate ring 1.5 to play a synchronization role.

[0045] like Figure 3 As shown, when assembling the lock ring synchronizer of the utility model, it is only necessary to put the slider 1.7 into the corresponding position of the gear hub 1.1 and clamp the two sides of the gear hub 1.1 with the retaining spring 1.8 to limit the axial movement area of ​​the slider 1.7. At the same time, because the slider 1.7 of the utility model will not be pushed outward by the compression spring 2.8 like the pin 2.7 of the traditional synchronizer, it is easy to assemble the sliding sleeve 1.2.

[0046] The synchronization process of the lock ring type synchronizer of the utility model through radial limiting of the retaining spring and the slider is as follows:

[0047] like Figure 5 As shown, taking the movement of the sleeve 1.2 from the neutral position to the left as an example, under the action of the axial shift force, the sleeve 1.2 overcomes the force of the retaining spring 1.8 and moves to the left. The outer friction ring 1.4 moves to the left due to the axial force of the sleeve 1.2. This axial force squeezes the conical surface on the intermediate ring 1.5 and the conical surface of the inner friction ring 1.4, making the two close together. Because there is a speed difference between the two, the friction torque generated at the conical surface causes the inner friction ring 1.4 to rotate a quarter of a tooth, and the locking surface on the spline of the inner friction ring 1.4 and the locking surface on the spline of the sleeve 1.2 squeeze each other, causing the sleeve 1.2 to be unable to move further to the left until the pre-synchronization ends. Under the action of the friction force, the speeds of the inner friction ring 1.4 and the combined gear ring 1.3 tend to be consistent, and the friction torque disappears. At this time, the pre-synchronization is completed. Under the guidance of the axial shifting force and the spline locking surface, the sleeve 1.2 causes the outer friction ring 1.6 to rotate half a tooth along the rotation center, and the sleeve teeth on the sleeve 1.2 pass through the tooth grooves of the outer friction ring 1.6 and continue to move to the left, engaging with the splines on the coupling ring gear 1.3; finally, the sleeve 1.2 stops axial movement under the limiting action of the variable-section coupling teeth 1.3.1 on the coupling ring gear 1.3, and the gear is engaged, realizing the power route of power being transmitted from the coupling ring gear 1.3 to the sleeve 1.2, from the sleeve 1.2 to the gear hub 1.1, and then from the gear hub 1.1 to the main shaft.

[0048] The lock ring type synchronizer of the utility model uses a retaining spring 1.8 and a slider 1.7, which have very little friction on the sliding sleeve 1.2 during the operation of the synchronizer, thereby reducing the shifting force, improving the shifting feel, and eliminating the risk of the pin coming out, thereby extending the service life of the synchronizer.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lock ring type synchronizer with radial limiting by means of a retaining spring and a sliding block, characterized by comprising a gear hub (1.1), a sliding sleeve (1.2), an outer friction ring (1.6), a sliding block (1.7) and a retaining spring (1.8); The sliding sleeve (1.2) and the sliding block (1.7) are both mounted on the gear hub ( The sliding block (1.7) is fitted on a sliding sleeve (1.2), a first groove (1.2.1) is provided on an inner spline of the sliding sleeve (1.2), the retaining ring (1.8) is sleeved between the sliding block (1.7) and the gear hub (1.1), the outer friction ring (1.6) is mounted on the gear hub (1.1), a second groove is provided on the outer friction ring (1.6), and the sliding block (1.7) is fitted with the second groove.

2. A lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 1, characterized in that: A gap is left between the slider (1.7) and the outer friction ring (1.6) in the radial direction.

3. The lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 1, characterized in that: An inner friction ring (1.4) is mounted on the gear hub (1.1), a first circular hole is opened on the gear hub (1.1), and a first protrusion on the inner friction ring (1.4) is inserted into the first circular hole.

4. A lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 3, characterized in that: Friction material is provided on the conical surface of the inner friction ring (1.4).

5. The lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 1, characterized in that: An intermediate ring (1.5) is arranged between the outer friction ring (1.6) and the inner friction ring (1.4).

6. A lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 5, characterized in that: The second protrusion on the intermediate ring (1.5) is inserted into the second circular hole on the coupling gear ring (1.3).

7. A lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 6, characterized in that: The coupling gear ring (1.3) is provided with a variable-section coupling tooth (1.3.1), and the variable-section coupling tooth (1.3.1) is configured as a chamfered structure.

8. The lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 1, characterized in that: The sliding block (1.7) is installed in a third groove opened on the gear hub (1.1).

9. The lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 1, characterized in that: The sliding sleeve (1.2) is provided with sliding sleeve teeth, and the sliding sleeve teeth are meshed with splines on the combined gear ring (1.3).

10. The lock ring type synchronizer with radial limitation by a retaining spring and a slider according to claim 1, characterized in that: The outer friction ring (1.6) is provided with tooth grooves.

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