WO2016165709A1

WO2016165709A1 - Synchronizing ring of a synchronizing device, and synchronizing device

Info

Publication number: WO2016165709A1
Application number: PCT/DE2016/200183
Authority: WO
Inventors: Viktor Lichtenwald
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2015-04-13
Filing date: 2016-04-13
Publication date: 2016-10-20
Also published as: DE102016206186B4; WO2016165707A1; CN107466342A; DE102016206189A1; CN107466342B; DE102016206186A1; DE102016206190A1; JP2018511752A; WO2016165710A1; DE102016206187A1; WO2016165711A1

Abstract

The invention relates to a synchronizing ring (4) of a synchronizing device (1), comprising a cone body (45), a locking toothing (43) and an anti-rotation means, wherein the anti-rotation means is formed by a tooth gap (46) of the locking toothing (43). The invention also relates to a synchronizing device (1) comprising such a synchronizing ring (4).

Description

Description of the Invention Synchronizer ring of a synchronizer and synchronizer

description

The invention relates to a synchronizer ring for a synchronizing device of a motor vehicle transmission with a cone body, a locking toothing and an anti-rotation device.

BACKGROUND OF THE INVENTION DE 198 53 856 A1 shows a synchronizing ring made of sheet metal in the forming process with a substantially conical annular body. At the edge of the synchronizer ring with the large cone diameter a radially outwardly facing and circumferentially extending teeth is formed. At the edge with the small cone diameter are radially outwardly of the axis of rotation of the synchronizer ring pioneering stops or drivers out. These drivers are provided, for example, for a positive engagement in a coupling body such as a sleeve carrier. The stops are integrally formed with the synchronizer ring and radially outwardly shaped.

The connection of the synchronizer ring with the sleeve carrier can be done either directly or indirectly. As a rule, there is a direct connection through the drivers, which are arranged on the synchronizer ring. The drivers are often designed in the form of lobes. Theoretically, the width of a synchronous ring arrangement is determined only by the width of the friction surfaces required for the friction power. Practically, however, the space required for the elements for positive connection of the rings with their Anschlusskonstruk- tion, such as the drivers mentioned above. The axial extent of a synchronizer is substantially affected by the design and orientation of such drivers formed as lobes. If a flap is arranged on the cone side with the smaller diameter, so positive connections with the sleeve carrier in such synchronizer rings only with greater effort, eg. B. long trained rag be realized. The longer a rag is, the harder it is to align it precisely in its position and position. The production cost and thus the manufacturing costs are, for. B. by additional calibration, increased. However, if this step is omitted, such a device is not completely silent, but produces a so-called Synchronringschwirren. If the drivers in their associated recesses have a game, so rotational irregularities of the internal combustion engine, which are transmitted to the transmission, here lead to acceleration peaks and cause buzzing. The Synchronringschwirren is increasingly perceived by the driver as annoying, since the overall noise level in modern vehicles goes back. Object of the invention

The invention is therefore based on the object to provide a synchronizing device in which the above-mentioned disadvantages are eliminated and to propose a synchronizer ring that is easy to manufacture gen.

This object is achieved by the subject matter of claim 1. Characterized in that the anti-rotation means is formed by a Sperrverzahnungslücke in the ratchet teeth, no more drivers are required, which must be formed on the synchronizer ring or formed with this. Due to the spatial proximity to the ring structure, the synchronizer ring can also reliably absorb high, sudden force peaks.

The structure of the synchronizer ring according to the invention is simplified. In one embodiment, the synchronizer ring has an L-shape in each longitudinal step. In particular, so that no radially projecting from the cone body driver or cloth are provided. Thus, the inner diameter and the outer diameter at the tapered end of the synchronizer ring (4) in each angular direction are equal.

Also axially directed driver, which would be at least in the longitudinal section in which the driver would be visible, are excluded.

In one embodiment of the synchronizer ring this has plane, circular end faces. The locking toothing is preferably provided as an external toothing on the end face with the larger diameter.

Preferably, the synchronizer ring has a plurality of locking teeth gaps in order to minimize the load on the axial projections of the sleeve carrier engaging in the locking teeth gaps. The Sperrverzahnungslücken correspond in their extension in the circumferential direction preferably at least five teeth. For example, a four-tooth-wide axial projection engages in a six-tooth-wide Sperrverzah- gap. In their radial height, the locking tooth gaps preferably correspond to the tooth base of the external toothing. Depending on the height of the engaging axial projections, the radial height of the locking tooth gap may also be slightly above or below the tooth base. The Sperrverzahnungslücken correspond in their extent in the axial direction. The production of the tooth gaps does not require a separate Positioning step, so that the anti-rotation means on the synchronizer ring is low and integrally produced.

In one embodiment, between each two locking tooth gaps widened teeth are preferably arranged centrally and spaced as far as possible. The widened teeth form a stop for a Vorsynchronisationselement as a flat pressure piece described below. Preferably, the sleeve carrier has exactly three widened teeth and exactly three locking teeth gaps.

The pressure piece has a housing and a molded spring produced separately from the housing. The housing has a bottom whose axial length is greater than that of the spring, and side walls which at least partially surround the spring, and a lid portion, wherein the spring is at least partially disposed radially between the lid portion and the bottom. The lid portion is axially spaced from the sidewalls by clearances, and the spring extends into the clearances and projects radially beyond the lid portion without external force on the pad.

The fact that the spring is not designed as a simple helical compression spring, but as a form spring whose legs protrude partially radially over the lid is a particularly flat design of the pressure piece possible. The radial height of the pressure piece in the region of the cover portion may thus be of the same order of magnitude or even less than the spring deflection by which the spring is compressed. This in turn makes it possible to make the recess for the pressure piece between the sleeve carrier and the sliding sleeve so small that the carrying capacity of the sleeve carrier is not or hardly affected. In one embodiment of the invention, the pressure piece thus enables a synchronizing device with a Sleeve carrier in which the pressure piece receiving does not reach deeper than the base band of the toothing.

The height of the pressure piece can be further reduced if the pressure piece with the two sheets can be locked against a sliding sleeve whose teeth are flattened to the end faces. In the neutral position, the two arches of the spring thus take a sliding sleeve tooth axially between them and are biased together against this. The spring as a latching element protrudes radially to a circular path, on which rotates the pressure piece entrained by the rotating unit of sliding sleeve and sleeve carrier about the axis of rotation of the unit. The pressure piece is resiliently biased against the sliding sleeve and locked at least temporarily in a detent recess opposite the pressure piece on the sliding sleeve.

The housing is preferably a sheet metal part and cupped. In this case, the housing has a bottom. From the bottom preferably go from two angled in the radial direction side walls. Depending on the design of the pressure piece, the housing remains open in a radial direction or is partially covered on its side opposite the bottom. To cover the housing is either a one-piece with the housing formed and preferably angled from one of the side walls or a separate, preferably also formed from sheet metal and provided on the or in the housing lid provided.

The latching element is a separately manufactured to the housing item and is inserted into the housing. As a result, the latching element, with the exception of the protruding from the housing and resiliently biased against the sliding sleeve portion of the locking element is well protected by the housing against mechanical influences. At least one, preferably both, in the Course direction of the axis of rotation directed sides of the housing are provided for the start of the pressure piece to each one to be activated by the pressure piece synchronizer ring. The pressure piece according to the invention requires little radial space. It may even be sufficient to create enough space for receiving the pressure piece by omitting one or more circumferentially adjacent teeth of the teeth of the sliding sleeve and / or the sleeve carrier. The pressure piece is inserted into the resulting gap. As a rule, three or more of the pressure pieces are distributed around the circumference of the unit. The sleeve carrier or the sliding sleeve need not be weakened by a groove radial depth for receiving the compression spring.

Brief description of the drawings

The invention will be explained in more detail with reference to several embodiments. Show it:

1 shows a synchronizing device in an embodiment according to the invention in a perspective oblique view,

FIG. 2 shows the synchronizing device according to FIG. 1 in a partially sectioned plan view,

FIG. 3 shows the synchronizing device according to FIG. 1 in a partially sectioned oblique view;

Figure 4 shows the synchronizing device of Figure 1 in one

Longitudinal section FIG. 5 shows a part of the synchronizing device according to FIG. 4 in an enlarged view,

6 shows the pressure piece of the synchronizing device according to the figures 1 to 5 in a perspective

Tilt,

7 shows the pressure piece according to FIG. 6 in longitudinal section, FIG. 8 shows the sleeve carrier of the synchronizing device according to FIGS. 1 to 5 in a perspective oblique view,

FIG. 9 shows one of the outer synchronizing rings of FIG

Synchronizing device according to Figures 1 to 5 in a perspective oblique view.

DETAILED DESCRIPTION OF THE DRAWINGS FIGS. 1 to 5 show a synchronizing device 1 which has a sliding sleeve 2, a sleeve carrier 3, a plurality of synchronizing rings 4, 5, gear wheels 6, coupling bodies 7 and thrust pieces 8.

The sleeve carrier 3 sits on a gear shaft, not shown, and engages with a spline 3c or the like in a corresponding counter-profile on the transmission shaft. The sliding sleeve 2 has an internal toothing 21 with which the sliding sleeve 2 engages in a corresponding counter-toothing 31 on the sleeve carrier 3. The sliding sleeve 2 is arranged longitudinally displaceable on the sleeve carrier 3. About the interlocking profiles 33 and the teeth 21, 31, the sliding sleeve 2, the sleeve carrier 3 and the gear shaft rotationally mit- connected to each other, so that the transmission shaft, the sleeve carrier 3 and the sliding sleeve 2 together and in the circumferential direction relative to each other immovable rotate about a common axis of rotation. On both sides of the sleeve carrier 3, the synchronizer rings 4, 5 are arranged, of which the outer synchronizer rings 4 are secured against rotation by the sleeve carrier and therefore rotate synchronously with the transmission shaft about the axis of rotation. Each of the inner synchronizer rings 5 is rotationally connected to one of the coupling bodies 7, which are in turn rotationally coupled to one of the gear wheels 8. The coupling body 7 each have coupling teeth 7a for engaging the internal teeth 21. The gear wheels 8 are freely rotatably mounted on the transmission shaft about the axis of rotation to the transmission shaft, so that the gear wheel 8, the coupling body 7 and the inner synchronizer ring 5 are rotatable relative to the transmission shaft together with non-shifted gear.

The plungers 8 sit radially and circumferentially distributed between the sleeve carrier 3 and the sliding sleeve 2. From Figure 2, a sectional view of Figure 1 in the plan view, and from Figure 8 it can be seen that by missing or modified teeth 22, 32nd the internal teeth 21 and the external teeth 31 are provided for each of the pressure pieces 8 gaps 10 for receiving the pressure pieces 8. The internal teeth 21 and the external teeth have tooth spaces 24, 34, which are arranged in the circumferential direction at the same angular positions and together form the gaps 10. Not shown are variants in which the gaps 10 is formed only by partially overlapping tooth spaces 24, 34 or by a tooth gap only in one of the teeth 21, 31.

The plungers of Figures 1 to 5 are shown enlarged in Figures 6 and 7. The pressure piece 8 has a housing 81 which is formed of sheet metal and provided with a flat bottom 82 and side walls 83. The End walls 83 are angled in the direction of the sliding sleeve 2 of the bottom 82. The aligned perpendicular to the axis of rotation end walls 83 have a plane surface for the contact of the pressure member 8 with the outer synchronizer ring 4. The pressure piece 8 also has side walls 87, of which cover portions 84 are angled, which at least partially cover the pressure piece 8 on its side 82 opposite the bottom. They are formed in the plan as mutually parallel strips, which are spaced from each other by a parallel gap 85. Housed in the housing 81 is a bow-shaped spring 9, which is at least partially encapsulated by the side walls 87 and the lid sections 84 and the bottom 82. The spring 9 has two legs 92, wherein the legs 92 are directed to the center of the pressure piece, so that the spring ends 91 are both supported on the bottom 82. From each other, the spring ends 91 are spaced by a small gap 93 relative to the leg length. Thus, the spring 9 can be supported well on the ground 81, the spring ends are rounded.

Each of the legs 92 has a curvature in the form of a bow 94, wherein the two arches 94 are connected by a parallel to the bottom 82 extending spring portion 95. The arches 94 protrude radially from the imaginary cuboid formed by the housing 81 and each form loop-like locking elements 96. The locking elements 96 are spaced apart so that they take a sliding sleeve tooth between see themselves in the mounted state and can be supported on this. In the neutral position of the spring portion 95 is located on the lid portions 84 on the inside.

In its neutral position according to Figures 2 and 3, the sliding sleeve 2 is between the two non-connected gear wheels 6. As can be seen from Figure 8, the pressure piece 8 is located in a tooth gap 34 of the sleeve carrier 3, whose width in the circumferential direction of the width of the pressure piece 8 corresponds. Everyone the arcs 94 of the locking elements 96 is engaged in one of the locking recesses 25 formed by chamfers on the teeth of the sliding sleeve 2. During a movement of the sliding sleeve 2 longitudinally in one of the directions of rotation axis for switching one of the gear wheels 6, the sliding sleeve 2 takes the pressure piece 8 on the latched in the locking recesses 25 locking elements 96 initially along. The pressure piece 8 strikes with its the gear wheel 6 to be switched facing end wall 83 on a stop 41 on the outer synchronizer ring 4. The pressure piece 8 pushes the outer synchronizer ring 4 with its inner conical friction surface 42 along the axis of rotation on the outer conical friction surface 52 of the other synchronizer ring 5. As a result, the synchronization process is initiated in the synchronizing device 1. The sliding sleeve 2 continues to move in the direction of the coupling body 7 until the internal toothing 21 meshes with the coupling toothing 71 and the gear wheel 6 is thus connected in a rotationally fixed manner to the unit consisting of the sliding sleeve 2 and the sleeve carrier 3.

While the pressure piece 8 is initially taken away by the sliding sleeve 2, it is finally stopped by the outer synchronizing ring 4 running on the further synchronizing ring 5 on the stop 41 in its movement along the axis of rotation. The locking elements 96 are forced by the further moving sliding sleeve 2 and against the bias of the spring 9 to dodge in the direction of the pressure piece 8 and to dodge in the pressure piece 8 and the arcs 94 snap out of the locking recesses 15. The region of the arches 94 springs into the free space 86 formed by the housing 81 and the legs 92. Due to the encapsulation of the spring 9, this is protected in the loaded state. The locking elements 96 with the sheets 94 are further biased against the longitudinally relative to the pressure piece 8 moving sliding sleeve 2. In a switching movement of the sliding sleeve 2 longitudinally in the position of Figure 2, 3 back the legs 92 spring back on when the locking recesses 25 meet the sheets 94. The locking elements 14 then engage in the locking recesses 15 again. FIG. 8 shows the sleeve carrier 3 in a perspective view. The sleeve carrier 3 has radially seen from the inside to the outside a hub 1 1, a base body 13 and a jacket 12 and is made in one piece. The hub 1 1 has a hub toothing 38 as internal toothing, with which the sleeve carrier 3 can be rotatably connected to a transmission shaft. The sleeve carrier 3 is made for example as a sintered, forged or sheet metal component. In the present case, the sleeve carrier 3 is formed axially symmetrical to its central division plane. The main body 13 is formed rotationally symmetrical and free of carriers or Indexieraufnahmen or otherwise with a synchronizer ring in the direction of rotation limiting means. The hub 1 1 and the main body 13 have annular end faces 35. The jacket 12 has a circumferential outer toothing 31, which is interrupted only by three tooth gaps 34 in which the pressure pieces 8 are arranged in the synchronizing device. The circumferentially adjacent skirt portion 37 of the external toothing 31 has the same axial width as the tooth gap, so that a radial backing is formed for the pressure piece. Furthermore, the sleeve carrier 3 axial projections 36 which are spaced from the tooth gaps 34 in the circumferential direction. The axial projections are provided over their entire length with teeth 32 and form an anti-rotation device for an axially adjacent synchronizer ring 4. FIG. 9 shows the synchronizer ring 4 of the synchronizer device 1. The synchronizer ring 4 has a cone body 45, at whose axial end with the larger diameter a locking toothing 43 is arranged. The locking teeth 43 is directed radially and has teeth 49 with roof teeth. The locking toothing 43 is interrupted by three locking tooth gaps 46, the locking tooth gaps 43 lying in their radial height below the tooth root of the locking toothing 46. The width in the circumferential direction corresponds to the width of the axial projections 36 of the associated sleeve carrier 3 plus the game required for catching and rewinding during synchronization. The indexing of the synchronizer ring 4 takes place via the locking tooth gaps 46.

The synchronizer ring 4 also has widened teeth 48, which are arranged centrally between the locking teeth gaps 46. The widened teeth 48 serve as a stop surface for the pressure piece 8, via which the Vorsynchronisation can be initiated.

reference numeral

I synchronizing device

2 sliding sleeve

3 sleeve carrier

4 synchronizing ring

5 synchronizer ring

6 gear wheel

7 coupling body

8 pressure piece

9 spring

10 gap

I'm a hub

12 coat

13 basic body

21 internal toothing

22 tooth

23 tooth

24 tooth gap

25 detent recess

31 external toothing

32 tooth

33 tooth

34 tooth gap

35 face

36 axial projection

37 adjoining jacket section

38 hub teeth 41 stop

42 friction surface

43 locking teeth 44 face

45 cone body

46 locking gear gap

47 tooth base

48 widened teeth

52 friction surface

71 Clutch toothing 81 Housing

82 ground

83 front wall

84 cover section

85 parallel gap

86 free space

87 side wall

91 spring end

92 thighs

93 gap

94 sheets

95 spring section

96 locking element

Claims

claims

1 . Synchronizer ring (4) of a synchronizing device (1) with a cone body (45), a locking toothing (43) and an anti-rotation means, characterized in that the anti-rotation means by a tooth gap (46) of the locking toothing (43) is formed.

2. synchronizer ring according to claim 1, characterized in that the synchronizer ring (4) has an L-shape in each longitudinal section.

3. synchronizer ring according to claim 1 or 2, characterized in that the synchronizing ring plane, circular end faces (44).

4. Synchronizer ring according to one of the preceding claims, character- ized in that the locking toothing (43) is formed as an external toothing on the radially larger end face (44) of the cone body (45).

5. Synchronizer ring according to one of the preceding claims, characterized in that the locking toothing (43) has a plurality of Sperrverzahnungslü- bridge (46).

6. synchronizer ring according to any one of the preceding claims, characterized in that the Sperrverzahnungslücke (46) is formed as a cylinder jacket surface portion which is set back radially to the tooth base (47) of the teeth of the ratchet teeth (43).

7. Synchronizer ring according to one of the preceding claims, characterized in that the locking toothing (43) has individual, widened teeth (48).

8. Synchronizing device (1) with a sliding sleeve (2), which has an internal toothing (21), with a sleeve carrier (3) having an external toothing (31) for meshing with the internal toothing (21) of the sliding sleeve (2), and with a synchronizer ring (4) according to one of the preceding claims, wherein the external toothing (31) has an axial projection (36) which engages in the locking tooth gap (46).

9. Synchronizing device according to claim 8, characterized in that the locking toothing (43) has individual, widened teeth (48) and a pressure piece (8) is arranged on the sleeve carrier, via which the widened teeth (48) can be acted upon.