CN107636336B

CN107636336B - Synchronizing body

Info

Publication number: CN107636336B
Application number: CN201680024633.3A
Authority: CN
Inventors: 塞巴斯蒂安·吉尔; 拉尔夫·申普夫
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2015-06-11
Filing date: 2016-06-08
Publication date: 2020-02-14
Anticipated expiration: 2036-06-08
Also published as: CN107636336A; WO2016198071A1; DE102015210686A1

Abstract

A synchronizing body (1) for a synchronizing device of a gear transmission has a ring part (2) with external toothing (3) and an inner ring (5) with an opening (4) for a transmission shaft, which ring part and inner ring are coupled to one another via an overrunning clutch which is designed as a wedge-disk one-way clutch.

Description

Synchronizing body

Technical Field

The invention relates to a synchronizing body for a synchronizing device of a gear transmission, comprising a ring part having external toothing and an inner ring having an opening for a transmission shaft, the ring part and the inner ring being coupled to one another via an overrunning clutch.

Background

Such a synchronization body is known from DE 112009005205T 5. The synchronizing body is a component of a synchronizing device which is incorporated into a manual transmission in order to shift gears between the individual gears in a comfortable manner. During a gear change, the circumferential speed of the gear wheel is matched to the circumferential speed of the transmission shaft by means of different elements of the synchronization device, and a positive connection between the gear wheel and the transmission shaft is then established. The transmission shaft and the sliding sleeve are connected to one another in a rotationally fixed manner by a synchronizing body of the synchronizing device. This is typically done as follows: on the one hand, the contour formed on the inner circumference of the synchronizing body is connected as an internal toothing to the transmission shaft, and on the other hand the sliding sleeve is displaceable along the longitudinal center axis of the transmission shaft on an external toothing provided on the outer circumference of the synchronizing body. The synchronizing body can also serve as a stop and/or guide element for the synchronizing ring or friction ring.

From the documents mentioned at the outset, synchronization bodies with overrunning clutches, which are referred to as one-way clutches, are known. The drive engine can be decoupled from the drive train in freewheeling by means of the one-way clutch. In freewheeling, i.e. when the engine is not outputting power, the engine is driven via the driveline by the inertia of the vehicle. However, since the synchronizing body can only transmit torque in one rotational direction, the drive train can be interrupted by the one-way clutch, so that the braking torque generated by the engine is not transmitted to the drive train during freewheeling. In the freewheeling, the overrunning clutch (one-way clutch) is disengaged due to the difference in rotational speed. Thus, reducing the kinetic energy of the vehicle by the braking torque transmitted by the engine in the conventional manner is not performed.

Of course, the power density of conventional overrunning clutches is limited. In order to transmit large torques, an overrunning clutch having a relatively large installation space is therefore required.

Disclosure of Invention

The invention is therefore based on the object of: a synchronization body is proposed, in which the ratio of the transferable power to the required installation space is improved.

In order to achieve the object, according to the invention, in a synchronization body of the type mentioned at the outset, it is proposed that: the overrunning clutch is formed as a wedge disk one-way clutch.

Wedge disk one-way clutches have a significantly higher power density than conventional one-way clutches, which are usually designed, for example, as roller one-way clutches or as clamping body one-way clutches. Thereby, the following advantages are obtained: the synchronizer body according to the invention with the overrunning clutch can replace conventional synchronizer bodies, which have hitherto been usually designed without a one-way clutch, without increasing the installation space. The synchronization body according to the invention can therefore be integrated into a conventional transmission without major structural changes.

Preferred within the scope of the invention are: the wedge disk one-way clutch has two wedge disks which are arranged axially next to one another, are arranged radially inwardly on the ramp-shaped contour of the inner ring and are inserted radially outwardly into the groove of the ring part. Preferably, the wedge disk one-way clutch comprises an inner ring with a ramp-shaped profile, whereby a force component is formed in operation which presses the wedge disk or the elements of the wedge disk radially outwards. Thereby, the wedge discs or the elements of the wedge discs are supported on the contact faces of the ring parts, in particular on the grooves. As a result, a friction force is formed, by means of which torque can be transmitted.

Advantageously, in the synchronizing body according to the invention, the bearing ring can be connected with the inner ring or the ring part in a force-fitting or form-fitting manner. The contact joint is fixed and the other joint acts as a plain bearing. Thus, either a relative movement between the ring member and the bearing ring or a relative movement between the bearing ring and the inner ring is achieved.

As regards the bearing ring, in the synchronizing body according to the invention it is preferred that: the bearing ring is made of steel or of a plain bearing material, such as brass or bronze, or of a plain bearing composite material. Alternatively, the bearing ring can have a coating.

An alternative embodiment of the synchronization body according to the invention provides that: the ring part is mounted on the inner part by means of a rolling bearing. In this variant, therefore, a rolling bearing is used instead of a bearing ring.

Within the scope of the invention it can also be provided: the synchronizing body has one or more holes and/or grooves and/or perforations for conveying the lubricating material to the bearing points. Preferably, the bore is formed in the axial direction. Lubricating oil or grease can be used as the lubricating material.

Drawings

The invention is elucidated below on the basis of embodiments with reference to the drawing. The figures are schematic and show:

FIG. 1 shows a perspective, partially cut-away view of one embodiment of a synchronizing body according to the invention;

FIG. 2 shows an exploded view of the synchronization body of FIG. 1;

FIG. 3 shows a side view of the synchronization body according to the invention shown in FIG. 1; and

fig. 4 shows a cross-sectional view of the synchronizing body along the line IV-IV.

Detailed Description

The synchronizer 1 shown in fig. 1 to 4 is designed as a synchronizer for a gear transmission. The synchronizing body 1 comprises a basic body, which is designed as a ring part 2 and has external toothing 3. The ring part 2 has an opening 4 into which an inner ring 5 is fitted in the mounted state. The inner ring 5 itself has an opening 6, which makes it possible to mount the inner ring 5 on the transmission shaft in a rotationally fixed manner. The ring members 2 and the inner ring 5 are coupled to each other via an overrunning clutch, which is configured as a wedge disc one-way clutch. For this purpose, the inner ring 5 has on its outer side a ramp-shaped profile 7 on which two wedge disks 8, 9 are arranged axially next to one another. In fig. 1 can be seen: the wedge discs 8, 9 engage on the outside in encircling grooves 10 on the inside of the ring part 2. The two wedge disks 8, 9 act like the clamping bodies of a conventional one-way clutch.

In fig. 2 can be seen: the wedge disks 8, 9 have radially inner and radially outer recesses, and the wedge disks 8, 9 are, for example, designed as open rings as shown in this exemplary embodiment. The ramp-shaped profile 7 is similar to a conventional one-way clutch in that: rotation between the annular member 2 and the inner ring 5 in only one direction of rotation is possible. In this state, the wedge disk one-way clutch is disengaged. On the other hand, the ramp-shaped profile 7 together with the wedge-shaped disks 8, 9 give rise to: the wedge disc one-way clutch is closed with opposite rotational directions so that torque is transmitted between the inner ring 5 and the ring member 2.

The synchronizing body 1 is lubricated by means of lubricating oil, which is delivered through axial bores (not shown) in the ring parts 2.

Axially next to the wedge discs 8, 9,

support rings

11, 12 are provided, which in the illustrated embodiment are manufactured from a plain bearing material, for example brass. In addition, other materials can be considered, and in the simplest case the bearing ring can be made of steel.

Support rings

11, 12 support the ring member 2 on the inner ring 5. As already explained, alternative embodiments are also possible in which the ring part 2 and the inner ring 5 are mounted by rolling bearings.

The synchronization bodies shown in fig. 1 to 4 are characterized by a high ratio of transferable power to the required installation space. Since the wedge disk one-way clutch requires only a small installation space, the conventional synchronizing body can be replaced by the synchronizing body described in the present application.

List of reference numerals

1 synchronization body

2 Ring component

3 external tooth part

4 opening

5 inner ring

6 opening

7 profile

8 wedge-shaped disc

9 wedge-shaped disc

10 groove

11 supporting ring

12 support ring

Claims

1. Synchronizing body (1) for a synchronizing device of a gear transmission, with a ring part (2) with external toothing (3) and an inner ring (5) with an opening (4) for a transmission shaft, which ring part and inner ring are coupled to each other via an overrunning clutch, characterized in that the overrunning clutch is designed as a wedge disk one-way clutch, a bearing ring being connected with a force-fit or form-fit with the inner ring (5) or the ring part (2) in order to radially support the ring part on the inner ring.

2. The synchronization body as claimed in claim 1, characterized in that the wedge disk one-way clutch has two wedge disks (8, 9) arranged axially alongside one another, which are arranged radially inwardly on the ramp-shaped profile (7) of the inner ring (5) and are fitted radially outwardly into the groove (10) of the ring part (2).

3. Synchronization body according to claim 1, characterized in that the bearing rings (11, 12) are manufactured from steel or from a plain bearing material, such as brass or bronze, or from a plain bearing composite material, or have a coating.

4. Synchronization body according to claim 1 or 2, characterized in that the support ring is a rolling bearing by means of which the ring part (2) is supported on the inner ring (5).

5. Synchronizing body according to claim 1 or 2, characterized in that the synchronizing body has one or more holes for feeding lubricating material to the bearing points.