Synchronizer having asymmetric blocker and sleeve teeth

Patent metadata

Field	Value
Publication number	US-9777779-B2
Application number	US-201615012434-A
Country	US
Kind code	B2
Filing date	Feb 1, 2016
Priority date	Mar 17, 2015
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A synchronizer for a transmission of a motor vehicle is provided. The synchronizer includes a sleeve and a blocker ring. The sleeve includes sleeve spline teeth and advanced sleeve spline teeth. The blocker ring includes blocker spline teeth. The sleeve spline teeth and blocker spline teeth are each asymmetrical and have a blunt tip, a first angled side, and a second angled side. The first and second angled sides have different angular relationships to a longitudinal axis of the teeth.

First claim

The following is claimed:

1. A synchronizer for a transmission of a motor vehicle, the synchronizer comprising:
a sleeve having sleeve spline teeth and advanced sleeve spline teeth, the sleeve spline teeth each having a sleeve tooth tip and first and second sleeve tooth sides extending from the sleeve tooth tip, wherein the first sleeve tooth side is angled with respect to the sleeve tooth tip at a first angle, the second sleeve tooth side is angled with respect to the sleeve tooth tip at a second angle and wherein each of the sleeve tooth tips is blunt; and
a blocker ring having blocker spline teeth configured to engage with the sleeve spline teeth.

2. The synchronizer of claim 1 wherein the first angle is different than the second angle.

3. The synchronizer of claim 1 wherein each of the blocker spline teeth have a blocker tooth tip and first and second blocker tooth sides extending from the blocker tooth tip, and wherein the first blocker tooth side is angled with respect to the blocker tooth tip at the first angle and the second blocker tooth side is angled with respect to the blocker tooth tip at the second angle.

4. The synchronizer of claim 3 wherein the second sleeve tooth sides contact the second blocker tooth sides when the sleeve moves axially to engage the blocker ring.

5. The synchronizer of claim 1 wherein the blocker spline teeth and the sleeve spline teeth each have a longitudinal axis and are asymmetrical about the longitudinal axis.

6. The synchronizer of claim 1 wherein each of the blocker spline teeth has a blunt tip.

7. The synchronizer of claim 1 wherein the sleeve rotates about an axis of rotation, and the advanced sleeve spline teeth extend along the axis of rotation farther than the sleeve spline teeth.

8. The synchronizer of claim 1 wherein the first angle is approximately equal to 40 degrees and the second angle is approximately equal to 50 degrees.

9. The synchronizer of claim 1 wherein the first angle is approximately equal to 55 degrees and the second angle is approximately equal to 50 degrees.

10. An assembly for a motor vehicle comprising:
a shaft that defines an axis;
a gear concentric to the axis;
a sleeve connected for common rotation with the shaft and translatable along the axis, the sleeve having sleeve spline teeth and advanced sleeve spline teeth, wherein the sleeve spline teeth are each asymmetrical along a longitudinal line of each sleeve spline tooth; and
a blocker ring disposed between the gear and the sleeve, the blocker ring having blocker spline teeth configured to engage with the sleeve spline teeth, wherein the blocker spline teeth are each asymmetrical along a longitudinal line of each blocker spline tooth, and wherein each of the blocker spline teeth include a blocker spline tooth tip that is blunt,
wherein the sleeve spline teeth engage the blocker spline teeth when the sleeve is in a blocking position and the sleeve spline teeth engage the gear when in a synchronized position.

11. The assembly of claim 10 wherein during a pre-synchronization stage, longitudinal movement of the sleeve in the direction of the gear moves the blocker ring towards a cone surface on the gear and a frusto-conical surface on the blocker ring engages the cone surface of the gear which indexes the blocker ring.

12. The assembly of claim 10 wherein the sleeve spline teeth each have a sleeve tooth tip and first and second sleeve tooth sides extending from the sleeve tooth tip, wherein the first sleeve tooth side is angled with respect to the sleeve tooth tip at a first angle, and the second sleeve tooth side is angled with respect to the sleeve tooth tip at a second angle.

13. The assembly of claim 12 wherein each of the blocker spline teeth have first and second blocker tooth sides extending from the blocker tooth tip, and wherein the first blocker tooth side is angled with respect to the blocker tooth tip at the first angle and the second blocker tooth side is angled with respect to the blocker tooth tip at the second angle.

14. The assembly of claim 13 wherein the first angle is different than the second angle.

15. The assembly of claim 10 further comprising a hub splined to the shaft, a strut connected to the hub and splined to the sleeve, and bias elements and detents to bias the sleeve to a neutral position.

16. A synchronizer for a transmission of a motor vehicle, the synchronizer comprising:
a sleeve having sleeve spline teeth and advanced sleeve spline teeth, the sleeve spline teeth each having a sleeve tooth tip and first and second sleeve tooth sides extending from the sleeve tooth tip, wherein the first sleeve tooth side is angled with respect to the sleeve tooth tip at a first angle, and the second sleeve tooth side is angled with respect to the sleeve tooth tip at a second angle, and wherein each of the sleeve tooth tips is flat and perpendicular to a longitudinal axis of each tooth; and
a blocker ring having blocker spline teeth configured to engage with the sleeve spline teeth, each of the blocker spline teeth having a blocker tooth tip and first and second blocker tooth sides extending from the blocker tooth tip, and wherein the first blocker tooth side is angled with respect to the blocker tooth tip at the first angle and the second blocker tooth side is angled with respect to the blocker tooth tip at the second angle, and each of the blocker tooth tips is flat and perpendicular to a longitudinal axis of each tooth,
wherein the first angle is different than the second angle.

17. The synchronizer of claim 16 wherein the sleeve rotates about an axis of rotation, and the advanced sleeve spline teeth extend along the axis of rotation farther than the sleeve spline teeth.

18. The synchronizer of claim 17 wherein each of the advanced spline teeth have a first divergent surface that connects to a second divergent surface at an apex, and the first divergent surface is angled with respect to a longitudinal axis of the advanced spline tooth at a third angle, the second divergent surface is angled with respect to the longitudinal axis of the advanced spline tooth at a fourth angle, and wherein the third angle does not equal the fourth angle.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Cousins William L
• Villegas Kristopher
• Rooney Todd W

Classifications

• F16D23/06 Primary

  and a blocking mechanism preventing the engagement of the main clutch prior to synchronisation · CPC title

• F16D2023/0668

  Details relating to tooth end or tip geometry · CPC title

• F16D2023/0656

  Details of the tooth structure; Arrangements of teeth · CPC title

• F16D2023/0631

  Sliding sleeves; Details thereof · CPC title