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Automatic Transmission

An automatic transmission and low-speed technology, which is applied in vehicle gearboxes, instruments, transmissions, etc., can solve the problems of large friction loss and achieve the effects of reducing friction loss, suppressing the increase of force, and suppressing pressing force

Active Publication Date: 2018-12-28
JATCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the pressing force is large, there is a problem that the frictional loss accompanying the sliding contact is large.

Method used

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  • Automatic Transmission
  • Automatic Transmission
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] figure 1 It is a schematic system diagram showing the automatic transmission of the first embodiment. An automatic transmission 3 is connected to an engine output shaft 1 a of the engine 1 via a clutch 2 . The automatic transmission 3 has a first shaft 301 connected to the automatic transmission side of the clutch 2 , and a second shaft 302 arranged in parallel to the first shaft 301 . On the first shaft 301, there are a first-speed drive gear 311 (corresponding to a first low-speed gear), a second-speed drive gear 321 (corresponding to a first high-speed gear), and rotatably supported relative to the first shaft 301 . 3rd speed drive gear 331 and 4th speed drive gear 341 . On the second shaft 302, there are a first-speed driven gear 312 (corresponding to the second low-speed gear) and a second-speed driven gear 322 (corresponding to the second high-speed gear), which are fixed on the second shaft 302 and rotate integrally with the second shaft 302 . gear), 3-speed d...

Embodiment 2

[0090] Next, Example 2 will be described. Since the basic configuration is the same as that of Embodiment 1, only the points of difference will be described. Figure 6 It is a schematic sectional view showing the structure of the positioning groove of the second embodiment. In Example 1, the second urging slope 31b12 has an inclination angle θ2. In contrast, the inclination angle of the lifting position is set to 0, in other words, a flat surface 31b13 parallel to the lifting direction is formed, and a third biasing inclined surface 31b14 having a predetermined inclination angle is formed on the flat surface 31b13. As a result, after the first clutch claw 33c for the first speed is lifted, the flat surface 31b13 contacted by the check valve ball 31b2 exerts all the urging force of the elastic body 31b4 in the direction perpendicular to the lifting direction, so that it is possible to further suppress the The pressing force between the right inner side surface 31a of the firs...

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Abstract

According to the present invention, provided is an automatic transmission capable of realizing seamless shift while inhibiting a frictional loss between a shift pork and a clutch ring. The automatic transmission comprises a pressing member to regulate an axial directional position of the shift port and a position determination groove having an inclined pressing surface. The inclined pressing surface includes a first inclined pressing surface where the pressing member is in contact with before a low speed clutch ring dog is lifted, and a second inclined pressing surface where the pressing member is in contact with after the low speed clutch ring dog is lifted. The second inclined pressing surface has an inclination angle smaller than that of the first inclined pressing surface.

Description

technical field [0001] The present invention relates to an automatic transmission capable of shifting gears without interruption of torque transmission. Background technique [0002] Patent Document 1 discloses an automatic transmission capable of shifting (hereinafter referred to as seamless shifting) without interruption of torque transmission in a parallel twin-shaft type constant mesh transmission. For example, when the first speed is upshifted to the second speed while driving, if the clutch ring for second speed meshed with the second speed gear is engaged, an inertial torque acts on the first speed gear. This inertial torque generates an axial force in the disengagement direction on the first-speed clutch ring, enabling seamless shifting to the second-speed. [0003] Patent Document 1: (Japanese) Unexamined Patent Application Publication No. 2012-127471 [0004] Here, when realizing seamless shifting, the position of the clutch ring is controlled by the shift fork, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H61/32F16H63/32
CPCF16H61/0204F16H61/32F16H63/32F16H2306/00F16H3/083F16H2200/0034
Inventor 栗田崇志
Owner JATCO LTD
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