Fig. 1

Principle coordinate system of the gear"

Fig. 2

Mathematical model of VH-CATT cylindrical gear tooth surface and solid 3D model"

Fig. 3

VH-CATT cylindrical gear contact model"

Fig. 4

Contact ellipse"

Fig.5

Distinction and addition of gear meshing areas"

Table 1

Geometrical and operating parameters of VH-CATT cylindrical gear unit"

Fig.6

Layout parameters of gear nozzle"

Fig.7

Gearbox mesh model"

Fig. 8

Cross-section streamline diagram in gearing"

Fig. 9

Enlarged view of the flow lines above the engagement zone when not injected with oil"

Fig. 10

Four sets of nozzle angle settings"

Fig. 11

Distribution of oil in four groups of tooth surfaces"

Fig. 12

Weighted average oil volume fraction versus time at different injection angles"

Fig. 13

Tooth surface oil pressure under four groups"

Fig. 14

Oil pressure in the drive gear at four groups"

Fig. 15

Oil volume fraction distribution on tooth surface at different injection speeds"

Fig. 16

Variation of weighted average oil volume fraction with time for different injection speeds"

Fig. 17

Oil pressure statistics in the meshing zone at different injection speeds"

Fig. 18

Oil volume fraction distribution on tooth surface at different injection heights"

Fig. 19

Variation of weighted average oil volume fraction with time for different injection heights"

Fig. 20

Oil pressure statistics in the meshing zone at different injection heights"

Fig. 21

Oil volume fraction distribution on tooth surface at different gear speeds"

Fig. 22

Variation of weighted average oil volume fraction with time for different gear speeds"

Fig. 23

Oil pressure statistics in the meshing zone at different gear speeds"