CN2916261Y

CN2916261Y - Reverse gear device for pedal type motor tricycle

Info

Publication number: CN2916261Y
Application number: CN 200520010457
Authority: CN
Inventors: 徐梅生
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-06
Filing date: 2005-12-06
Publication date: 2007-06-27
Anticipated expiration: 2015-12-06

Abstract

A foot-treadle three-wheel motorcycle reverse gear is provided, which comprises a reverse shift shaft (1), a gear fork shaft (2), a spline output shaft (3), a small gear fork (4), a big gear fork (5), a forward bevel gear (7), a backward bevel gear (6), a driving bevel gear (12), and a gear fork drum (8). A shaft pin (9) is positioned symmetrically on the two sides of the top of the big gear fork (5). Axle line of the shaft pin (9) is intersected with shaft hole of the big gear fork (5) and central line of the positioning hole (5a). At the lower end of the two fork feet of the small gear fork (4) is provided with U-shaped sliding groove (1a) which is limited on the shaft pin (9). The utility model has the advantages of more reasonable structure and better tenacity, and no damage and rupture will occur to the components with precise and reliable positioning, therefore, the utility model will cause no gear shifting or gear sliding and its safety could be enhanced as well.

Description

Pedal motor tricycle reverse gear

Technical field

The utility model relates to the Motor Vehicle gear reversing device, specifically, relates to a kind of pedal motor tricycle reverse gear.

Background technique

Existing pedal motor tricycle reverse gear mainly is made of shift shaft, declutch shift shaft, little shift fork, big shift fork, spline output shaft, shift fork drum, drive bevel gear, the advance bevel gear and the bevel gear that falls back etc.As shown in Figure 1, little shift fork 4 is installed on the shift shaft 1, and big shift fork 5 is installed on the declutch shift shaft 2, and the shift fork pin of little shift fork 4 is spacing in the vertical slot of big shift fork 5.During gear shift, foot-treadle drives shift shaft 1 and rotates, shift shaft 1 drives the shaft axis left rotation and right rotation of little shift fork 4 around shift shaft 1, little shift fork 4 shift fork pin slide up and down in the vertical slot of big shift fork 5, promote big shift fork 5 move left and right on declutch shift shaft 2, thereby promote shift fork drum move left and right on the spline output shaft, realize advancing or falling back.There is following problem in this reverse gear:

1, the degree of symmetry that adds 5 liang of vertical slot of big shift fork in man-hour and declutch shift shaft 2 centers and vertical slot two side and positioning hole all is difficult to be guaranteed, the distance of end angle, little shift fork 4 shift fork underfooting move left and right also is difficult to be guaranteed with the degree of symmetry of positioning hole when therefore working, have deviation, shift fork drum, declutch shift shaft 2 locating slots and shift shaft 1 positioning cam can not accurately be put in place synchronously, locating effect is not good, thus long back or load trip stop or sliding shelves take place when big easily in use;

2, interfere with the vertical slot two side of big shift fork 5 in rotation process for fear of the shift fork pin of little shift fork 4, the shift fork pin of little shift fork 4 becomes fan-shaped, thereby make the heel portion of little shift fork 4 very narrow, weak strength, if overexert during gear shift, the heel portion of little shift fork 4 is easy to rupture;

3, little shift fork 4 and big shift fork 5 form through casting usually, and surface roughness is poor, are sliding contact between little shift fork 4 and the big shift fork, and surface friction drag is big, has increased driving torque, and steady inadequately in the movement process.

The model utility content

The purpose of this utility model provides a kind of pedal motor tricycle reverse gear, and to solve the unreasonable structure of existing pedal motor tricycle reverse gear, the location is inaccurate, occurs the problem of trip stop, sliding shelves and component fracture damage in the use easily.

For this reason, pedal motor tricycle reverse gear described in the utility model, comprise shift shaft, declutch shift shaft and spline output shaft, little shift fork is installed on the shift shaft, big shift fork is installed on the declutch shift shaft, on the big shift fork positioning hole is arranged, pressure spring is housed in the positioning hole, the upper end of pressure spring has the locating slot on locking ball and the declutch shift shaft suitable, be set with the advance bevel gear and the bevel gear that falls back on the spline output shaft, the shift fork drum that advances bevel gear and fall back between the bevel gear passes through the spline kink on the spline output shaft, symmetry is provided with pivot pin on the bi-side, big shift fork upper end, the shaft axis of this pivot pin intersects vertically with the axis hole center line and the hole centre line of big shift fork, and two shift fork underfooting ends of little shift fork are provided with the U-shaped chute, and this U-shaped chute is spacing on described pivot pin.

In the utility model since little shift fork with connect by U-shaped chute and pivot pin between the shift fork greatly, little shift fork directly acts on the pivot pin of big shift fork with its U-shaped chute, its Point of Strength is all the time on the central point of shift fork axis hole, little shift fork drives big shift fork along declutch shift shaft substantially horizontal move left and right when rotating under shift shaft drives, the angle of little shift fork left-right rotation is corresponding all the time accurately consistent with the distance of big shift fork move left and right, make shift shaft, size shift fork and shift fork drum synchronized movement unanimity, and accurate positioning is reliable, form making a concerted effort of locking, effectively prevent trip stop, the generation of sliding shelves phenomenon.Simultaneously, little shift fork two shift fork pin big or small unanimous between the higher and lower levels, intensity is good, thereby has avoided the problem that in use occurs rupturing because of overexerting.

The beneficial effects of the utility model are: structure is more reasonable, and intensity is good, the problem of component fracture damage can not occur, accurate positioning, reliable, thereby trip stop or sliding shelves can not appear, improved the Security of its use.

Description of drawings

Fig. 1 is the assembly relation schematic representation of medium and small shift fork 4 of prior art and big shift fork 5;

Fig. 2 is a structural representation of the present utility model;

Fig. 3 is the cut-away diagram of big shift fork 5 and declutch shift shaft 2 combinations among Fig. 2.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:

As Fig. 2, shown in Figure 3, pedal motor tricycle reverse gear described in the utility model, has shift shaft 1, declutch shift shaft 2 and spline output shaft 3, little shift fork 4 is installed on the shift shaft 1, big shift fork 5 is installed on the declutch shift shaft 2, on the big shift fork 5 positioning hole 5a is arranged, pressure spring 10 is housed in the positioning hole 5a, the upper end of pressure spring 10 has locking ball 11 suitable with the locating slot 2a on the declutch shift shaft 2, be set with the advance bevel gear 7 and the bevel gear 6 that falls back on the spline output shaft 3, the shift fork drum 8 that advances bevel gear 7 and fall back between the bevel gear 6 passes through the spline kink on spline output shaft 3, symmetry is provided with pivot pin 9 on the big bi-side, shift fork 5 upper end, the axis hole center line and the positioning hole 5a vertical and intersectant centerline of the shaft axis of this pivot pin 9 and big shift fork 5, two shift fork underfooting ends of little shift fork 1 are provided with U-shaped chute 1a, and this U-shaped chute 1a is spacing on described pivot pin 9.

The circular arc shift fork pin center of big shift fork 5 and the distance between spline output shaft 3 shaft axiss are 5 ± 0.1mm, the degree of depth of the spring eye 5a of big shift fork 5 is 16 ± 0.1mm, and existing pedal motor tricycle reverse gear, distance between its big shift fork 5 circular arc shift fork pin centers and spline output shaft 3 shaft axiss is generally about 12.5mm, under the condition that the distance between declutch shift shaft 2 and the spline output shaft 3 remains unchanged, the curved profile of big shift fork 5 shift fork pin moves down, thereby make spring eye 5a can do deeplyer, can reach 16 ± 0.1mm, the length of pressure spring 10 increases, elastic force is stronger, greatly,

little shift fork

5 and 4 operation are more freely, the gear shift coupling mechanism force between the locating slot 2a that puts in place on back locking ball 11 and the declutch shift shaft 2 is stronger, thereby improves reliability of positioning, prevents trip stop or sliding grade.Label 12 is spring tops among Fig. 1, the 13rd, and foot-operated.

Claims

1, a kind of pedal motor tricycle reverse gear, comprise shift shaft (1), declutch shift shaft (2) and spline output shaft (3), little shift fork (4) is installed on the shift shaft (1), big shift fork (5) is installed on the declutch shift shaft (2), on the big shift fork (5) positioning hole (5a) is arranged, pressure spring (10) is equipped with in positioning hole (5a) lining, the upper end of pressure spring (10) has locking ball (11) suitable with the locating slot (2a) on the declutch shift shaft (2), be set with bevel gear that advances (7) and the bevel gear that falls back (6) on the spline output shaft (3), the shift fork drum (8) that advances between bevel gear (7) and the bevel gear that falls back (6) passes through the spline kink on spline output shaft (3), it is characterized in that: symmetry is provided with pivot pin (9) on the bi-side, described big shift fork (5) upper end, the axis hole center line and positioning hole (5a) vertical and intersectant centerline of shaft axis of this pivot pin (9) and big shift fork (5), two shift fork underfooting ends of little shift fork (1) are provided with U-shaped chute (1a), and this U-shaped chute (1a) is spacing on described pivot pin (9).

2, pedal motor tricycle reverse gear according to claim 1, it is characterized in that: the distance between the circular arc shift fork pin center of described big shift fork (5) and spline output shaft (3) shaft axis is between 5 ± 0.1mm, and the degree of depth in big shift fork (5) upper spring hole (5a) is 16 ± 0.1mm.