CN2850067Y

CN2850067Y - Safety air-bag clock spring

Info

Publication number: CN2850067Y
Application number: CN 200520118784
Authority: CN
Inventors: 温俊; 奚兴超; 钱勇; 邹财松
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-09-13
Filing date: 2005-09-13
Publication date: 2006-12-20
Anticipated expiration: 2015-09-13

Abstract

A safety air-bag clock spring comprises a casing, a flat line (3), and a central rotary sleeve (5), wherein the safety air-bag clock spring also comprises a distributing terminal board (4) and a gear (6); the casing comprises an upper body (2) and a lower body (7) provided with an internal meshing gear (13); the internal meshing gear (13)of the lower casing (7) and the external meshing gear (12)of the central rotary sleeve are taken as the centre gear, and the gear (6)is taken as the planetary wheel, to form a planetary gear transmission; a distributing terminal board (4) connects with an axle center of the gear (6); both ends of the flat line (3) are respectively fixed to the upper body (2) and the lower body (7), and the flat line (3) wraps on the distributing terminal board (4) and the upper body (2).

Description

The air bag clock spring

Technical field

The utility model relates to a kind of air bag clock spring.

Background technology

Air bag clock spring (SRS Clock Spring) is the functional module that is used to connect steering wheel functional part, safety airbag wire harness and instrument wire harness, realized being connected of the signal of telecommunication between air bag electronic control module and driver airbag module and steering wheel button and car load the corresponding function module.

Existing air bag clock spring generally comprises housing, flat wire and central turnplate, described housing is fixed on the unit switch of steering spindle, in the top direction of insertion dish of central turnplate, the flat wire that is the spiral type coiling is contained between central turnplate and the installation housing, the input of flat wire is fixed on the housing, and output is fixed on the rotating disk.When the steering wheel left-right rotation, rotating disk also rotates with steering wheel, and the output that drives flat wire rotates together, thereby the flat wire that makes spiral type reel unclamps or tightens up, so both avoid flat wire to be wound on the steering spindle, guaranteed the continuity of flat wire again.Resistance when flat wire being opened in order to reduce, also group ply-yarn drill has been installed, has been dialled ply-yarn drill and be installed on the rotating disk, between the inner first lap of flat wire and second circle in the inside of air bag clock spring, the flat wire that screws is outwards pushed aside, flat wire is opened easily.But this group of line mode can not solve the breakage that the phase mutual friction causes between the coil, can not normally open when dialling the flat wire that tightens up after ply-yarn drill follows the string especially, causes the air bag clock spring to lose efficacy, thereby reduces the reliability of air bag clock spring.

The utility model content

The purpose of this utility model is the lower shortcoming of reliability that overcomes existing air bag clock spring, provides a kind of reliability higher air bag clock spring.

The air bag clock spring 1 that the utility model provides comprises housing, flat wire 3, center pivoted housing 5, and wherein, this air bag clock spring also comprises noseplate 4, gear 6; Described housing comprises upper shell 2 and lower house 7, and lower house 7 has inside engaged gear 13; Center pivoted housing 5 has external gear pump 12; With the inside engaged gear 13 of lower house 7, the external gear pump 12 of center pivoted housing 5 is centre wheel, is that planetary gear forms the planetary gear transmission with gear 6; Noseplate 4 is connected with the axle center of gear 6; The two ends of flat wire 3 are individually fixed in upper shell 2 and lower house 7, and flat wire 3 is wound in noseplate 4 and upper shell 2.

The air bag clock spring that the utility model provides has used noseplate to replace original group of ply-yarn drill, can reduce between coil long-term phase mutual friction and cause breakage, avoid simultaneously dialling that the flat wire that screws after ply-yarn drill follows the string can not normally unclamp and the situation that causes the air bag clock spring to lose efficacy, improved the reliability of air bag clock spring.And the air bag clock spring that the utility model provides has shortened the length of flat wire under the situation of rotating same number of turns.

Description of drawings

Fig. 1 is the overall schematic of air bag clock spring of the present utility model;

Fig. 2 is the general components schematic diagram of air bag clock spring of the present utility model;

Fig. 3 is the lower house schematic diagram of air bag clock spring of the present utility model;

Fig. 4 is the planetary gear transmission schematic diagram that lower house, center pivoted housing, the gear of air bag clock spring of the present utility model formed;

Fig. 5 is the noseplate schematic diagram of air bag clock spring of the present utility model;

Fig. 6 is the noseplate and the pinion combination schematic diagram of air bag clock spring of the present utility model;

Fig. 7 is lower house, center pivoted housing, pinion, the noseplate combination schematic diagram of air bag clock spring of the present utility model;

Fig. 8 is the upper shell and the center pivoted housing combination schematic diagram of air bag clock spring of the present utility model;

Fig. 9 is air bag clock spring of the present utility model schematic diagram when rotating counterclockwise the limit;

Figure 10 is air bag clock spring of the present utility model schematic diagram when clockwise rotating the limit.

Embodiment

The air bag clock spring that the utility model is provided is elaborated with reference to the accompanying drawings.

As shown in Figure 2, the air bag clock spring that the utility model provides comprises housing, flat wire 3, center pivoted housing 5, noseplate 4, gear 6, and wherein said housing comprises upper shell 2 and lower house 7.

As shown in Figure 2, upper shell 2 comprises top and inner ring 9, has buckle 8 on the top, and the center at top has the hole.Center pivoted housing 5 links to each other with the steering spindle of automobile, and under the preferable case, the center of center pivoted housing 5 has the hole with steering spindle engagement, and steering spindle is passed this hole, so steering spindle drives center pivoted housing 5 when rotating and rotates.The outside, center pivoted housing 5 bottoms has external gear pump 12, and pivoted housing 5 upper outside in center are meshed with inner ring 9 inboards of upper shell 2.As shown in Figure 8, pivoted housing 5 tops in center are arranged in the inner ring 9 of upper shell 2, drive upper shell 2 and rotate when center pivoted housing 5 rotates.

As shown in Figure 3, lower house 7 comprises circular bottom part and sidewall, and the inside sidewalls bottom has inside engaged gear 13, and sidewall has opening 15, in the sidewall outside buckle 16 is arranged, and lower house 7 is fixed on the steering column.Under the preferable case, the bottom of lower house 7 has the mistake proofing hole 14 that is used for determining gear 6 initial cooperation positions.

As shown in Figure 4, the external gear pump 12 of the inside engaged gear 13 of lower house 7, center pivoted housing 5 and gear 6 are formed planetary transmission system.Its middle gear 6 is a planetary gear, the inside engaged gear 13 of lower house 7 and the external gear pump 12 of center pivoted housing 5 are respectively outer centre wheel and interior centre wheel, so just can carry out the planetary gear transmission, gearratio is: the i=1+ external gear pump number of teeth/inside engaged gear number of teeth.In this planetary gear transmission, because lower house is fixed on the steering column and does not rotate, therefore in described planetary gear transmission, driven gear 6 rotated when the external gear pump 12 of center pivoted housing 5 rotated, and 13 of the inside engaged gears of lower house 7 maintain static.

As shown in Figure 5, noseplate 4 is preferably circular structure, and top has opening 11, and the two ends of opening are respectively 4a, 4b, and wherein, the inboard of preferred 4a port is more flat than another port 4b, so that noseplate 4 carries out separated time.Noseplate 4 can adopt variety of way with the axle center ways of connecting of gear 6, and the utility model is not limited in this respect.Under the preferable case, as shown in Figure 6, the bottom of noseplate 4 has gear and buckles 10, and gear 6 has central shaft hole 17, gear buckle 10 be anchored in the central shaft hole 17 and with central shaft hole 17 engagements.

As shown in Figure 7, the inside engaged gear 13 of lower house 7, the external gear pump 12 of center pivoted housing 5 and gear 6 are formed planetary transmission system, and noseplate 4 is connected with the axle center of gear 6.Its middle gear 6 is a planetary gear, and the inside engaged gear 13 of lower house 7 and the external gear pump 12 of center pivoted housing 5 are respectively outer centre wheel and interior centre wheel, and the noseplate center overlaps with the center of planetary transmission system.Gear 6 detours center when revolution of star drive system, drive the detour center of star drive system of noseplate 4 and rotate, and the speed that noseplate 4 rotates is identical with the revolution speed of pinion 6.

When Fig. 9 and Figure 10 represent respectively that air bag clock spring of the present utility model rotates counterclockwise the limit and when clockwise rotating the limit, the rotation situation of the combination of noseplate 4, upper shell inner ring 9 and center pivoted housing 5, and the winding of flat wire 3 on noseplate 4 and upper shell inner ring 9.Upper shell inner ring 9 is positioned at the inboard of the circular structure of noseplate 4, flat wire 3 is between upper shell inner ring 9 and noseplate 4, the external port 3b of flat wire 3 passes noseplate opening 11, thus flat wire 3 is wrapped on the upper shell inner ring 9 and the outside of the circular structure of noseplate 4 on.

As shown in Figure 9, flat wire 3 comprises inner port 3a and external port 3b, and inner port 3a is fixed on the buckle 8 of upper shell, and external port 3b is fixed on the buckle 16 of lower house.This moment, flat wire 3 all was wound in the outside of upper shell inner ring 9, and noseplate opening 11 is in position A, and the external port 3b of flat wire 3 draws from lower house opening 15 by noseplate opening 11, is buckled on the buckle 16 of lower house.When the center pivoted housing 5 of steering spindle drive air bag clock spring clockwise rotated, center pivoted housing 5 drove upper shells 2 and clockwise rotates, and the flat wire 3 that is wrapped on the upper shell inner ring 9 begins to unclamp; Simultaneously, started working by the planetary transmission system that inside engaged gear 13, the external gear pump 12 of center pivoted

housing

5,6 three parts of gear of lower house 7 are formed, in gear 6 detour center when revolution of star drive system, drive noseplate 4 and also clockwise rotate; Lower house 7 is fixed on the steering column and does not rotate; By port 4a flat wire is carried out separated time when therefore noseplate 4 rotates, flat wire 3 begins to be wound on the noseplate, and the flat wire in upper shell inner ring 9 outsides begins to throw off upper shell inner ring 9 outsides simultaneously, promptly carries out Xie Quan in upper shell inner ring 9 outsides.

As shown in figure 10, when going to the limit clockwise, the flat wire 3 in upper shell inner ring 9 outsides all is wound on the noseplate 4, and noseplate opening 11 is in position B, and flat wire inner port 3a directly is stuck on the upper shell buckle 8 by noseplate opening 16.

Owing to used planetary gear mechanism, under the situation of rotating same number of turns, flat wire 3 length have been shortened, this is because upper shell inner ring 9 is when rotating, also doing and the identical rotation of upper shell inner ring 9 rotation directions by the noseplate 4 that gear 6 drives, suppose that upper shell inner ring 9 has rotated 1 circle, noseplate 4 equidirectional 1/i circles that also rotated then, so actual flat wire 3 housing inner ring 9 outer felt around or the number of adapter ring be 1-1/i; When upper shell inner ring 9 has rotated the N circle, the equidirectional N/i circle that also rotated of noseplate then, so actual flat wire 3 housing inner ring 9 outer felt around or the number of adapter ring be N-N/i.Can be understood as conversely, use planetary gear mechanism can save the length of N/i circle flat wire.If it is a that flat wire can be wrapped in the number of turns in housing inner ring 9 outsides, the actual number of turns that can rotate of air bag clock spring is b (also being the number of turns that upper shell rotates), and both passes are so: b=a+a/i.

Claims

1, a kind of air bag clock spring, this air bag clock spring comprise housing, flat wire (3), center pivoted housing (5), it is characterized in that, this air bag clock spring also comprises noseplate (4), gear (6); Described housing comprises upper shell (2) and lower house (7), and lower house (7) has inside engaged gear (13); Center pivoted housing (5) has external gear pump (12); With the inside engaged gear (13) of lower house (7), the external gear pump (12) of center pivoted housing (5) is centre wheel, is that planetary gear forms the planetary gear transmission with gear (6); Noseplate (4) is connected with the axle center of gear (6); The two ends of flat wire (3) are individually fixed in upper shell (2) and lower house (7), and flat wire (3) is wound in noseplate (4) and upper shell (2).

2, air bag clock spring according to claim 1, wherein, noseplate (4) is a circular structure, top has opening (11); Upper shell (2) comprises inner ring (9), and inner ring (9) is positioned at the inboard of the circular structure of noseplate (4); Flat wire (3) comprises inner port (3a) and external port (3b), flat wire (3) is positioned between upper shell inner ring (9) and the noseplate (4), external port (3b) is passed noseplate opening (11), flat wire (3) be wrapped in that upper shell inner ring (9) is gone up and the outside of the circular structure of noseplate (4) on.

3, air bag clock spring according to claim 1, wherein, in described planetary gear transmission, driven gear (6) rotated when the external gear pump (12) of center pivoted housing (5) rotated, and the inside engaged gear (13) of lower house (7) maintains static.

4, air bag clock spring according to claim 1, wherein, upper shell (2) has buckle (8), and lower house (7) has buckle (16); Flat wire (3) comprises inner port (3a) and external port (3b), and inner port (3a) is fixed on the buckle (8) of upper shell (2), and external port (3b) is fixed on the buckle (16) of lower house.

5, air bag clock spring according to claim 1, wherein, the bottom of noseplate (4) has gear and buckles (10), and gear (6) has central shaft hole (17), and gear is buckled (10) and is anchored in the central shaft hole (17) and with central shaft hole (17) and meshes.

6, air bag clock spring according to claim 1, wherein, upper shell (2) comprises inner ring (9), inner ring (9) inner mesh of center pivoted housing (5) upper outside and upper shell (2), and center pivoted housing (5) top is arranged in the inner ring (9) of upper shell (2).