Clutch device of automobile pre-tightening type safety belt retractor

Abstract

The invention provides a clutch device of a pre-tightening type safety belt retractor, and belongs to the technical field of automobile safety belt retractor structures. According to the clutch device, through the structural design of the power cut-off part, the pawl and the ratchet ring fixed to the input part in the circumferential direction, the problems that in the prior art, a locking claw is difficult to machine, the percent of pass is not high, and the working reliability is relatively low are solved. The clutch device further comprises a power cut-off part, a pawl and a ratchet ring fixed to the input part in the circumferential direction. When the gunpowder pre-tightening assembly is not started, the pawl is located at the initial position of the main shaft. When the gunpowder pre-tightening assembly is started, the pawl moves to the joint position of the main shaft, and the main shaft is coupled to the ratchet ring. The ratchet ring drives the power cut-off part to fix the locking claw at the initial position of the input part; and after the gunpowder pre-tightening assembly finishes pre-tightening, the pawl returns to the initial position of the main shaft.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile safety belt retractor structures, and in particular relates to a clutch device of a pre-tensioned safety belt retractor. Background Art

[0002] As people's living standards continue to improve, cars have become an important means of transportation for family travel. In line with this, consumers are paying more and more attention to car safety. More and more people will choose models equipped with active pre-tensioned seat belts when buying cars. In order to meet market demand and improve the competitiveness of their products, automobile manufacturers are also actively developing and promoting this safety technology. Active pre-tensioned seat belts receive the predicted driving danger signals of the active safety system and perform the active pre-tensioning function of the seat belt before a collision accident occurs. The active part circuit board controls the motor to rotate through the deceleration system to drive the core shaft to pull back the webbing, eliminate the gap in the seat belt or restrict the sitting posture of the occupant. When the vehicle collides, the passive part gunpowder pre-tensioning starts to tighten, the webbing is recovered, and then the occupant moves forward, the webbing is pulled out, and the active part is not separated from the core shaft for power transmission, which will cause overshoot, thereby increasing the risk of occupant injury.

[0003] In order to solve the problem that the overshoot phenomenon may easily cause injuries to passengers, a seat belt retractor is described in the specification of the Chinese invention patent with application publication number CN102666215A. After the gunpowder pre-tightening is started, the seat belt retractor drives the claw 41 to move through multiple connectors fixed on the main shaft 12, and the engaging portion 41a provided at the end of the claw 41 engages with the inner teeth 50a of the clutch housing 50, thereby cutting off the connection between the main shaft 12 and the clutch. The specification of the Chinese invention patent with application publication number CN104039607A describes a coupling with a tensioning device, which is embedded in the driving meshing portion through the coupling teeth 48, 50, 52 in the middle of the coupling claw 40, thereby cutting off the connection between its shaft end 22 and the coupling (i.e., the clutch).

[0004] Although the technical solutions of the above two patents rely on the special shape design of the claw (or locking claw) and the claw under the action of the inertia force of other components to achieve the function of cutting off the clutch and the main shaft, thereby avoiding overshoot; however, this type of technical solution, on the one hand, has special requirements on the shape of the claw, and on the other hand, relies on the inertia force to drive, so that the shape, center of mass and weight of the claw are also restricted, resulting in the problem that the claw is difficult to process and the qualified rate is not high; at the same time, relying on the inertia force to drive the claw, the reliability is relatively low. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a clutch device for a vehicle pretensioner seat belt retractor, which is used to solve the problems in the prior art that the locking claw is difficult to process, the qualified rate is not high, and the working reliability is relatively low, which easily causes the locking claw to be difficult to process, the qualified rate is not high, and the working reliability is relatively low.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a clutch device for a pre-tensioned seat belt retractor for an automobile, which transmits the power of the electric component of the retractor to the main shaft, and cuts off the power connection between the electric component and the main shaft when the gunpowder pre-tensioning component is started; it includes an input part, a locking pawl and a locking wheel circumferentially fixed on the main shaft; the locking pawl is movably supported between the initial position and the engagement position of the input part, and couples the input part to the locking wheel at the engagement position of the input part; it also includes a power cut-off part, a pawl and a ratchet ring circumferentially fixed on the input part; when the gunpowder pre-tensioning component is not started, the pawl is located at the initial position of the main shaft; when the gunpowder pre-tensioning component is started, the pawl moves to the engagement position of the main shaft and couples the main shaft to the ratchet ring; the ratchet ring drives the power cut-off part to fix the locking pawl at the initial position of the input part; after the pre-tensioning of the gunpowder pre-tensioning component is completed, the pawl returns to the initial position of the main shaft.

[0007] Optionally, the input part includes a turbine and a drive disk; a disk groove is opened on the turbine, and the drive disk is installed in the disk groove; when the gunpowder pretensioning assembly is not started, the drive disk rotates within a limited extent in the disk groove, and drives the locking claw to extend out of the inner wall of the turbine and engage with the locking wheel, or retract into the turbine to disengage and engage with the locking wheel; when the gunpowder pretensioning assembly is started, the drive disk is fixed in the disk groove, and the locking claw retracts into the turbine to disengage and engage with the locking wheel.

[0008] Optionally, the power cut-off part includes: a limit groove, which is opened on the driving disk; an elastic arm, which is arranged on one side of the limit groove; a limit slide groove, which is formed by the elastic arm and the inner wall of the disk groove; a limit boss, which is fixed in the disk groove; when the gunpowder pre-tensioning assembly is not started, the limit boss is located in the limit slide groove; when the gunpowder pre-tensioning assembly is started, the limit boss is separated from the limit slide groove, enters the limit groove, and is rigidly connected to the limit groove, and the driving disk is fixed in the disk groove.

[0009] Optionally, a hinge column is fixedly connected to the locking claw, a sliding groove is provided on the driving disk, and the hinge column is installed in the sliding groove; the rotation of the driving disk drives the hinge column to slide in the sliding groove, and the sliding of the hinge column drives the locking claw to extend outward or retract out of the inner wall of the turbine.

[0010] Optionally, a positioning pin is fixedly connected to the driving disk, and a positioning groove is provided on the ratchet ring; when the gunpowder pretensioning assembly is not started, the positioning pin and the positioning groove are fixedly connected to fix the ratchet ring to the driving disk; when the gunpowder pretensioning assembly is started, the ratchet ring continues to rotate to shear off the positioning pin.

[0011] Optionally, it also includes an elastic fixing part, and a pawl groove is provided on the main shaft; when the gunpowder pre-tensioning assembly is not started, the elastic fixing part fixes the pawl in the pawl groove; when the gunpowder pre-tensioning assembly is started, the pawl generates centrifugal force as the main shaft rotates reversely, breaks away from the constraint of the elastic fixing part, and the claw end of the pawl breaks away from the pawl groove and engages with the ratchet ring, driving the ratchet ring to rotate; after the pre-tensioning of the gunpowder pre-tensioning assembly is completed, the pawl generates centripetal force as the main shaft rotates forward, the pawl returns to the pawl groove, and the claw end of the pawl disengages from the ratchet ring.

[0012] Optionally, the elastic fixing member is an arc spring; when the gunpowder preload assembly is not activated, one end of the arc spring is connected to the pawl, and the other end is connected to the main shaft.

[0013] Optionally, the elastic fixing member is a compression spring; when the gunpowder preload assembly is not activated, the compression spring presses the pawl into the pawl groove.

[0014] As described above, the clutch device of the automobile pre-tensioning seat belt retractor of the present invention has at least the following beneficial effects:

[0015] The clutch device of the automobile pre-tensioning seat belt retractor solves the problems in the prior art that the locking pawl is difficult to process, the qualified rate is not high, and the working reliability is relatively low, through the structural design of the power cut-off part, the pawl and the ratchet ring fixed circumferentially on the input part, and the structural design that the locking pawl is driven to engage with the clutch under the action of the inertia force of other parts to cut off the power connection between the main shaft and the clutch. Specifically, when the automobile does not collide and the gunpowder pre-tensioning component is not started, the pawl of the above design is located at the initial position of the main shaft and is not connected to the gear ring, while the locking pawl couples the input part and the locking wheel together, so that the input part can rotate with the main shaft; when the automobile collides and the gunpowder pre-tensioning component is started, the force generated by the gunpowder drives the main shaft to rotate, and the pawl at the initial position of the main shaft rotates with the main shaft, thereby generating centrifugal force, and the centrifugal force drives the pawl to move to the engaging position of the main shaft, and the pawl and the ratchet ring The pawl and the ratchet are engaged, that is, the main shaft and the ratchet are coupled; the reversal of the main shaft also reverses the ratchet, and the reversal of the ratchet drives the power cutting part to fix the locking claw to the initial position of the input part, thereby cutting off the power connection between the input part and the main shaft; after the pre-tightening of the gunpowder pre-tightening assembly is completed, the pawl returns to the initial position of the main shaft as the main shaft rotates, and can no longer drive the ratchet to rotate, and finally the power connection between the input part and the main shaft is completely cut off; compared with the prior art that relies on the special shape design of the pawl (i.e., the locking pawl of the present invention) and the pawl under the action of the inertia force of other components to achieve the function of cutting off the clutch and the main shaft, thereby avoiding the overshoot phenomenon, the structural design of the cutting part, pawl and ratchet, firstly, has no special requirements on the shape of the locking claw, and secondly, does not rely on inertia force to drive, but relies on the stroke design of the pawl and the ratchet to drive the power cutting part to work, which not only reduces the processing difficulty of the locking claw, but also improves the processing qualification rate of the locking claw; at the same time, the working reliability is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is an assembly diagram of a pre-tensioned seat belt retractor for an automobile and a cross-sectional view of the gunpowder pre-tensioning portion of the present invention.

[0017] Figure 2 Shown is a schematic diagram of the input portion of the present invention.

[0018] Figure 3 Schematic diagram of the explosion of the present invention.

[0019] Figure 4 It is a schematic plan view showing the elastic fixing member of the present invention fixing the pawl.

[0020] Figure 5 It is a schematic plan view showing the engagement of the pawl and the ratchet ring of the present invention.

[0021] Figure 6 It is a plan view schematically showing the limiting boss of the present invention being in the limiting sliding groove.

[0022] Figure 7 It is a plan view schematically showing the limiting boss of the present invention being in the limiting groove.

[0023] Figure 8 It is a three-dimensional schematic diagram showing the elastic fixing member of the present invention fixing the pawl.

[0024] Fig. 9 It is a three-dimensional schematic diagram showing the limiting boss of the present invention being in the limiting sliding groove.

[0025] Fig.10 It is a three-dimensional schematic diagram showing the limiting boss of the present invention being in the limiting groove.

[0026] Component number description

[0027] Clutch device 1;

[0028] Input part 11, turbine 111, drive disc 112, disc groove 113, positioning pin 115;

[0029] Locking claw 12, hinge column 121;

[0030] Locking wheel 13;

[0031] Power cut-off portion 14, limiting groove 141, elastic arm 142, limiting slide groove 143, limiting boss 144;

[0032] Paw 15;

[0033] Ratchet ring 16, positioning groove 161;

[0034] Elastic fixing member 17;

[0035] Spindle 2, ratchet groove 21;

[0036] Electric component 3;

[0037] Gunpowder preload assembly 4. DETAILED DESCRIPTION

[0038] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0039] See also Figures 1 to 10. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0040] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0041] See also Figure 1 The present invention provides a clutch device for a pre-tensioned seat belt retractor of an automobile. Like such clutch devices in the prior art, the clutch device 1 is installed in the seat belt retractor, and the seat belt retractor comprises:

[0042] like Figure 1 The main shaft 2 shown is used for retracting and releasing the safety belt.

[0043] like Figure 1 The electric assembly 3 shown is controlled by a vehicle-mounted control module (such as a vehicle-mounted computer) to generate power to drive the main shaft 2 to rotate.

[0044] like Figure 1 The gunpowder pre-tensioning assembly 4 shown is activated when a car collides to drive the main shaft 2 to reel in the seat belt.

[0045] The connection relationship and specific structure between the main shaft 2, the electric assembly 3 and the gunpowder pre-tensioning assembly 4 have been fully disclosed in the prior art and will not be described in detail here.

[0046] like Figure 1 As shown, the present invention focuses on the clutch device 1 which transmits the power of the electric component 3 of the retractor to the main shaft 2 and cuts off the power connection between the electric component 3 and the main shaft 2 when the gunpowder pre-tensioning component 4 is started.

[0047] like Figure 2 and Figure 3As shown, the clutch device 1 includes an input part 11, a locking pawl 12 and a locking wheel 13 circumferentially fixed on the main shaft 2, just like such clutch devices 1 in the prior art; the locking pawl 12 is movably supported between an initial position and an engagement position of the input part 11, and at the engagement position of the input part 11, the input part 11 is coupled to the locking wheel 13.

[0048] The clutch device 1 of the present invention is different from the prior art in that it further includes a power cut-off portion 14 , a pawl 15 and a ratchet ring 16 circumferentially fixed on the driving disc 112 .

[0049] like Figure 4 and Figure 8 As shown, when the gunpowder preload assembly 4 is not started, the ratchet 15 is located at the initial position of the main shaft 2 .

[0050] like Figure 5 As shown, when the gunpowder preload assembly 4 is started, the ratchet 15 moves to the engagement position of the main shaft 2 and couples the main shaft 2 to the ratchet ring 16; the ratchet ring 16 drives the power cut-off part 14 to fix the locking pawl 12 at the initial position of the input part 11.

[0051] After the pre-tightening of the gunpowder pre-tightening assembly 4 is completed, the ratchet 15 returns to the initial position of the main shaft 2 .

[0052] like Figures 1 to 4 As shown, through the structural design of the power cut-off part 14, the pawl 15 and the ratchet ring 16, the problems in the prior art that rely on the special shape design of the locking pawl 12 and the structural design that drives the locking pawl 12 to engage with the clutch under the action of the inertia force of other components, thereby cutting off the power connection between the main shaft 2 and the clutch, which easily cause the locking pawl 12 to be difficult to process, have a low pass rate and relatively low working reliability, are solved.

[0053] Specifically, when the car does not collide and the gunpowder preload assembly 4 is not started, the ratchet 15 of the above design is located at the initial position of the main shaft 2 and is not connected to the gear ring, while the locking pawl 12 couples the input part 11 and the locking wheel 13 together, so that the input part 11 can rotate with the main shaft 2. When the car collides and the gunpowder preload assembly 4 is started, the force generated by the gunpowder drives the main shaft 2 to rotate, and the ratchet 15 at the initial position of the main shaft 2 rotates with the main shaft 2, thereby generating centrifugal force, which drives the ratchet 15 to move to the engagement position of the main shaft 2, and the ratchet 15 and the ratchet ring 16 are meshed, that is, the main shaft 2 and the ratchet ring 16 are coupled; the rotation of the main shaft 2 also reverses the ratchet ring 16, and the reverse rotation of the ratchet ring 16 drives the power cut-off part 14 to fix the locking pawl 12 to the initial position of the input part 11, thereby cutting off the power connection between the input part 11 and the main shaft 2. After the gunpowder pretensioning assembly 4 is pretensioned, the pawl 15 rotates in the opposite direction of the main shaft 2 and returns to the initial position of the main shaft 2, and can no longer drive the ratchet ring 16 to rotate, eventually completely cutting off the power connection between the input part 11 and the main shaft 2.

[0054] Compared with the prior art which relies on the special shape design of the pawl (i.e. the locking pawl 12 of the present invention) and the technical solution that realizes the function of cutting off the clutch and the main shaft 2 under the action of the inertia force of other components of the pawl, thereby avoiding the overshoot phenomenon, the structural design of the cutting part, pawl 15 and ratchet ring 16, firstly, has no special requirements on the shape of the locking pawl 12, and secondly, does not rely on inertia force to drive, but relies on the stroke design of the pawl 15 and the ratchet ring 16 to drive the power cutting part 14 to work, which not only reduces the processing difficulty of the locking pawl 12, but also improves the processing qualification rate of the locking pawl 12; at the same time, the working reliability is also improved.

[0055] In another embodiment, see Figure 3 The input part 11 includes a turbine 111 and a drive plate 112; the turbine 111 is a worm gear structure, which is a common structure of this type of clutch input part 11 and will not be described in detail here.

[0056] like Figure 6 , Figure 7 , Fig. 9 and Fig.10 As shown, it needs to be described in detail that a disc groove 113 is formed on the turbine 111 , and the driving disc 112 is installed in the disc groove 113 .

[0057] When the gunpowder preload assembly 4 is not started, the drive disc 112 rotates within the disc groove 113 to a limited extent, and drives the locking claw 12 to extend out of the inner wall of the turbine 111 and engage with the locking wheel 13, so that the locking claw 12 transmits the power of the turbine 111 to the main shaft 2.

[0058] Alternatively, when the gunpowder preload assembly 4 is started, the locking claw 12 retracts into the turbine 111, disengages from the locking wheel 13, thereby cutting off the power connection between the turbine 111 and the main shaft 2, and the drive disk 112 is fixed in the disk groove 113, and the locking claw 12 no longer extends outward, completely cutting off the power connection between the turbine 111 and the main shaft 2.

[0059] To realize this function, the structure of the power cut-off unit 14 is described in detail. The power cut-off unit 14 includes:

[0060] like Figure 6 and Fig. 9 The limiting groove 141 shown is formed on the driving disk 112 .

[0061] like Figure 6 and Fig. 9 The elastic arm 142 shown is disposed on one side of the limiting groove 141 .

[0062] like Figure 6 and Fig. 9 The limiting sliding groove 143 shown is formed by the elastic arm 142 and the inner wall of the disc groove 113 .

[0063] like Figure 6 and Fig. 9 The limiting boss 144 shown is fixedly connected in the disc slot 113 .

[0064] When the gunpowder pre-tightening assembly 4 is not started, the limiting boss 144 is located in the limiting sliding groove 143 ; the limiting boss 144 serves to limit the rotation range of the driving disk 112 in the disk groove 113 .

[0065] When the gunpowder preload assembly 4 is started, the limiting boss 144 disengages from the limiting slide groove 143, enters the limiting groove 141, and is rigidly connected to the limiting groove 141, thereby fixing the drive disk 112 in the disk groove 113, and making the locking claw 12 no longer extend outward, completely cutting off the power connection between the turbine 111 and the main shaft 2.

[0066] In another embodiment, see Figure 2 and Figure 3A hinge column 121 is fixedly connected to the locking claw 12, and a sliding groove is provided on the driving disk 112, and the hinge column 121 is installed in the sliding groove; the driving disk 112 rotates to drive the hinge column 121 to slide in the sliding groove, and the sliding of the hinge column 121 drives the locking claw 12 to extend outward or retract out of the inner wall of the turbine 111; this embodiment provides a structural form in which the locking claw 12 is movably supported between an initial position and an engagement position of the input part 11 (here, between the turbine 111 and the driving disk 112), and the sliding groove is directly provided on the driving disk 112, and the hinge column 121 is fixedly connected to the locking claw 12, and the structure is simple, and no other components need to be added.

[0067] In another embodiment, see Figure 3 and Figure 6 The driving disk 112 is fixed with a positioning pin 115, and the ratchet ring 16 is provided with a positioning groove 161. When the gunpowder pre-tightening assembly 4 is not started, the positioning pin 115 and the positioning groove 161 are fixedly connected to fix the ratchet ring 16 on the driving disk 112; when the gunpowder pre-tightening assembly 4 is started, the ratchet ring 16 continues to rotate, cutting off the positioning pin 115, so that the ratchet ring 16 is separated from the circumferential connection with the driving disk 112, that is, the input part 11, that is, the reverse power of the main shaft 2 will no longer be transmitted to the driving disk 112 through the ratchet ring 16, thereby preventing the limiting boss 144 and the limiting groove 141 from being separated from the rigid connection.

[0068] In another embodiment, see Figure 4 , Figure 5 and Figure 8 , also includes an elastic fixing member 17, and a pawl groove 21 is provided on the main shaft 2; when the gunpowder pre-tightening assembly 4 is not started, the elastic fixing member 17 fixes the pawl 15 in the pawl groove 21; when the gunpowder pre-tightening assembly 4 is started, the pawl 15 generates centrifugal force as the main shaft 2 rotates in the reverse direction, and breaks away from the constraint of the elastic fixing member 17, and the claw end of the pawl 15 breaks away from the pawl groove 21 and meshes with the ratchet ring 16 to drive the ratchet ring 16 to rotate; after the pre-tightening of the gunpowder pre-tightening assembly 4 is completed, the pawl 15 generates centripetal force as the main shaft 2 rotates forward, and the pawl 15 returns to the pawl groove 21, and the claw end of the pawl 15 is disengaged from the ratchet ring 16; the design of the elastic fixing member 17 prevents the pawl 15 from extending under other working conditions such as falling.

[0069] In another embodiment, see Figure 4 and Figure 5, the elastic fixing member 17 is an arc spring; when the gunpowder pre-tightening assembly 4 is not started, one end of the arc spring is connected to the pawl 15, and the other end is connected to the main shaft 2; or, the elastic fixing member 17 is a compression spring; when the gunpowder pre-tightening assembly 4 is not started, the compression spring presses the pawl 15 into the pawl groove 21; or the elastic fixing member 17 can also be a spring sheet, which will not be repeated here.

[0070] In other embodiments, Figure 4 As shown, the pawl 15 can be a single pawl 15 or multiple pawls 15, which will not be described in detail here. Designers can design it according to actual vehicle conditions.

[0071] In summary, the structural design of the power cut-off part 14, the pawl 15 and the ratchet ring 16 circumferentially fixed on the input part 11 of the present invention is that when the car does not collide and the gunpowder pre-tightening component 4 is not started, the pawl 15 of the above design is located at the initial position of the main shaft 2 and is not connected to the ring gear, and the locking pawl 12 couples the input part 11 and the locking wheel 13 together, so that the input part 11 can rotate forward with the main shaft 2; when the car collides and the gunpowder pre-tightening component 4 is started, the force generated by the gunpowder drives the main shaft 2 to reverse, and the pawl 15 at the initial position of the main shaft 2 reverses with the main shaft 2, thereby generating centrifugal force, and the centrifugal force drives the pawl 15 to move to the engaging position of the main shaft 2, and the pawl 15 and the ratchet ring 16 are meshed, that is, the main shaft 2 and the ratchet ring 16 are coupled; the reversal of the main shaft 2 also reverses the ratchet ring 16 at the same time, and the reversal of the ratchet ring 16 drives the power cut-off part 14 to fix the locking pawl 12 to The initial position of the input part 11 is set, thereby cutting off the power connection between the input part 11 and the main shaft 2; after the pre-tightening of the gunpowder pre-tightening assembly 4 is completed, the pawl 15 returns to the initial position of the main shaft 2 with the forward rotation of the main shaft 2, and can no longer drive the ratchet 16 to rotate, and finally completely cuts off the power connection between the input part 11 and the main shaft 2; compared with the technical solution of the prior art that relies on the special shape design of the pawl (i.e., the locking pawl 12 of the present invention) and the pawl under the action of the inertia force of other components to achieve the function of cutting off the clutch and the main shaft 2, thereby avoiding the overshoot phenomenon, the structural design of the cutting part, the pawl 15 and the ratchet 16, on the one hand, has no special requirements on the shape of the locking pawl 12, and on the other hand, does not rely on the inertia force to drive, but relies on the stroke design of the pawl 15 and the ratchet 16 to drive the power cutting part 14 to work, which not only reduces the processing difficulty of the locking pawl 12, but also improves the processing qualification rate of the locking pawl 12; at the same time, the working reliability is also improved. Therefore, the present invention effectively overcomes the shortcomings of the prior art and has a high industrial utilization value.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A clutch device for a pre-tensioned seat belt retractor for an automobile, which transmits the power of the electric component of the retractor to the main shaft, and cuts off the power connection between the electric component and the main shaft when the gunpowder pre-tensioning component is started; The invention comprises an input part, a locking pawl and a locking wheel circumferentially fixed on the main shaft; the locking pawl is movably supported between an initial position and an engagement position of the input part, and couples the input part to the locking wheel at the engagement position of the input part; Features: It also includes a power cut-off portion, a ratchet pawl, and a ratchet ring circumferentially fixed on the input portion; When the gunpowder preload assembly is not activated, the ratchet is located at the initial position of the main shaft; When the gunpowder preload assembly is started, the ratchet moves to the engaging position of the main shaft and couples the main shaft to the ratchet ring; the ratchet ring drives the power cut-off part to fix the locking pawl at the initial position of the input part; After the pre-tightening of the gunpowder pre-tightening assembly is completed, the ratchet pawl returns to the initial position of the main shaft.

2. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 1, characterized in that: The input part includes a turbine and a drive disc; The turbine is provided with a disc groove, and the driving disc is installed in the disc groove; When the gunpowder preload assembly is not started, the drive disc rotates within the disc groove to a limited extent, and drives the locking claw to extend out of the inner wall of the turbine to engage with the locking wheel, or retract into the turbine to disengage from the locking wheel; When the gunpowder pre-tensioning assembly is started, the driving disc is fixed in the disc groove, and the locking claw is retracted into the turbine to disengage from the locking wheel.

3. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 2, characterized in that: The power cut-off unit comprises: A limiting groove is provided on the driving disc; An elastic arm is arranged on one side of the limiting groove; A limiting sliding groove, formed by the elastic arm and the inner wall of the disc groove; A limiting boss, fixedly connected in the disc slot; When the gunpowder pre-tightening assembly is not activated, the limiting boss is located in the limiting slide groove; When the gunpowder pre-tightening assembly is started, the limiting boss is separated from the limiting slide groove, enters the limiting groove, and is rigidly connected to the limiting groove, and the driving disc is fixed in the disc groove.

4. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 2, characterized in that: The locking claw is fixedly connected with a hinge column, the driving plate is provided with a slide groove, and the hinge column is installed in the slide groove; The rotation of the driving plate drives the hinge column to slide in the sliding groove, and the sliding of the hinge column drives the locking claw to extend outward or retract out of the inner wall of the turbine.

5. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 2, characterized in that: A positioning pin is fixedly connected to the driving disc, and a positioning groove is provided on the ratchet ring; When the gunpowder pre-tightening assembly is not activated, the positioning pin and the positioning groove are fixedly connected to fix the ratchet ring on the driving disk; When the gunpowder pre-tightening assembly is started, the ratchet ring rotates continuously to shear off the positioning pin.

6. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 1, characterized in that: It also includes an elastic fixing member, and a ratchet groove is provided on the main shaft; When the gunpowder preload assembly is not activated, the elastic fixing member fixes the pawl in the pawl groove; When the gunpowder preload assembly is started, the pawl generates centrifugal force as the main shaft reverses, and is freed from the constraint of the elastic fixing member. The claw end of the pawl is freed from the pawl groove and meshes with the ratchet ring, driving the ratchet ring to rotate; After the pre-tightening of the gunpowder pre-tightening assembly is completed, the pawl generates a centripetal force as the main shaft rotates forward, the pawl returns to the pawl groove, and the claw end of the pawl is disengaged from the ratchet ring.

7. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 6, characterized in that: The elastic fixing member is an arc spring; When the gunpowder preload assembly is not activated, one end of the arc spring is connected to the pawl, and the other end is connected to the main shaft.

8. The clutch device of the automobile pre-tensioning seat belt retractor according to claim 6, characterized in that: The elastic fixing member is a compression spring; When the gunpowder preload assembly is not activated, the compression spring presses the pawl into the pawl groove.

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