Adjusting mechanism for pressing force of upper column tube and lower protective tube of automobile steering wheel

Abstract

The utility model discloses a pressing force adjusting mechanism for an upper column pipe and a lower protective pipe of an automobile steering wheel, an upper die can be positioned right above a lower die in a lifting motion manner, a pipe fitting accommodating groove for vertically placing a pipe fitting is formed in the lower die, and a holding slide block can be mounted on the lower die in a manner of sliding along the radial direction of the pipe fitting accommodating groove in the horizontal direction; the enclasping driving device can drive the enclasping sliding blocks to slide in the axis direction of the pipe fitting containing groove, the at least two enclasping sliding blocks can abut against the outer side surface of the circumference of the pipe fitting inserted into the pipe fitting containing groove in different directions so that the pipe fitting can be positioned, and the core rod fixed to the lower side of the upper die can be inserted into the inner side of the fixed and positioned pipe fitting along with descending of the lower die. According to the pipe fitting inner convex hull shaping device, the convex hulls in the pipe fitting are shaped, the heights of all the convex hulls on the pipe fitting are consistent, the bottom faces of the convex hulls are planes, and it is guaranteed that the pressing force of an upper column pipe and a lower protection pipe of an automobile steering wheel is within the specified range.

Description

Technical Field

[0001] The utility model relates to a shaping mechanism, in particular to a pressing force adjusting mechanism for an upper column tube and a lower guard tube of an automobile steering wheel. Background Art

[0002] When assembling the upper column tube and the lower guard tube of an automobile steering wheel, multiple inwardly protruding bumps and inwardly concave pits on their side walls are relied on for cooperation to achieve pre-positioning of pressing. After the assembly of the upper column tube and the lower guard tube of the automobile steering wheel is completed, the required pressing force range for the cooperation between the bumps and the pits is 2200 - 2600 N. However, considering the influence of welding deformation, the required pressing force for a single stamping part is generally tightened to the range of 2300 - 2500 N. This range cannot be met only by stamping forming. Therefore, it is necessary to shape the bumps and pits formed by stamping on the side walls of the upper column tube and the lower guard tube of the automobile steering wheel so that the inner heights of all the bumps are the same and the bottom surfaces are flat. Content of the Utility Model

[0003] In order to overcome the above defects, the utility model provides a pressing force adjusting mechanism for an upper column tube and a lower guard tube of an automobile steering wheel. Through this pressing force adjusting mechanism for an upper column tube and a lower guard tube of an automobile steering wheel, the bumps on the side walls of the upper column tube and the lower guard tube of the automobile steering wheel can be shaped, so as to achieve the effect of adjusting the pressing force between the upper column tube and the lower guard tube of the automobile steering wheel and make it meet the requirements.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a pressing force adjusting mechanism for an upper column tube and a lower guard tube of an automobile steering wheel, including an upper die, a lower die, a mandrel, a clamping slider and a clamping driving device. The upper die is located directly above the lower die and can move up and down. A pipe fitting accommodating groove for vertically placing a pipe fitting is provided on the lower die. The clamping slider is installed on the lower die and can slide radially along the pipe fitting accommodating groove in the horizontal direction. The clamping driving device can drive the clamping slider to slide towards the axis direction of the pipe fitting accommodating groove. At least two clamping sliders can tightly abut against the outer circumferential surface of the pipe fitting inserted into the pipe fitting accommodating groove in different directions to fix and position the pipe fitting. The mandrel is fixedly installed on the lower side of the upper die, and the mandrel can be inserted into the inner side of the fixed and positioned pipe fitting as the lower die descends. The outer circumferential surface of the mandrel can be in close contact with the bumps on the inner side wall of the pipe fitting, so as to trim the bumps on the inner side wall of the pipe fitting.

[0005] As a further improvement of the utility model, the lower end of the mandrel forms a tapered structure with a shrinking size.

[0006] As a further improvement of the present invention, the clamping drive device is a plunger fixedly arranged on the lower side of the upper die, a first inclined surface is formed on the side wall of the lower end of the plunger, and a second inclined surface is provided on the clamping slider. When the plunger is moved down with the upper die, the first inclined surface contacts the second inclined surface to force the clamping slider to slide horizontally toward the pipe fitting. A reset elastic member is also provided on the lower die, and the reset elastic member provides an elastic retaining force for the clamping slider to slide in the direction away from the pipe fitting.

[0007] As a further improvement of the present invention, the clamping slider is also provided with a guide slot extending radially along the pipe accommodating groove, and a limiting protrusion is fixedly installed on the lower mold. The limiting protrusion is inserted in the guide slot, and the limiting protrusion can slide relative to the guide slot radially along the pipe accommodating groove.

[0008] As a further improvement of the utility model, the lower mold includes a lower mold plate, a lower mold base, a lower mold pad and a lower mold support block, the lower mold pad is fixedly arranged on the upper side of the lower mold base, the lower mold plate is fixedly arranged on the lower mold pad, the lower mold support block is fixedly arranged on the lower mold base, the upper mold plate is provided with a through hole for the pipe fitting to pass through, the lower mold support block is located directly below the through hole, the lower end of the pipe fitting can be supported on the upper surface of the lower mold support block, and the through hole and the lower mold support block together form a pipe fitting accommodating groove.

[0009] As a further improvement of the utility model, a guide seat and a limit seat are fixedly provided on the lower template, and a slideway extending radially along the pipe accommodating groove is formed on the guide seat, and the clamping slider is slidably arranged in the slideway, and the limit seat is located on the side of the guide seat facing away from the pipe accommodating groove, and a countersunk through hole extending radially along the pipe accommodating groove is provided in the limit seat, and a limit bolt is slidably provided in the countersunk through hole, and the stud of the limit bolt is threadedly connected to the clamping slider, and the reset elastic member is a spring sleeved on the outside of the limit bolt, one end of the spring is tightly against the head of the limit bolt, and the other end of the spring is tightly against the countersunk bottom surface of the countersunk through hole.

[0010] As a further improvement of the utility model, a wear-resistant block is fixedly provided on the side wall of the limit seat facing the guide seat, and a gap for inserting a knife is formed between the wear-resistant block and the clamping slider. The edge of the upper end of the wear-resistant block facing the clamping slider is a rounded structure or a chamfered structure.

[0011] As a further improvement of the present invention, a clamping surface matching the outer shape of the pipe is formed on the side wall of the clamping slider facing the axial direction of the pipe accommodating groove, and the clamping surface can fit tightly on the circumferential outer wall of the pipe.

[0012] As a further improvement of the utility model, a pipe fitting edge pressing stopper is also fixedly arranged on the clamping slider. When the clamping slider clamps the circumferential outer side wall of the pipe fitting, the pipe fitting edge pressing stopper stops on the upper end face of the pipe fitting. When the clamping slider resets and disengages from the pipe fitting, the pipe fitting edge pressing stopper also disengages from the upper end of the pipe fitting.

[0013] As a further improvement of the utility model, a mandrel limiting block is also fixedly arranged on the upper die. A mandrel insertion hole with an inner diameter larger at the upper end than at the lower end is formed in the mandrel limiting block. A radially outward expanding convex platform is formed at the upper end of the mandrel. The mandrel is inserted into the mandrel insertion hole of the mandrel limiting block, and the radially outward expanding convex platform at the upper end of the mandrel is accommodated in the part with a larger diameter of the mandrel insertion hole. The lower end face of the radially outward expanding convex platform at the upper end abuts against the step surface between the two ends of the mandrel insertion hole. A limiting groove facing the pipe fitting edge pressing stopper is also arranged at the lower end of the mandrel limiting block. After the upper die descends to the set height, the pipe fitting edge pressing stopper stopping on the upper end of the pipe fitting can be inserted into the limiting groove.

[0014] The beneficial effects of the utility model are as follows: The utility model horizontally slides the clamping slider to clamp the pipe fitting pre-positioned on the lower die, and then inserts the mandrel on the upper die into the pipe fitting. The convex hull formed on the inner side wall of the pipe fitting by stamping is shaped by using the circumferential outer side wall of the mandrel, so that the heights of all convex hulls on the pipe fitting are the same, and the bottom surface of the convex hull is a plane. While the convex hull is being shaped, the concave pits formed on the circumferential outer side wall of the pipe fitting are also shaped, and their depths are also the same, and the bottom surface is a plane. After shaping, it can ensure that the pressing force between the upper column pipe and the lower guard pipe of the automotive steering wheel is within the specified range. Description of the Drawings

[0015] Figure 1 is the front view of the pipe fitting;

[0016] Figure 2 is the right view of the pipe fitting;

[0017] Figure 3 is the main view of the structural principle of the utility model;

[0018] Figure 4 is the top view of the structural principle of the utility model;

[0019] Figure 5 is the right view of the structural principle of the utility model. Detailed Embodiment

[0020] Embodiment: A pressing force adjusting mechanism for the upper column tube and lower guard tube of an automotive steering wheel, comprising an upper die 1, a lower die, a mandrel 2, a clamping slider 3 and a clamping driving device. The upper die 1 is located directly above the lower die and can move up and down. The lower die is provided with a receiving groove for the pipe fitting 4 to be placed vertically. The clamping slider 3 is installed on the lower die and can slide radially along the receiving groove of the pipe fitting 4 in the horizontal direction. The clamping driving device can drive the clamping slider 3 to slide towards the axis direction of the receiving groove of the pipe fitting 4. At least two clamping sliders 3 can tightly abut against the outer circumferential surface of the pipe fitting 4 inserted into the receiving groove of the pipe fitting 4 in different directions, so that the pipe fitting 4 is fixedly positioned. The mandrel 2 is fixedly installed on the lower side of the upper die 1, and the mandrel 2 can be inserted into the inside of the fixedly positioned pipe fitting 4 as the lower die descends. The outer circumferential surface of the mandrel 2 can be in close contact with the convex bump 41 on the inner side wall of the pipe fitting 4, so as to trim the convex bump 41 on the inner side wall of the pipe fitting 4.

[0021] During production, the pipe fitting 4 is inserted into the receiving groove of the pipe fitting 4 of the lower die for preliminary positioning, and then the clamping slider 3 slides horizontally to clamp the outer circumferential wall of the pipe fitting 4 to realize the fixed positioning of the pipe fitting 4. As the upper die 1 descends and the mandrel 2 is inserted into the pipe fitting 4, the outer circumferential surface of the mandrel 2 rubs and squeezes against the convex bump 41 protruding inward on the inner side wall of the pipe fitting 4, so that the convex bump 41 inside the pipe fitting 4 is extruded and shaped to a specified height. Furthermore, when it is assembled with the inner tube, the convex bump 41 protruding inward on it forms a perfect fit with the pit on the inner tube, ensuring that a pressing force meeting the requirements is formed between the two.

[0022] The lower end of the mandrel 2 forms a tapered structure with a reduced size. This avoids interference between the mandrel 2 and the side wall of the pipe fitting 4 when the mandrel 2 is inserted into the pipe fitting 4 and causing damage to the pipe fitting 4. The edge of the lower end of the tapered structure is preferably designed as a chamfered structure or a rounded structure.

[0023] The clamping driving device is an inserting knife 5 fixedly arranged on the lower side of the upper die 1. A first inclined surface 51 is formed on the side wall of the lower end of the inserting knife 5, and a second inclined surface 31 is provided on the clamping slider 3. During the process of the inserting knife 5 descending with the upper die 1, the first inclined surface 51 contacts the second inclined surface 31, forcing the clamping slider 3 to slide horizontally towards the pipe fitting 4. A reset elastic member is also arranged on the lower die, and the reset elastic member provides an elastic holding force for the clamping slider 3 to slide away from the pipe fitting 4.

[0024] The inserting knife 5 descends synchronously with the upper die 1. The first inclined surface 51 of the inserting knife 5 contacts the second inclined surface 31 of the clamping slider 3, forcing the clamping slider 3 to slide horizontally towards the pipe fitting 4 and finally clamping the pipe fitting 4. Preferably, a vertical surface is formed on the inserting knife 5 that is connected to the first inclined surface 51, and a vertical surface is provided on the clamping slider 3 that is connected to the second inclined surface 31. When the upper die 1 descends to a certain height, the first inclined surface 51 and the second inclined surface 31 are disengaged, and the vertical surface on the inserting knife 5 contacts the vertical surface on the clamping slider 3 to realize the stable positioning of the clamping slider 3.

[0025] The holding slider 3 is further provided with a guiding chute 32 extending radially along the accommodating groove of the pipe fitting 4. A limiting lug 621 is fixedly installed on the lower die, and the limiting lug 621 is inserted into the guiding chute 32, and the limiting lug 621 can slide relative to the guiding chute 32 along the radial direction of the accommodating groove of the pipe fitting 4. The limiting lug 621 slides in the guiding chute 32 to limit the sliding distance of the holding slider 3, preventing it from sliding outside the sliding insert 5 and causing the insert 5 to be unable to be inserted smoothly.

[0026] The lower die includes a lower template 6, a lower die base 7, a lower die spacer 8 and a lower die support block 9. The lower die spacer 8 is fixedly arranged on the upper side of the lower die base 7, the lower template 6 is fixedly arranged on the lower die spacer 8, the lower die support block 9 is fixedly arranged on the lower die base 7. An aperture 61 for the pipe fitting 4 to pass through is arranged on the upper die 1 plate. The lower die support block 9 is located directly below the aperture 61, and the lower end of the pipe fitting 4 can be supported on the upper surface of the lower die support block 9. The aperture 61 and the lower die support block 9 together form an accommodating groove for the pipe fitting 4. When positioning the pipe fitting 4, it is first inserted into the aperture 61 of the lower template 6, and the lower end face of the pipe fitting 4 is supported on the lower die support block 9. The height of the lower die support block 9 can be adjusted according to the length specification of the pipe fitting 4.

[0027] The lower template 6 is further fixedly provided with a guiding seat 62 and a limiting seat 63. A slideway extending radially along the accommodating groove of the pipe fitting 4 is formed on the guiding seat 62. The holding slider 3 is slidably arranged in the slideway. The limiting seat 63 is located on the side of the guiding seat 62 facing away from the accommodating groove of the pipe fitting 4. A countersunk perforation 631 extending radially along the accommodating groove of the pipe fitting 4 is arranged in the limiting seat 63. A limiting bolt 632 is slidably arranged in the countersunk perforation 631. The stud of the limiting bolt 632 is screwed to the holding slider 3. The reset elastic member is a spring sleeved outside the limiting bolt 632. One end of the spring abuts against the head of the limiting bolt 632, and the other end of the spring abuts against the countersunk bottom surface of the countersunk perforation 631. The slideway on the guiding seat 62 can guide the sliding of the holding slider 3, and the limiting seat 63 pulls the holding slider 3 through the limiting bolt 632 to realize the reset of the holding slider 3 under the action of the spring.

[0028] A wear-resistant block 633 is further fixedly arranged on the side wall of the limiting seat 63 facing the guiding seat 62. A gap for the insert 5 to insert is formed jointly between the wear-resistant block 633 and the holding slider 3. The upper end of the wear-resistant block 633 is a rounded corner structure or a chamfer structure on the side edge facing the holding slider 3. When the insert 5 descends, the rounded corner or chamfer structure on the wear-resistant block 633 can realize avoidance and guiding, and the side wall of the insert 5 is supported by the wear-resistant block 633 to ensure the stable clamping of the pipe fitting 4 by the holding slider 3.

[0029] On the side wall of the clamping slider 3 facing the axis direction of the receiving groove of the pipe fitting 4, a clamping surface matching the outer shape of the pipe fitting 4 is formed, and the clamping surface can closely adhere to the outer circumferential side wall of the pipe fitting 4.

[0030] A pipe fitting edge pressing stopper 33 is also fixedly arranged on the clamping slider 3. When the clamping slider 3 clamps the outer circumferential side wall of the pipe fitting 4, the pipe fitting edge pressing stopper 33 stops against the upper end surface of the pipe fitting 4. When the clamping slider 3 resets and disengages from the pipe fitting 4, the pipe fitting edge pressing stopper 33 also disengages from the upper end of the pipe fitting 4. The edge pressing stopper can block the upper end surface of the pipe fitting 4, and prevent the pipe fitting 4 from rising together with the mandrel 2 during mold opening, so as to achieve the demolding effect.

[0031] A mandrel limiting block 10 is also fixedly arranged on the upper mold 1. A mandrel 2 insertion hole with an inner diameter larger at the upper end than at the lower end is formed in the mandrel limiting block 10. A radially outward expanding boss is formed at the upper end of the mandrel 2. The mandrel 2 is inserted into the mandrel 2 insertion hole of the mandrel limiting block 10, and the radially outward expanding boss at the upper end of the mandrel 2 is accommodated in the part with a larger diameter of the mandrel 2 insertion hole. The lower end surface of the radially outward expanding boss at the upper end abuts against the step surface between the two ends of the mandrel 2 insertion hole. A limiting groove facing the pipe fitting edge pressing stopper 33 is also arranged at the lower end of the mandrel limiting block 10. After the upper mold 1 descends to the set height, the pipe fitting edge pressing stopper 33 stopping against the upper end of the pipe fitting 4 can be inserted into the limiting groove. When the upper mold 1 descends to close the mold, the edge pressing stopper is further limited by the limiting groove on the mandrel 2 positioning block of the upper mold 1, so as to further improve the stability of the clamping and positioning of the clamping slider 3 on the pipe fitting 4.

Claims

1. A pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel, characterized in that: The invention comprises an upper die (1), a lower die, a core rod (2), a clamping slider (3) and a clamping drive device. The upper die can be lifted and lowered and is located directly above the lower die. The lower die is provided with a pipe receiving groove for vertically placing the pipe (4). The clamping slider can be installed on the lower die and can slide radially along the pipe receiving groove in the horizontal direction. The clamping drive device can drive the clamping slider to slide in the direction of the axis of the pipe receiving groove. At least two clamping sliders can press against the outer circumferential surface of the pipe inserted in the pipe receiving groove in different directions so that the pipe is fixed in position. The core rod is fixedly installed on the lower side of the upper die. The core rod can be inserted into the inner side of the fixedly positioned pipe as the lower die descends. The outer circumferential surface of the core rod can be in close contact with the convex bump (41) on the inner wall of the pipe, thereby trimming the convex bump on the inner wall of the pipe.

2. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 1, wherein: The lower end of the core rod forms a tapered structure with a reduced size.

3. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 1, wherein: The clamping drive device is a plunger (5) fixedly arranged on the lower side of the upper die, a first inclined surface (51) is formed on the side wall of the lower end of the plunger, and a second inclined surface (31) is provided on the clamping slider. When the plunger is moved down with the upper die, the first inclined surface contacts the second inclined surface to force the clamping slider to slide horizontally toward the pipe fitting. A reset elastic member is also provided on the lower die, and the reset elastic member provides an elastic retaining force for the clamping slider to slide in a direction away from the pipe fitting.

4. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 3, characterized in that: The clamping slide block is also provided with a guide slot (32) extending radially along the pipe receiving slot, and a limiting protrusion (621) is fixedly installed on the lower die, the limiting protrusion is inserted in the guide slot, and the limiting protrusion can slide relative to the guide slot along the radial direction of the pipe receiving slot.

5. The pressing force adjusting mechanism for the upper column tube and lower guard tube of an automobile steering wheel according to claim 3, characterized in that: The lower die comprises a lower die plate (6), a lower die base (7), a lower die cushion block (8) and a lower die support block (9); the lower die cushion block is fixedly arranged on the upper side of the lower die base; the lower die plate is fixedly arranged on the lower die cushion block; the lower die support block is fixedly arranged on the lower die base; a through hole (61) for the pipe fitting to pass through is arranged on the upper die plate; the lower die support block is located directly below the through hole; the lower end of the pipe fitting can be supported on the upper surface of the lower die support block; the through hole and the lower die support block together form a pipe fitting accommodating groove.

6. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 5, characterized in that: The lower template is also fixedly provided with a guide seat (62) and a limit seat (63), the guide seat is formed with a slideway extending radially along the pipe receiving groove, the clamping slider is slidably arranged in the slideway, the limit seat is located on the side of the guide seat facing away from the pipe receiving groove, the limit seat is provided with a countersunk through hole (631) extending radially along the pipe receiving groove, a limit bolt (632) is slidably arranged in the countersunk through hole, the stud of the limit bolt is threadedly connected to the clamping slider, the reset elastic member is a spring sleeved on the outside of the limit bolt, one end of the spring is tightly against the head of the limit bolt, and the other end of the spring is tightly against the bottom surface of the countersunk through hole.

7. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 6, characterized in that: A wear-resistant block (633) is also fixedly provided on the side wall of the limit seat facing the guide seat, and a gap for inserting a knife is formed between the wear-resistant block and the clamping slider. The edge of the upper end of the wear-resistant block facing the clamping slider is a rounded structure or a chamfered structure.

8. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 1, characterized in that: On the side wall of the clamping slider facing the axis direction of the pipe fitting accommodating groove, a clamping surface matching the outer shape of the pipe fitting is formed, and the clamping surface can be closely attached to the outer circumferential side wall of the pipe fitting.

9. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 1, wherein: A pipe fitting edge pressing stopper (33) is also fixedly arranged on the clamping slider. When the clamping slider clamps the outer circumferential side wall of the pipe fitting, the pipe fitting edge pressing stopper stops on the upper end surface of the pipe fitting. When the clamping slider resets and disengages from the pipe fitting, the pipe fitting edge pressing stopper also disengages from the upper end of the pipe fitting.

10. The pressing force adjusting mechanism for the upper column tube and the lower guard tube of an automobile steering wheel according to claim 9, characterized in that: A mandrel limiting block (10) is also fixedly arranged on the upper die. A mandrel insertion hole with an inner diameter larger at the upper end than at the lower end is formed in the mandrel limiting block. A radially outward expanding convex platform is formed at the upper end of the mandrel. The mandrel is inserted into the mandrel insertion hole of the mandrel limiting block, and the radially outward expanding convex platform at the upper end of the mandrel is accommodated in the part of the mandrel insertion hole with a larger diameter. The lower end surface of the radially outward expanding convex platform at the upper end abuts against the step surface between the two ends of the mandrel insertion hole. A limiting groove facing the pipe fitting edge pressing stopper is also arranged at the lower end of the mandrel limiting block. After the upper die descends to the set height, the pipe fitting edge pressing stopper stopping on the upper end of the pipe fitting can be inserted into the limiting groove.

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