A C-EPS core shaft assembly mechanism and a clearance adjustment method thereof

Abstract

The present invention proposes a C-EPS core shaft assembly mechanism, wherein the steering assembly is provided with a shaft sleeve, a worm gear sleeved on the shaft sleeve, a support seat sleeved on the shaft sleeve and a torsion bar inserted in the shaft sleeve; the core shaft comprises a first section and a second section, a flange is formed at a protrusion at the connection between the first section and the second section, a stepped hole is opened at the center of the positioning ring, the positioning ring is sleeved on the core shaft and the flange is accommodated in the stepped hole; the middle valve body assembly is sleeved on the shaft sleeve and abuts against the worm gear, the front valve body assembly is sleeved on the shaft sleeve and is located on a side of the middle valve body assembly away from the worm gear, the first section of the core shaft is inserted in the shaft sleeve, the positioning ring is located on a side of the support seat away from the worm gear, and the torsion bar is inserted in the core shaft; the rear valve body assembly is sleeved on the core shaft and is located on a side of the support seat away from the worm gear, and the rear valve body assembly abuts against the positioning ring.

Description

[Technical field]

[0001] The invention relates to the technical field of automobile steering, and in particular to a C-EPS core shaft assembly mechanism and a gap adjustment method thereof. [Background technology]

[0002] The core shaft of the existing C-EPS (column-type electric power steering) is formed by inserting the core shaft into the lower steering core shaft assembly to form a workpiece, and then the workpiece is loaded into the rear valve body assembly, and the rear valve body assembly moves the workpiece to the middle valve body assembly and inserts it into the middle valve body assembly, and the middle valve body assembly automatically clamps the lower steering core shaft in the workpiece, and the rear valve body assembly, the middle valve body assembly and the workpiece move together into the front valve body assembly, and the front valve body assembly automatically clamps the lower steering spline. However, due to the consistency difference of the workpiece, when the core shaft is inserted into the steering assembly, the gap between the worm gear end face of the steering assembly and the middle valve body assembly is uncontrollable, which cannot meet the accuracy requirements of the core shaft assembly mechanism of C-EPS and is prone to cause product defects.

[0003] In view of this, it is necessary to provide a new type of C-EPS core shaft assembly mechanism and a gap adjustment method thereof to overcome the above-mentioned defects. [Summary of the invention]

[0004] The purpose of the present invention is to provide a C-EPS core shaft assembly mechanism, which can control the gap between the worm gear and the middle valve body assembly, meet the accuracy requirements of the C-EPS core shaft assembly mechanism, and avoid causing product defects.

[0005] In order to achieve the above-mentioned object, the present invention provides a C-EPS spindle assembly mechanism, including a steering assembly 1, a positioning ring 2, a spindle 3, a front valve body assembly 4, a middle valve body assembly 5 and a rear valve body assembly 6; the steering assembly 1 is provided with a sleeve 11, a worm gear 12 sleeved on the sleeve 11, a support seat 13 sleeved on the sleeve 11 and a torsion bar 14 inserted in the sleeve 11; the spindle 3 includes a first section 31 and a second section 32 connected to the first section 31, a flange 33 is formed at the connection between the first section 31 and the second section 32, a stepped hole 21 is opened at the center of the positioning ring 2, the positioning ring 2 is sleeved on the spindle 3 and the flange 33 is received in the stepped hole 21;

[0006] The middle valve body assembly 5 is sleeved on the shaft sleeve 11 and abuts against the worm gear 12, the front valve body assembly 4 is sleeved on the shaft sleeve 11 and is located on the side of the middle valve body assembly 5 away from the worm gear 12, the first section 31 of the core shaft 3 is inserted into the shaft sleeve 11, and the positioning ring 2 is located on the side of the support seat 13 away from the worm gear 12, and the torsion bar 14 is inserted into the core shaft 3; the rear valve body assembly 6 is sleeved on the core shaft 3 and is located on the side of the support seat 13 away from the worm gear 12, and the rear valve body assembly 6 abuts against the positioning ring 2.

[0007] Preferably, the stepped hole 21 includes a receiving section 211 and an over-axis section 212 connected to the receiving section 211, the size of the over-axis end 212 is smaller than the size of the receiving section 211, the depth of the receiving section 211 is 1.1 mm, the flange 33 is received in the stepped hole 21, and the connection between the over-axis section 212 and the receiving section 211 abuts against the flange 33.

[0008] Preferably, the core shaft 3 has a slot 30 , and the torsion bar 14 is inserted into the slot 30 of the core shaft 3 .

[0009] Preferably, a positioning groove 34 is provided at the connection between the flange 33 and the second section 32 , and the positioning ring 2 is installed at the positioning groove 34 .

[0010] Preferably, the core shaft 3 is provided with a pin hole 351 , and a pin 3511 penetrating the torsion bar 14 is arranged in the pin hole 351 .

[0011] Preferably, a top screw 22 is provided on the side wall of the positioning ring 2 .

[0012] Preferably, the middle valve body assembly 5 includes a middle valve body shell 51 and a first locking sleeve 52 accommodated in the middle valve body shell 51 .

[0013] Preferably, the rear valve body assembly 6 includes a rear valve body shell 61 and a second locking sleeve 62 accommodated in the rear valve body shell 61 .

[0014] Preferably, the front valve body assembly 4 includes a front valve body shell 41 and an elastic clamp 42 accommodated in the front valve body shell 41 .

[0015] A method for adjusting the gap of a core shaft assembly mechanism of a C-EPS comprises the following steps:

[0016] S1: Sleeve the positioning ring 2 on the core shaft 3, and accommodate the flange 33 in the receiving section 211 of the stepped hole 21, and tighten the top screw 22 in the side wall of the positioning ring 2 to fix the positioning ring 2 and the core shaft 3;

[0017] S2: insert the mandrel 3 fixed with the positioning ring 2 into the shaft sleeve 11 of the steering assembly 1, and the torsion bar 14 in the shaft sleeve 11 of the steering assembly 1 is inserted into the slot 30 of the mandrel 3, the positioning ring 2 is in contact with the support seat 13, and the worm gear 12 and the middle valve body assembly 5 are pulled toward the direction close to the front valve body assembly 4, and the rear valve body assembly 6 moves toward the front valve body assembly 4 and the rear shaft section 212 abuts against the flange 33;

[0018] S3: The rear valve body assembly 6 is sleeved on the core shaft 3, and the second locking sleeve 62 of the rear valve body assembly 6 is locked on the core shaft 3;

[0019] S4: Move the core shaft 3, and sleeve the middle valve body assembly 5 on the shaft sleeve 11, and sleeve the front valve body assembly 4 on the shaft sleeve 11. The elastic chuck 42 of the front valve body assembly 4 clamps the shaft sleeve 11, and the second locking sleeve 62 of the rear valve body assembly 6 clamps the core shaft 3 and makes the core shaft 3 and the middle valve body assembly 5 align along the central axis direction. The front valve body assembly 4 drives the steering assembly 1 to rotate and aligns with the core shaft 3 along the central axis direction. After the centering action is completed, the first locking sleeve 52 of the middle valve body assembly 5 is locked on the shaft sleeve 11, and the elastic chuck 42 of the front valve body assembly 4 releases the shaft sleeve 11;

[0020] S5: Move the core shaft through the middle valve body assembly 5 and the rear valve body assembly 6, drill a pin hole 351 on the core shaft 3 and install the pin 3511 in the pin hole 351;

[0021] S6: After the pin 3511 is installed, the first locking sleeve 52 of the middle valve body assembly 5 releases the shaft sleeve 11, and the second locking sleeve 62 of the rear valve body assembly 5 releases the core shaft 3, and the core shaft 3 is taken out.

[0022] Compared with the prior art, the C-EPS core shaft assembly mechanism provided by the present invention has the beneficial effect of: by setting a positioning ring at the flange of the core shaft and opening a stepped hole on the positioning ring to accurately limit the distance that the rear valve body assembly moves in the direction of the front valve body assembly, thereby controlling the gap between the worm gear and the middle valve body assembly, the accuracy requirements of the C-EPS core shaft assembly mechanism can be met, and the phenomenon of defective products can be avoided.

Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1This is an exploded view of the core shaft assembly mechanism of the C-EPS provided by the present invention.

[0025] Figure 2 for Figure 1 A cross-sectional view of the core shaft assembly mechanism of the C-EPS is shown.

[0026] Figure 3 for Figure 2 A cross-sectional view of the core shaft of the core shaft assembly mechanism of the C-EPS is shown.

[0027] Figure 4 for Figure 2 A cross-sectional view of the positioning sleeve of the core shaft assembly mechanism of the C-EPS is shown. [Specific implementation method]

[0028] In order to make the purpose, technical solution and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.

[0029] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be determined according to the specific circumstances.

[0031] In addition, the terms "first", "second", and "a" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "b" may explicitly or implicitly include one or more of the features. In addition, the meanings of "multiple" and "several" refer to two or more, unless otherwise clearly and specifically defined.

[0032] See also Figures 1 to 4The present invention provides a C-EPS spindle assembly mechanism, including a steering assembly 1, a positioning ring 2, a spindle 3, a front valve body assembly 4, a middle valve body assembly 5 and a rear valve body assembly 6; the steering assembly 1 is provided with a sleeve 11, a worm gear 12 sleeved on the sleeve 11, a support seat 13 sleeved on the sleeve 11 and a torsion bar 14 inserted in the sleeve 11;

[0033] The mandrel 3 includes a first section 31 and a second section 32 connected to the first section 31. A flange 33 is formed at the connection between the first section 31 and the second section 32. A stepped hole 21 is provided at the center of the positioning ring 2. The stepped hole 21 includes a receiving section 211 and an over-axis section 212 connected to the receiving section 211. The size of the over-axis end 212 is smaller than the size of the receiving section 211. The depth of the receiving section 211 is 1.1 mm. The positioning ring 2 is sleeved on the mandrel 3 and the flange 33 is received in the receiving section 211 of the stepped hole 21. The connection between the over-axis section 212 and the receiving section 211 abuts against the flange 33.

[0034] The middle valve body assembly 5 is sleeved on the shaft sleeve 11 and abutted against the worm gear 12, the front valve body assembly 4 is sleeved on the shaft sleeve 11 and located on the side of the middle valve body assembly 5 away from the worm gear 12, the first section 31 of the core shaft 3 is inserted into the shaft sleeve 11, and the positioning ring 2 is located on the side of the support seat 13 away from the worm gear 12, and the torsion bar 14 is inserted into the core shaft 3; the rear valve body assembly 6 is sleeved on the core shaft 3 and located on the side of the support seat 13 away from the worm gear 12, and the rear valve body assembly 6 and the positioning ring 2 abut against each other to limit the rear valve body assembly 6.

[0035] Furthermore, the core shaft 3 has a slot 30 , and the torsion bar 14 is inserted into the slot 30 of the core shaft 3 .

[0036] Furthermore, a positioning groove 34 surrounding the core shaft 3 is formed at the connection between the flange 33 and the second section 32 , and the positioning ring 2 is installed in the positioning groove 34 .

[0037] Furthermore, the mandrel 3 further includes a third section 35 and a fourth section 36; the third section 35 is connected to one end of the second section 32 away from the first section 31, the fourth section 36 is connected to one end of the third section 35 away from the second section 32, and the slot 31 extends from the first section 31 to the fourth section 36. Specifically, the first section 31 is inserted into the sleeve 11, and the diameter of the second section 32 is larger than the diameter of the first section 31; the diameter of the third section 35 is smaller than the diameter of the second section 32, and the diameter of the third section 35 is larger than the diameter of the fourth section 36.

[0038] Furthermore, the third section 35 of the core shaft 3 is provided with a pin hole 351 , and a pin 3511 penetrating the torsion bar 14 is arranged in the pin hole 351 .

[0039] Furthermore, a top screw 22 is provided on the side wall of the positioning ring 2. When the positioning ring 2 is sleeved on the core shaft 3 and the flange 33 is received in the receiving section 211 of the stepped hole 21, the positioning ring 2 is firmly fixed on the core shaft 3 by rotating the top screw 22.

[0040] Further, the middle valve body assembly 5 includes a middle valve body housing 51 and a first locking sleeve 52 accommodated in the middle valve body housing 51. In this embodiment, the first locking sleeve 52 can be a quick connector. When the middle valve body assembly 5 is sleeved on the shaft sleeve 11 and abuts against the worm gear 12, the first locking sleeve 52 can be locked with the shaft sleeve 11.

[0041] Furthermore, the rear valve body assembly 6 includes a rear valve body housing 61 and a second locking sleeve 62 accommodated in the rear valve body housing 61. When the rear valve body assembly 6 is sleeved on the core shaft 3 and located on the side of the worm gear 12 away from the middle valve body assembly 5, the second locking sleeve 62 can be locked with the second section 32 of the core shaft 3.

[0042] Furthermore, the front valve body assembly 4 includes a front valve body housing 41 and an elastic chuck 42 received in the front valve body housing 41. When the front valve body assembly 4 is sleeved on the shaft sleeve 11 and located on the side of the middle valve body assembly 5 away from the worm gear 12, the core shaft 3 extends into the elastic chuck 42.

[0043] The present invention also provides a method for adjusting the gap of a core shaft assembly mechanism of a C-EPS, comprising the following steps:

[0044] S1: Sleeve the positioning ring 2 on the core shaft 3, and accommodate the flange 33 in the receiving section 211 of the stepped hole 21, and tighten the top screw 22 in the side wall of the positioning ring 2 with a hexagonal wrench to fix the positioning ring 2 and the core shaft 3 together;

[0045] S2: insert the first section 31 of the core shaft 3 fixed with the positioning ring 2 into the shaft sleeve 11 of the steering assembly 1, and the torsion bar 14 in the shaft sleeve 11 of the steering assembly 1 is inserted into the slot 30 of the core shaft 3, and the positioning ring 2 is in contact with the support seat 13. When the worm gear 12 and the middle valve body assembly 5 are pulled toward the direction close to the front valve body assembly 4, since the depth of the receiving section 211 of the stepped hole 21 of the positioning ring 2 is 1.1 mm, it is ensured that the rear valve body assembly 6 moves a distance of 1.1 mm in the direction of the front valve body assembly 4, and the shaft section 212 abuts against the flange 33 for precise positioning to adjust the gap between the middle valve body assembly 5 and the worm gear 12 to 1.1 mm;

[0046] S3: The rear valve body assembly 6 is sleeved on the core shaft 3, and the second locking sleeve 62 of the rear valve body assembly 6 is locked on the second section 32 of the core shaft 3. Due to the positioning ring 2 on the core shaft 3, the inner diameter of the second locking sleeve 62 in the rear valve body assembly 6 is enlarged when it is sleeved on the positioning ring 2;

[0047] S4: Move the core shaft 3, and sleeve the middle valve body assembly 5 on the shaft sleeve 11, and sleeve the front valve body assembly 4 on the shaft sleeve 11 (at this time, the first locking sleeve 52 of the middle valve body assembly 5 is not locked on the shaft sleeve 11), the elastic clamp 42 of the front valve body assembly 4 clamps the shaft sleeve 11, the second locking sleeve 62 of the rear valve body assembly 6 clamps the core shaft 3 and aligns the core shaft 3 and the middle valve body assembly 5 along the central axis direction, the front valve body assembly 4 drives the steering assembly 1 to rotate and aligns with the core shaft 3 along the central axis direction, after the centering action is completed, the first locking sleeve 52 of the middle valve body assembly 5 is locked on the shaft sleeve 11, and the elastic clamp 42 of the front valve body assembly 4 releases the shaft sleeve 11;

[0048] S5: Move the core shaft through the middle valve body assembly 5 and the rear valve body assembly 6, drill a pin hole 351 on the core shaft 3 and install the pin 3511 in the pin hole;

[0049] S6: After the pin 3511 is installed, the first locking sleeve 52 of the middle valve body assembly 5 releases the shaft sleeve 11, and the second locking sleeve 62 of the rear valve body assembly releases the core shaft 3, and the core shaft 3 is taken out.

[0050] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A C-EPS core shaft assembly mechanism, characterized in that: The invention comprises a steering assembly (1), a positioning ring (2), a core shaft (3), a front valve body assembly (4), a middle valve body assembly (5) and a rear valve body assembly (6); the steering assembly (1) is provided with a shaft sleeve (11), a worm gear (12) sleeved on the shaft sleeve (11), a support seat (13) sleeved on the shaft sleeve (11) and a torsion bar (14) inserted into the shaft sleeve (11); the core shaft (3) comprises a first section (31) and a second section (32) connected to the first section (31); a flange (33) is formed at a connection between the first section (31) and the second section (32); a stepped hole (21) is provided at the center of the positioning ring (2); the positioning ring (2) is sleeved on the core shaft (3) and the flange (33) is received in the stepped hole (21); The middle valve body assembly (5) is sleeved on the shaft sleeve (11) and abuts against the worm gear (12); the front valve body assembly (4) is sleeved on the shaft sleeve (11) and is located on a side of the middle valve body assembly (5) away from the worm gear (12); the first section (31) of the core shaft (3) is inserted into the shaft sleeve (11), and the positioning ring (2) is located on a side of the support seat (13) away from the worm gear (12); the torsion bar (14) is inserted into the core shaft (3); the rear valve body assembly (6) is sleeved on the core shaft (3) and is located on a side of the support seat (13) away from the worm gear (12), and the rear valve body assembly (6) abuts against the positioning ring (2); The stepped hole (21) comprises a receiving section (211) and an over-axis section (212) connected to the receiving section (211); the size of the over-axis section (212) is smaller than the size of the receiving section (211); the flange (33) is received in the stepped hole (21), and the connection between the over-axis section (212) and the receiving section (211) abuts against the flange (33); The core shaft (3) has a slot (30), and the torsion bar (14) is inserted into the slot (30) of the core shaft (3); A positioning groove (34) is provided at the connection between the flange (33) and the second section (32), and the positioning ring (2) is installed in the positioning groove (34).

2. The C-EPS core shaft assembly mechanism according to claim 1, characterized in that: The depth of the receiving section (211) is 1.1 mm.

3. The C-EPS core shaft assembly mechanism according to claim 1, characterized in that: The core shaft (3) is provided with a pin hole (351), and a pin (3511) penetrating the torsion bar (14) is arranged in the pin hole (351).

4. The C-EPS core shaft assembly mechanism according to claim 1, characterized in that: A top screw (22) is provided on the side wall of the positioning ring (2).

5. The C-EPS core shaft assembly mechanism according to claim 1, characterized in that: The middle valve body assembly (5) comprises a middle valve body shell (51) and a first locking sleeve (52) accommodated in the middle valve body shell (51).

6. The C-EPS core shaft assembly mechanism according to claim 1, characterized in that: The rear valve body assembly (6) comprises a rear valve body shell (61) and a second locking sleeve (62) accommodated in the rear valve body shell (61).

7. The C-EPS core shaft assembly mechanism according to claim 1, characterized in that: The front valve body assembly (4) comprises a front valve body shell (41) and an elastic clamp (42) accommodated in the front valve body shell (41).

8. The method for adjusting the gap of the core shaft assembly mechanism of C-EPS according to any one of claims 1 to 7, characterized in that: The steps include: S1: The positioning ring (2) is sleeved onto the core shaft (3), and the flange (33) is received in the receiving section (211) of the stepped hole (21), and the top screw (22) in the side wall of the positioning ring (2) is tightened to fix the positioning ring (2) and the core shaft (3); S2: inserting the core shaft (3) fixed with the positioning ring (2) into the shaft sleeve (11) of the steering assembly (1), and inserting the torsion bar (14) in the shaft sleeve (11) of the steering assembly (1) into the slot (30) of the core shaft (3), the positioning ring (2) contacts the support seat (13), pulling the worm gear (12) and the middle valve body assembly (5) in a direction close to the front valve body assembly (4), and the rear valve body assembly (6) moves in the direction of the front valve body assembly (4) so ​​that the rear shaft section (212) abuts against the flange (33); S3: The rear valve body assembly (6) is sleeved onto the core shaft (3), and the second locking sleeve (62) of the rear valve body assembly (6) is locked onto the core shaft (3); S4: Move the core shaft (3), and sleeve the middle valve body assembly (5) on the shaft sleeve (11), sleeve the front valve body assembly (4) on the shaft sleeve (11), the elastic clamp (42) of the front valve body assembly (4) clamps the shaft sleeve (11), the second locking sleeve (62) of the rear valve body assembly (6) clamps the core shaft (3) and aligns the core shaft (3) and the middle valve body assembly (5) along the central axis direction, the front valve body assembly (4) drives the steering assembly (1) to rotate and aligns with the core shaft (3) along the central axis direction, after the centering action is completed, the first locking sleeve (52) of the middle valve body assembly (5) is locked on the shaft sleeve (11), and the elastic clamp (42) of the front valve body assembly (4) releases the shaft sleeve (11); S5: moving the core shaft through the middle valve body assembly (5) and the rear valve body assembly (6), drilling a pin hole (351) on the core shaft (3) and installing a pin (3511) in the pin hole (351); S6: After the pin (3511) is installed, the first locking sleeve (52) of the middle valve body assembly (5) releases the shaft sleeve (11), and the second locking sleeve (62) of the rear valve body assembly (5) releases the core shaft (3), and the core shaft (3) is removed.

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