Structure of Jacking Point

Abstract

To inhibit distortion of a vehicle, damage to the vehicle and the like during a jack-up operation.SOLUTION: A jack-up point 13 is molded in a lower part of a housing of an in-vehicle electric motor by casting. A bottom 13a of the jack-up point 13 is provided with a jack-up surface 20 for being lifted up first by a jack device, and partial contact surfaces 22a-22d that are formed around the jack-up surface 20.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the structure of a jack-up point used when jacking up a vehicle.

Background Art

[0002] In the structure of Patent Document 1, as shown in FIG. 9, a floor jack 3 is used when jacking up a vehicle. In order to install the floor jack 3, a separate part 2 is attached in consideration of the height from surrounding parts and projected as a jack-up point surface 4.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as the vehicle is lifted during jacking up, the vehicle may tilt, so there is a case where the point where the floor jack 3 hits deviates from the jack-up point surface 4. If jacking up continues in this state, the vehicle may be distorted or damaged.

[0005] The present invention is made to solve such conventional problems, and aims to suppress distortion and damage of the vehicle during jacking up.

Means for Solving the Problems

[0006] (1) The present invention is a structure of a jack-up point that is disposed in a protruding manner from the bottom surface of a vehicle and is jacked up by a jacking device, The bottom of the jacking point includes a jacking point surface that is first lifted by the jacking device, and a contact surface formed around the jacking point surface, and is characterized by comprising the same.

[0007] (2) In one aspect of the present invention, a concave depression with an inverted cross-section is formed at the bottom of the jacking point, the jacking point surface consists of the bottom surface of the depression, the contact surface consists of the inclined inner surface of the depression, while both surfaces are configured as planes, a curved surface is formed between the two surfaces, and the radius of curvature of the curved surface is approximated to a plane, which is characterized.

[0008] (3) In another aspect of the present invention, a sound and vibration countermeasure shape portion for suppressing roll is formed on the outer periphery at the base of the jacking point, which is characterized.

[0009] (4) In still another aspect of the present invention, a cutout portion is formed at at least one of both ends of the jacking point, which is characterized.

[0010] (5) In still another aspect of the present invention, the inner surface of at least one cutout portion is formed as a curved surface, and the curved surface is formed such that "radius of the curved surface / thickness from the inner surface to the side surface ≥ 0.8", which is characterized.

[0011] (6) In still another aspect of the present invention, a curved surface for relaxing the stress during jacking is formed on the outer periphery at the base of the jacking point, and the curved surface is formed such that "radius of the curved surface / thickness ≥ 5", which is characterized.

[0012] (7) In still another aspect of the present invention, The structure of the jacking point according to any one of claims 1 to 6, characterized in that a protector for mitigating the impact during a vehicle collision is provided.

[0013] (8) In still another aspect of the present invention, The jacking point is characterized in that it is formed by casting out a slide mold during casting.

[0014] (9) In still another aspect of the present invention, The jacking point is characterized in that it is integrally cast into an electric motor or an integrated product of a power converter and an electric motor.

[0015] (10) In still another aspect of the present invention, The jacking point is characterized in that it is integrally cast into a speed reducer, a gear case, and an oil pan.

Advantages of the Invention

[0016] According to the present invention, it is possible to suppress vehicle distortion and damage during jacking.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0018] Hereinafter, the structure of the jack-up point according to the embodiment of the present invention will be described based on Examples 1 to 4.

[0019] ≪Example 1≫ Example 1 will be described based on FIGS. 1 to 5. As shown in FIG. 1, the jack-up structure of the present example is applied to an electric motor (motor / motor-inverter integrated product / speed increasing and decreasing gear-motor-inverter integrated product) 11 mounted on a vehicle (passenger car) 10.

[0020] As shown in FIG. 2, the electric motor 11 includes a motor body 12 for driving the rear wheels of the vehicle 10 and a jack-up point (jack-up seat) 13 integrally formed with the motor body 12. In FIGS. 1 and 3, the A-B direction indicates the front-rear direction of the vehicle 10, the C-D direction indicates the left-right direction thereof, and the E-F direction indicates the vertical direction thereof.

[0021] The motor body 12 includes a rotating shaft 15 rotatably supported by a housing 16, a rotor (not shown) fixed to the rotating shaft 15, and a stator (not shown) disposed opposite to the rotor in the housing 16. A speed increasing and decreasing gear 40 is connected to the rotating shaft 15, and electric power converted by an inverter (not shown) is supplied to the motor body 12.

[0022] The jacking-up point 13 is used when jacking up the vehicle 10 using a jacking device such as the floor jack 3. That is, when changing the tires of the rear wheels 14 or performing an under inspection on the rear wheel 14 side, it is necessary to temporarily lift the vehicle 10.

[0023] At this time, the jacking-up point 13 is formed at the lower part of the housing 16 along the self-weight direction of the motor body 12 and the compression direction during jacking-up, and protrudes from the bottom surface of the vehicle 10 (see Fig. 1). Therefore, the floor jack 3 may be installed under the jacking-up point 13 and jacked up.

[0024] Specifically, as shown in Figs. 3 and 4, the jacking-up point 13 is formed in a substantially rectangular cross-section (P-P cross-section) and has weight-reducing cutouts 17 to 19 formed at both ends arranged in the front-rear direction of the vehicle 10. Further, the jacking-up point 13 includes side surfaces 13b, 13c and a bottom surface 13a between the both side surfaces (columns) 13b, 13c. This bottom surface 13a is configured as a receiving part of the jacking device (hereinafter referred to as the receiving part 13a).

[0025] <Receiving part 13a> The receiving part 13a will be described with reference to Fig. 3. The receiving part 13a is configured to enable the jacking-up of the vehicle 10 by the jacking device from any position.

[0026] That is, a recess with a concave cross-section is formed substantially at the center of the lower surface of the receiving part 13a, and includes a bottom surface 20 of the recess formed in a rectangular plane, lower inner surfaces 21a, 21c formed on a curved surface continuously rising from the long side of the bottom surface 20, upper inner surfaces 22a, 22c formed on an inclined plane continuously rising from the upper edges of the inner surfaces 20a, 20c, lower inner surfaces 21b, 21d formed on a curved surface continuously rising from the short side of the bottom surface 20, and upper end surfaces 22b, 22d extending flatly from the upper edges of the lower inner surfaces 21b, 21d.

[0027] Therefore, the receiving part 13a includes five planes and four curved surfaces. Each of the surfaces 21a, 21c, 22a, and 22c is arranged on the widthwise side of the vehicle 10, and each of the surfaces 21b, 21d, 22b, and 22d is arranged on the front-rear direction side. Also, the inner surfaces 21a to 21d surround the bottom surface 20, while the inner surfaces 22a, 22c and the upper end surfaces 22b, 22d surround the inner surfaces 21a to 21d, and the inner surfaces 21a to 21d are arranged between the bottom surface 20 and the surfaces 22a to 22d.

[0028] At this time, the bottom surface 20 is a jack-up point surface (plane) that is first lifted when the jacking device is installed, and is formed with an area larger than the surfaces 21a to 21d, 22a to 22d (hereinafter referred to as the jack-up point surface 20).

[0029] Also, each of the surfaces 22a to 22d is a plane that abuts when the vehicle 10 is tilted to the maximum during jacking up. That is, as the vehicle 10 is tilted while the vehicle 10 is being jacked up, the jacking device deviates from the jack-up point surface 20 and obliquely abuts on each of the surfaces 22a to 22d. In this sense, each of the surfaces 22a to 22d can be said to be an abutting surface of the jacking device.

[0030] Furthermore, the inner surfaces 21a to 21d are formed with the curvature radius R as large as possible so as to have a shape close to a plane. That is, by bringing the inner surfaces 21a to 21d closer to a plane, the concentrated load due to jacking up is dispersed and formed into a shape capable of stress relaxation. In particular, if it is formed into a curved surface with a large curvature radius R, it will be crushed by jacking up and deformed into a plane, so it is easy to become a shape capable of relaxing stress in this regard.

[0031] If such a jacking point 13 is formed solid, its rigidity (strength) can be guaranteed and the stress can be reduced, but there are drawbacks such as an increase in the product weight of the motor 11 and the occurrence of shrinkage cavities inside. Therefore, the jacking point 13 is shaped into a thin-walled shape with guaranteed rigidity and a shape that can be formed by a slide mold. That is, the shape of the jacking point 13 is integrally formed with the housing 16 by casting. At this time, in order to make it a thin-walled shape, it is composed of a plurality of combinations of the cross-sectional shapes shown in FIGS. 4(b) to (e) whose second moment of area is equal to or greater than the specified value. Thereby, the risk of breakage of the jacking point 13 can be suppressed.

[0032] <Measures against stress relaxation and vibration noise> The bases of the side surfaces 13b and 13c of the jacking point 13 are provided with the following stress relaxation and vibration noise countermeasure shapes because the stress during jacking is likely to be excessive.

[0033] (1) As shown in FIGS. 5(a) and 5(b), the jacking point 13 has a curved surface 27 formed at the base. This curved surface 27 is formed so that "curvature radius R / thickness T of the side surfaces 13b and 13c ≥ 5" in order to reduce the stress of the stator shrink fit inside the motor and the stress on the base due to jacking.

[0034] (2) Since the jacking point 13 is formed with cutouts 17 to 19, its rigidity in the vertical direction is weak, and there is a risk of rolling sideways during running and hindering the running of the vehicle 10. Therefore, as shown in FIGS. 5(a) and 5(c), a vibration noise countermeasure boss portion 26 is formed at the base from the viewpoint of suppressing the rolling width.

[0035] However, the configuration of the boss portion 26 is an example of vibration noise countermeasures, and a rib in the vertical direction or a boss portion with other configurations may be provided to suppress the swaying width of the jacking point 13. Note that a stress relaxation protrusion 25 is also formed adjacent to the boss portion 26 at the base. This protrusion 25 suppresses the stress concentration on the parting line at the base during jacking.

[0036] (3) The hollowed-out portion 18 of the jacking-up point 13 is formed as a cylindrical space, and the inner peripheral surface is formed as the stress-relieving curved surface 30. This curved surface 30 is defined by the relationship between the radius of curvature R and the wall thickness T as "R / T ≥ 0.8" in order to reduce the bending moment during jacking up.

[0037] <Function and Effect> According to the jacking-up point 13 of the above-described Example 1, the following effects can be obtained.

[0038] (A) When temporarily lifting the vehicle 10 such as during tire replacement, the jacking device is installed on the jacking-up point surface 20.

[0039] At this time, as the vehicle 10 is lifted, the vehicle 10 tilts. Therefore, as described above, although the jacking device comes off the jacking-up point surface 20, it contacts obliquely with the surrounding abutment surfaces 22a to 22d. Accordingly, the jacking device does not come off from the receiving portion 13a, and distortion and damage of the vehicle due to jacking up are prevented.

[0040] (B) Since the shape of the jacking-up point 13 is integrally formed with the housing 16 by casting, it is not necessary to attach a separate part 2 as in Patent Document 1 and project it as the jacking-up point surface 4. In this regard, the number of parts is suppressed, the efficiency of the jacking operation is improved, and the cost can be reduced.

[0041] (C) Since the stress-relieving and sound vibration countermeasure shape is provided on the jacking-up point 13, concentration of stress at the root due to stress and shrink fitting of the stator during jacking up is suppressed, and the lateral sway width during vehicle travel is also suppressed.

[0042] (D) Note that the jacking-up point 13 is formed in a thin-walled shape with guaranteed rigidity as described above, and the hollowed-out portions 17 to 19 are formed, so that the mass is reduced.

[0043] <<Example 2>> Example 2 will be described with reference to FIG. 6. In this example, a sheet metal vehicle protector 41 is provided for the electric motor 11 mounted on the vehicle 10.

[0044] This vehicle protector 41 is fixed to the housing 16 by screw fastening or welding. This vehicle protector 41 protects the jack-up point 13 from grounding and short-circuiting of the electric motor 11 during a vehicle collision.

[0045] ≪Example 3≫ Example 3 will be described with reference to FIG. 7. In this example, a rib-shaped vehicle protector 42 formed by casting is integrally molded on the housing 16 of the electric motor 11. This vehicle protector 42, like the vehicle protector 41, protects the jack-up point 13 from grounding and short-circuiting of the electric motor 11 during a vehicle collision.

[0046] ≪Example 4≫ Example 4 will be described with reference to FIG. 8. In FIG. 8(a), the jack-up point 13 is applied to the gear case 43 mounted on the vehicle. On the other hand, in FIG. 8(b), the jack-up point 13 is applied to the same oil pan 44.

[0047] Thus, the jack-up point 13 can be added to vehicle parts other than the electric motor 11. However, FIGS. 8(a) and 8(b) are merely examples, and the jack-up point 13 may be added to other vehicle parts.

[0048] Note that the present invention is not limited to the above-described embodiments, and can be implemented with modifications within the scope described in each claim. For example, the cutout portions 17 to 19 do not all need to be formed, and can be increased or decreased according to the mass of the jack-up point 13. In this case, one of the cutout portions 17, 18 / the cutout portion 19 may be omitted, or one of the cutout portions 17 and 18 may be omitted. However, since the stress-relieving curved surface 30 is formed in the cutout portion 18, it is preferably not omitted.

Explanation of Reference Numerals

[0049] 3… Jacking-up device 10… Vehicle 11… Electric motor 13… Jacking-up point 16… Housing 13a… Jacking-up point surface 13b, 13c… Same-side side surfaces 20… Bottom surface (flat surface) 21a~21d… Lower inner surfaces (curved surfaces) 22a, 22c… Upper inner surfaces (flat surfaces) 22b, 22d… Upper end surfaces (flat surfaces) 27, 30… Curved surfaces 17~19… Cut-out parts 25… Stress relief protrusion 26… Vibration countermeasure boss part (vibration countermeasure part) 43, 44… Vehicle protector

Claims

1. A structure of a jack-up point that is disposed to protrude from the bottom surface of a vehicle and is jacked up by a jacking device, wherein the bottom of the jack-up point includes a jack-up point surface that is first lifted by the jacking device and a contact surface formed around the jack-up point surface, and includes, the jack-up point, is formed by punching of a slide mold during casting, and is cast and formed on an electric motor mounted on a vehicle, an integrated product of a power converter and an electric motor, or an integrated product of a power converter, an electric motor, and a speed increaser / decreaser. A structure of a jack-up point, characterized in that.

2. A recess having a reverse concave cross section is formed at the bottom of the jack-up point, the jack-up point surface is formed of the bottom surface of the recess, the contact surface is formed of the inclined inner surface of the recess, while the jack-up point surface and the contact surface are configured as planes, a curved surface is formed between the jack-up point surface and the contact surface, A structure of a jack-up point according to claim 1, characterized in that the radius of curvature of the curved surface approximates a plane.

3. A sound and vibration countermeasure shape portion for suppressing roll is formed on the outer periphery at the base of the jack-up point. A structure of a jack-up point according to claim 1 or 2, characterized in that.

4. A structure of a jack-up point according to any one of claims 1 to 3, characterized in that a cutout portion is formed at at least one end of both ends of the jack-up point in the longitudinal direction of the vehicle.

5. A cylindrical cutout portion is formed in the jack-up point, and the inner surface of the cutout portion is formed as a curved surface. The curved surface is formed such that "the radius of curvature of the curved surface / the thickness from the inner surface to the side surface of the jack-up point in the left-right direction of the vehicle ≥ 0.8". A structure of a jack-up point according to any one of claims 1 to 4, characterized in that.

6. A curved surface for relaxing stress when the jack-up point is jacked up is formed on the outer periphery at the base of the jack-up point. A structure of a jack-up point according to claim 5, characterized in that the curved surface is formed such that "the radius of curvature of the curved surface / the thickness ≥ 5".

7. A structure of a jack-up point according to any one of claims 1 to 6, characterized in that a protector for alleviating impact during vehicle collision is provided.

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