Lifting point structure

Abstract

The present invention relates to a jacking point structure, which is arranged to protrude from the bottom surface of a vehicle and is configured to be lifted by a jacking device, the jacking point structure comprising a bottom portion, the bottom portion comprising: a jacking point surface, the jacking point surface being configured to be first lifted by the jacking device; and a partial contact surface, the partial contact surface being arranged around the jacking point surface. The bottom portion of the jacking point structure comprises a curved surface between the jacking point surface and the partial contact surface.

Description

Technical Field

[0001] The invention relates to a jacking point structure for jacking a vehicle. Background Art

[0002] Patent document 1 discloses a structure for using a floor jack 3 when lifting a vehicle, such as Fig. 9 For positioning the floor jack 3, the structure comprises a further component 2, so that the lifting point surface 4 is raised taking into account the height of the surrounding components.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: JP H8-188178A Summary of the invention

[0006] Technical Problems to be Solved by the Invention

[0007] However, jacking will lift the vehicle and tilt the vehicle, which may cause the contact point of the floor jack 3 to separate from the jacking point surface 4. If jacking is continued in this state, the vehicle may be deformed and / or damaged.

[0008] In view of the above circumstances, it is desirable to solve this conventional problem by suppressing deformation or damage of a vehicle when jacking up.

[0009] Means of solving the problem

[0010] (1) According to one aspect of the present invention, a jacking point structure arranged to protrude from a bottom surface of a vehicle and configured to be lifted by a jacking device includes a bottom portion, which includes: a jacking point surface, which is configured to be first lifted by the jacking device; and a partial contact surface arranged around the jacking point surface.

[0011] (2) According to another aspect of the present invention, the bottom of the lifting point structure includes a recessed portion having an inverted U-shape when viewed in cross section. The lifting point surface includes a bottom surface of the recessed portion. The partial contact surface includes an inclined inner surface of the recessed portion. Each of the lifting point surface and the partial contact surface is flat. The bottom of the lifting point structure includes a curved surface between the lifting point surface and the partial contact surface. The curved surface has a radius of curvature set so that the curved surface is close to flat.

[0012] (3) According to another aspect of the present invention, the jacking point structure further includes a sound and vibration suppression portion which is provided on an outer periphery of a root of the jacking point structure and is configured to suppress horizontal swaying of the jacking point structure.

[0013] (4) According to another aspect of the present invention, the jacking point structure further includes a weight reduction hole provided at one of the two ends of the jacking point structure.

[0014] (5) According to another aspect of the present invention, the lightening hole includes an inner surface that is curved to satisfy the following condition: (radius of curvature) / (thickness from inner surface to side surface) ≥ 0.8.

[0015] (6) According to another aspect of the present invention, the lifting point structure further includes a curved surface, which is arranged on the outer periphery of the root of the lifting point structure, is configured to relax the stress generated by the lifting, and is bent to meet the following conditions: (radius of curvature) / (thickness)≥5.

[0016] (7) According to another aspect of the present invention, the jacking point structure further includes a protector configured to mitigate impact during a vehicle collision.

[0017] (8) According to another aspect of the present invention, the jacking point structure is formed by casting using a slip mold.

[0018] (9) According to another aspect of the present invention, the jacking point structure is integrally formed with the electric motor by casting, or is integrally formed with the electric motor and the power converter by casting.

[0019] (10) According to another aspect of the present invention, the jacking point structure is formed on the speed reducer, the gear box or the oil pan by casting.

[0020] Effects of the Invention

[0021] The invention is used for preventing a vehicle from being deformed or damaged during jacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram showing that an electric motor including a jacking point according to a first embodiment is installed in a vehicle.

[0023] Figure 2 is a front view of the electric motor.

[0024] Figure 3 This is a bottom view of the jacking point.

[0025] Figure 4 A is along Figure 3 A cross-sectional view taken along line PP in FIG. Figure 4 B is along Figure 4 A cross-sectional view taken along line GG. Figure 4 C is along Figure 4 A cross-sectional view taken along line HH or II. Figure 4 D is along Figure 4 A cross-sectional view taken along line JJ. Figure 4E is along Figure 4 A cross-sectional view taken along line KK.

[0026] Figure 5 A is a perspective view of the bottom of the jacking point. Figure 5 B and 5C are respectively Figure 5 A corresponds to the front and rear views.

[0027] Figure 6 6A and 6B are side and front views, respectively, of an electric motor including jacking points according to a second embodiment.

[0028] Figure 7 7A and 7B are a side view and a front view, respectively, of an electric motor including a jacking point according to a third embodiment.

[0029] Figure 8 A is a partial cross-sectional view showing the jacking points according to the fourth embodiment. Figure 8 B is a partial cross-sectional view showing the jacking point according to the fifth embodiment.

[0030] Fig. 9 This is a partial cross-sectional view of Patent Document 1. DETAILED DESCRIPTION

[0031] The jacking point structures according to first to fifth embodiments of the present invention are described below.

[0032] [First embodiment]

[0033] Reference below Figures 1 to 5 C describes the first embodiment. Figure 1 As shown, the jacking point structure according to the first embodiment is applied to an electric motor 11 (eg, a motor, an integrated device of a motor and an inverter, or an integrated device of a motor, an inverter and a transmission) installed in a vehicle 10 (eg, a passenger car).

[0034] like Figure 2 As shown, the electric motor 11 includes a motor body 12 for driving the rear wheels of the vehicle 10, and includes a jacking point 13 (i.e., a jacking seat) integral with the motor body 12. Figure 1 and Figure 3 , the AB direction indicates the front-rear direction of the vehicle 10 , and the CD direction indicates the left-right direction of the vehicle 10 .

[0035] The motor body 12 includes: a housing 16; a rotating shaft 15 rotatably (i.e., pivotably) supported by the housing 16; a rotor (not shown) fixed to the rotating shaft 15; and a stator (not shown) disposed in the housing 16 opposite to the rotor. The rotating shaft 15 is connected to the speed change device 40. The motor body 12 is powered by electric power converted by an inverter (not shown).

[0036] The jacking points 13 can be used when a jacking device (such as a floor jack 3) is used to jack up the vehicle 10. For example, the vehicle 10 must be temporarily lifted when changing the tire of the rear wheel 14, inspecting the underbody of the rear wheel 14, etc.

[0037] like Figure 1 As shown, the jacking point 13 is formed below the housing 16, extends in the weight direction of the motor body 12 (consistent with the compression direction during jacking), and protrudes relative to the bottom surface of the vehicle 10. Therefore, jacking is completed by placing the floor jack 3 below the jacking point 13.

[0038] like Figure 3 and Figure 4 A to Figure 4 As shown in FIG. 1E, the jacking point 13 has a generally rectangular shape when viewed in a cross section taken along line PP, and the jacking point includes weight-reducing holes 17 to 19 for reducing weight. The weight-reducing holes 17 to 19 are provided at both ends of the jacking point 13 in the front-rear direction of the vehicle 10. In addition, the jacking point 13 includes a pair of side walls 13b and 13c, and a bottom 13a formed between the pair of side walls (i.e., a pair of pillars) 13b and 13c. The bottom 13a is configured to receive a jacking device, hereinafter referred to as a receiver 13a.

[0039] <Receiver 13a>

[0040] The following references Figure 3 The receiver 13a is described. The receiver 13a allows the vehicle 10 to be jacked up from any position using a jacking device.

[0041] The receiver 13a includes a lower surface including a concave portion having a concave cross section at a substantially central position of the lower surface. Specifically, the lower surface of the receiver 13a includes: a bottom surface 20 of the concave portion, which is a rectangular plane; lower inner side surfaces 21a and 21c, which are curved surfaces extending continuously upward from the long sides of the bottom surface 20; upper inner side surfaces 22a and 22c, which are inclined planes extending continuously upward from the upper edges of the lower inner side surfaces 21a and 21c; lower inner side surfaces 21b and 21d, which are curved surfaces extending continuously upward from the short sides of the bottom surface 20; and upper end surfaces 22b and 22d, which are planes extending continuously from the upper edges of the lower inner side surfaces 21b and 21d.

[0042] Therefore, the receiver 13a includes five flat surfaces and four curved surfaces. The surfaces 21a, 21c, 22a and 22c are arranged along a line in the width direction of the vehicle 10. The surfaces 21b, 21d, 22b and 22d are arranged along a line in the front-rear direction of the vehicle 10. In addition, the lower inner surfaces 21a to 21d surround the bottom surface 20, while the upper inner surfaces 22a and 22c and the upper end surfaces 22b and 22d surround the lower inner surfaces 21a to 21d. Therefore, the lower inner surfaces 21a to 21d are arranged between the bottom surface 20 and the surfaces 22a to 22d.

[0043] The bottom surface 20 is configured as a flat lifting point surface, which is first lifted when the lifting device is positioned, and the area of ​​the bottom surface is larger than the area of ​​any one of the surfaces 21a to 21d and the surfaces 22a to 22d. Hereinafter, the bottom surface 20 is referred to as the lifting point surface 20.

[0044] Each of the surfaces 22a to 22d is a plane and is configured to receive partial contact when the vehicle 10 is tilted to the maximum extent during the jacking process of the vehicle 10. Specifically, the jacking of the vehicle 10 causes the vehicle 10 to tilt, causing the jacking device to separate from the jacking point surface 20 and to make inclined partial contact with one of the surfaces 22a to 22d. Therefore, the surfaces 22a to 22d serve as partial contact surfaces with the jacking device.

[0045] The curvature radius R of each of the lower inner surfaces 21a to 21d is as large as possible, thereby making it close to flat. Such a structure in which the lower inner surfaces 21a to 21d are formed to be close to flat can disperse the load concentrated due to jacking and relax the stress. Specifically, such a configuration in which the lower inner surfaces 21a to 21d are formed as curved surfaces with a large curvature radius R is conducive to stress relaxation because such a curved surface is compressed and deformed into a flat surface by jacking.

[0046] If the lifting point 13 is solid (i.e. not hollow), such a structure can ensure rigidity and reduce stress, but it will increase the weight of the electric motor 11 and create a shrinkage cavity inside the electric motor 11. In view of this, the lifting point 13 in this embodiment has a thin shape, which can ensure its rigidity while being able to use slip molding. Specifically, the lifting point 13 is integrally formed with the housing 16 by casting. The thin shape of the lifting point 13 is based on Figure 4 B to Figure 4 The combination of the cross-sectional shapes of E determines that the secondary bending moment of each cross-sectional shape is equal to or greater than the predetermined value of the secondary bending moment of the cross-sectional shape. This can reduce the possibility of damaging the jacking point 13.

[0047] <Stress relaxation, sound and vibration suppression>

[0048] The side walls 13b and 13c of the jacking point 13 are likely to be subjected to excessive stress at their roots when jacking. Therefore, the shapes of the roots of the side walls 13b and 13c take into account stress relaxation and sound and vibration suppression.

[0049] (1) Figure 5 As shown in FIGS. 5A and 5B, each root of the side walls 13b and 13c of the jacking point 13 includes a curved surface 27. The shape of each curved surface 27 satisfies the condition of "(radius of curvature R) / (thickness T of the side walls 13b, 13c) ≥ 5" to relieve the stress inside the motor caused by the stator shrink fit and the stress at the root caused by the jacking.

[0050] (2) The lifting point 13 includes weight-reducing holes 17 to 19. This will weaken the vertical rigidity of the lifting point 13 and may cause the lifting point 13 to sway horizontally during the driving of the vehicle 10, thereby affecting the driving. Figure 5 As shown in FIGS. 5A and 5C, the jacking point 13 includes a sound and vibration dampening boss 26 adjacent one of the roots to reduce the width of the swing.

[0051] The configuration of the sound and vibration suppressing boss 26 described above is only one example of a measure for suppressing sound and vibration, and may be modified by forming a vertical rib or boss configured in another manner to reduce the swing width of the jacking point 13. In addition, one of the roots is further provided with a stress relaxation protrusion 25 adjacent to the sound and vibration suppressing boss 26. The role of the stress relaxation protrusion 25 is to suppress stress concentration on the parting line of the root during jacking.

[0052] (3) The lightening hole 18 of the jacking point 13 defines a cylindrical space inside thereof and includes an inner peripheral surface formed as a stress relaxation curved surface 30. The stress relaxation curved surface 30 satisfies the condition of "(radius of curvature R) / (thickness T) ≥ 0.8" to reduce the bending moment during jacking.

[0053] <Effect>

[0054] The jacking points 13 according to the above-described first embodiment have the following effects.

[0055] (A) When temporarily lifting the vehicle 10 to change a tire or the like, the jacking device is located at the jacking point surface 20 .

[0056] Lifting the vehicle 10 tilts the vehicle 10 and causes the jacking device to come off the jacking point surface 20. However, as described above, the jacking device comes into contact with the inclined portions of the contact surfaces 22a to 22d around the jacking point surface 20. This prevents the jacking device from coming off the receiver 13a and prevents the vehicle from being deformed or damaged due to the jacking.

[0057] (B) The lifting point 13 is integrally formed with the housing 16 by casting. This eliminates the need to install an additional component 2 to protrude the lifting point surface 4 as disclosed in Patent Document 1. This can reduce the number of components, improve lifting operation efficiency, and reduce costs.

[0058] (C) The jacking point 13 is provided with the above-mentioned measures for stress relaxation and sound and vibration suppression. This can suppress the stress generated by jacking and the stress generated by stator shrink fit from concentrating at the root, while suppressing the sway width during vehicle driving.

[0059] (D) As described above, the jacking point 13 has a thin shape while ensuring strength while including the lightening holes 17 to 19. This makes it possible to reduce the weight of the jacking point 13.

[0060] [Second embodiment]

[0061] Reference below Figure 6 A and 6B describe the second embodiment. According to the second embodiment, the electric motor 11 installed in the vehicle 10 includes a vehicle protector 41 made of a metal plate.

[0062] The vehicle protector 41 is fixed to the housing 16 by screw fastening or welding, and protects the jacking point 13 from a ground fault and a short circuit fault of the electric motor 11 due to a vehicle collision.

[0063] [Third embodiment]

[0064] Reference below Figure 7 A and 7B describe a third embodiment. According to the third embodiment, the electric motor 11 includes a vehicle protector 42 which is formed with ribs and is integrally formed with the housing 16 by casting. Similar to the vehicle protector 41, the vehicle protector 42 can protect the jacking point 13 from ground faults and short circuit faults of the electric motor 11 caused by a vehicle collision.

[0065] [Fourth and fifth embodiments]

[0066] The following are references Figure 8 A and Figure 8 B describes the fourth and fifth embodiments. Figure 8 In A, the jacking point 13 is applied to the gearbox 43 installed in the vehicle. Figure 8 In B, the jacking point 13 is applied to an oil pan 44 mounted in the vehicle.

[0067] Thus, jacking points 13 can be added to vehicle components other than the electric motor 11 . Figure 8 A and Figure 8 B is only an example, and the jacking points 13 may be added to vehicle components other than those shown in the figure.

[0068] The present invention is not limited to the above-described embodiments, but may be modified within the scope of the claims. For example, it is not necessary to form all of the lightening holes 17 to 19. The number of lightening holes may be changed according to the weight of the jacking point 13. It is permissible to omit one of the lightening holes 17, 18, and the lightening hole 19, or to omit one of the lightening holes 17 and the lightening hole 18. However, it is preferable not to omit the lightening hole 18 because the lightening hole 18 includes the stress relaxation curved surface 30.

Claims

1. A jacking point structure, which is arranged to protrude from a bottom surface of a vehicle and is configured to be lifted by a lifting device, the jacking point structure comprising: A bottom portion, the bottom portion comprising: a jacking point surface configured to be initially lifted by the jacking device; and a partial contact surface, the partial contact surface being arranged around the jacking point surface, in: the bottom of the jacking point structure includes a concave portion having an inverted U-shape when viewed in cross-section; The jacking point surface includes a bottom surface of the recessed portion; The portion of the contact surface includes an inclined inner surface of the concave portion; Each of the jacking point surface and the portion of the contact surface is flat; The bottom of the jacking point structure includes a curved surface between the jacking point surface and the partial contact surface; The curved surface has a radius of curvature set so that the curved surface is close to flat and is compressed and deformed into a flat surface by jacking; and The partial contact surface is configured such that, when the vehicle is at the maximum tilt during vehicle jacking, the jacking device disengages from the jacking point surface and contacts the tilted portion of the partial contact surface.

2. The jacking point structure according to claim 1, further comprising: A sound and vibration suppression portion is provided on an outer periphery of a root portion of the jacking point structure and is configured to suppress horizontal swaying of the jacking point structure.

3. The jacking point structure according to claim 1 or 2, further comprising: A weight-reducing hole is provided at one of the two ends of the jacking point structure.

4. The jacking point structure according to claim 3, wherein: The lightening hole includes an inner surface, and the inner surface is curved to meet the following conditions: (The radius of curvature of the inner surface) / (the thickness from the inner surface to the side surface of the jacking point structure)≥0.

8.

5. The jacking point structure according to claim 4, further comprising: A curved surface, which is provided on the outer periphery of the root of the jacking point structure, is configured to relax stress generated by jacking, and is curved to satisfy the following conditions: (radius of curvature of the curved surface) / (thickness)≥5.

6. The jacking point structure according to claim 1 or 2, further comprising: A protector is configured to mitigate impact during a vehicle collision.

7. The jacking point structure according to claim 1 or 2, wherein the jacking point structure is formed by casting using a slip form.

8. The jacking point structure according to claim 7, wherein the jacking point structure is integrally formed with the electric motor by casting, or is integrally formed with the electric motor and the power converter by casting.

9. The jacking point structure according to claim 7, wherein the jacking point structure is formed on the speed reducer, the gear box or the oil pan by casting.

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