An insert locking device for an automobile motor end cover mold

Abstract

The present invention relates to an insert locking device for an automobile motor end cover mold, comprising a core arranged on one of the half molds, the core having a mounting portion for sleeve mounting an insert; a rotating shaft is arranged on the core, a handle for rotating the rotating shaft is mounted on the upper end of the rotating shaft, and the lower end of the rotating shaft extends to the mounting portion; the mounting portion has an opening for exposing the rotating shaft, so that the insert and the mounting portion are fixed by interference fit; the rotating shaft has a notch, and when the position of the notch coincides with the position of the opening, the insert and the mounting portion are clearance-fitted. This kind of insert locking device is easy to operate, accurate in positioning, smooth in demoulding, and simple in structure. Using this locking device for production can reduce the scrap rate from the previous 5.1% to below 1%.

Description

Technical Field

[0001] The invention relates to an insert locking device for a mould, in particular to an insert locking device for an automobile motor end cover mould. Background Art

[0002] The motor end cover refers to the covers at both ends of the motor casing, which are generally divided into the front cover and the rear cover. The end cover is fixed to the base by screws or rivets, and supports and protects the motor rotor. The bearing chamber of the motor is generally located in the center of the front / rear cover of the motor, which is used to install and fix the motor bearings. The structural strength and installation accuracy of the bearing chamber will directly affect the accuracy, performance and life of the motor bearings. Based on the requirements of motor weight reduction and heat dissipation, most of the motor end covers currently designed are made of aluminum alloy materials. In order to ensure the strength of the bearing chamber in the end cover, a wear-resistant sleeve (usually a steel sleeve) is generally embedded in the aluminum alloy end cover, and the wear-resistant sleeve is subsequently processed to make a motor bearing chamber that meets the use requirements.

[0003] Casting technology is widely used in the production of this type of motor end cover. In order to ensure good bonding between the wear-resistant sleeve and the casting body, the wear-resistant sleeve will be installed on the mold as an insert before casting. At present, the commonly used matching method between the insert and the mold is: several bosses for interference fit are set on the mounting part, and then the insert and the mounting part are fixed together by manual knocking. However, this matching method is extremely difficult to control: if the interference is too large, it will make it difficult to install and demold the insert; if the interference is too small, the insert is not firmly fixed, and external forces such as mold vibration and aluminum liquid flushing may cause the insert to shift or even fall off. In addition, this assembly method is also difficult to accurately position the insert due to uneven force when knocking.

[0004] In summary, there is a need for an insert locking device that is easy to operate, accurately positioned, and has smooth demoulding. In addition, in terms of reducing modification costs and improving modification efficiency, the locking device needs to have a simple structure. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an insert locking device with convenient operation, accurate positioning, smooth demoulding and simple structure in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: the insert locking device of the automobile motor end cover mold includes a core arranged on one of the half molds, and the core has a mounting portion for sleeve-mounting the insert; a rotating shaft is provided on the core, and a handle for rotating the rotating shaft is installed at the upper end of the rotating shaft, and the lower end of the rotating shaft extends to the mounting portion.

[0007] The mounting portion has an opening for exposing the rotating shaft, so that the insert is fixed to the mounting portion by interference fit; the rotating shaft has a notch, and when the notch position matches the opening position, the insert is clearance-fitted with the mounting portion.

[0008] In order to prevent the handle from being broken / bent due to lack of support, a support rod is provided on the handle, and the support rod is supported on the end surface of the half mold.

[0009] For the sake of structural simplicity, a preferred handle structure is that the handle includes a mounting head for fixing to the rotating shaft, and a handle extending from the mounting head, and the support rod is arranged on the handle.

[0010] In order to accurately determine whether the handle is rotated into place, a first resisting component and a second resisting component are arranged at intervals on the rotation path of the handle. When the handle abuts against the first resisting component, the insert and the mounting portion have an interference fit; when the handle abuts against the second resisting component, the insert and the mounting portion have a clearance fit.

[0011] In order to prevent the handle and the rotating shaft from falling out, a baffle is arranged between the first blocking component and the second blocking component, and the handle is located between the baffle and the end surface of the half mold.

[0012] In order to facilitate the replacement of a worn core and a damaged locking device, the core and the half mold are arranged separately.

[0013] In order to better position the insert, the core includes a matching portion that matches the half mold, and the mounting portion, the mounting portion has a smaller diameter than the matching portion, so that a step for positioning the insert is formed between the mounting portion and the matching portion.

[0014] In order to better control the interference, the matching portion has a side convex portion, and the mounting hole for mounting the rotating shaft extends from the side convex portion to the mounting portion.

[0015] In order to better fix the core, the matching portion is provided with a fixing ear for fixing with the half mold.

[0016] In order to fix the device more firmly and evenly, four fixing ears are evenly spaced on the matching portion.

[0017] Compared with the prior art, the advantages of the present invention are: the locking device of the present invention can fix the insert only by putting the insert on the mounting part and then turning the handle, which is easy to operate, thereby improving production efficiency;

[0018] This locking device can accurately fit the insert on the mounting part in a clearance fit state, and then turn the handle to fix it with interference fit, so as to accurately position the insert and prevent the insert from shifting during the casting process, thereby reducing the scrap rate of the product;

[0019] When demoulding is required, the handle is turned to make the insert and the mounting part fit in the gap, and demoulding can be carried out smoothly; this locking device only includes three parts: the core, the shaft, and the handle, with a simple structure, which reduces the cost of mold modification and improves modification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an end cover casting according to an embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the locking device and the mold in accordance with an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A cross-sectional schematic diagram of

[0023] Figure 4 It is a schematic structural diagram of the locking device and the end cover casting in accordance with an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Schematic cross-sectional view of ;

[0025] Figure 6 for Figure 5 A partial enlarged view of part A;

[0026] Figure 7 It is a schematic diagram of the overall structure of the locking device of an embodiment of the present invention;

[0027] Figure 8 for Figure 7 Schematic diagram of the decomposition structure. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the drawings and examples.

[0029] like Figure 1 As shown, the end cover casting 5 prepared by the present invention has a steel sleeve, i.e., an insert 3, embedded in the bearing chamber of the end cover casting 5 .

[0030] like Figures 2 to 8As shown, the automobile motor end cover mold includes two half molds, an upper mold 1 and a lower mold 2. The insert locking device of this embodiment includes: the upper mold 1 is provided with a core 12, and the core 12 has a mounting portion 121 for sleeve-mounting the insert 3; the core 12 is provided with a rotating shaft 13, and the upper end of the rotating shaft 13 is installed with a handle 14 for rotating the rotating shaft 13, and the lower end of the rotating shaft 13 extends to the mounting portion 121; the mounting portion 121 has an opening 15 for exposing the rotating shaft 13, so that the insert 3 and the mounting portion 121 are fixed by interference fit; the rotating shaft 13 has a notch 131, and when the position of the notch 131 coincides with the position of the opening 15, the insert 3 and the mounting portion 121 are clearance-fitted. The locking device of this embodiment is arranged on the upper mold 1, and can also be arranged on other positions such as the lower mold 2 and the side mold as needed. The insert 3 of this embodiment is a steel sleeve. The insert 3 and the mounting portion 121 shown in the figure of this embodiment are in a clearance-fitting state.

[0031] In order to prevent the handle 14 from being broken / bent due to lack of support, a support rod 141 is provided on the handle 14, and the support rod 141 is supported on the end surface of the half mold. For the sake of structural simplicity, the preferred structure of the handle 14 is that the handle 14 includes a mounting head 142 for fixing to the rotating shaft 13, and a handle 143 extending from the mounting head 142, and the support rod 141 is provided on the handle 143.

[0032] In order to accurately determine whether the handle 14 is rotated in place, a first stopper 16 and a second stopper 17 are arranged at intervals on the rotation path of the handle 14. When the handle 14 abuts against the first stopper 16, the insert 3 and the mounting portion 121 have an interference fit; when the handle 14 abuts against the second stopper 17, the insert 3 and the mounting portion 121 have a clearance fit. In order to prevent the handle 14 and the rotating shaft 13 from falling out, a baffle 18 is arranged between the first stopper 16 and the second stopper 17, so that the handle 14 is limited between the baffle 18 and the end surface of the half mold.

[0033] In order to facilitate the replacement of the worn core 12 and the damaged locking device, the core 12 and the half mold are arranged separately.

[0034] In order to better position the insert 3, the core 12 includes a matching portion 122 that matches the half mold, and a mounting portion 121. The diameter of the mounting portion 121 is smaller than that of the matching portion 122, so that a step for positioning the insert 3 is formed between the mounting portion 121 and the matching portion 122. In order to better control the interference, the matching portion 122 has a side convex portion 123, and a mounting hole 124 for mounting the rotating shaft 13 extends from the side convex portion 123 to the mounting portion 121. The side convex portion 123 can be provided with a mounting hole 124 at a suitable position as required, so that the volume of the rotating shaft 13 exposed in the opening 15 can be adjusted according to the needs of the product, thereby controlling the size of the interference.

[0035] In order to better fix the core 12, a fixing ear 125 for fixing with the half mold is provided on the matching portion 122. In order to fix more firmly and evenly, four fixing ears 125 are evenly spaced on the matching portion 122.

[0036] Using the locking device of this embodiment includes the following steps: after the mold is prepared, open the upper mold 1 to completely expose the core 12; use a mold to pre-place the prepared insert 3 on the core 12 so that the inner side of the insert 3 is tightly fitted with the mounting portion 121 of the core; rotate the handle 14 clockwise so that the handle 14 abuts against the first retaining component 16, at which time the insert 3 and the mounting portion 121 have an interference fit, and the insert installation is completed; close the mold and cast; after the casting is completed, open the upper mold 1, rotate the handle 14 counterclockwise so that the handle 14 abuts against the second retaining component 17, at which time the insert 3 and the mounting portion 121 have a clearance fit, and use a push rod to eject the insert and the casting body together to complete the casting.

[0037] When the locking device of the present invention is used for production, the scrap rate caused by improper placement of the insert, insert deviation during casting, etc. is reduced from the previous 5.1% to less than 1%, the one-time installation success rate of the insert is improved, and the production efficiency is significantly improved.

[0038] This embodiment uses the locking device on a low-pressure casting end cover mold. In addition, the locking device can also be used in a gravity casting end cover mold or other product casting molds with a similar insert structure.

[0039] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. An insert locking device for an automobile motor end cover mold, comprising a core (12) arranged on one of the half molds, characterized in that: The core (12) has a mounting portion (121) for sleeve-mounting the insert (3); a rotating shaft (13) is provided on the core (12); a handle (14) for rotating the rotating shaft (13) is installed at the upper end of the rotating shaft (13); and the lower end of the rotating shaft (13) extends to the mounting portion (121); The mounting portion (121) has an opening (15) for exposing the rotating shaft (13), so that the insert (3) and the mounting portion (121) are fixed by interference fit; the rotating shaft (13) has a notch (131), and when the position of the notch (131) matches the position of the opening (15), the insert (3) and the mounting portion (121) are clearance fit.

2. The insert locking device of the automobile motor end cover mold according to claim 1, characterized in that: The handle (14) is provided with a support rod (141), and the support rod (141) is supported on the end surface of the half mold.

3. The insert locking device of the automobile motor end cover mold according to claim 2, characterized in that: The handle (14) comprises a mounting head (142) for fixing to the rotating shaft (13), and a handle (143) extending from the mounting head (142), and the support rod (141) is arranged on the handle (143).

4. The insert locking device of the automobile motor end cover mold according to claim 2, characterized in that: A first stop member (16) and a second stop member (17) are arranged at intervals on the rotation path of the handle (14); when the handle (14) abuts against the first stop member (16), the insert (3) and the mounting portion (121) are interference fit; when the handle (14) abuts against the second stop member (17), the insert (3) and the mounting portion (121) are clearance fit.

5. The insert locking device of the automobile motor end cover mold according to claim 4, characterized in that: A baffle (18) is arranged between the first blocking member (16) and the second blocking member (17), and the handle (14) is located between the baffle (18) and the end surface of the half mold.

6. The insert locking device of the automobile motor end cover mold according to any one of claims 1 to 5, characterized in that: The core (12) and the half mold are arranged separately.

7. The insert locking device of the automobile motor end cover mold according to claim 6, characterized in that: The core (12) comprises a matching portion (122) matching with the half mold, and the mounting portion (121), wherein the diameter of the mounting portion (121) is smaller than that of the matching portion (122), thereby forming a step for positioning the insert (3) between the mounting portion (121) and the matching portion (122).

8. The insert locking device of the automobile motor end cover mold according to claim 7, characterized in that: The matching portion (122) has a side protrusion (123), and a mounting hole (124) for mounting the rotating shaft (13) extends from the side protrusion (123) toward the mounting portion (121).

9. The insert locking device of the automobile motor end cover mold according to claim 7, characterized in that: The matching portion (122) is provided with a fixing ear (125) for fixing with the half mold.

10. The insert locking device of the automobile motor end cover mold according to claim 9, characterized in that: Four fixing ears (125) are evenly spaced apart on the matching portion (122).

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