Motor housing cover of driving mechanism and driving mechanism using same

Abstract

The present invention relates to a motor housing cover which, in order to precisely set the offset of a reducer and prevent oil leakage from the reducer, comprises: a reducer housing fastening hole formed in a flange of the motor housing cover to enable fastening to a reducer housing; a motor shaft through-hole formed through the center of the motor housing cover; a concave portion formed on a motor side around the motor shaft through-hole; and an outer cylindrical protrusion portion formed on a reducer side, wherein formed on the motor side of the motor housing cover are: a motor housing fastening hole having female threads formed to enable fastening to a motor housing; a thrust bearing installation portion for installing a thrust bearing capable of supporting thrust acting on a motor shaft; a radial bearing installation portion for installing a radial bearing capable of supporting a radial load acting on the motor shaft; a positioning pin insertion hole for determining a position of the reducer housing by means of a position determination relative to the motor housing, and wherein formed on the reducer side of the motor housing cover is an oil leakage prevention packing installation groove extending along the entire circumference in the radial direction between the outer cylindrical protrusion portion and the flange.

Description

Motor housing cover of the driving mechanism and the driving mechanism used therein

[0001] The present invention relates to a motor housing cover used as a driving mechanism for large trucks, agricultural machinery, construction machinery, and defense equipment, and more specifically, to a motor housing cover configured to improve the precision of coupling between a motor and a reducer having a built-in spiral bevel gear or hypoid gear, while increasing the airtightness of the reducer housing, and also to serve as a motor output shaft fixing body.

[0002] Hypoid gears are typically used as reduction mechanisms in rear axle reducers for large trucks because they can transmit more torque and achieve higher reduction ratios through greater contact area and higher tooth strength. Despite these advantages, hypoid gears require adequate lubrication due to the difference in helical angle between the pinion and crown (larger gear), which causes some sliding along the teeth.

[0003] Accordingly, a reducer that adopts a hypoid gear has oil inside the reducer housing, and therefore requires an appropriate seal structure to prevent oil leakage inside the housing.

[0004] In addition, the pinion and crown gear of the hypoid gear are offset from each other so that their axes do not intersect and are not parallel, and therefore, appropriate adjustment of the offset is required.

[0005] Fig. 1 is an axial cross-sectional view of a motor and reducer including a conventional motor housing cover, and Fig. 2 is an exploded cross-sectional view showing a positioning structure of a conventional motor and reducer.

[0006] The reducer using the hypoid gear illustrated in Fig. 1 is used by connecting the motor (1) and the reducer (2) as one unit. The motor has a motor shaft (8) and a housing (3), and a pinion (12) of the hypoid gear is attached to the front end of the motor shaft. The motor housing (3) is used by arranging a rear end bracket at the rear end of the cylindrical housing, arranging a front end cover (5) at the front end, and then connecting them with a through bolt (4).

[0007] Meanwhile, a cylindrical protrusion (5b) having an outer diameter D1 is formed on the front end cover (5) toward the reducer, and the cylindrical protrusion has an outer diameter D1 that forms a concentric circle with the motor shaft, and the cylindrical protrusion of the outer diameter D1 is formed with the same dimensions as a circular through hole having an inner diameter D2 formed in the member (2a) of the reducer housing (7). The motor shaft (8) is supported by a bearing (9) so as to be free to rotate, and an oil seal (seal, 11) is mounted between the motor shaft (8) adjacent to the hypoid pinion side of the bearing and the front end cover (5) of the motor.

[0008] The reducer housing (7) is composed of a pair of housing members (2a) that are divided into two to facilitate installation of a gear train and are joined together with bolts or the like. When the pair of divided housing members are combined, a circular through hole with an inner diameter of D2 is formed.

[0009] The conventional reducer illustrated in FIGS. 1 and 2 determines the positions of the motor housing and the reducer housing by inserting a cylindrical protrusion (5b) formed on the motor tip cover (5) into a circular through hole formed when a pair of housing members (2a) constituting the reducer housing are aligned.

[0010] However, in order to precisely adjust the offset (a) of the pinion (12) and crown gear (13) of the hypoid gear by using the positioning structure of the motor housing (3) and the reducer housing (7), it is necessary to temporarily assemble a pair of housing members (2a) constituting the reducer housing and then simultaneously machine a circular through-hole, which increases the machining process and causes problems in mass production. In addition, there is a limit to reducing the tolerance with only the precise machining of the cylindrical protrusion (5b) formed on the front end cover (5) of the motor and the circular through-hole formed on the reducer housing, so there is a problem in precisely adjusting the offset (a).

[0011] In addition, the conventional reducer has an oil seal (seal, 1l) installed between the motor shaft (8) adjacent to the hypoid pinion (12) side of the bearing and the front end cover (5) of the motor to prevent oil leakage, but there was a problem in that it was difficult to sufficiently prevent oil leakage when the seal was damaged due to external impact, etc., or when the seal was deformed due to the inflow of impurities.

[0012] Patent Registration No. 10-0529864 (published on November 22, 2005)

[0013] Patent Registration No. 10-1505414 (Published on March 26, 2015)

[0014] Japanese Patent Publication No. 6316072 (published on April 25, 2018)

[0015] The present invention, taking into account the above-mentioned problems, aims to provide a motor housing cover of a driving mechanism capable of adjusting the offset of a reducer gear by accurately determining the positions of a motor housing and a reducer housing, while preventing oil leakage from a reducer due to damage to an oil seal, etc.

[0016] The motor housing front end cover of the present invention is a motor housing cover of a driving mechanism that functions as a fixture that connects the housing of the motor and the housing of the reducer and fixes the output shaft of the motor in a driving mechanism in which a motor and a reducer are combined and operated, and the motor housing cover includes a reducer housing fastening hole formed in a flange of the motor housing cover so as to be fastened with the reducer housing, a motor shaft through-hole formed through the center of the motor housing cover, a concave portion formed on the motor side centered on the motor shaft through-hole, and a cylindrical protrusion formed on the reducer side, wherein on the motor side of the motor housing cover, a motor housing fastening hole having a female screw formed therein so as to be fastened with the motor housing, a thrust bearing installation portion for installing a thrust bearing capable of supporting a thrust applied to the motor shaft, a radial bearing installation portion for installing a radial bearing capable of supporting a radial load applied to the motor shaft, and a positioning pin insertion hole for determining the position of the reducer housing through positioning with the motor housing are formed, and the motor housing cover On the reducer side, a concave oil leakage prevention packing installation groove is formed in the width direction of the motor housing cover between the outer cylindrical protrusion that becomes the fitting portion of the motor housing cover and the reducer housing and the flange.

[0017] As one embodiment, the present invention is characterized in that the motor housing cover further includes a positioning pin integrally coupled to the positioning pin insertion hole.

[0018] As one embodiment, the present invention is characterized in that the outer diameter concentricity tolerance of the positioning pin insertion hole of the motor housing cover and the positioning pin is 0.005 mm or less.

[0019] As one embodiment, the motor housing cover of the present invention is characterized in that a liquid packing installation groove is further formed on the outer periphery of the outer cylindrical protrusion and / or on the flat surface between the outer cylindrical protrusion and the inner cylindrical protrusion, which are fitted with the reducer housing.

[0020] In one embodiment, the present invention comprises a reducer housing fastening hole formed in a flange of a motor housing cover so as to enable fastening with a reducer housing, a motor shaft through-hole formed through the center of the motor housing cover, a concave portion formed on the motor side centered on the motor shaft through-hole, and a cylindrical protrusion formed on the reducer side, wherein, on the motor side of the motor housing cover, a motor housing fastening hole having a female screw formed therein so as to enable coupling with the motor housing, a thrust bearing installation portion for installing a thrust bearing capable of supporting a thrust applied to the motor shaft, a radial bearing installation portion for installing a radial bearing capable of supporting a radial load applied to the motor shaft, and a positioning pin insertion hole for determining the position of the reducer housing through positioning with respect to the motor housing are formed, and on the reducer side of the motor housing cover, an outer cylindrical protrusion that becomes a fitting portion of the motor housing cover and the reducer housing and a concave oil leakage prevention packing installation groove formed in the width direction of the motor housing cover are used. It is characterized by combining the motor housing and the reducer housing of the driving mechanism.

[0021] In addition, as one embodiment, the present invention is characterized in that, when combining a motor housing and a reducer housing using a motor housing cover, a positioning pin is inserted into the positioning pin insertion hole so that an offset of a gear shaft built into the reducer can be accurately adjusted, thereby determining the position of the motor housing and the motor housing cover, thereby determining the position of the reducer housing, and then combining the motor housing and the reducer housing.

[0022] The present invention is configured such that a positioning pin insertion hole capable of determining the positions of a motor housing and a reducer housing is provided in a motor housing cover, and when assembling the motor housing and the reducer housing, the positioning pin is inserted into the motor housing cover to assemble the motor housing and the motor housing cover, and then assembled with the reducer housing, so that the precision of assembly can be increased without precision machining an outer cylindrical protrusion that becomes a fitting portion of the motor housing cover and the reducer housing cover, thereby enabling precise adjustment of an offset of a hypoid gear inside a reducer and suppressing the occurrence of a gap that causes reducer oil to leak.

[0023] In addition, the present invention has an effect of preventing oil leakage from the reducer by providing a concave oil leakage prevention packing installation groove in the width direction between the outer cylindrical protrusion and the flange on the reducer side of the motor housing cover, and a liquid packing installation groove on the outer periphery of the outer cylindrical protrusion that becomes the fitting portion of the motor housing cover and the reducer housing cover and / or on the flat surface between the outer cylindrical protrusion and the inner cylindrical protrusion.

[0024] Figure 1 is an axial cross-sectional view of a motor and reducer including a conventional motor housing cover.

[0025] Fig. 2 is an exploded cross-sectional view showing the positioning structure of a conventional motor and reducer.

[0026] Fig. 3 is an actual photograph of a driving mechanism including a motor housing cover of the present invention.

[0027] Figure 4 is a plan view and a cross-sectional view of the motor housing cover of the present invention.

[0028] Fig. 5 is an axial cross-sectional view of a motor housing and a reducer housing including a motor housing cover of the present invention.

[0029] The terms used in this application are used only to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0030] In this application, the terms “include” or “have” are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0031] In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

[0032] Hereinafter, preferred embodiments for achieving the purpose of the present invention will be described with reference to the drawings attached to the present invention.

[0033] Fig. 3 is an actual photograph of a driving mechanism including a motor housing cover of the present invention, Fig. 4 is a plan view and a cross-sectional view of a motor housing cover of the present invention, and Fig. 5 is an axial half-sectional view of a motor housing and a reducer housing including a motor housing cover of the present invention.

[0034] Referring to FIGS. 3 to 5, a motor housing cover (50) according to the present invention is a member that is disposed at a connection portion between a motor housing (19) and a reducer housing (29), i.e., at the front end of the motor housing (19), and connects the motor housing (19) and the reducer housing (29). The motor housing cover (50) is formed by a cover body having a substantially circular shape, a flange (52) extending outward from the cover body, and a flange extension portion (53) having a substantially rectangular shape that extends integrally from the flange (52). The rectangular flange extension portion (53) has a rectangular long side that is longer than the diameter of the circular housing body and a short side that is shorter than the diameter of the circular housing body. A portion of the flange (52) may be formed in a partially cut form for consistency with the joining portion.

[0035] The above flange (52) is formed to extend to the body in a double-stepped shape in the direction in which the motor housing cover (50) is coupled to the motor housing (19), and hereinafter, the flange (52) and the flange extension (53) are collectively referred to as the flange (52) except in cases where it is necessary to specifically distinguish between them.

[0036] The motor housing cover (50) has a reducer housing fastening hole (54) for fastening with the reducer housing (29), a motor shaft through-hole (56) penetrating the center of the motor housing cover (50), a concave portion (60) on the motor (10) side centered on the motor shaft through-hole (56), a hollow cylindrical protrusion (63) formed within the concave portion (60), and an internal concave portion (61) formed concentrically inside the hollow cylindrical protrusion (63), and further, an outer cylindrical protrusion (70) on the reducer (20) side, and an inner cylindrical protrusion (71) that protrudes more than the outer cylindrical protrusion (70), has a smaller diameter, and has a center that is penetrated.

[0037] The above reducer housing fastening hole (54) is formed in the flange (52) of the motor housing cover (50) to enable fastening with the reducer housing (29), and is formed in approximately four locations for stable fixing. When assembling, a bolt passes through the reducer housing fastening hole (54) from the motor (10) side and is inserted into the reducer housing (29).

[0038] On the motor (10) side of the motor housing cover (50), a motor housing fastening hole (55) for coupling with the motor housing (19), a thrust bearing installation part (64) for installing a thrust bearing capable of supporting a thrust applied to the motor shaft (80), a radial bearing installation part (65) for installing a radial bearing capable of supporting a radial load applied to the motor shaft (80), and a positioning pin insertion hole (57) for determining the position of the reducer housing (29) through positioning with respect to the motor housing (19) are formed.

[0039] The above motor housing fastening hole (55) is a hole into which a bolt for fastening the motor housing cover (50) and the motor housing (19) is fastened, and is formed in a projection protruding toward the center within the concave portion (60) on the motor (10) side, and is formed in approximately four places for stable fixing, and a female screw is formed inside the fastening hole, so that when assembling, a bolt inserted from the motor housing (19) side is fastened to the female screw formed in the motor housing fastening hole (55).

[0040] The number of the above reducer housing fastening holes (54) and the above motor housing fastening holes (55) can be changed and used as needed.

[0041] The thrust bearing installation part (64) for installing the thrust bearing is formed in the concave part (60) on the motor (10) side so as to support the thrust applied to the motor shaft (80), and its outer diameter is formed to be a size that contacts the protrusion within the concave part (60), and its inner diameter is formed to be the same size as the outer diameter of the hollow cylindrical protrusion (63) formed within the concave part (60).

[0042] The radial bearing installation part (65) for the above radial bearing installation is a part for supporting the radial load of the motor shaft (80), and is formed with an outer diameter the same size as the inner diameter of the hollow cylindrical protrusion (63) within the concave part (60) so that the inner concave part (61) formed in a circular shape within the concave part (60) on the motor (10) side can bear the load.

[0043] The above positioning pin insertion hole (57) is a hole into which a positioning pin (58) is inserted for determining the positional relationship between the two components when combining the motor housing (19) and the motor housing cover (50), and at least one of the positioning pins is formed between the concentric circles formed by the motor housing fastening hole (55) and the reducer housing fastening hole (54) on the motor (10) side of the motor housing cover (50), and the processing precision thereof is adjusted to a degree that the offset of the hypoid gear inside the reducer (20) can be precisely adjusted through determining the positional relationship between the motor housing (19) and the reducer housing (29) to be described later, but it is preferable that the concentricity of the outer diameter be 0.005 mm or less in order to increase the precision of the offset.

[0044] Meanwhile, the offset precision of the hypoid gear inside the reducer (20) is determined by setting the positional relationship between the motor housing (19) and the reducer housing (29). In the present invention, the positional relationship setting is performed through the motor housing cover (50) connecting the motor housing (19) and the reducer housing (29). In order to set this, when the motor housing cover (50) is coupled to the motor housing (19) prior to coupling the motor housing (19) and the reducer housing (29), the positional relationship can be set by inserting a positioning pin (58) into the positioning pin insertion hole (57).

[0045]

[0046] The outer cylindrical protrusion (70) on the reducer (20) side of the motor housing cover (50) is formed to be concentric with the motor shaft (80) and is sized to fit into a circular concave portion (62) formed on the reducer housing (29) formed by combining a pair of housing members, and the inner cylindrical protrusion (71) on the reducer (20) side of the motor housing cover (50) is formed to be smaller in diameter than the outer cylindrical protrusion (70) and has a center that penetrates to form a concentric circle with the motor shaft (80) and is sized to fit into a circular through-hole portion formed on the reducer housing (29) formed by combining a pair of housing members.

[0047] The reducer housing (29) is generally composed of a pair of housing members divided into two so that components such as a reduction gear can be easily mounted therein. The pair of housing members are combined to form the reducer housing (29). When the pair of divided housing members are combined, a circular concave portion (62) into which the outer cylindrical protrusion (70) on the reducer (20) side of the motor housing cover (50) is fitted and / or a circular through hole into which the inner cylindrical protrusion (71) on the reducer (20) side of the motor housing cover (50) is fitted is formed.

[0048] In the present invention, the outer cylindrical protrusion (70) and the inner cylindrical protrusion (71) are configured in a stepped manner, but the inner cylindrical protrusion (71) may be omitted, and in this case, it is sufficient for only a circular through hole to which the outer cylindrical protrusion (70) can be fitted to be formed in the reducer housing (29).

[0049] Meanwhile, a concave oil leak prevention packing installation groove (72) is formed between the outer cylindrical protrusion (70) and the flange (52) on the reducer (20) side of the motor housing cover (50). The oil leak prevention packing installation groove (72) is a groove for installing an oil leak prevention packing so that oil inside the reducer (20) can be prevented from leaking to the outside when the motor housing (19) and the reducer housing (29) are combined after the outer cylindrical protrusion (70) is fitted into the circular through-hole or circular concave portion (62) of the reducer housing (29).

[0050] The above oil leak prevention packing may be deformed due to external impact or inflow of foreign substances, so in the present invention, in order to more reliably prevent oil leakage, in addition to the oil leak prevention packing installation groove (72), a liquid packing installation groove (73) for installing liquid packing is further provided on the outer periphery of the outer cylindrical protrusion (70) and / or the flat surface (75) between the outer cylindrical protrusion and the inner cylindrical protrusion.

[0051] The above oil leak prevention packing may be deformed due to external impact or inflow of foreign substances, so in the present invention, in order to more reliably prevent oil leakage, in addition to the oil leak prevention packing installation groove (72), a liquid packing installation groove (73) for installing liquid packing is further provided on the outer periphery of the outer cylindrical protrusion (70) and / or the flat surface (75) between the outer cylindrical protrusion and the inner cylindrical protrusion.

[0052] That is, as shown in FIG. 5, when the outer cylindrical protrusion (70) and the inner cylindrical protrusion (71) formed on the reducer (20) side of the motor housing cover (50) are combined with the circular concave portion (62) and the circular through-portion formed on the reducer housing, respectively, a liquid packing installation groove (73) for installing liquid packing is provided on the outer periphery of the outer cylindrical protrusion (70) or on the flat portion (75) between the outer cylindrical protrusion and the inner cylindrical protrusion, and when the outer cylindrical protrusion (70) and the inner cylindrical protrusion formed on the reducer (20) side of the motor housing cover (50) do not have a step, a liquid packing installation groove (73) for installing liquid packing is provided on the outer periphery of the outer cylindrical protrusion (70).

[0053] By configuring as above, when the outer cylindrical protrusion (70) and / or the inner cylindrical protrusion (71) are fitted into the circular through-hole and / or the circular recess (62) of the reducer housing (29), the opposing surfaces between the outer cylindrical protrusion (70) and / or the inner cylindrical protrusion (71) and the circular through-hole and / or the circular recess (62) of the reducer housing (29) can be sealed by the liquid packing filled in the liquid packing installation groove (73), and at the same time, the liquid packing can be maintained for a long period of time. Through this, it is possible to prevent oil inside the reducer (20) from leaking out to the outside.

[0054] In this type of coupling structure, the motor shaft (80) extends to the reducer housing (29) through the motor shaft through-hole (56) formed in the above-described motor housing cover (50), and the pinion of the hypoid gear is attached to the tip thereof, and can rotate freely with the support of the thrust bearing and the radial bearing on the motor (10) side of the motor housing cover (50). Since the motor shaft (80) is sealed by an oil seal arranged in the stepped portion between the central through-hole (74) of the cylindrical protrusion (70, 71) formed on the reducer (20) side of the motor housing cover (50) and the motor shaft through-hole (56), the oil inside the reducer (20) is also prevented from leaking into the motor housing (19).

[0055]

[0056] As described above, in the present invention, not only is the offset of the gear shaft built into the reducer (20) accurately adjusted by setting a precise positional relationship by using the positioning pin (58), but also the gap where oil may leak inside the reducer (20) is suppressed, and oil leakage inside the reducer (20) due to installation of various seals is fundamentally blocked, so that the effect of preventing a breakdown of the reducer (20) in advance is generated.

[0057]

[0058] In combining the motor housing (19) and the reducer housing (29) using the motor housing cover (50) of the present invention, the motor housing cover (50) is positioned between the motor housing (19) and the reducer housing (29). At this time, in order to accurately adjust the offset of the gear shaft built into the reducer (20), the positioning pin (58) described above is inserted into the positioning pin insertion hole (57) formed in the motor housing cover (50) to determine the positions of the motor housing (19) and the motor housing cover (50), and then the motor housing (19) and the motor housing cover (50) are combined, and thereafter, the positions of the motor housing (19) and the reducer housing (29) are determined so that the motor housing (19) and the reducer housing (29) are combined.

[0059]

[0060] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom, and therefore the true technical scope of the present invention should be determined by the technical idea of ​​the appended claims.

[0061] 10: Motor 20: Reducer

[0062] 19: Motor housing 29: Reducer housing

[0063] 50: Motor housing cover 51: Body

[0064] 52: Flange 53: Flange extension

[0065] 54: Hole for fastening the reducer housing 55: Hole for fastening the motor housing

[0066] 56: Motor shaft through hole 57: Positioning pin insertion hole

[0067] 58: Positioning pin

[0068] 60: concave 61: inner concave

[0069] 62: Circular recess 63: Hollow cylindrical protrusion

[0070] 64: Thrust bearing installation part 65: Radial bearing installation part

[0071] 70: Outer cylindrical protrusion 71: Inner cylindrical protrusion

[0072] 72: Oil leak prevention packing installation groove

[0073] 73: Liquid packing installation groove 74: Cylindrical protrusion central through hole

[0074] 75: Flat surface 80: Motor shaft

Claims

1. As a motor housing cover of a driving mechanism in which a motor and a reducer are combined to operate. The above motor housing cover is placed at the connection part of the motor housing and the reducer housing. In the above motor housing cover, A reducer housing fixing hole formed in the flange of the motor housing cover so as to enable fixation with the reducer housing, a motor shaft through hole formed through the center of the motor housing cover, a concave portion formed on the motor side centered on the motor shaft through hole, and an outer cylindrical protrusion formed on the reducer side are included. Also, on the motor side of the above motor housing cover, A motor housing fastening hole having a female screw formed therein to enable combination with the motor housing, a thrust bearing installation portion for installing a thrust bearing capable of supporting a thrust applied to the motor shaft, a radial bearing installation portion for installing a radial bearing capable of supporting a radial load applied to the motor shaft, and a positioning pin insertion hole for determining the position of the reducer housing through positioning with respect to the motor housing are formed. On the reducer side of the above motor housing cover, A motor housing cover characterized in that an oil leakage prevention packing installation groove is formed over the entire circumference in the width direction between the outer cylindrical protrusion and the flange.

2. In claim 1 The above motor housing cover, A motor housing cover characterized by further including a positioning pin inserted into a positioning pin insertion hole.

3. In claim 2 A motor housing cover characterized in that the outer diameter concentricity tolerance of the positioning pin insertion hole of the above motor housing cover and the positioning pin is 0.005 mm or less.

4. A driving mechanism in which the motor housing cover of claim 1 is used as a component for joining the motor housing and the reducer housing.

5. A method of combining the motor housing and the reducer housing using the motor housing cover of claim 2. A method for combining a motor housing and a reducer housing, characterized in that the positions of the motor housing and the motor housing cover are determined by inserting the positioning pin into the positioning pin insertion hole so that the offset of the gear shaft included in the reducer can be accurately adjusted, thereby determining the positions of the motor housing and the reducer housing, and then combining the motor housing and the reducer housing.

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