unit

Abstract

[Problem] To reduce the step ratio during gear shifting in a unit having a motive power transmission mechanism therein. [Solution] This unit comprises: an input element; an output element; and a gear device that is configured by coupling a first planetary gear mechanism and a second planetary gear mechanism to respective rotating elements at one location, the gear device being such that, on a collinear diagram, a second rotation part is disposed between a first rotation part and a third rotation part that are the coupled respective rotational elements, and a fifth rotation part is disposed between the first rotation part and a fourth rotation part. The input element is connected to the first rotation part. The output element is connected to the fifth rotation part. The third rotation part is fixed in place. The fourth rotation part can be selectively connected to a fixed element or the second rotation part. Any specific two of the first rotation part, the fourth rotation part, and the fifth rotation part can be connected to and disconnected from each other.

Description

[Technical Field]

[0001] The present invention relates to a unit having a power transmission mechanism therein. [Background technology]

[0002] Patent Document 1 discloses a two-speed automatic transmission unit for an electric vehicle, which can achieve first speed and second speed, which has a smaller gear ratio (= input rotation speed / output rotation speed) than first speed, by switching the engagement state of two friction clutches.

[0003] Similar units are also disclosed in Patent Documents 2 to 4. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] German Patent Application Publication No. 102019116360 [Patent Document 2] German Patent Application Publication No. 102019119951 [Patent Document 3] Chinese Patent No. 106195194 [Patent Document 4] Chinese Utility Model No. 206000959 Summary of the Invention [Problem to be solved by the invention]

[0005] In an automatic transmission unit for an electric vehicle with two forward speeds, the larger the first-speed gear ratio, the greater the torque amplification effect due to deceleration, so the larger the first-speed gear ratio, the smaller the maximum torque of the motor can be, allowing a smaller motor to be selected.In contrast, the smaller the second-speed gear ratio, the lower the motor rotation speed when achieving a certain vehicle speed, which is advantageous for high-speed cruising.

[0006] However, if the gear ratios for first and second gears are set based on the above design concept, the gear ratio (= gear ratio for first gear / gear ratio for second gear) when switching between first and second gears becomes large, resulting in a large gear shift shock.

[0007] The present invention has been made in view of these technical problems, and has as its object to reduce the gear ratio during gear change in a unit having a power transmission mechanism therein. [Means for solving the problem]

[0008] According to one aspect of the present invention, An input element; An output element; a gear device configured by coupling rotational elements of a first planetary gear mechanism and a second planetary gear mechanism at one location, wherein, on a nomographic diagram, a second rotational portion is disposed between the first rotational portion and the third rotational portion, which are the coupled rotational elements, and a fifth rotational portion is disposed between the first rotational portion and the fourth rotational portion; Equipped with the input element is connected to the first rotation portion; the output element is connected to the fifth rotational portion; the third rotational portion is fixed; the fourth rotating portion is selectively connectable to a fixed element or the second rotating portion; Any two of the first rotating portion, the fourth rotating portion, and the fifth rotating portion can be connected and disconnected from each other. Units are provided. [Effects of the Invention]

[0009] According to the above aspect, two gears can be achieved by switching the connection of the fourth rotating portion. Furthermore, by connecting any two specific rotational portions among the first rotating portion, the fourth rotating portion, and the fifth rotating portion, the first rotating portion, the fourth rotating portion, and the fifth rotating portion can be rotated integrally, thereby achieving a gear with a gear ratio of 1. In other words, three gears can be achieved. Since the inter-gear ratio is small, an appropriate gear ratio can be set depending on the speed range. Furthermore, since the gear ratio is 1 in third gear, power transmission loss due to differential rotation between the rotating portions can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a skeleton diagram of a unit according to an embodiment of the present invention. [Figure 2] FIG. 2 is an engagement table showing the engagement state of each engagement element at each gear position. [Figure 3] Figure 3 is a collinear diagram of the unit. [Figure 4] FIG. 4 is a skeleton diagram of a modified example. [Figure 5A] FIG. 5A is a skeleton diagram of a modified example. [Figure 5B] FIG. 5B is a collinear diagram of the modified example. [Figure 6A] FIG. 6A is a skeleton diagram of a modified example. [Figure 6B] FIG. 6B is a collinear diagram of the modified example. [Figure 7A] FIG. 7A is a skeleton diagram of a modified example. [Figure 7B] FIG. 7B is a collinear diagram of the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The definitions of terms used in this specification are as follows.

[0012] "Unit" refers to a device in general that has a power transmission mechanism such as a gear mechanism or a differential gear mechanism inside, and includes a motor unit having a motor and a power transmission mechanism, an automatic transmission unit, a reducer unit, etc.

[0013] The "gear ratio" is the value obtained by dividing the input rotation speed of a unit by the output rotation speed. "Input rotation" includes not only the rotation input to the unit from a power source outside the unit, but also the rotation input to the unit from a power source inside the unit.

[0014] The "gear ratio" is the value obtained by dividing the larger (low speed) gear ratio by the smaller (high speed) gear ratio of the two gear ratios realized by the unit.

[0015] "Axial direction" refers to the axial direction of the rotating shaft of the parts that make up the unit. The parts are motors, gear mechanisms, differential gear mechanisms, etc. "Radial direction" refers to the radial direction from the central axis of the rotating shaft.

[0016] "Housing" refers to a container that houses the motor, inverter, and power transmission mechanism, and is composed of one or more cases. An embodiment in which the case that houses the motor, the case that houses the inverter, and the case that houses the power transmission mechanism are integrally formed is called "3-in-1."

[0017] The term "motor" refers to a rotating electric machine having a motor function, and may have a generator function in addition to the motor function.

[0018] "Element A is connected to element B" means that element A is connected to element B upstream or downstream in a manner that allows power transmission between element A and element B. The power input side is upstream, and the power output side is downstream. Element A is not limited to being connected to element B directly or via another member, and may be connected via a clutch or the like.

[0019] "Element A is connected to element B" means that element A and element B are connected directly or indirectly via other members, and that element A and element B are integrated. In other words, it can also be said that element A and element B rotate as a unit. It also means that element A and element B are connected without a brake or clutch, and can be said to be a state in which element A and element B are always connected.

[0020] "Element A is fixed to element B" includes both a state in which element A is directly fixed to element B and a state in which element A is fixed to element B via an element C other than elements A and B. "Element A is fixed" means a state in which element A is fixed to another element and cannot rotate.

[0021] "Element A and element B overlap when viewed in a specified direction" refers to a state in which element A and element B are aligned in a specified direction (axial direction, radial direction, gravity direction, etc.) and at least partially overlap when observed from the specified direction. This is synonymous with "element A and element B overlap in a specified direction." When element A and element B overlap when viewed in the axial direction, element A and element B are coaxial. When element A and element B are drawn aligned in a specified direction in a drawing, this means that element A and element B overlap when viewed in the specified direction.

[0022] In contrast, "element A and element B do not overlap when viewed in a specified direction" refers to a state in which element A and element B are not aligned in a specified direction (axial direction, radial direction, gravity direction, vehicle running direction, etc.), and there is no overlapping portion between element A and element B when observed from the specified direction. This is synonymous with "element A and element B do not overlap in a specified direction." When element A and element B are depicted in a drawing so that they are not aligned in a specified direction, this means that element A and element B do not overlap when viewed in the specified direction.

[0023] "Element A is disposed between element B and element C when viewed in a predetermined direction" means that element A is observed to be between element B and element C when viewed from a predetermined direction (axial direction, radial direction, gravity direction, etc.). For example, if elements B, A, and C are lined up in this order along the axial direction, element A is observed to be between element B and element C when viewed in the radial direction, and therefore element A can be said to be located between element B and element C. Element A does not need to overlap with elements B and C when viewed in the axial direction. When element A is depicted between element B and element C in a drawing, this means that element A is located between element B and element C when viewed in the predetermined direction.

[0024] "Element A is arranged axially outside element B" means that element A is arranged on one axial side or the other axial side of element B, and includes not only the case where element A and element B overlap when viewed in the axial direction, but also the case where element A and element B are positioned differently in the radial direction and therefore do not overlap.

[0025] "Element A is positioned radially outside (or inside) element B" means that the radial position of element A is outside (or inside) the radial position of element B, and includes not only the case where element A and element B overlap when viewed radially, but also the case where element A and element B do not overlap because their axial positions are different.

[0026] "Disposed closely together" means that two elements have an overlapping portion when viewed in the axial direction or the radial direction, and no other elements are sandwiched between the two elements. For example, "two engaging elements are disposed closely together" means that a planetary gear mechanism or the like is not disposed between the two engaging elements. If no other elements are depicted between element A and element B in the drawing, this means that element A and element B are disposed closely together.

[0027] "One side of the engaging element" and "the other side of the engaging element" refer to two elements included in the engaging element that are unable to rotate relative to each other when the engaging element is in an engaged state and are able to rotate relative to each other when the engaging element is in a released state. "One side of the engaging element" and "the other side of the engaging element" may be a combination of rotating elements, or a combination of a rotating element and a non-rotating element; the former is generally called a clutch and the latter is generally called a brake. Also, "one side of the engaging element" means either "one side of the engaging element" or "the other side of the engaging element."

[0028] Other terms will be defined as appropriate throughout the specification.

[0029] FIG. 1 is a skeleton diagram showing the basic structure of a unit 100 according to an embodiment of the present invention. The unit 100 is a three-speed forward automatic transmission unit for an electric vehicle that changes the speed of rotation input to an input element IN from a motor (not shown) as a power source at a gear ratio corresponding to the gear position and transmits the rotation from an output element OUT to drive wheels (not shown). The input element IN and output element OUT are each composed of gears, a rotating shaft, etc. The motor can be switched between forward and reverse rotation, so the unit 100 does not have a reverse gear, which clearly differentiates the design concept from units for vehicles that use an internal combustion engine as a power source.

[0030] The unit 100 is a so-called 3-in-1 unit that accommodates an input element IN, a gear device 2, first to third engagement elements CL1, CL2, B1, an output element OUT, and a motor and inverter (not shown) within a housing 1. The housing 1 is fixed to the vehicle so as not to be rotatable.

[0031] One end of the input element IN is connected to the output shaft of the motor, and the input element IN rotates due to the power input from the motor. The rotational speed of the input element IN is the input rotational speed of the unit 100. The motor is electrically connected to a battery (not shown) outside the unit 100 via an inverter, and receives power from the battery to function as an electric motor. The motor can also function as a generator.

[0032] The gear device 2 is configured by connecting the rotational elements of a first planetary gear mechanism PG1 and a second planetary gear mechanism PG2 at one location.

[0033] The first planetary gear mechanism PG1 is a single-pinion planetary gear mechanism having a first sun gear S1 as a first rotating element, a plurality of first pinion gears (not shown), a first carrier C1 as a second rotating element that rotatably supports the plurality of first pinion gears, and a first ring gear R1 as a third rotating element. The first sun gear S1 meshes with the plurality of first pinion gears, and the plurality of first pinion gears mesh with the first ring gear R1.

[0034] The second planetary gear mechanism PG2 is a single-pinion planetary gear mechanism including a second sun gear S2 as a sixth rotating element, a plurality of second pinion gears (not shown), a second carrier C2 as a fifth rotating element that rotatably supports the second pinion gears, and a second ring gear R2 as a fourth rotating element. The second sun gear S2 meshes with the second pinion gears, and the second pinion gears mesh with the second ring gear R2.

[0035] In the diagram, the "S" in parentheses next to the symbols PG1 and PG2 indicates that the planetary gear mechanism is a single-pinion planetary gear mechanism. If the planetary gear mechanism is a double-pinion planetary gear mechanism, the "D" in parentheses is placed next to PG1 and PG2.

[0036] The first sun gear S1 is coupled to the second sun gear S2. By coupling the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 at one location in this manner, a first rotating portion P1 is formed by the first sun gear S1 and the second sun gear S2, a second rotating portion P2 is formed by the first carrier C1, a third rotating portion P3 is formed by the first ring gear R1, a fourth rotating portion P4 is formed by the second ring gear R2, and a fifth rotating portion P5 is formed by the second carrier C2.

[0037] The first rotating part P1 is connected to the input element IN. The fifth rotating part P5 is connected to the output element OUT. The third rotating part P3 is fixed to the housing 1 as a fixed element.

[0038] The rotational speed of the output element OUT is the output rotational speed of the unit 100 .

[0039] The first engaging element CL1 is a hydraulic or electric clutch. If we define the two portions of the first engaging element CL1 that are engaged when the first engaging element CL1 is engaged as one side and the other side, one side is connected to a fourth rotational portion P4 formed by the second ring gear R2, and the other side is connected to a first rotational portion P1 formed by the first sun gear S1 and the second sun gear S2. As a result, when the first engaging element CL1 is engaged, the fourth rotational portion P4 formed by the second ring gear R2 can be connected to the first rotational portion P1 formed by the first sun gear S1 and the second sun gear S2.

[0040] The second engagement element CL2 is a hydraulic or electric clutch. If we define the two portions of the second engagement element CL2 that are engaged when the second engagement element CL2 is engaged as one side and the other side, one side is connected to the second rotational portion P2 formed by the first carrier C1, and the other side is connected to the fourth rotational portion P4 formed by the second ring gear R2. As a result, when the second engagement element CL2 is engaged, the fourth rotational portion P4 formed by the second ring gear R2 can be connected to the second rotational portion P2 formed by the first carrier C1.

[0041] In this arrangement, the first engaging element CL1 and the second engaging element CL2 are arranged between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2, so it is preferable to use hydraulic actuators that supply hydraulic pressure from a control valve unit, which has fewer layout restrictions, as the actuator that drives the first engaging element CL1 and the actuator that drives the second engaging element CL2.

[0042] Furthermore, because one side of the first engaging element CL1 and the other side of the second engaging element CL2 are both connected to the fourth rotational region P4 and rotate integrally, they can be shared, i.e., configured as an integrated part. For example, if the first engaging element CL1 and the second engaging element CL2 are each configured as a multi-plate clutch in which multiple friction plates are arranged between a drum and a hub, they can be configured as an integrated part by forming the hub of one drum on the outer periphery of the other drum. This reduces the number of parts in the unit 100.

[0043] The third engagement element B1 is a hydraulic or electric brake. If we define the two portions of the third engagement element B1 that are engaged when the third engagement element B1 is in an engaged state as one side and the other side, one side is connected to a fourth rotational portion P4 formed by the second ring gear R2, and the other side is fixed to the housing 1. As a result, when the third engagement element B1 is engaged, the fourth rotational portion P4 formed by the second ring gear R2 can be fixed to the housing 1.

[0044] As the third engagement element B1, it is possible to employ either an actuator that is less subject to layout constraints or an actuator that is subject to layout constraints.

[0045] The third engagement element B1 may be configured as a selectable one-way clutch. A selectable one-way clutch is a clutch whose operating state can be switched by an electric actuator and which is configured as a pair of ratchet mechanisms that restrict rotation in different directions. When only one of the pair of ratchet mechanisms is operated, the clutch is in a one-way clutch state, and when both of the pair of ratchet mechanisms are operated, the clutch is in an engaged state.

[0046] By engaging one of the second engagement element CL2 and the third engagement element B1 and disengaging the other, the fourth rotational part P4 consisting of the second ring gear R2 can be selectively connected to the housing 1 as a fixed element or the second rotational part P2 consisting of the first carrier C1. Furthermore, by changing the engagement state (engagement / disengagement) of the first engagement element CL1, the first rotational part P1 consisting of the first sun gear S1 and the second sun gear S2 and the fourth rotational part P4 consisting of the second ring gear R2 can be switched between a disconnected state where they are disconnected from each other and a connected state where they are connected to each other. In other words, the first rotational part P1 and the fourth rotational part P4 can be connected and disconnected from each other (disconnection / connection).

[0047] When viewed in the axial direction, the first to third engaging elements CL1, CL2, B1 can be made to overlap with the gear device 2. When these are made to overlap, the radial dimension of the unit 100 can be reduced.

[0048] 2 is an engagement table showing the relationship between the engagement states of the first to third engagement elements CL1, CL2, B1 and the gear positions achieved in the unit 100. In the table, black circles indicate the engaged state, and no circles indicate the disengaged state.

[0049] As shown in the engagement table, first gear is achieved by engaging the third engagement element B1 and disengaging the first engagement element CL1 and the second engagement element CL2. Second gear is achieved by engaging the second engagement element CL2 and disengaging the first engagement element CL1 and the third engagement element B1. Third gear is achieved by engaging the first engagement element CL1 and disengaging the second engagement element CL2 and the third engagement element B1.

[0050] 3 is a nomogram of the unit 100. On the nomogram, the second rotation region P2 is disposed between the first rotation region P1 and the third rotation region P3, and the fifth rotation region P5 is disposed between the first rotation region P1 and the fourth rotation region P4.

[0051] The three vertical lines l1 to l3 of the first planetary gear mechanism PG1 indicate, from left to right, the first sun gear S1 constituting the first rotational region P1, the first carrier C1 constituting the second rotational region P2, and the first ring gear R1 constituting the third rotational region P3. The three vertical lines l4 to l6 of the second planetary gear mechanism PG2 indicate, from right to left, the second sun gear S2 constituting the first rotational region P1, the second carrier C2 constituting the fifth rotational region P5, and the second ring gear R2 constituting the fourth rotational region P4. For ease of understanding, FIG. 3 shows the vertical line l1 corresponding to the first sun gear S1 and the vertical line l4 corresponding to the second sun gear S2. However, because the first sun gear S1 and the second sun gear S2 are coupled to each other, the vertical lines l1 and l4 are actually the same vertical line.

[0052] The first planetary gear mechanism PG1 is a single-pinion planetary gear mechanism, so the first carrier C1 is disposed between the first sun gear S1 and the first ring gear R1. The second planetary gear mechanism PG2 is also a single-pinion planetary gear mechanism, so the second carrier C2 is disposed between the second sun gear S2 and the second ring gear R2.

[0053] Because input element IN is connected to first rotational portion P1, vertical lines l1 and l4 correspond to input element IN. As shown by the dashed lines in Figure 3, the rotational speed of first sun gear S1 and the rotational speed of second sun gear S2 are equal, so if the rotational speed of input element IN is rin, the rotational speed of first sun gear S1 and the rotational speed of second sun gear S2 are both rin.

[0054] The output element OUT is connected to the fifth rotation portion P5, so the vertical line 15 corresponds to the output element OUT.

[0055] The straight line L0 indicates the rotational speeds of the rotating parts P1 to P3 in the first planetary gear mechanism PG1. The input element IN is connected to the first rotating part P1, and the third rotating part P3 is fixed. Therefore, if the rotational speed of the input element IN is rin, the rotational speed of the second rotating part P2 is r1, which is the ordinate of the intersection of the straight line L0 and the vertical line l2. The spacing between the vertical lines in the first planetary gear mechanism PG1 is determined according to the gear ratio of the first planetary gear mechanism PG1 (number of teeth of the first sun gear S1 / number of teeth of the first ring gear R1).

[0056] Straight lines L1 to L3 indicate the rotational speeds of the rotating parts P1, P4, and P5 in the second planetary gear mechanism PG2, and correspond to the respective gear positions. The rotational speeds of the rotating parts P1, P4, and P5 in each gear position are represented by the ordinates of the intersections of the straight lines L1 to L3 corresponding to each gear position with the vertical lines 14 to 16. The spacing between the vertical lines in the second planetary gear mechanism PG2 is determined according to the gear ratio of the second planetary gear mechanism PG2 (number of teeth of second sun gear S2 / number of teeth of second ring gear R2).

[0057] In first gear, the third engagement element B1 is engaged, and the first engagement element CL1 and the second engagement element CL2 are disengaged. As a result, the rotational speed of the fourth rotational part P4 becomes zero. Therefore, if the rotational speed of the input element IN is rin, the line L1 corresponding to first gear becomes a line passing through point X1 (zero rotational speed) and point X4 (rotational speed rin). The rotational speed of the output element OUT is r2, which is the ordinate of the intersection of line L1 and vertical line l5. Therefore, the gear ratio in first gear is rin / r2.

[0058] In second gear, the second engagement element CL2 is engaged, and the first engagement element CL1 and the third engagement element B1 are disengaged. As a result, as shown by the dashed line in FIG. 3, the rotational speeds of the fourth rotational portion P4 and the second rotational portion P2 are equal. Therefore, if the rotational speed of the input element IN is rin, the line L2 corresponding to second gear is a line passing through point X2 (rotational speed r1) and point X4 (rotational speed rin). The rotational speed of the output element OUT is r3, which is the ordinate of the intersection of line L2 and vertical line l5. Therefore, the gear ratio in second gear is rin / r3. Because r3 is greater than r2, the gear ratio in second gear is smaller than the gear ratio in first gear.

[0059] In third gear, the first engagement element CL1 is engaged, and the second engagement element CL2 and the third engagement element B1 are disengaged. As a result, the rotational speeds of the first rotational portion P1, the fourth rotational portion P4, and the fifth rotational portion P5 are equal. Therefore, if the rotational speed of the input element IN is rin, the line L3 corresponding to third gear is a line with zero slope that passes through point X3 (rotational speed rin) and point X4 (rotational speed rin). Because the rotational speeds of the input element IN and the output element OUT are equal, the gear ratio in third gear is 1, which is smaller than the gear ratios of first and second gears.

[0060] The unit 100 of this embodiment has a configuration in which the second rotating part P2 can be separated from the second planetary gear mechanism PG2, and therefore two gear stages (first gear and second gear) can be achieved by selectively switching the connection destination of the fourth rotating part P4 between the second rotating part P2 and the housing 1. Furthermore, with the second rotating part P2 separated from the second planetary gear mechanism PG2, the rotating parts P1, P4, and P5 of the second planetary gear mechanism PG2 can be rotated integrally, so a gear stage (third gear) with a gear ratio of 1 can be achieved.

[0061] In this way, the unit 100 can achieve three gear stages, so the gear ratio is smaller than that of a unit with two forward speeds, and shock during gear changes can be kept smaller than that of a unit with two forward speeds. Also, since the first to third speeds can be used for low, medium, and high speeds, respectively, an appropriate gear ratio can be set according to the speed range.

[0062] Furthermore, in third gear, all of the rotating parts P1, P4, and P5 that make up the second planetary gear mechanism PG2 rotate at the same rotational speed, thereby reducing power transmission loss due to differential rotation between the rotating parts. In this embodiment, the rotating parts P1 and P4 are two specific rotating parts that can be connected and disconnected from each other by the first engaging element CL1. However, the two specific rotating parts that can be connected and disconnected from each other by the first engaging element CL1 may be the rotating parts P1 and P5, or the rotating parts P4 and P5. By connecting any two of the rotating parts P1, P4, and P5 that make up the second planetary gear mechanism PG2 to each other by the first engaging element CL1, the rotating parts P1, P4, and P5 can be rotated at the same rotational speed.

[0063] In this embodiment, the second planetary gear mechanism PG2 realizes two gear stages with one planetary gear mechanism, but by combining it with a first planetary gear mechanism PG1 in which the first sun gear S1 as the first rotating element is connected to the second sun gear S2 as the sixth rotating element and the first ring gear R1 as the third rotating element is fixed, it can be said that this makes it possible to realize the second gear, which is an intermediate gear stage.

[0064] Next, a modified example of the embodiment of the present invention will be described.

[0065] FIG. 4 is a skeleton diagram of a unit 100 according to a modified example.

[0066] The first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are single-pinion planetary gear mechanisms, similar to the unit 100 shown in FIG.

[0067] In the modified example of Figure 4, the first rotating part P1 is formed by combining a first sun gear S1 as the first rotating element and a second sun gear S2 as the sixth rotating element, the second rotating part P2 is formed by a first carrier C1 as the second rotating element, the third rotating part P3 is formed by a first ring gear R1 as the third rotating element, the fourth rotating part P4 is formed by a second ring gear R2 as the fourth rotating element, and the fifth rotating part P5 is formed by a second carrier C2 as the fifth rotating element.

[0068] The first rotating part P1 is connected to the input element IN. The fifth rotating part P5 is connected to the output element OUT. The third rotating part P3 is fixed to the housing 1 as a fixed element.

[0069] One side of the first engaging element CL1 is connected to the second carrier C2 as the fifth rotational region P5, the other side of the first engaging element CL1 is connected to the first sun gear S1 and the second sun gear S2 as the first rotational region P1, one side of the second engaging element CL2 is connected to the first carrier C1 as the second rotational region P2, the other side of the second engaging element CL2 is connected to the second ring gear R2 as the fourth rotational region P4, one side of the third engaging element B1 is connected to the second ring gear R2 as the fourth rotational region P4, and the other side of the third engaging element B1 is fixed to the housing 1.

[0070] In the modified example of FIG. 4, the first planetary gear mechanism PG1 is disposed on one axial side of the second planetary gear mechanism PG2, and the first engagement element CL1 is disposed on the other axial side of the second planetary gear mechanism PG2.

[0071] This allows the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 to be arranged closer to each other than when the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are arranged between them. This increases the degree of freedom in the layout of other elements and also reduces the axial dimension of the unit 100. It also increases the degree of freedom in selecting an actuator to be used for the first engagement element CL1.

[0072] Furthermore, when viewed in the axial direction, the first to third engaging elements CL1, CL2, B1 can be made to overlap with the gear device 2. When these are made to overlap, the radial dimension of the unit 100 can be reduced.

[0073] The engagement table and alignment chart of the modified example of FIG. 4 are the same as those of the skeleton diagram of FIG. 1 shown in FIGS.

[0074] FIG. 5A is a skeleton diagram of a unit 100 according to a modified example.

[0075] 5A, unlike unit 100 shown in FIG. 1, first planetary gear mechanism PG1 and second planetary gear mechanism PG2 are double-pinion planetary gear mechanisms. That is, first carrier C1 has a plurality of inner pinion gears (not shown) that mesh with first sun gear S1 and a plurality of outer pinion gears (not shown) that mesh with first ring gear R1, and the plurality of inner pinion gears mesh with the plurality of outer pinion gears. Also, second carrier C2 has a plurality of inner pinion gears (not shown) that mesh with second sun gear S2 and a plurality of outer pinion gears (not shown) that mesh with second ring gear R2, and the plurality of inner pinion gears mesh with the plurality of outer pinion gears.

[0076] In the modified example of Figure 5A, the first rotating part P1 is formed by combining a first sun gear S1 as the first rotating element and a second sun gear S2 as the sixth rotating element, the second rotating part P2 is formed by a first ring gear R1 as the second rotating element, the third rotating part P3 is formed by a first carrier C1 as the third rotating element, the fourth rotating part P4 is formed by a second carrier C2 as the fourth rotating element, and the fifth rotating part P5 is formed by a second ring gear R2 as the fifth rotating element.

[0077] The first rotating part P1 is connected to the input element IN. The fifth rotating part P5 is connected to the output element OUT. The third rotating part P3 is fixed to the housing 1 as a fixed element.

[0078] One side of the first engaging element CL1 is connected to the second carrier C2 as the fourth rotational portion P4, the other side of the first engaging element CL1 is connected to the first sun gear S1 and the second sun gear S2 as the first rotational portion P1, one side of the second engaging element CL2 is connected to the first ring gear R1 as the second rotational portion P2, the other side of the second engaging element CL2 is connected to the second carrier C2 as the fourth rotational portion P4, one side of the third engaging element B1 is connected to the second carrier C2 as the fourth rotational portion P4, and the other side of the third engaging element B1 is fixed to the housing 1.

[0079] In the modified example of Figure 5A, the first engagement element CL1 is arranged on one axial side of the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2, and the second engagement element CL2 is arranged on the other axial side of the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2.

[0080] This allows the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 to be disposed close to each other, thereby increasing the degree of freedom in the layout of other elements and reducing the axial dimension of the unit 100. Furthermore, it also allows for greater freedom in selecting the actuator used for the first engagement element CL1 and the actuator used for the second engagement element CL2.

[0081] Furthermore, one side of the first engaging element CL1 and one side of the third engaging element B1 can be made into a common component (integrated component), thereby enabling the number of components of the unit 100 to be reduced.

[0082] Furthermore, when viewed in the axial direction, the first to third engaging elements CL1, CL2, B1 can be made to overlap with the gear device 2. When these are made to overlap, the radial dimension of the unit 100 can be reduced.

[0083] The engagement table of the modified example of FIG. 5A is the same as that of the skeleton diagram of FIG. 1 shown in FIG.

[0084] Figure 5B is a collinear diagram of a modified example of Figure 5A. Because the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are double-pinion planetary gear mechanisms, on the collinear diagram, the first ring gear R1 is disposed between the first sun gear S1 and the first carrier C1, and the second ring gear R2 is disposed between the second sun gear S2 and the second carrier C2.

[0085] That is, the three vertical lines 11 to 13 of the first planetary gear mechanism PG1 indicate, from the left, the first sun gear S1 that constitutes the first rotation region P1, the first ring gear R1 that constitutes the second rotation region P2, and the first carrier C1 that constitutes the third rotation region P3. The three vertical lines 14 to 16 of the second planetary gear mechanism PG2 indicate, from the right, the second sun gear S2 that constitutes the first rotation region P1, the second ring gear R2 that constitutes the fifth rotation region P5, and the second carrier C2 that constitutes the fourth rotation region P4.

[0086] In the nomographic diagram of Figure 5B, the rotational elements that make up the first to fifth rotational regions P1 to P5 are different from those shown in Figure 3, but the connection relationship between the first to fifth rotational regions P1 to P5 and the first to third engagement elements CL1, CL2, and B1 is the same as that shown in Figure 3, so the nomographic diagram obtained is essentially the same.

[0087] FIG. 6A is a skeleton diagram of a unit 100 according to a modified example.

[0088] In the modified example of FIG. 6A, the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are single-pinion planetary gear mechanisms, similar to the unit 100 shown in FIG.

[0089] In the modified example of Figure 6A, the first rotating part P1 is formed by combining a first sun gear S1 as the first rotating element and a second ring gear R2 as the sixth rotating element, the second rotating part P2 is formed by a first carrier C1 as the second rotating element, the third rotating part P3 is formed by the first ring gear R1 as the third rotating element, the fourth rotating part P4 is formed by the second sun gear S2 as the fourth rotating element, and the fifth rotating part P5 is formed by the second carrier C2 as the fifth rotating element.

[0090] The first rotating part P1 is connected to the input element IN. The fifth rotating part P5 is connected to the output element OUT. The third rotating part P3 is fixed to the housing 1 as a fixed element.

[0091] One side of the first engaging element CL1 is connected to the second sun gear S2 as the fourth rotational portion P4, the other side of the first engaging element CL1 is connected to the first sun gear S1 and the second ring gear R2 as the first rotational portion P1, one side of the second engaging element CL2 is connected to the first carrier C1 as the second rotational portion P2, the other side of the second engaging element CL2 is connected to the second sun gear S2 as the fourth rotational portion P4, one side of the third engaging element B1 is connected to the second sun gear S2 as the fourth rotational portion P4, and the other side of the third engaging element B1 is fixed to the housing 1.

[0092] 6A, one side of the first engaging element CL1 and the other side of the second engaging element CL2 can be made into a common part (integrated part), thereby reducing the number of parts of the unit 100. In addition to one side of the first engaging element CL1 and the other side of the second engaging element CL2, one side of the third engaging element B1 may also be made into a common part (integrated part).

[0093] Furthermore, when viewed in the axial direction, the first to third engaging elements CL1, CL2, B1 can be made to overlap with the gear device 2. When these are made to overlap, the radial dimension of the unit 100 can be reduced.

[0094] The engagement table of the modified example of FIG. 6A is the same as that of the skeleton diagram of FIG. 1 shown in FIG.

[0095] FIG. 6B is a collinear diagram of a modified example of FIG. 6A.

[0096] The three vertical lines 11 to 13 of the first planetary gear mechanism PG1 indicate, from the left, the first sun gear S1 that constitutes the first rotational region P1, the first carrier C1 that constitutes the second rotational region P2, and the first ring gear R1 that constitutes the third rotational region P3. The three vertical lines 14 to 16 of the second planetary gear mechanism PG2 indicate, from the right, the second ring gear R2 that constitutes the first rotational region P1, the second carrier C2 that constitutes the fifth rotational region P5, and the second sun gear S2 that constitutes the fourth rotational region P4.

[0097] In the nomographic diagram of Figure 6B, the rotational elements that make up the first to fifth rotational regions P1 to P5 are different from those shown in Figure 3, but the connection relationship between the first to fifth rotational regions P1 to P5 and the first to third engagement elements CL1, CL2, and B1 is the same as that shown in Figure 3, so the nomographic diagram obtained is essentially the same.

[0098] FIG. 7A is a skeleton diagram of a unit 100 according to a modified example.

[0099] In the modified example of FIG. 7A, the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 are single-pinion planetary gear mechanisms, similar to the unit 100 shown in FIG.

[0100] In the modified example of Figure 7A, the first rotating part P1 is formed by combining a first ring gear R1 as the first rotating element and a second sun gear S2 as the sixth rotating element, the second rotating part P2 is formed by a first carrier C1 as the second rotating element, the third rotating part P3 is formed by the first sun gear S1 as the third rotating element, the fourth rotating part P4 is formed by the second ring gear R2 as the fourth rotating element, and the fifth rotating part P5 is formed by the second carrier C2 as the fifth rotating element.

[0101] The first rotating part P1 is connected to the input element IN. The fifth rotating part P5 is connected to the output element OUT. The third rotating part P3 is fixed to the housing 1 as a fixed element.

[0102] One side of the first engaging element CL1 is connected to the second ring gear R2 as the fourth rotational portion P4, the other side of the first engaging element CL1 is connected to the first ring gear R1 and the second sun gear S2 as the first rotational portion P1, one side of the second engaging element CL2 is connected to the first carrier C1 as the second rotational portion P2, the other side of the second engaging element CL2 is connected to the second ring gear R2 as the fourth rotational portion P4, one side of the third engaging element B1 is connected to the second ring gear R2 as the fourth rotational portion P4, and the other side of the third engaging element B1 is fixed to the housing 1.

[0103] 7A, one side of the first engaging element CL1 and the other side of the second engaging element CL2 can be made into a common part (integrated part), thereby reducing the number of parts of the unit 100. In addition to one side of the first engaging element CL1 and the other side of the second engaging element CL2, one side of the third engaging element B1 may also be made into a common part (integrated part).

[0104] Furthermore, when viewed in the axial direction, the first to third engaging elements CL1, CL2, B1 can be made to overlap with the gear device 2. When these are made to overlap, the radial dimension of the unit 100 can be reduced.

[0105] The engagement table of the modified example of FIG. 7A is the same as that of the skeleton diagram of FIG. 1 shown in FIG.

[0106] FIG. 7B is a collinear diagram of a modification of FIG. 7A.

[0107] The three vertical lines 11 to 13 of the first planetary gear mechanism PG1 indicate, from the left, the first ring gear R1 that constitutes the first rotation region P1, the first carrier C1 that constitutes the second rotation region P2, and the first sun gear S1 that constitutes the third rotation region P3. The three vertical lines 14 to 16 of the second planetary gear mechanism PG2 indicate, from the right, the second sun gear S2 that constitutes the first rotation region P1, the second carrier C2 that constitutes the fifth rotation region P5, and the second ring gear R2 that constitutes the fourth rotation region P4.

[0108] In the nomographic diagram of Figure 7B, the rotational elements that make up the first to fifth rotational regions P1 to P5 are different from those shown in Figure 3, but the connection relationship between the first to fifth rotational regions P1 to P5 and the first to third engagement elements CL1, CL2, and B1 is the same as that shown in Figure 3, so the nomographic diagram obtained is essentially the same.

[0109] Next, the effects of the embodiment of the present invention will be described. (1) In the embodiment of the present invention, in the examples shown in FIGS. 1, 4, 5A, 6A, and 7A, Unit 100 is An input element IN; an output element OUT; a gear device 2 (FIGS. 3, 5B, 6B, 7B) configured by coupling the rotational elements of a first planetary gear mechanism PG1 and a second planetary gear mechanism PG2 at one location, in which, on a nomographic diagram, the second rotational part P2 is disposed between the first rotational part P1 and the third rotational part P3, which are the coupled rotational elements, and the fifth rotational part P5 is disposed between the first rotational part P1 and the fourth rotational part P4; Equipped with. The input element IN is connected to the first rotation part P1, The output element OUT is connected to the fifth rotational position P5, The third rotational portion P3 is fixed, the fourth rotation portion P4 is selectively connectable to the housing 1 or the second rotation portion P2; Any two of the first rotating portion P1, the fourth rotating portion P4, and the fifth rotating portion P5 can be connected to or disconnected from each other.

[0110] According to this embodiment, two gears can be achieved by switching the connection of the fourth rotating part P4. Furthermore, by connecting any two specific rotational parts P1, P4, and P5, the first rotating part P1, P4, and P5 can be rotated integrally, achieving a gear with a gear ratio of 1. In other words, three gears can be achieved. Because the inter-gear ratio is small, an appropriate gear ratio can be set depending on the speed range. Furthermore, because the gear ratio is 1 in third gear, power transmission loss due to differential rotation between the rotating parts can be reduced.

[0111] (2) The gear device 2 can be configured as shown in Figs. 1 and 4. In the example shown in Figs. 1 and 4, The first planetary gear mechanism PG1 is a single-pinion planetary gear mechanism that includes a first sun gear S1, a first carrier C1, and a first ring gear R1, and is arranged between the first sun gear S1 and the first ring gear R1 on the nomographic diagram (Figure 3). The second planetary gear mechanism PG2 is a single-pinion planetary gear mechanism that includes a second ring gear R2, a second carrier C2, and a second sun gear S2, and is arranged between the second ring gear R2 and the second sun gear S2 on the nomographic diagram (Figure 3). The first rotational part P1 is configured by connecting the first sun gear S1 and the second sun gear S2, The second rotating portion P2 is formed by the first carrier C1, The third rotating portion P3 is formed by the first ring gear R1, The fourth rotating portion P4 is formed by the second ring gear R2, The fifth rotational part P5 is formed by the second carrier C2.

[0112] The gear device 2 can also be configured as shown in Figure 5A. In the example shown in Figure 5A, The first planetary gear mechanism PG1 is a double-pinion planetary gear mechanism that includes a first sun gear S1, a first ring gear R1, and a first carrier C1, and is arranged between the first sun gear S1 and the first carrier C1 on the nomographic diagram (FIG. 5B). The second planetary gear mechanism PG2 is a double-pinion planetary gear mechanism that includes a second carrier C2, a second ring gear R2, and a second sun gear S2, and is arranged between the second carrier C2 and the second sun gear S2 on the nomographic diagram (FIG. 5B). The first rotational part P1 is configured by connecting the first sun gear S1 and the second sun gear S2, The second rotating portion P2 is formed by the first ring gear R1, The third rotating portion P3 is formed by the first carrier C1, The fourth rotating portion P4 is formed by the second carrier C2, The fifth rotating part P5 is formed by the second ring gear R2.

[0113] The gear device 2 can also be configured as shown in Figure 6A. In the example shown in Figure 6A, The first planetary gear mechanism PG1 is a single-pinion planetary gear mechanism that includes a first sun gear S1, a first carrier C1, and a first ring gear R1, and is arranged between the first sun gear S1 and the first ring gear R1 on the nomographic diagram (FIG. 6B). The second planetary gear mechanism PG2 is a single-pinion planetary gear mechanism that includes a second sun gear S2, a second carrier C2, and a second ring gear R2, and is arranged between the second sun gear S2 and the second ring gear R2 on the nomographic diagram (FIG. 6B). The first rotational part P1 is configured by connecting the first sun gear S1 and the second ring gear R2, The second rotating portion P2 is formed by the first carrier C1, The third rotating portion P3 is formed by the first ring gear R1, The fourth rotational portion P4 is formed by the second sun gear S2, The fifth rotational part P5 is formed by the second carrier C2.

[0114] The gear device 2 can also be configured as shown in Figure 7A. In the example shown in Figure 7A, The first planetary gear mechanism PG1 is a single-pinion planetary gear mechanism that includes a first ring gear R1, a first carrier C1, and a first sun gear S1, and is arranged between the first ring gear R1 and the first sun gear S1 on the nomographic diagram (FIG. 7B). The second planetary gear mechanism PG2 is a single-pinion planetary gear mechanism that includes a second ring gear R2, a second carrier C2, and a second sun gear S2, and is arranged between the second ring gear R2 and the second sun gear S2 on the nomographic diagram (FIG. 7B). The first rotational part P1 is configured by combining the first ring gear R1 and the second sun gear S2, The second rotating portion P2 is formed by the first carrier C1, The third rotational part P3 is formed by the first sun gear S1, The fourth rotating portion P4 is formed by the second ring gear R2, The fifth rotational part P5 is formed by the second carrier C2.

[0115] (3) The configuration in which the fourth rotational part P4 can be selectively connected to the housing 1 or the second rotational part P2, and the configuration in which any two of the first rotational part P1, the fourth rotational part P4, and the fifth rotational part P5 can be connected and disconnected from each other can be realized by the first to third engagement elements CL1, CL2, and B1. In the examples shown in FIGS. 1, 5A, 6A, and 7A, Unit 100 is a first engagement element CL1; A second engagement element CL2, A third engagement element B1, Equipped with. One side of the first engagement element CL1 is connected to the fourth rotation region P4, The other side of the first engagement element CL1 is connected to the first rotation part P1, One side of the second engagement element CL2 is connected to the second rotation part P2, The other side of the second engagement element CL2 is connected to the fourth rotation region P4, One side of the third engagement element B1 is connected to the fourth rotation region P4, The other side of the third engaging element B1 is fixed to the housing 1.

[0116] (4) In the example shown in Fig. 5A, the first engaging element CL1 is disposed on one axial side of the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2, and the second engaging element CL2 is disposed on the other axial side of the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. This allows the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 to be disposed close to each other. This increases the degree of freedom in the layout of other elements and also reduces the axial dimension of the unit 100. It also increases the degree of freedom in selecting the actuator used for the first engaging element CL1 and the actuator used for the second engaging element CL2.

[0117] 5A, one side of the first engaging element CL1 and one side of the third engaging element B1 may be formed as an integrated part, thereby reducing the number of parts of the unit 100.

[0118] 1, 6A, and 7A, one side of the first engaging element CL1 and the other side of the second engaging element CL2 may be formed as an integrated part, thereby reducing the number of parts of the unit 100.

[0119] (7) The configuration in which the fourth rotating part P4 can be selectively connected to the housing 1 or the second rotating part P2, and the configuration in which any two of the first rotating part P1, the fourth rotating part P4, and the fifth rotating part P5 can be connected and disconnected from each other, can also be configured as shown in Figure 4. In the example shown in Figure 4, Unit 100 is a first engagement element CL1; A second engagement element CL2, A third engagement element B1, Equipped with. One side of the first engagement element CL1 is connected to the fifth rotation region P5, The other side of the first engagement element CL1 is connected to the first rotation part P1, One side of the second engagement element CL2 is connected to the second rotation part P2, The other side of the second engagement element CL2 is connected to the fourth rotation region P4, One side of the third engagement element B1 is connected to the fourth rotation region P4, The other side of the third engaging element B1 is fixed to the housing 1.

[0120] (8) In the example shown in Fig. 4, the first planetary gear mechanism PG1 is disposed on one axial side of the second planetary gear mechanism PG2, and the first engaging element CL1 is disposed on the other axial side of the second planetary gear mechanism PG2. This allows the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2 to be disposed closer to each other than when the first engaging element CL1 and the second engaging element CL2 are disposed between the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. This increases the degree of freedom in the layout of other elements and also reduces the axial dimension of the unit 100. It also increases the degree of freedom in selecting an actuator to be used for the first engaging element CL1.

[0121] Although the embodiments of the present invention have been described above, the above embodiments are merely application examples of the present invention, and the technical scope of the present invention is not intended to be limited to the specific configurations of the above embodiments.

[0122] The skeleton diagrams shown in FIGS. 1, 4, 5A, 6A, and 7A are only some of the application examples of the present invention, and the skeleton diagrams of units to which the present invention is applied are not limited to these.

[0123] Furthermore, either a single-pinion planetary gear mechanism or a double-pinion planetary gear mechanism may be used as the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. [Explanation of symbols]

[0124] 1: Housing (fixing element) 2: Gearing 100: Unit CL1: First engagement element CL2: Second engagement element B1: Third engagement element S1: First sun gear (first rotating element, third rotating element) C1: First carrier (second rotating element, third rotating element) R1: 1st ring gear (1st rotating element, 2nd rotating element, 3rd rotating element) S2: Second sun gear (fourth rotating element, sixth rotating element) C2: Second carrier (fourth rotating element, fifth rotating element) R2: Second ring gear (fourth, fifth, and sixth rotating elements) P1: First rotation point P2: Second rotation area P3: Third rotation area P4: 4th rotation part P5: 5th rotation area IN : Input element OUT: Output element PG1: First planetary gear mechanism PG2: Second planetary gear mechanism

Claims

1. An input element; An output element; a gear device configured by coupling rotational elements of a first planetary gear mechanism and a second planetary gear mechanism at one location, wherein, on a nomographic diagram, a second rotational portion is disposed between the first rotational portion and the third rotational portion, which are the coupled rotational elements, and a fifth rotational portion is disposed between the first rotational portion and the fourth rotational portion; Equipped with the input element is connected to the first rotation portion; the output element is connected to the fifth rotational portion; the third rotating portion is fixed; the fourth rotating portion is selectively connectable to a fixed element or the second rotating portion; Any two of the first rotation portion, the fourth rotation portion, and the fifth rotation portion can be connected and disconnected to each other. unit.

2. 2. The unit of claim 1, the first planetary gear mechanism includes a first rotation element, a second rotation element, and a third rotation element, and the second rotation element is disposed between the first rotation element and the third rotation element on a collinear diagram; the second planetary gear mechanism includes a fourth rotation element, a fifth rotation element, and a sixth rotation element, and the fifth rotation element is disposed between the fourth rotation element and the sixth rotation element on a collinear diagram, the first rotating portion is configured by combining the first rotating element and the sixth rotating element, the second rotating portion is composed of the second rotating element, the third rotating portion is composed of the third rotating element, the fourth rotating portion is composed of the fourth rotating element, The fifth rotating portion is composed of the fifth rotating element. unit.

3. 3. A unit according to claim 1 or 2, A first engagement element; A second engagement element; A third engagement element; Equipped with One side of the first engagement element is connected to the fourth rotation portion, The other side of the first engagement element is connected to the first rotation portion, One side of the second engagement element is connected to the second rotation portion, the other side of the second engagement element is connected to the fourth rotation portion, one side of the third engagement element is connected to the fourth rotation portion, The other side of the third engagement element is fixed to the fixing element. unit.

4. 4. The unit of claim 3, the first engaging element is disposed on one axial side of the first planetary gear mechanism and the second planetary gear mechanism, the second engaging element is disposed on the other axial side of the first planetary gear mechanism and the second planetary gear mechanism; unit.

5. 4. The unit of claim 3, The one side of the first engaging element and the one side of the third engaging element are configured as an integral part. unit.

6. 4. The unit of claim 3, The one side of the first engaging element and the other side of the second engaging element are configured as an integral part. unit.

7. 3. A unit according to claim 1 or 2, A first engagement element; A second engagement element; A third engagement element; Equipped with One side of the first engagement element is connected to the fifth rotation portion, The other side of the first engagement element is connected to the first rotation portion, One side of the second engagement element is connected to the second rotation portion, the other side of the second engagement element is connected to the fourth rotation portion, one side of the third engagement element is connected to the fourth rotation portion, The other side of the third engagement element is fixed to the fixing element. unit.

8. 8. The unit of claim 7, the first planetary gear mechanism is disposed on one axial side of the second planetary gear mechanism, the first engaging element is disposed on the other axial side of the second planetary gear mechanism; unit.

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