JP6868212B2 - Power transmission device - Google Patents

Description

The present invention relates to a power transmission device.

A power transmission device has been proposed in which power transmitted by a transmission is fixed to an output shaft of the transmission and transmitted to an in-vehicle fixture via a gear that rotates integrally with the output shaft (for example, Patent Document 1). , 2). Further, a power transmission device in which a speedometer gear is splined to an output shaft is known (see, for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 2012-233544 Jikkai Sho 58-124330 Japanese Unexamined Patent Publication No. 6-207654

By the way, since the output shaft (power output shaft) of the transmission is provided with a plurality of transmission gears, sleeves, etc. in a very narrow range, as described in Patent Documents 1 to 3, in order to extract power from the power output shaft. It is difficult to secure a space for the gear and speed meter gear on the power output shaft.

On the other hand, when the male spline of the power output shaft is machined by a gear cutting machine such as a hob cutter, a surplus portion is generated in the axial direction of the power output shaft by the amount of the hob cutter diameter raised, and that portion is generated. It may become a dead space.

Therefore, an object of the present invention is to provide a power transmission device capable of effectively utilizing the limited space of the power output shaft.

In order to solve the above problems, the present disclosure can transmit power between a power output shaft of a transmission that shifts and outputs rotational power generated by a drive source and a rotation shaft on the side of the fixture. It is a power transmission device, and includes a drive gear, an external rotating shaft, an external gear, a gear on the fixture side, and a rotating speed detecting means. The drive gear is spline-coupled to a male spline formed on the outer circumference of the power output shaft. The external rotating shaft is arranged radially outside the power output shaft. The external gear is fixed to the external rotating shaft. The erection side gear is fixed to the erection side rotation shaft and meshes directly with the external gear or indirectly via the idle gear. The rotation speed detecting means is arranged in the vicinity of the teeth of any of the external gear, the fixture side gear, and the idle gear, and outputs a pulse signal corresponding to the rotation speed of the gear. The power output shaft is inserted into a power transmission cylinder having a female spline formed on the inner circumference. The male spline of the power output shaft has a coupling portion for spline coupling to the female spline of the power transmission cylinder and a surplus portion excluding the coupling portion. The drive gear is spline-coupled to the surplus portion of the male spline. The teeth of the external gear are in a state of meshing with the teeth of the drive gear.

In the above configuration, the teeth of the drive gear spline-coupled to the male spline formed on the outer circumference of the power output shaft and the teeth of the external gear are meshed with each other, and the power output shaft of the transmission and the mounting side of the mounting component are engaged. It is configured so that power can be transmitted to and from the rotating shaft. For this reason, a drive gear is provided in the surplus portion of the male spline generated when the male spline is processed on the power output shaft, and the drive gear and the external gear can be meshed with each other, and the dead space around the spline can be effectively utilized. Therefore, the limited space of the power output shaft can be effectively utilized. The power transmission between the power output shaft of the transmission and the rotating shaft on the mounting side of the frame may be transmitted from the power output shaft to the rotating shaft on the mounting side, or on the mounting side. It may be transmitted from the rotating shaft to the power output shaft.

Further, a rotation speed detecting means for detecting the rotation speed of the gear by outputting a pulse signal corresponding to the rotation speed of any of the external gear, the driven gear, and the idle gear is provided. Therefore, for example, when the power transmission device is applied to a vehicle, the traveling speed of the vehicle can be obtained based on the rotational speed of the gear detected by the rotational speed detecting means, so that the traveling speed can be displayed on the speedometer. It is not necessary to provide the speedometer gear of the above on the power output shaft. Therefore, the limited space of the power output shaft can be utilized more effectively.

In addition , a drive gear is provided in the surplus part of the male spline of the power output shaft, and the drive gear and the external gear are meshed with each other, so that the dead space around the spline can be used effectively and the limited space of the power output shaft is effective. Can be used for.

Further, the tooth width of the take-out gear disclosed above may be narrower than the axial width of the surplus portion.

Further, the male spline of the power output shaft of the above disclosure may be formed at the output end of the power output shaft, and the power transmission cylinder may be a shaft joint connected to the input end of the propeller shaft. The female spline may be formed at the input end portion of the shaft joint, or a surplus portion may be formed at the male spline in a state where the power output shaft and the shaft joint are spline-coupled.

Further, the pitch circle diameter of the take-out gear disclosed above may be smaller than the pitch circle diameter of the male spline.

According to the present invention, the limited space of the power output shaft can be effectively utilized.

It is a perspective view of the power transmission device which concerns on 1st Embodiment of this invention. It is sectional drawing in the axial direction of the power transmission device of FIG. It is a schematic diagram which shows the state in which the spline, the take-out gear, and the driven gear of FIG. It is sectional drawing in the axial direction of the power transmission device which concerns on 2nd Embodiment of this invention.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In each figure, x indicates the axial direction of the output shaft, and y indicates the radial direction of the output shaft, which is a direction orthogonal to the axial direction. Further, in FIGS. 1 and 3, in order to explain the internal structure of the power transmission device 10, each of the gear case 11 and the transmission case 23 of the transmission 20 is shown by a two-dot chain line, and in FIGS. 2 and 4, the gear case is shown. Only 11 is indicated by a chain double-dashed line.

As shown in FIGS. 1 and 2, the power transmission device 10 of the first embodiment takes out a part of the rotational power from the output shaft (power output shaft) 21 of the transmission (transmission) 20 of the vehicle and is not shown. It is a PTO (power take-off) device that transmits to the drive shaft (rotary shaft on the side of the frame) 30 of the vehicle-mounted device (frame). The output shaft 21 transmits the rotational power generated by the engine (not shown) as a drive source to the propeller shaft (not shown). The propeller shaft transmits the rotational power from the output shaft 21 to the drive wheels (not shown). The drive shaft 30 is a shaft that drives an in-vehicle fixture by the transmitted rotational power.

Examples of the in-vehicle fixture include a device that can be driven by a part of the rotational power generated by the engine, an oil pump that circulates lubricating oil, and a small generator.

The transmission 20 has a plurality of transmission gears (not shown), an output shaft 21, and a transmission case 23, and shifts the rotational power transmitted from the engine to output from the output shaft 21 to the propeller shaft.

The output shaft 21 is connected to the propeller shaft via a shaft joint 40. A male spline 22 is formed at the output end portion (end portion on the propeller shaft side) of the output shaft 21. The male spline 22 is an involute spline, and for example, a gear cutting machine such as a hob cutter provides a plurality of grooves in which the output end of the output shaft 21 is recessed from the outside to the inside in the radial direction y in the circumferential direction of the output end. It is formed by cutting at equal intervals.

The transmission case 23 rotatably supports the output shaft 21 and the shaft joint 40 via the bearing 24 and the oil seal 25, and covers the surplus portion 22b of the male spline 22, which will be described later.

The shaft joint 40 is a flange type shaft joint (conventional type), and has a cylinder portion (power transmission cylinder) 41 of an input end portion (end portion on the output shaft 21 side) and an output end portion (end portion on the propeller shaft side). ) With a flange 42. The flange 42 of the shaft joint 40 is fastened to the flange on the propeller shaft side (not shown) by bolts 46. The flange 42 of the shaft joint 40 and the flange on the propeller shaft side are fastened and fixed, so that the shaft joint 40 connects the output shaft 21 and the propeller shaft.

A female spline 43 is formed on the inner circumference of the tubular portion 41. The female spline 43 is spline-coupled to the male spline 22 by large-diameter matching. For example, by broaching or electric discharge machining, a plurality of grooves recessed from the inside to the outside in the radial direction y are equally spaced in the circumferential direction. It is formed by cutting into.

The output shaft 21 and the shaft joint 40 are fitted by spline coupling after the male spline 22 of the output shaft 21 is inserted into the female spline 43 of the shaft joint 40. Further, the output end face of the output shaft 21 is fastened to the radial center portion of the flange 42 by bolts 44.

The shaft joint 40 and the propeller shaft are fastened to the flange fixed to the propeller shaft side by bolts 46 inserted into the fastening holes 45 that penetrate the flange 42 of the shaft joint 40 at intervals in the circumferential direction.

The male spline 22 is composed of a connecting portion 22a and a surplus portion 22b adjacent to each other in the axial direction x. As described above, the coupling portion 22a is a portion that is inserted into the tubular portion 41 of the shaft joint 40 and spline-joins with the female spline 43 formed on the inner circumference of the tubular portion 41. The surplus portion 22b is a portion excluding the connecting portion 22a, is a portion that is not inserted into the tubular portion 41, and is a portion that is not spline-coupled. The surplus portion 22b is generated by a machining relief, and when it is machined by a gear cutting machine such as a hob cutter, it extends in the axial direction x by the amount of the hob cutter diameter raised.

The power transmission device 10 includes a gear case 11, a rotary shaft (external rotary shaft) 12, a take-out gear (external gear) 13, a driven gear (a gear on the fixture side) 14, and a rotation detector (rotation speed detection means) 18. Be prepared.

The gear case 11 is fixed to the mission case 23 in a state of protruding toward the outside of the mission case 23. The gear case 11 rotatably supports the rotary shaft 12 and the drive shaft 30, and covers the take-out gear 13 and the driven gear 14. One end of the drive shaft 30 projects outward from the gear case 11 and is connected to an in-vehicle fixture.

The rotating shaft 12 is arranged inside the gear case 11 and radially outside the output shaft 21 so that its axial direction is parallel to the axial direction of the output shaft 21, and is supported by the gear case 11.

The take-out gear 13 is fixed to a rotating shaft 12 and is composed of a spur gear having an involute tooth pattern. The teeth 15 arranged on the outer circumference of the take-out gear 13 mesh with the surplus portion 22b of the male spline 22 of the output shaft 21. The tooth width B3 of the take-out gear 13 is narrower than the width B2 of the surplus portion 22b in the axial direction x.

The driven gear 14 is fixed to a drive shaft 30 and is composed of a spur gear having an involute tooth pattern. The drive shaft 30 is arranged outside the rotation shaft 12 in the radial direction of the output shaft 21. The teeth 19 arranged on the outer periphery of the driven gear 14 mesh with the teeth 15 of the take-out gear 13 at a position opposite to the position where the male spline 22 of the output shaft 21 meshes with the teeth 15 of the take-out gear 13. The tooth width B4 of the driven gear 14 is narrower than the width B2 of the surplus portion 22b in the axial direction x like the tooth width B3 of the take-out gear 13.

The rotation detector 18 is a sensor that outputs a pulse signal corresponding to (proportional to) the rotation speed of the take-out gear 13 to a controller (not shown), and is a gear case arranged in the vicinity of the teeth 15 of the take-out gear 13. It is fixed at 11. The rotation detector 18 generates an electromagnetic induction near the teeth 15 of the take-out gear 13 to generate a pulse signal. The controller calculates the rotation speed of the output shaft 21 based on the pulse signal detected by the rotation detector 18, and the traveling speed of the vehicle based on the rotation speed of the output shaft 21, the final reduction ratio, the outer diameter of the tire, and the like. Is calculated. That is, the controller functions as a traveling speed calculating means for calculating the traveling speed of the vehicle based on the pulse signal detected by the rotation detector 18. The controller causes a speedometer (display unit) in front of the driver's seat (not shown) to display the traveling speed of the vehicle calculated by the controller. That is, the rotation detector 18 is a sensor that outputs a pulse signal corresponding to the rotation speed of the take-out gear 13 in order to calculate the traveling speed of the vehicle displayed on the speedometer. In the present embodiment, the rotation detector 18 is provided in which electromagnetic induction is generated in the vicinity of the teeth 15 of the extraction gear 13 to generate and output a pulse signal, but the present invention is not limited to this, and for example, A rotation detector 18 may be provided that irradiates the teeth 15 of the extraction gear 13 with light to detect the reflected light, and generates and outputs a pulse signal corresponding to the detected reflected light.

As shown in FIG. 3, the take-out gear 13 is set as follows so that its teeth 15 mesh with the male spline 22 of the output shaft 21.

The tooth tip circle diameter dk3 of the take-out gear 13 is smaller than the tooth tip circle diameter dk2 of the male spline 22. The tooth bottom circle diameter df3 of the take-out gear 13 is smaller than the tooth bottom circle diameter df2 of the male spline 22. The pitch circle diameter (reference circle diameter) d3 of the take-out gear 13 is smaller than the pitch circle diameter d2 of the male spline 22. The number of teeth Z3 of the take-out gear 13 is smaller than the number of teeth Z2 of the male spline 22. The module (diameter pitch) m3 (pitch circle diameter d3 / number of teeth Z3) of the take-out gear 13 is equal to the module m2 (pitch circle diameter d2 / number of teeth Z2) of the male spline 22. That is, the normal pitch tm3 of the take-out gear 13 is equal to the normal pitch tm2 of the male spline 22. By making the module m3 of the take-out gear 13 equal to the module m2 of the male spline 22 in this way, the teeth 15 of the take-out gear 13 can be meshed with the male spline 22.

Next, the operation of the power transmission device 10 will be described. When the rotational power is transmitted from the engine to the transmission 20, the rotational power is changed by the transmission 20, and the changed rotational power is transmitted to the output shaft 21 and transmitted to the propeller shaft via the shaft joint 40. .. At this time, a part of the rotational power transmitted to the propeller shaft is transmitted to the take-out gear 13 that meshes with the male spline 22 formed at the output end of the output shaft 21. The rotational power transmitted to the take-out gear 13 is transmitted to the drive shaft 30 via the driven gear 14, and the vehicle-mounted fixture is driven by the rotational power transmitted to the drive shaft 30.

In the power transmission device 10 configured as described above, the teeth 15 of the take-out gear 13 for extracting a part of the rotational power of the output shaft 21 are the male splines 22 generated when the male splines 22 are machined on the output shafts 21. It meshes with the surplus portion 22b of. Therefore, the dead space around the spline can be effectively utilized, and the limited space of the output shaft 21 can be effectively utilized.

Further, the tooth width B3 of the take-out gear 13 is narrower than the width B2 of the surplus portion 22b in the axial direction x, and the pitch circle diameter d3 of the take-out gear 13 is smaller than the pitch circle diameter d2 of the male spline 22. By making the take-out gear 13 lighter, thinner, shorter and smaller in this way, the dead space around the spline can be effectively utilized.

Further, the rotation detector 18 is arranged near the teeth 15 of the take-out gear 13 and outputs a pulse signal corresponding to the rotation speed of the take-out gear 13. Therefore, since the controller can calculate the traveling speed of the vehicle based on the pulse signal detected by the rotation detector 18, a speedometer gear for displaying the traveling speed on the speedometer is provided on the output shaft 21. It does not have to be. Therefore, the limited space of the output shaft 21 can be utilized more effectively.

Further, since the surplus portion 22b of the male spline 22 of the output shaft 21 is utilized, a part of the rotational power can be taken out from the output shaft 21 without extending the length x in the axial direction of the output shaft 21, and the transmission. It is possible to avoid the heavy lengthening of 20.

Further, since it is possible to avoid the heavy and long length of the take-out gear 13 of the power transmission device 10 and the transmission 20, it is possible to reduce the weight of the vehicle and improve the fuel efficiency.

In-vehicle fixtures such as an oil pump that circulates lubricating oil and a small generator can be driven by a part of the rotational power output from the engine. Therefore, by making the take-out gear 13 lighter, thinner, shorter, and smaller, the rotational power transmitted from the drive shaft 30 can be optimized so as not to be over-engineered with respect to the in-vehicle fixture.

In the present embodiment, the rotation detector 18 is arranged in the vicinity of the teeth 15 of the take-out gear 13, but the present invention is not limited to this, and the rotation detector 18 is placed in the vicinity of the teeth 19 of the driven gear 14 (FIG. 2). And the position shown by the alternate long and short dash line 50 in FIG. 3). In this case, the rotation detector 18 may output a pulse signal according to the rotation speed of the driven gear 14.

Further, in the present embodiment, the take-out gear 13 and the driven gear 14 are directly meshed with each other, but the present invention is not limited to this, and at least one intermediate gear (at least one intermediate gear) is used between the take-out gear 13 and the driven gear 14. Idle gear) may be interposed. In this case, the rotation detector 18 may be arranged near the teeth of the intermediate gear, and the rotation detector 18 may output a pulse signal according to the rotation speed of the intermediate gear.

Further, the shape and structure of the shaft joint 40 are not limited to the above, and have a female spline 43 that is spline-coupled to the male spline 22 of the output shaft 21 and connects the output shaft 21 and the propeller shaft. All you need is.

Next, a second embodiment of the present invention will be described with reference to the drawings. The power transmission device 60 according to the present embodiment is different from the first embodiment in that the take-out gear 13 meshes with the drive gear 61 and has an intermediate gear 16. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, a drive gear 61 is provided in the surplus portion 22b of the male spline 22 of the output shaft 21. A female spline (not shown) is formed on the inner circumference of the drive gear 61. The female spline of the drive gear 61 is formed by, for example, broaching or electric discharge machining to cut a plurality of grooves recessed from the inside to the outside in the radial direction at equal intervals in the circumferential direction, and is formed with the male spline 22. Splined. The teeth 62 arranged on the outer circumference of the drive gear 61 mesh with the teeth 15 of the take-out gear 13.

The power transmission device 60 includes an intermediate gear (idle gear) 16 between the take-out gear 13 and the driven gear 14. The intermediate gear 16 is a spur gear similar to the take-out gear 13 and the driven gear 14. The rotary shaft 17 of the intermediate gear 16 is arranged outside the rotary shaft 12 of the take-out gear 13 in the radial direction of the output shaft 21, and is arranged inside the drive shaft 30 in the radial direction of the output shaft 21. The rotating shaft 17 of the intermediate gear 16 is rotatably supported by the gear case 11. The teeth 63 arranged on the outer periphery of the intermediate gear 16 mesh with the teeth 15 of the take-out gear 13 at a position opposite to the position where the teeth 62 of the drive gear 61 mesh with the teeth 15 of the take-out gear 13. The teeth 19 of the driven gear 14 mesh with the teeth 63 of the intermediate gear 16 at a position opposite to the position where the teeth 15 of the extraction gear 13 mesh with the teeth 63 of the intermediate gear 16. That is, the driven gear 14 indirectly meshes with the take-out gear 13 via the intermediate gear 16.

The rotation detector 18 is a sensor that outputs a pulse signal corresponding to (proportional to) the rotation speed of the intermediate gear 16 to a controller (not shown), and is a gear case arranged in the vicinity of the teeth 63 of the intermediate gear 16. It is fixed at 11. The controller calculates the rotation speed of the output shaft 21 based on the pulse signal detected by the rotation detector 18, and the traveling speed of the vehicle based on the rotation speed of the output shaft 21, the final reduction ratio, the outer diameter of the tire, and the like. Is calculated.

In the power transmission device 60 configured as described above, the teeth 15 of the take-out gear 13 for taking out a part of the rotational power of the output shaft 21 are the male splines 22 generated when the male splines 22 are machined on the output shafts 21. It meshes with the drive gear 61 provided in the surplus portion 22b of the above. Therefore, the dead space around the spline can be effectively utilized, and the limited space of the output shaft 21 can be effectively utilized.

Further, the rotation detector 18 is arranged in the vicinity of the teeth 63 of the intermediate gear 16 and outputs a pulse signal corresponding to the rotation speed of the intermediate gear 16. Therefore, since the controller can calculate the traveling speed of the vehicle based on the pulse signal detected by the rotation detector 18, a speedometer gear for displaying the traveling speed on the speedometer is provided on the output shaft 21. It does not have to be. Therefore, the limited space of the output shaft 21 can be utilized more effectively.

Further, by interposing the intermediate gear 16 between the take-out gear 13 and the driven gear 14, the driven gear 14 can be separated from the output shaft 21 and the shaft joint 40. Therefore, by adjusting the number of intermediate gears 16 interposed between the take-out gear 13 and the driven gear 14, the degree of freedom in layout is increased.

In the present embodiment, the rotation detector 18 is arranged in the vicinity of the teeth 63 of the intermediate gear 16, but the present invention is not limited to this, and the rotation detector 18 is arranged in the vicinity of the teeth 15 of the take-out gear 13 (FIG. 4). (Position shown by the alternate long and short dash line 51) or near the teeth 19 of the driven gear 14 (position indicated by the alternate long and short dash line 52 in FIG. 4). In this case, the rotation detector 18 may output a pulse signal according to the rotation speed of the extraction gear 13 or the driven gear 14.

Further, in the present embodiment, one intermediate gear 16 is provided between the take-out gear 13 and the driven gear 14, but the present invention is not limited to this, and a plurality of intermediate gears 16 are provided between the take-out gear 13 and the driven gear 14. An intermediate gear (idle gear) 16 may be provided. Alternatively, the take-out gear 13 and the driven gear 14 may be directly meshed without providing the intermediate gear 16.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the contents of the above-described embodiment, and can be appropriately modified without departing from the present invention. That is, it goes without saying that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are included in the category of the present invention.

For example, in the first embodiment and the second embodiment, the power transmission devices 10 and 60 are applied to a vehicle whose drive source is an engine, but the present invention is not limited to this, and a motor generator is used as a drive source. It may be applied to a vehicle or a hybrid vehicle whose drive source is both an engine and a motor generator.

Further, in the first embodiment and the second embodiment, the power transmission devices 10 and 60 are applied to the vehicle, but the present invention is not limited to this, and the power transmission devices 10 and 60 may be applied to a ship or the like.

Further, in the first embodiment and the second embodiment, the surplus portion 22b of the male spline 22 formed at the output end portion (end portion on the propeller shaft side) of the output shaft 21 is utilized, but the present invention is limited to this. Instead, the surplus portion 22b of the male spline 22 formed at another position of the output shaft 21 may be utilized.

Further, a pipe may be connected to the gear case 11 of the first embodiment and the second embodiment to supply lubricating oil to the inside of the gear case 11.

Further, in the first embodiment and the second embodiment, the power transmission devices 10 and 60 take out a part of the rotational power from the output shaft 21 and transmit it to the drive shaft 30 of the vehicle-mounted fixture. It has been applied to, but is not limited to, take-off) devices. For example, in order to assist the rotational power of a drive source such as an engine, the power transmission device is the power output of the transmission from the rotating shaft on the mounting side of the device (building) that recovers exhaust heat and converts it into power. It may be applied to a PTI (power take-in) device that transmits power to a shaft.

10, 60: Power transmission device 12: Rotating shaft (external rotating shaft)
13: Extraction gear (external gear)
14: Driven gear (gear on the side of the fixture)
15: Extraction gear teeth (external gear teeth)
16: Intermediate gear (idle gear)
18: Rotation detector (rotation speed detection means)
20: Transmission (transmission)
21: Output shaft (power output shaft)
22: Male spline 22a: Coupling part 22b: Surplus part 30: Drive shaft (rotating shaft on the frame side)
40: Shaft joint 41: Cylindrical portion of shaft joint (power transmission cylinder)
43: Female spline 61: Drive gear 62: Drive gear teeth 63: Intermediate gear teeth

Claims (1)

A power transmission device capable of transmitting power between a power output shaft of a transmission that shifts and outputs rotational power generated by a drive source and a rotation shaft on the side of the frame of the frame.
A drive gear spline-coupled to a male spline formed on the outer circumference of the power output shaft,
An external rotating shaft arranged radially outside the power output shaft,
With the external gear fixed to the external rotating shaft,
A gear on the side of the frame that is fixed to the rotating shaft on the side of the frame and meshes directly with the external gear or indirectly via an idle gear.
A rotation speed detecting means that is arranged in the vicinity of the teeth of the external gear, the fixture side gear, or any of the idle gears and outputs a pulse signal corresponding to the rotation speed of the gears is provided.
The power output shaft is inserted into a power transmission cylinder having a female spline formed on the inner circumference.
The male spline of the power output shaft has a coupling portion for spline coupling to the female spline of the power transmission cylinder and a surplus portion excluding the coupling portion.
The drive gear is spline-coupled to the surplus portion of the male spline.
A power transmission device characterized in that the teeth of the external gear are in a state of meshing with the teeth of the drive gear.

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