Power take-off transmission for tractor

Abstract

The present invention relates to a power take-off transmission for a tractor. The power take-off transmission for a tractor, according to the present invention, comprises: a rotating body disposed in an internal space of a case and rotating in response to rotation of a driven shaft; and a sensor detecting the rotational speed of the rotating body. According to the present invention, a working machine coupled to the tractor can be appropriately operated, thereby providing effects such as enhanced user convenience, improved work efficiency, and reduced fuel consumption.

Description

Tractor's power take-off transmission

[0001] The present invention relates to a transmission used in the process of extracting rotational power from a tractor to an implement.

[0002] A tractor is a work vehicle used in agricultural work.

[0003] Farming work using a tractor is carried out by implements attached to the tractor.

[0004] Linear or rotational power is required for the working machine to operate.

[0005] Linear power is generated in a hydraulic cylinder operated by the hydraulic pressure of a hydraulic pump linked to an engine or drive motor (hereinafter referred to as the 'power generator').

[0006] Rotational power is generated in the power generator.

[0007] The rotational power generated by the power generator is used for both driving the tractor and operating the implements.

[0008] The tractor is equipped with a power take-off (PTO) system to transmit rotational power generated by a power generator to the implement.

[0009] The rotational power generated by the power generator has a high angular velocity, so it cannot be used directly for the operation of the working machine.

[0010] The high angular velocity of the rotational power of the power generator must be reduced and transmitted to the working machine.

[0011] The power take-off system has a transmission device to reduce the high angular velocity of the rotational power of the power generator.

[0012] The rotational power, reduced through the transmission, is withdrawn via the extraction shaft and transmitted to the working machine.

[0013] Recently, there have been many situations requiring high-efficiency work depending on the work environment.

[0014] For high-efficiency work, it is necessary to control the operating speed of the implement.

[0015] The operating speed of the working machine is directly related to the rotational speed of the extraction axis.

[0016] For high-efficiency operation, it is necessary to properly control the rotational speed of the extraction shaft.

[0017] In conventional tractors, while the number of gears in the transmission could be determined, the rotational speed of the pull-out shaft from which the actual rotational power is extracted could not be determined.

[0018] High-efficiency operation is only possible if the rotational speed of the extraction shaft is known accurately.

[0019] First, a technology to detect the rotational speed of the extraction shaft can be considered.

[0020] However, a significant amount of foreign matter is generated during tractor operations. Sensor errors caused by this foreign matter are anticipated.

[0021] The tractor's target work area is mainly rough farmland. Damage to the sensor due to interference with external objects during operation is also expected.

[0022] [Prior Art Literature]

[0023] [Patent Literature]

[0024] (Patent Document 1) Korean Patent Publication No. 10-2018-0117134

[0025] Detectors need to be placed so as to be independent from foreign substances generated during the operation.

[0026] Sensors need to be placed to prevent interference with external objects during the operation.

[0027] A power take-off transmission for a tractor according to the first embodiment of the present invention comprises: a plurality of drive gears coupled to a drive shaft that rotates with a driving force generated by a power generator and rotates together with the drive shaft; a plurality of driven gears that mesh with each of the plurality of drive gears and can selectively transmit driving force to a driven shaft; a selection element that selectively connects the plurality of driven gears to the driven shaft, thereby enabling the plurality of driven gears to selectively transmit driving force to the driven shaft; a case having an internal space capable of accommodating the plurality of drive gears, the plurality of driven gears, and the selection element; a rotating body disposed on the internal space of the case and rotating in correspondence with the rotation of the driven shaft; and a sensor that detects the rotational speed of the rotating body.

[0028] The above-mentioned rotating body rotates at the same angular velocity as the above-mentioned driven shaft.

[0029] The above-mentioned rotating body is coupled to the above-mentioned driven shaft and rotates together with the above-mentioned driven shaft.

[0030] The above-mentioned rotating body is positioned closer to one side wall of the case than the plurality of driven gears, and the sensor is installed on the one side wall.

[0031] The above-mentioned rotating body is in the shape of a disc, with passage regions for light to pass through arranged along the circumference, and the sensor detects the rotational speed of the rotating body through light emission and reception.

[0032] The above-mentioned rotating body has teeth formed along the circumference, and the passage area is formed between the teeth.

[0033] An installation hole for installing the detector is formed in the above case, and the detector is installed in the case while blocking the installation hole.

[0034] The above sensor is detachably coupled to the above case so that it can be replaced.

[0035] The coupling structure of the sensor and the case is implemented to allow the sensor to be detached from the outside of the case.

[0036] A power take-off transmission device for a tractor according to a second embodiment of the present invention comprises: a plurality of drive gears coupled to a drive shaft that rotates with a driving force generated by a power generator and rotates together with the drive shaft; a plurality of driven gears that mesh with each of the plurality of drive gears and can selectively transmit driving force to a driven shaft; a selection element that selectively connects the plurality of driven gears to the driven shaft, thereby enabling the plurality of driven gears to selectively transmit driving force to the driven shaft; a case having an internal space capable of accommodating the plurality of drive gears, the plurality of driven gears, and the selection element; and a sensor for detecting the rotational speed of the driven shaft; wherein a mounting hole is formed in the case for installing the sensor, and the sensor is installed in the case while blocking the mounting hole to detect the internal state of the case.

[0037] The above sensor is detachably coupled to the above case so that it can be replaced.

[0038] The coupling structure of the sensor and the case is implemented to allow the sensor to be detached from the outside of the case.

[0039] The sensor comprises: a sensing portion for sensing the rotational speed of the driven shaft; and an operating portion that can be operated by a worker using a hand or a tool to install the sensor in the case; wherein the sensor is installed in the case such that the sensing portion faces the inside of the case and the operating portion faces the outside of the case.

[0040] Since detection errors caused by foreign substances are prevented, control of the power generator based on reliable detection values ​​becomes possible.

[0041] The power generator can be controlled according to the working conditions, increasing user convenience and work efficiency.

[0042] Fuel consumption is reduced by using rotational power appropriate for the working situation.

[0043] Since damage to the sensor due to interference with external objects is prevented, the reliability of the tractor is improved.

[0044] The replacement of damaged sensors becomes easier, and the tractor's operating rate improves.

[0045] FIG. 1 is a schematic cross-sectional view of a power take-off transmission for a tractor according to an embodiment of the present invention.

[0046] Figure 2 is an excerpt of the case extracted from the transmission device of Figure 1.

[0047] Figure 3 is an excerpt of the rotating plate from the transmission of Figure 1.

[0048] Figure 4 shows another example of the turntable of Figure 3.

[0049] Figure 5 is an excerpt of the sensor extracted from the transmission device of Figure 1.

[0050] FIG. 6 is a schematic cross-sectional view according to a modified example of the transmission device of FIG. 1.

[0051] Preferred embodiments according to the present invention will be described with reference to the accompanying drawings, provided that for the sake of brevity, descriptions of well-known configurations are omitted or compressed as much as possible.

[0052] FIG. 1 is a schematic cross-sectional view for explaining the main components of a power take-off transmission device (100, hereinafter abbreviated as 'transmission device') of a tractor according to one embodiment of the present invention.

[0053] The transmission device (100) of FIG. 1 includes three driving gears (111, 112, 113), three driven gears (121, 122, 123), a sleeve (130), a case (140), a rotating plate (150), and a sensor (160).

[0054] Three drive gears (111, 112, 113) are coupled to the drive shaft (DS).

[0055] The drive shaft (DS) rotates with driving force generated by a power generator (not shown).

[0056] Driving force is rotational power.

[0057] Three drive gears (111, 112, 113) coupled to the drive shaft (DS) rotate together with the drive shaft (DS).

[0058] The first drive gear (111) has the smallest diameter and is used for the lowest gear shift.

[0059] The third drive gear (113) has the largest diameter and is used for the highest gear shift.

[0060] The second drive gear (112) has a diameter between the diameter of the first drive gear (111) and the diameter of the third drive gear (113).

[0061] The second drive gear (112) is used for shifting gears between the shift gears of the first drive gear (111) and the shift gears of the third drive gear (113).

[0062] Relatively speaking, the first drive gear (111) is used for low speed, the second drive gear (112) for medium speed, and the third drive gear (113) for high speed.

[0063] The drive gears (111, 112, 113) according to the example of FIG. 1 are three, but two or four or more drive gears may be provided.

[0064] The three driven gears (121, 122, 123) are each meshed with the three driving gears (111, 112, 113).

[0065] The first driven gear (121) is meshed with the first driving gear (111).

[0066] The first driven gear (121) has the largest diameter and is used for the lowest gear shift.

[0067] The third driven gear (123) is meshed with the third driving gear (113).

[0068] The third driven gear (123) has the smallest diameter and is used for the highest gear shift.

[0069] The second driven gear (122) is meshed with the second driving gear (112).

[0070] The second driven gear (122) has a diameter between the diameter of the first driven gear (121) and the diameter of the third driven gear (123).

[0071] The second driven gear (122) is used for shifting gears between the shifting gears of the first driven gear (121) and the shifting gears of the third driven gear (123).

[0072] Relatively speaking, the first driven gear (121) is used for low speed, the second driven gear (122) for medium speed, and the third driven gear (123) for high speed.

[0073] The driven gears (121, 122, 123) are paired with the driving gears (111, 112, 113), so they are provided in the same number as the driving gears (111, 112, 113).

[0074] The driven gears (121, 122, 123) can be rotated independently of the driven shaft (PS).

[0075] The driven gears (121, 122, 123) can be optionally connected to the driven shaft (PS).

[0076] The driven shaft (PS) is a shaft from which rotational power is drawn from the transmission device (100).

[0077] The driven gears (121, 122, 123) can optionally transmit driving force to the driven shaft (PS).

[0078] When one of the driven gears (121, 122, 123) is connected to the driven shaft (PS), the shifted driving force is drawn out through the driven shaft (PS).

[0079] The sleeve (130) is an optional element that selectively connects the driven gears (121, 122, 123) to the driven shaft (PS).

[0080] The sleeve (130) can selectively connect the driven gears (121, 122, 123) to the driven shaft (PS) by moving its position.

[0081] The user can move the position of the sleeve (130) by operating a control lever (not shown).

[0082] The sleeve (130) may not connect all of the driven gears (121, 122, 123) to the driven shaft (PS).

[0083] When the sleeve (130) connects the first driven gear (121) to the driven shaft (PS), the driving force shifted to a low speed is drawn out through the driven shaft (PS).

[0084] When the sleeve (130) connects the second driven gear (122) to the driven shaft (PS), the driving force shifted to medium speed is drawn out through the driven shaft (PS).

[0085] When the sleeve (130) connects the third driven gear (123) to the driven shaft (PS), the driving force shifted at high speed is drawn out through the driven shaft (PS).

[0086] If the sleeve (130) does not connect all the driven gears (121, 122, 123) to the driven shaft (PS), the driving force is not drawn through the extraction shaft (PS).

[0087] The case (140) accommodates driving gears (111, 112, 113), driven gears (121, 122, 123) and a sleeve (130).

[0088] The driving gears (111, 112, 113), driven gears (121, 122, 123), and sleeve (130) are placed in the internal space (IS) of the case (140).

[0089] The case (IS) protects the components (drive gear, driven gear, sleeve, rotating plate, etc.) placed in the internal space (IS) from external objects or foreign substances.

[0090] As shown in the excerpt of FIG. 2, a mounting hole (IH) is formed in the case (140).

[0091] The installation hole (IH) is formed in one side wall (141) of the case (140).

[0092] The installation hole (IH) is formed to install the detector (160).

[0093] The rotating plate (150) is placed on the internal space (IS) of the case (140).

[0094] The rotating plate (150) is positioned closer to one side wall (141) than the driven gears (121, 122, 123).

[0095] The rotating plate (150) is a rotating body that rotates in correspondence with the rotation of the driven shaft (PS).

[0096] It may be desirable for the angular velocity of the rotating plate (150) to be the same as the angular velocity of the driven shaft (PS).

[0097] In this embodiment, the rotating plate (150) is coupled to the driven shaft (PS).

[0098] The rotating plate (150) rotates together with the driven shaft (PS).

[0099] The rotating plate (150) and the driven shaft (PS) rotate at the same angular velocity.

[0100] However, the rotating body and the driven shaft (PS) do not necessarily need to be implemented to rotate at the same angular velocity.

[0101] It is sufficient if the rotating body is installed to rotate in conjunction with the driven shaft (PS) so that the rotational speed of the driven shaft (PS) can be determined.

[0102] As shown in the excerpt of FIG. 3, the rotating plate (150) is in the shape of a disc.

[0103] The rotating plate (150) has teeth (151) formed along the circumference.

[0104] The space between the teeth (151) functions as a passage area (TS) through which light can pass.

[0105] The passage area (TS) is formed between the teeth (151).

[0106] Figure 4 shows another example of a rotating plate (150).

[0107] The rotating plate (150) of Fig. 4 has passing regions (TS) arranged along the circumference.

[0108] In the rotating plate (150) of Fig. 4, the passing areas (TS) are formed in the shape of holes.

[0109] It is desirable that the pass-through regions (TS) be formed at equal intervals.

[0110] The detector (160) detects the internal state of the case (140).

[0111] The information obtained by the detector (160) detecting the internal state of the case (140) is information related to the rotational speed of the driven shaft (PS).

[0112] The detector (160) detects the rotational speed of the driven shaft (PS).

[0113] The detector (160) detects the rotational speed of the part located in the internal space (IS) among the parts of the driven shaft (PS).

[0114] The detector (160) detects the rotational speed of the driven shaft (PS) by detecting the rotational speed of the rotating plate (150) in the internal space (IS) of the case (140).

[0115] The detector (160) is placed in the installation hole (IH) and is installed on one side wall (141) of the case (140).

[0116] The rotating plate (150) is positioned closer to the detector (160) than to the driven gears (1221, 122, 123).

[0117] When the sensor (160) is installed in the case (140), the sensor (160) blocks the installation hole (IH).

[0118] The detector (160) is structured to block the installation hole (IH).

[0119] The detector (160) is installed in the case (140) while blocking the installation hole (IH).

[0120] Because the detector (160) blocks the installation hole (IH), foreign matter cannot penetrate into the internal space (IS) of the case (140).

[0121] As shown in the excerpt of FIG. 5, the detector (160) includes a sensing part (161) and an operating part (162).

[0122] The sensing part (161) detects the rotational speed of the driven shaft (PS).

[0123] In this embodiment, the sensing portion (161) is implemented to detect the rotational speed of the driven shaft (PS) by detecting the rotational speed of the rotating plate (150).

[0124] The sensing part (161) detects the rotational speed of the rotating plate (150) through light emission and reception.

[0125] The sensing part (161) has a light-emitting element (161a) and a light-receiving element (161b).

[0126] When light irradiated from the light-emitting element (161a) hits the gear (151) and is reflected, the light-receiving element (161b) receives the reflected light.

[0127] A controller (not shown) in the tractor can calculate the rotational speed of the turntable (150) by analyzing the data detected through the light emission and reception at the sensing part (161).

[0128] When the rotational speed of the rotating plate (150) is calculated, the rotational speed of the driven shaft (PS) can be known, or at least the rotational speed of the driven shaft (PS) can be calculated.

[0129] The operating part (162) is used to install the detector (160) in the case (140).

[0130] The operator can operate the control part (162) using their hand or a tool (such as a screwdriver or wrench).

[0131] By utilizing the control part (162), the detector (160) is detachably coupled to the case (140).

[0132] The operator can replace the detector (160) when the detector (160) is damaged.

[0133] As an example, the detector (160) can be connected to the case (140) by a screw connection.

[0134] The operator can mount the detector (160) to the case (140) or remove it from the case (160) by rotating the operating part (162) using their hand or a tool.

[0135] The sensing portion (161) should be positioned so that the light-emitting element (161a) irradiates light toward the internal space (IS) of the case (140).

[0136] The sensing portion (161) should be positioned so that the light receiving element (161b) receives light coming from the internal space (IS) of the case (140).

[0137] The sensing portion (161) is positioned to face the interior of the case (140).

[0138] Since the installation hole (IS) is blocked by the detector (160), the detection part (161) is protected from external objects or foreign substances by the case (140).

[0139] The operating part (162) is positioned to face the outside of the case (140).

[0140] The operator can operate the operating part (162) from the outside of the case (140).

[0141] It is preferable that the detector (160) be designed with a structure in which the operating part (162) protrudes toward the outside of the case (140).

[0142] The operator can mount the detector (160) to the case (140) or remove it from the case (140) from the outside of the case (140).

[0143] When mounting the detector (160) to the case (140) or removing it from the case (140), disassembly of the case (140) is not required.

[0144] The operation of the transmission device (100) having the above configuration is described.

[0145] When one of the driven gears (121, 122, 123) is connected to the driven shaft (PS) by the operation of the user, the driving force of the driving shaft (DS) is transmitted to the driven shaft (PS) through the corresponding driven gear (121 / 122 / 123).

[0146] When the rotating plate (150) rotates along with the rotation of the driven shaft (PS), the detector (160) detects the rotation speed of the rotating plate (150) through light emission and reception.

[0147] The controller determines the rotational speed of the driven shaft (PS) through the rotational speed detected by the detector (160) and displays the determined rotational speed of the driven shaft (PS) through a displayer (not shown).

[0148] The user adjusts the RPM of the power generator (not shown) while checking the rotational speed of the driven shaft (PS) displayed on the display.

[0149] Meanwhile, the detector (160) may malfunction due to prolonged use.

[0150] The user removes the existing sensor (160) from the case (140) by operating the control part (162) using their hand or a tool.

[0151] When the existing detector (160) is removed from the mounting hole (IH) by removal, the user mounts a new detector (160) in the case (140).

[0152] <Variation Example>

[0153] Figure 6 shows a rotating body composed of a rotating gear (153) and a rotating shaft (154).

[0154] The rotating gear (153) is meshed with the driven shaft (PS).

[0155] When the driven shaft (PS) rotates, the rotating gear (153) rotates and the rotating shaft (154) also rotates.

[0156] The detector (160) can detect the rotational speed of the rotation axis (154) by detecting the rotation of the rotation axis (154).

[0157] The controller calculates the rotational speed of the driven shaft (PS) based on the rotational speed of the detected rotational shaft (154).

[0158] The embodiments described above are merely preferred examples, and the present invention may have various other applications or variations. Therefore, the present invention should not be understood as being limited to the above embodiments. Instead, the scope of the present invention should be understood as the separately described claims and their equivalents.

Claims

1. A plurality of drive gears (111, 112, 113) coupled to a drive shaft (DS) that rotates by the driving force generated from a power generator and rotate together with the drive shaft (DS); A plurality of driven gears (121, 122, 123) that are each meshed with the plurality of driving gears (111, 112, 113) and can optionally transmit driving force to a driven shaft (PS); A selection element that enables the plurality of driven gears (121, 122, 123) to selectively transmit driving force to the driven shaft (PS) by selectively connecting the plurality of driven gears (121, 122, 123) to the driven shaft (PS); A case (140) having an internal space (IS) capable of accommodating the plurality of driving gears (111, 112, 113), the plurality of driven gears (121, 122, 123), and a selection element; A rotating body disposed on the internal space (IS) of the above case (140) and rotating in correspondence with the rotation of the driven shaft (PS); and A detector (150) for detecting the rotational speed of the above-mentioned rotating body; comprising Power take-off transmission (100) of a tractor.

2. In Paragraph 1, The above-mentioned rotating body rotates at the same angular velocity as the driven shaft (PS). Power take-off transmission (100) of a tractor.

3. In Paragraph 2, The above-mentioned rotating body is coupled to the driven shaft (PS) and rotates together with the driven shaft (PS). Power take-off transmission (100) of a tractor.

4. In Paragraph 1, The rotating body is positioned closer to one side wall (141) of the case (140) than to the plurality of driven gears (121, 122, 123), and The above detector (160) is installed on the one side wall (141). Power take-off transmission (100) of a tractor.

5. In Paragraph 1, The above-mentioned rotating body is in the shape of a disc, and passing regions (TS) through which light passes are arranged along the circumference, and The above detector (160) detects the rotational speed of the rotating body through light emission and reception. Power take-off transmission (100) of a tractor.

6. In Paragraph 5, The above-mentioned rotating body has teeth (151) formed along the circumference, The passing area (TS) is formed between the above teeth (151). Power take-off transmission (100) of a tractor.

7. In Paragraph 1, The above case (140) has an installation hole (IH) formed therein for installing the detector (160), and The sensor (160) is installed in the case (140) while blocking the installation hole (IH). Power take-off transmission (100) of a tractor.

8. In Paragraph 7, The sensor (160) is detachably coupled to the case (140) so that it can be replaced. Power take-off transmission (100) of a tractor.

9. In Paragraph 8, The coupling structure of the sensor (160) and the case (140) is implemented to allow the sensor (160) to be detached from the outside of the case (140). Power take-off transmission (100) of a tractor.

10. A plurality of drive gears (111, 112, 113) coupled to a drive shaft (DS) that rotates by the driving force generated from a power generator and rotate together with the drive shaft (DS); A plurality of driven gears (121, 122, 123) that are each meshed with the plurality of driving gears (111, 112, 113) and can optionally transmit driving force to a driven shaft (PS); A selection element that enables the plurality of driven gears (121, 122, 123) to selectively transmit driving force to the driven shaft (PS) by selectively connecting the plurality of driven gears (121, 122, 123) to the driven shaft (PS); A case (140) having an internal space (IS) capable of accommodating the plurality of driving gears (111, 112, 113), the plurality of driven gears (121, 122, 123), and a selection element; and A detector (160) for detecting the rotational speed of the above-mentioned driven shaft (PS); comprising, The above case (140) has an installation hole (IH) formed therein for installing the detector (160), and The sensor (160) is installed in the case (140) while blocking the installation hole (IH) to detect the internal state of the case (140). Power take-off transmission (100) of a tractor.

11. In Paragraph 10, The sensor (160) is detachably coupled to the case (140) so that it can be replaced. Power take-off transmission (100) of a tractor.

12. In Paragraph 11, The coupling structure of the sensor (160) and the case (140) is implemented to allow the sensor (160) to be detached from the outside of the case (140). Power take-off transmission (100) of a tractor.

13. In Paragraph 12, The above detector (160) A sensing part (161) for detecting the rotational speed of the above-mentioned driven shaft (PS); and It includes an operating part (162) that can be operated by a worker using their hand or a tool to install the sensor (160) on the case (140); The sensor (160) is installed in the case (140) such that the sensing portion (161) faces the inside of the case (140) and the operating portion (162) faces the outside of the case (140). Power take-off transmission (100) of a tractor.

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