US-12617274-B2 - Work vehicle

Abstract

A work vehicle includes an output pedal that controls the output of a motive section, a biasing member that biases the output pedal to return, and a brake pedal that operates a travel brake to a braking state. Also included are a holding section operable to a holding state of holding the output pedal at any depressed position and to a release state of releasing the holding of the output pedal, and a manual operating tool for manually operating the holding section to the holding state. Further included are a brake linkage section that operates the holding section to the release state when the brake pedal is depressed in the holding state, and an output linkage section that operates the holding section to the release state when the output pedal is depressed in the holding state.

Inventors

• Tomoyuki Ukai

Assignees

• KUBOTA CORPORATION

Dates

Publication Date

20260505

Application Date

20230405

Priority Date

20220408

Claims (8)

1. 1 . A work vehicle comprising: an output pedal configured to control an output of a motive section; a biasing member configured to bias the output pedal to return; a brake pedal configured to operate a travel brake to a braking state; a holding section operable to a holding state of holding the output pedal at any depressed position and to a release state of releasing the holding of the output pedal and being maintained in the release state when depressed operation of the output pedal is stopped; a manual operating tool for manually operating the holding section to the holding state; a brake linkage section configured to operate the holding section to the release state in response to the brake pedal being depressed in the holding state; an output linkage section configured to operate the holding section to the release state in response to the output pedal being depressed in the holding state; a support member configured to support the output pedal in such a manner that the output pedal is depressable and returnable, an upper link supported by the support member in such a manner as to be swingable up and down and extending rearward from the support member; and a lower link supported by the support member in such a manner as to be swingable up and down and extending rearward from the support member.
2. 2 . The work vehicle according to claim 1 , wherein the manual operating tool is located higher than the output pedal, the output linkage section comprises an operating member disposed above the output pedal at a height between the manual operating tool and the output pedal, and linked to the output pedal so as to operate in conjunction with the output pedal being depressed and then being returned, and wherein the holding section enters the holding state due to being engaged with the operating member and holding the operating member, and enters the release state due to being separated from the operating member.
3. 3 . The work vehicle according to claim 2 , wherein the manual operating tool is spaced away from the output pedal in a left-right direction, and wherein the work vehicle further comprises a linkage member connected to the manual operating tool and the holding section and configured to transmit operation of the manual operating tool to the holding section such that the holding section is operated to the holding state.
4. 4 . The work vehicle according to claim 3 , wherein the brake linkage section is configured such that the holding section is separated from the operating member by the brake pedal in response to the brake pedal being depressed in the holding state.
5. 5 . The work vehicle according to claim 4 , further comprising: wherein the biasing member is connected to the output pedal and the support member.
6. 6 . The work vehicle according to claim 5 , further comprising: wherein the output pedal is connected to a rear section of the upper link and a rear section of the lower link.
7. 7 . A work vehicle comprising: an output pedal configured to control an output of a motive section; a biasing member configured to bias the output pedal to return; a brake pedal configured to operate a travel brake to a braking state; a holding section operable to a holding state of holding the output pedal at any depressed position and to a release state of releasing the holding of the output pedal and being maintained in the release state when depressed operation of the output pedal is stopped; a manual operating tool for manually operating the holding section to the holding state; a brake linkage section configured to operate the holding section to the release state in response to the brake pedal being depressed in the holding state; and an output linkage section configured to operate the holding section to the release state in response to the output pedal being depressed in the holding state; wherein the manual operating tool is located higher than the output pedal, wherein the output linkage section comprises an operating member disposed above the output pedal at a height between the manual operating tool and the output pedal, and linked to the output pedal so as to operate in conjunction with the output pedal being depressed and then being returned, wherein the holding section enters the holding state due to being engaged with the operating member and holding the operating member, and enters the release state due to being separated from the operating member, wherein the operating member is supported in such a manner as to swing in a first direction about a first axis in conjunction with the output pedal being depressed, and to swing in a second direction opposite to the first direction about the first axis in conjunction with the output pedal being returned, wherein the operating member comprises: a plurality of first receiving sections along a radial direction of the first axis; and a plurality of first inclined sections facing in both the first direction and a direction approaching the first axis, from an outer edge section of the first receiving sections in the radial direction of the first axis, wherein the holding section is supported in such a manner as to be swingable about a second axis parallel to the first axis, wherein the holding section comprises: a second receiving section along a radial direction of the second axis; and a second inclined section facing in both the second direction and a direction approaching the second axis, from an outer edge section of the second receiving section in the radial direction of the second axis, wherein the holding section enters the holding state as a result of being engaged with the operating member to bring one of the first receiving sections into contact with the second receiving section so that the return of the output pedal by the biasing member is stopped and that the operating member is held, and wherein in response to the output pedal in the holding state being depressed, the holding section enters the release state as a result of the swing of the operating member in the first direction pressing one of the first inclined sections against the second inclined section so that the holding section is separated from the operating member.
8. 8 . A work vehicle comprising: an output pedal configured to control an output of a motive section; a biasing member configured to bias the output pedal to return; a brake pedal configured to operate a travel brake to a braking state; a holding section operable to a holding state of holding the output pedal at any depressed position and to a release state of releasing the holding of the output pedal and being maintained in the release state when depressed operation of the output pedal is stopped; a manual operating tool for manually operating the holding section to the holding state; a brake linkage section configured to operate the holding section to the release state in response to the brake pedal being depressed in the holding state; a support member configured to support the output pedal in such a manner that the output pedal is depressable and returnable; an output linkage section configured to operate the holding section to the release state in response to the output pedal being depressed in the holding state; an upper link supported by the support member in such a manner as to be swingable up and down and extending rearward from the support member; and a lower link supported by the support member in such a manner as to be swingable up and down and extending rearward from the support member, wherein the manual operating tool is located higher than the output pedal, wherein the output linkage section comprises an operating member disposed above the output pedal at a height between the manual operating tool and the output pedal, and linked to the output pedal so as to operate in conjunction with the output pedal being depressed and then being returned, wherein the holding section enters the holding state due to being engaged with the operating member and holding the operating member, and enters the release state due to being separated from the operating member, wherein the manual operating tool is spaced away from the output pedal in a left-right direction, wherein the work vehicle further comprises a linkage member connected to the manual operating tool and the holding section and configured to transmit operation of the manual operating tool to the holding section such that the holding section is operated to the holding state, wherein the brake linkage section is configured such that the holding section is separated from the operating member by the brake pedal in response to the brake pedal being depressed in the holding state, wherein the biasing member is connected to the output pedal and the support member, and wherein the output pedal is connected to a rear section of the upper link and a rear section of the lower link.

Description

CROSS REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2022-064614 filed on Apr. 8, 2022, the disclosure of which is hereby incorporated by reference in its entirety. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the configuration of a transmission operation system in a work vehicle. 2. Description of the Related Art There are work vehicles in which the motive power of the engine (corresponds to motive section) is transmitted to front wheels and rear wheels via a belt-type stepless transmission, as disclosed in Patent Document 1 (JP 2012-51507A). In Patent Document 1, the driver controls the output of the engine by depressing an accelerator pedal (corresponds to output pedal) that operates an accelerator section of the engine. The stepless transmission is operated to increase speed in response to the accelerator pedal being depressed and the engine revolutions increasing, and the stepless transmission is operated to reduce speed in response to the accelerator pedal being returned and the engine revolutions decreasing. In the case of a work vehicle that sprays herbicides, snow melting agent or the like, for example, the work vehicle needs to travel at a constant speed. In this case, with the work vehicle of Patent Document 1, the driver is required to keep the accelerator pedal depressed such that the work vehicle is maintained at a desired speed, thus leaving room for improvement. SUMMARY OF THE INVENTION An object of the present invention is to enable a work vehicle in which an output pedal is used to control the output of a motive section such as an engine or an electric motor to easily maintain a desired travel speed. A work vehicle of the present invention includes an output pedal configured to control an output of a motive section, a biasing member configured to bias the output pedal to return, a brake pedal configured to operate a travel brake to a braking state, a holding section operable to a holding state of holding the output pedal at any depressed position and to a release state of releasing the holding of the output pedal, a manual operating tool for manually operating the holding section to the holding state, a brake linkage section configured to operate the holding section to the release state in response to the brake pedal being depressed in the holding state, and an output linkage section configured to operate the holding section to the release state in response to the output pedal being depressed in the holding state. According to the present invention, the output (rotational speed) of the motive section increases due to the driver depressing the output pedal, and the output (rotational speed) of the motive section decreases due to the output pedal being returned by the biasing member in response to the driver taking his or her foot off the output pedal. The driver depresses the output pedal and when a desired travel speed is reached, the driver operates the holding section to a holding state by operating the manual operating tool to hold the output pedal. Because the output pedal is held at the desired position, even if the driver takes his or her foot off the output pedal, the work vehicle is maintained at the desired travel speed. The work vehicle can thereby be easily maintained at the desired travel speed, enabling the operability of the transmission operation system of the work vehicle to be improved. According to the present invention, in response to the driver depressing the brake pedal when the work vehicle is traveling with the output pedal held at the desired position, the holding section is released by the brake linkage section, and the output (revolutions) of the motive section decreases due to the output pedal being returned by the biasing member. The travel speed of the work vehicle can thereby be easily reduced (the work vehicle can be easily stopped), while maintaining the increased output (rotational speed) of the motive section, without needing to forcibly reduce the travel speed of the work vehicle (without needing to forcibly stop the work vehicle). According to the present invention, in response to the driver depressing the output pedal when the work vehicle is traveling with the output pedal held at the desired position, the holding section is released by the output linkage section, and the output pedal can be depressed (the output (revolutions) of the motive section can be increased), without interference from the holding section. As described above, the operability of the transmission operation system of the work vehicle can be improved when the work vehicle is traveling with the output pedal held at the desired position, due to the holding section being released by the brake pedal being depressed, and due to the holding section being released by the output pedal being depressed. In the present invention, it is preferable that the manual operating tool is located higher than